avr: 1wire.c annotate

annotate 1wire.c @ 67:52aa7716148c

Default to auto (EEPROM is fried so this is the only way..)

author	darius@Inchoate
date	Mon, 19 Jan 2009 22:51:53 +1030
parents	efd44dc40934
children

rev	line source
0 ffeab3c04e83 Initial revision darius parents: diff changeset	1 /*
ffeab3c04e83 Initial revision darius parents: diff changeset	2 * Various 1 wire routines
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	3 * Search routine is copied from the Dallas owpd library with mods
4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	4 * available from here http://www.ibutton.com/software/1wire/wirekit.html
0 ffeab3c04e83 Initial revision darius parents: diff changeset	5 *
8 f9a085a0ba93 Change the 1 wire routines to mostly C with assembly delay routines darius parents: 0 diff changeset	6 * $Id$
f9a085a0ba93 Change the 1 wire routines to mostly C with assembly delay routines darius parents: 0 diff changeset	7 *
0 ffeab3c04e83 Initial revision darius parents: diff changeset	8 * Copyright (c) 2004
ffeab3c04e83 Initial revision darius parents: diff changeset	9 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
ffeab3c04e83 Initial revision darius parents: diff changeset	10 *
ffeab3c04e83 Initial revision darius parents: diff changeset	11 * Redistribution and use in source and binary forms, with or without
ffeab3c04e83 Initial revision darius parents: diff changeset	12 * modification, are permitted provided that the following conditions
ffeab3c04e83 Initial revision darius parents: diff changeset	13 * are met:
ffeab3c04e83 Initial revision darius parents: diff changeset	14 * 1. Redistributions of source code must retain the above copyright
ffeab3c04e83 Initial revision darius parents: diff changeset	15 * notice, this list of conditions and the following disclaimer.
ffeab3c04e83 Initial revision darius parents: diff changeset	16 * 2. Redistributions in binary form must reproduce the above copyright
ffeab3c04e83 Initial revision darius parents: diff changeset	17 * notice, this list of conditions and the following disclaimer in the
ffeab3c04e83 Initial revision darius parents: diff changeset	18 * documentation and/or other materials provided with the distribution.
ffeab3c04e83 Initial revision darius parents: diff changeset	19 *
ffeab3c04e83 Initial revision darius parents: diff changeset	20 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
ffeab3c04e83 Initial revision darius parents: diff changeset	21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
ffeab3c04e83 Initial revision darius parents: diff changeset	22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
ffeab3c04e83 Initial revision darius parents: diff changeset	23 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
ffeab3c04e83 Initial revision darius parents: diff changeset	24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
ffeab3c04e83 Initial revision darius parents: diff changeset	25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
ffeab3c04e83 Initial revision darius parents: diff changeset	26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
ffeab3c04e83 Initial revision darius parents: diff changeset	27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
ffeab3c04e83 Initial revision darius parents: diff changeset	28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
ffeab3c04e83 Initial revision darius parents: diff changeset	29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
ffeab3c04e83 Initial revision darius parents: diff changeset	30 * SUCH DAMAGE.
