tempctrl: 1wire.c annotate

annotate 1wire.c @ 44:f219538d6ea7

Fix typo.

author	darius@inchoate.localdomain
date	Sun, 06 Jul 2008 22:42:42 +0930
parents	5898fba6593c
children	efd44dc40934

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

Mercurial > ~darius > hgwebdir.cgi > tempctrl

annotate 1wire.c @ 44:f219538d6ea7