ffeab3c04e83 Initial revision darius parents: diff changeset	31 */
ffeab3c04e83 Initial revision darius parents: diff changeset	32
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	33 /*
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	34 * No user servicable parts inside
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	35 *
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	36 * Modify 1wire-config.h
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	37 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	38
0 ffeab3c04e83 Initial revision darius parents: diff changeset	39 #include <stdio.h>
ffeab3c04e83 Initial revision darius parents: diff changeset	40 #include <avr/io.h>
ffeab3c04e83 Initial revision darius parents: diff changeset	41 #include <avr/pgmspace.h>
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	42 #include <util/delay.h>
0 ffeab3c04e83 Initial revision darius parents: diff changeset	43 #include "1wire.h"
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	44 #include "1wire-config.h"
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	45 #include "cons.h"
0 ffeab3c04e83 Initial revision darius parents: diff changeset	46
ffeab3c04e83 Initial revision darius parents: diff changeset	47 static uint8_t OW_LastDevice = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	48 static uint8_t OW_LastDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	49 static uint8_t OW_LastFamilyDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	50
45 efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	51 const PROGMEM char *OWProgROM_Status[] = {
efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	52 "OK",
efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	53 "not possible (no HW support)",
efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	54 "Invalid parameters",
efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	55 "module doesn't exist or didn't respond properly"
efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	56 };
efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	57
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	58 /*-----------------------------------------------------------------------------
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	59 * Configure the IO port as we need
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	60 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	61 void
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	62 OWInit(void) {
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	63 OWBUSINIT();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	64 OWSETBUSHIGH();
0 ffeab3c04e83 Initial revision darius parents: diff changeset	65 }
ffeab3c04e83 Initial revision darius parents: diff changeset	66
ffeab3c04e83 Initial revision darius parents: diff changeset	67 /*-----------------------------------------------------------------------------
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	68 * Generate a 1-Wire reset, return 0 if presence pulse was found, 1 if it
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	69 * wasn't, or 2 if the line appears to be being held low.
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	70 *
0 ffeab3c04e83 Initial revision darius parents: diff changeset	71 * (NOTE: Does not handle alarm presence from DS2404/DS1994)
ffeab3c04e83 Initial revision darius parents: diff changeset	72 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	73 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	74 OWTouchReset(void) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	75 OWDELAY_G;
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	76
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	77 /* Check the bus isn't being held low (ie it's broken) Do it after
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	78 * the delay so we guarantee we don't see a slave from a previous
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	79 * comms attempt
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	80 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	81 if(OWREADBUS() == 0)
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	82 return 2;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	83
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	84 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	85 OWDELAY_H;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	86 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	87 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	88
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	89 return(OWREADBUS());
0 ffeab3c04e83 Initial revision darius parents: diff changeset	90 }
ffeab3c04e83 Initial revision darius parents: diff changeset	91
ffeab3c04e83 Initial revision darius parents: diff changeset	92 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	93 * Send a 1-wire write bit.
ffeab3c04e83 Initial revision darius parents: diff changeset	94 */
ffeab3c04e83 Initial revision darius parents: diff changeset	95 void
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	96 OWWriteBit(uint8_t bit) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	97 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	98
0 ffeab3c04e83 Initial revision darius parents: diff changeset	99 if (bit) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	100 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	101 OWDELAY_A;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	102 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	103 OWDELAY_B;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	104 } else {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	105 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	106 OWDELAY_C;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	107 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	108 OWDELAY_D;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	109 }
ffeab3c04e83 Initial revision darius parents: diff changeset	110 }
ffeab3c04e83 Initial revision darius parents: diff changeset	111
ffeab3c04e83 Initial revision darius parents: diff changeset	112 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	113 * Read a bit from the 1-wire bus and return it.
ffeab3c04e83 Initial revision darius parents: diff changeset	114 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	115 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	116 OWReadBit(void) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	117 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	118
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	119 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	120 OWDELAY_A;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	121 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	122 OWDELAY_E;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	123 return(OWREADBUS());
0 ffeab3c04e83 Initial revision darius parents: diff changeset	124 }
ffeab3c04e83 Initial revision darius parents: diff changeset	125
ffeab3c04e83 Initial revision darius parents: diff changeset	126 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	127 * Write a byte to the 1-wire bus
ffeab3c04e83 Initial revision darius parents: diff changeset	128 */
ffeab3c04e83 Initial revision darius parents: diff changeset	129 void
ffeab3c04e83 Initial revision darius parents: diff changeset	130 OWWriteByte(uint8_t data) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	131 uint8_t i;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	132
ffeab3c04e83 Initial revision darius parents: diff changeset	133 /* Send LSB first */
ffeab3c04e83 Initial revision darius parents: diff changeset	134 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision darius parents: diff changeset	135 OWWriteBit(data & 0x01);
ffeab3c04e83 Initial revision darius parents: diff changeset	136 data >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	137 }
ffeab3c04e83 Initial revision darius parents: diff changeset	138 }
ffeab3c04e83 Initial revision darius parents: diff changeset	139
ffeab3c04e83 Initial revision darius parents: diff changeset	140 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	141 * Read a byte from the 1-wire bus
ffeab3c04e83 Initial revision darius parents: diff changeset	142 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	143 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	144 OWReadByte(void) {
ffeab3c04e83 Initial revision darius parents: diff changeset	145 int i, result = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	146
ffeab3c04e83 Initial revision darius parents: diff changeset	147 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision darius parents: diff changeset	148 result >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	149 if (OWReadBit())
ffeab3c04e83 Initial revision darius parents: diff changeset	150 result \|= 0x80;
ffeab3c04e83 Initial revision darius parents: diff changeset	151 }
ffeab3c04e83 Initial revision darius parents: diff changeset	152 return(result);
ffeab3c04e83 Initial revision darius parents: diff changeset	153 }
ffeab3c04e83 Initial revision darius parents: diff changeset	154
ffeab3c04e83 Initial revision darius parents: diff changeset	155 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	156 * Write a 1-wire data byte and return the sampled result.
ffeab3c04e83 Initial revision darius parents: diff changeset	157 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	158 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	159 OWTouchByte(uint8_t data) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	160 uint8_t i, result = 0;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	161
ffeab3c04e83 Initial revision darius parents: diff changeset	162 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision darius parents: diff changeset	163 result >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	164
ffeab3c04e83 Initial revision darius parents: diff changeset	165 /* If sending a 1 then read a bit, otherwise write a 0 */
ffeab3c04e83 Initial revision darius parents: diff changeset	166 if (data & 0x01) {
ffeab3c04e83 Initial revision darius parents: diff changeset	167 if (OWReadBit())
ffeab3c04e83 Initial revision darius parents: diff changeset	168 result \|= 0x80;
ffeab3c04e83 Initial revision darius parents: diff changeset	169 } else
ffeab3c04e83 Initial revision darius parents: diff changeset	170 OWWriteBit(0);
ffeab3c04e83 Initial revision darius parents: diff changeset	171
ffeab3c04e83 Initial revision darius parents: diff changeset	172 data >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	173 }
ffeab3c04e83 Initial revision darius parents: diff changeset	174
ffeab3c04e83 Initial revision darius parents: diff changeset	175 return(result);
ffeab3c04e83 Initial revision darius parents: diff changeset	176 }
ffeab3c04e83 Initial revision darius parents: diff changeset	177
ffeab3c04e83 Initial revision darius parents: diff changeset	178 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	179 * Write a block of bytes to the 1-wire bus and return the sampled result in
ffeab3c04e83 Initial revision darius parents: diff changeset	180 * the same buffer
ffeab3c04e83 Initial revision darius parents: diff changeset	181 */
ffeab3c04e83 Initial revision darius parents: diff changeset	182 void
ffeab3c04e83 Initial revision darius parents: diff changeset	183 OWBlock(uint8_t *data, int len) {
ffeab3c04e83 Initial revision darius parents: diff changeset	184 int i;
ffeab3c04e83 Initial revision darius parents: diff changeset	185
ffeab3c04e83 Initial revision darius parents: diff changeset	186 for (i = 0; i < len; i++)
ffeab3c04e83 Initial revision darius parents: diff changeset	187 data[i] = OWTouchByte(data[i]);
ffeab3c04e83 Initial revision darius parents: diff changeset	188 }
ffeab3c04e83 Initial revision darius parents: diff changeset	189
ffeab3c04e83 Initial revision darius parents: diff changeset	190
ffeab3c04e83 Initial revision darius parents: diff changeset	191 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	192 * Send a 1 wire command to a device, or all if no ROM ID provided
ffeab3c04e83 Initial revision darius parents: diff changeset	193 */
ffeab3c04e83 Initial revision darius parents: diff changeset	194 void
ffeab3c04e83 Initial revision darius parents: diff changeset	195 OWSendCmd(uint8_t *ROM, uint8_t cmd) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	196 uint8_t i;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	197
ffeab3c04e83 Initial revision darius parents: diff changeset	198 OWTouchReset();
ffeab3c04e83 Initial revision darius parents: diff changeset	199
ffeab3c04e83 Initial revision darius parents: diff changeset	200 if (ROM == NULL)
ffeab3c04e83 Initial revision darius parents: diff changeset	201 OWWriteByte(OW_SKIP_ROM_CMD);
ffeab3c04e83 Initial revision darius parents: diff changeset	202 else {
ffeab3c04e83 Initial revision darius parents: diff changeset	203 OWWriteByte(OW_MATCH_ROM_CMD);
ffeab3c04e83 Initial revision darius parents: diff changeset	204 for (i = 0; i < 8; i++)
ffeab3c04e83 Initial revision darius parents: diff changeset	205 OWWriteByte(ROM[i]);
ffeab3c04e83 Initial revision darius parents: diff changeset	206 }
ffeab3c04e83 Initial revision darius parents: diff changeset	207 OWWriteByte(cmd);
ffeab3c04e83 Initial revision darius parents: diff changeset	208 }
ffeab3c04e83 Initial revision darius parents: diff changeset	209
ffeab3c04e83 Initial revision darius parents: diff changeset	210 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	211 * Search algorithm from App note 187 (and 162)
ffeab3c04e83 Initial revision darius parents: diff changeset	212 *
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	213 * OWFirst/OWNext return..
eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	214 * 1 when something is found,
eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	215 * 0 no more modules
16 026dc24d85e0 Spell presence correctly. darius parents: 12 diff changeset	216 * -1 if no presence pulse,
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	217 * -2 if bad CRC,
eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	218 * -3 if bad wiring.
0 ffeab3c04e83 Initial revision darius parents: diff changeset	219 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	220 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	221 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
ffeab3c04e83 Initial revision darius parents: diff changeset	222 /* Reset state */
ffeab3c04e83 Initial revision darius parents: diff changeset	223 OW_LastDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	224 OW_LastDevice = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	225 OW_LastFamilyDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	226
ffeab3c04e83 Initial revision darius parents: diff changeset	227 /* Go looking */
ffeab3c04e83 Initial revision darius parents: diff changeset	228 return (OWNext(ROM, do_reset, alarm_only));
ffeab3c04e83 Initial revision darius parents: diff changeset	229 }
ffeab3c04e83 Initial revision darius parents: diff changeset	230
ffeab3c04e83 Initial revision darius parents: diff changeset	231 /* Returns 1 when something is found, 0 if nothing left */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	232 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	233 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
ffeab3c04e83 Initial revision darius parents: diff changeset	234 uint8_t bit_test, search_direction, bit_number;
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	235 uint8_t last_zero, rom_byte_number, rom_byte_mask;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	236 uint8_t lastcrc8, crcaccum;
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	237 int8_t next_result;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	238
ffeab3c04e83 Initial revision darius parents: diff changeset	239 /* Init for search */
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	240 bit_number = 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	241 last_zero = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	242 rom_byte_number = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	243 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	244 next_result = OW_NOMODULES;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	245 lastcrc8 = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	246 crcaccum = 0;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	247
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	248 /* if the last call was not the last one */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	249 if (!OW_LastDevice) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	250 /* check if reset first is requested */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	251 if (do_reset) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	252 /* reset the 1-wire
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	253 * if there are no parts on 1-wire, return 0 */
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	254 OWPUTSP(PSTR("Resetting\r\n"));
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	255 switch (OWTouchReset()) {
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	256 case 0:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	257 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	258
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	259 case 1:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	260 /* reset the search */
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	261 OW_LastDiscrepancy = 0;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	262 OW_LastFamilyDiscrepancy = 0;
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	263 OWPUTSP(PSTR("No devices on bus\r\n"));
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	264 return OW_NOPRESENCE;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	265 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	266
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	267 case 2:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	268 /* reset the search */
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	269 OW_LastDiscrepancy = 0;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	270 OW_LastFamilyDiscrepancy = 0;
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	271 OWPUTSP(PSTR("Bus appears to be being held low\r\n"));
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	272 return OW_BADWIRE;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	273 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	274
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	275 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	276 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	277
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	278 /* If finding alarming devices issue a different command */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	279 if (alarm_only)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	280 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	281 else
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	282 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */
0 ffeab3c04e83 Initial revision darius parents: diff changeset	283
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	284 /* pause before beginning the search */
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	285 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	286 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	287 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	288
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	289 /* loop to do the search */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	290 do {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	291 /* read a bit and its compliment */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	292 bit_test = OWReadBit() << 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	293 bit_test \|= OWReadBit();
0 ffeab3c04e83 Initial revision darius parents: diff changeset	294
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	295 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	296
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	297 /* check for no devices on 1-wire */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	298 if (bit_test == 3) {
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	299 OWPRINTFP(PSTR("bit_test = %d\r\n"), bit_test);
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	300 return(OW_BADWIRE);
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	301 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	302 else {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	303 /* all devices coupled have 0 or 1 */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	304 if (bit_test > 0)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	305 search_direction = !(bit_test & 0x01); /* bit write value for search */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	306 else {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	307 /* if this discrepancy is before the Last Discrepancy
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	308 * on a previous OWNext then pick the same as last time */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	309 if (bit_number < OW_LastDiscrepancy)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	310 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	311 else
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	312 /* if equal to last pick 1, if not then pick 0 */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	313 search_direction = (bit_number == OW_LastDiscrepancy);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	314
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	315 /* if 0 was picked then record its position in LastZero */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	316 if (search_direction == 0) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	317 last_zero = bit_number;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	318
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	319 /* check for Last discrepancy in family */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	320 if (last_zero < 9)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	321 OW_LastFamilyDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	322 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	323 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	324
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	325 /* set or clear the bit in the ROM byte rom_byte_number
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	326 * with mask rom_byte_mask */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	327 if (search_direction == 1)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	328 ROM[rom_byte_number] \|= rom_byte_mask;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	329 else
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	330 ROM[rom_byte_number] &= ~rom_byte_mask;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	331
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	332 /* serial number search direction write bit */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	333 OWWriteBit(search_direction);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	334
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	335 /* increment the byte counter bit_number
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	336 * and shift the mask rom_byte_mask */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	337 bit_number++;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	338 rom_byte_mask <<= 1;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	339
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	340 /* if the mask is 0 then go to new ROM byte rom_byte_number
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	341 * and reset mask */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	342 if (rom_byte_mask == 0) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	343 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	344 lastcrc8 = crcaccum;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	345
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	346 rom_byte_number++;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	347 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	348 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	349 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	350 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */
0 ffeab3c04e83 Initial revision darius parents: diff changeset	351
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	352 /* if the search was successful then */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	353 if (!(bit_number < 65) \|\| lastcrc8) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	354 if (lastcrc8) {
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	355 OWPRINTFP(PSTR("Bad CRC (%d)\r\n"), lastcrc8);
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	356 next_result = OW_BADCRC;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	357 } else {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	358 /* search successful so set LastDiscrepancy,LastDevice,next_result */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	359 OW_LastDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	360 OW_LastDevice = (OW_LastDiscrepancy == 0);
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	361 OWPRINTFP(PSTR("Last device = %d\r\n"), OW_LastDevice);
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	362 next_result = OW_FOUND;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	363 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	364 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	365 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	366
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	367 /* if no device found then reset counters so next 'next' will be
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	368 * like a first */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	369 if (next_result != OW_FOUND \|\| ROM[0] == 0) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	370 OW_LastDiscrepancy = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	371 OW_LastDevice = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	372 OW_LastFamilyDiscrepancy = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	373 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	374
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	375 if (next_result == OW_FOUND && ROM[0] == 0x00)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	376 next_result = OW_BADWIRE;
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	377
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	378 return next_result;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	379
ffeab3c04e83 Initial revision darius parents: diff changeset	380 }
ffeab3c04e83 Initial revision darius parents: diff changeset	381
ffeab3c04e83 Initial revision darius parents: diff changeset	382 uint8_t PROGMEM dscrc_table[] = {
ffeab3c04e83 Initial revision darius parents: diff changeset	383 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
ffeab3c04e83 Initial revision darius parents: diff changeset	384 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
ffeab3c04e83 Initial revision darius parents: diff changeset	385 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
ffeab3c04e83 Initial revision darius parents: diff changeset	386 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
ffeab3c04e83 Initial revision darius parents: diff changeset	387 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
ffeab3c04e83 Initial revision darius parents: diff changeset	388 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
ffeab3c04e83 Initial revision darius parents: diff changeset	389 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
ffeab3c04e83 Initial revision darius parents: diff changeset	390 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
ffeab3c04e83 Initial revision darius parents: diff changeset	391 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
ffeab3c04e83 Initial revision darius parents: diff changeset	392 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
ffeab3c04e83 Initial revision darius parents: diff changeset	393 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
ffeab3c04e83 Initial revision darius parents: diff changeset	394 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
ffeab3c04e83 Initial revision darius parents: diff changeset	395 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
ffeab3c04e83 Initial revision darius parents: diff changeset	396 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
ffeab3c04e83 Initial revision darius parents: diff changeset	397 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
ffeab3c04e83 Initial revision darius parents: diff changeset	398 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
ffeab3c04e83 Initial revision darius parents: diff changeset	399 };
ffeab3c04e83 Initial revision darius parents: diff changeset	400
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	401 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	402 * Update *crc based on the value of x
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	403 */
0 ffeab3c04e83 Initial revision darius parents: diff changeset	404 void
ffeab3c04e83 Initial revision darius parents: diff changeset	405 OWCRC(uint8_t x, uint8_t *crc) {
ffeab3c04e83 Initial revision darius parents: diff changeset	406 crc = pgm_read_byte(&dscrc_table[(crc) ^ x]);
ffeab3c04e83 Initial revision darius parents: diff changeset	407 }
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	408
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	409 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	410 * Program a DS2502's memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	411 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	412 * Arguments
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	413 * ROM - ROM ID (or NULL to send SKIP_ROM)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	414 * start - Start address (bytes)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	415 * len - Length of data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	416 * data - Data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	417 * exact - If true, only accept exact matches for programming,
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	418 * otherwise only ensure the bits we requested were
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	419 * programmed [to 0]
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	420 * status - If true program status rather than memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	421 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	422 * Returns..
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	423 * 0 if all is OK
45 efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	424 * 1 if the programming is not possible
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	425 * 2 if the parameters were invalid
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	426 * 3 if the DS2502 didn't respond appropriately (also happens if the
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	427 * module doesn't exist)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	428 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	429 uint8_t
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	430 OWProgROM(uint8_t ROM, uint8_t start, uint8_t len, uint8_t data, uint8_t exact, uint8_t status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	431 #if defined(OWSETVPPON) && defined(OWSETVPPOFF)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	432 uint8_t crc, i, tmp;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	433
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	434 /* Stupid programmer detection */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	435 if (status) {
45 efd44dc40934 Add macros for number system used for temperatures. darius@Inchoate parents: 41 diff changeset	436 if (start + len > 3)
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	437 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	438 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	439 if (start + len > 127)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	440 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	441 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	442
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	443 if (len < 1)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	444 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	445
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	446 OWDELAY_I;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	447 if (OWTouchReset() != 0) {
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	448 cons_putsP(PSTR("No presence pulse\r\n"));
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	449 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	450 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	451
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	452 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	453
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	454 /* Send the command */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	455 if (status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	456 OWSendCmd(ROM, OW_WRITE_STATUS);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	457 OWCRC(OW_WRITE_STATUS, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	458 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	459 OWSendCmd(ROM, OW_WRITE_MEMORY);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	460 OWCRC(OW_WRITE_MEMORY, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	461 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	462
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	463 /* And the start address
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	464 * (2 bytes even though one would do)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	465 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	466 OWWriteByte(start);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	467 OWCRC(start, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	468
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	469 OWWriteByte(0x00);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	470 OWCRC(0x00, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	471
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	472 for (i = 0; i < len; i++) {
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	473 cons_putsP(PSTR("Programming "));
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	474 cons_puts_hex(data[i]);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	475 cons_putsP(PSTR(" to "));
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	476 cons_puts_hex(start + i);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	477 cons_putsP(PSTR("\r\n"));
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	478
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	479 OWWriteByte(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	480 OWCRC(data[i], &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	481
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	482 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	483
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	484 if (crc != tmp) {
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	485 cons_putsP(PSTR("CRC mismatch "));
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	486 cons_puts_hex(crc);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	487 cons_putsP(PSTR(" vs "));
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	488 cons_puts_hex(tmp);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	489 cons_putsP(PSTR("\r\n"));
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	490
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	491 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	492 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	493 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	494
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	495 OWSETVPPON();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	496 OWDELAY_H;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	497 OWSETVPPOFF();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	498
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	499 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	500
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	501 /* Check the bits we turned off are off */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	502 /*
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	503 for (i = 0; i < 8; i++)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	504 if (!(data[i] & 1 << i) && (tmp & 1 << i))
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	505 return(-3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	506 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	507 if ((!data[i] & tmp) != 0) {
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	508 cons_putsP(PSTR("Readback mismatch "));
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	509 cons_puts_hex(data[i]);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	510 cons_putsP(PSTR(" vs "));
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	511 cons_puts_hex(data[i]);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	512 cons_putsP(PSTR("\r\n"));
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	513
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	514 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	515 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	516 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	517
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	518 /* The DS2502 loads it's CRC register with the address of the
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	519 * next byte */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	520 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	521 OWCRC(start + i + 1, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	522 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	523
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	524 return(0);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	525 #else
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	526 return(1);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	527 #endif
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	528 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	529
41 5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	530 /*
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	531 * OWGetTemp
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	532 *
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	533 * Get the temperature from a 1wire bus module
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	534 *
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	535 * Returns temperature in hundredths of a degree or OW_TEMP_xxx on
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	536 * error.
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	537 */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	538 int16_t
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	539 OWGetTemp(uint8_t *ROM) {
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	540 int8_t i;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	541 uint8_t crc, buf[9];
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	542 int16_t temp;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	543 int16_t tfrac;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	544
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	545 if (ROM[0] != OW_FAMILY_TEMP)
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	546 return OW_TEMP_WRONG_FAM;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	547
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	548 OWSendCmd(ROM, OW_CONVERTT_CMD);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	549
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	550 i = 0;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	551
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	552 /* Wait for the conversion */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	553 while (OWReadBit() == 0)
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	554 i = 1;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	555
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	556 /* Check that we talked to a module and it did something */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	557 if (i == 0) {
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	558 return OW_TEMP_NO_ROM;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	559 }
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	560
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	561 OWSendCmd(ROM, OW_RD_SCR_CMD);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	562 crc = 0;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	563 for (i = 0; i < 8; i++) {
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	564 buf[i] = OWReadByte();
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	565 OWCRC(buf[i], &crc);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	566 }
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	567 buf[i] = OWReadByte();
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	568 if (crc != buf[8])
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	569 return OW_TEMP_CRC_ERR;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	570 temp = buf[0];
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	571 if (buf[1] & 0x80)
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	572 temp -= 256;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	573
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	574 /* Chop off 0.5 degree bit */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	575 temp >>= 1;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	576
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	577 /* Calulate the fractional remainder */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	578 tfrac = buf[7] - buf[6];
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	579
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	580 /* Work in 100'th of degreess to save on floats */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	581 tfrac *= (int16_t)100;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	582
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	583 /* Divide by count */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	584 tfrac /= buf[7];
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	585
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	586 /* Subtract 0.25 deg from temp */
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	587 tfrac += 75;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	588 if (tfrac < 100)
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	589 temp--;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	590 else
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	591 tfrac -= 100;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	592
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	593 i = temp;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	594 temp *= 100;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	595 temp += tfrac;
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	596
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	597 return(temp);
5898fba6593c Add temperature control. darius@inchoate.localdomain parents: 33 diff changeset	598 }

Mercurial > ~darius > hgwebdir.cgi > avr

annotate 1wire.c @ 67:52aa7716148c