avr: 1wire.c annotate

annotate 1wire.c @ 35:fed32b382de2

Tidy up, hide details behind macros to make it more obvious what we talk to do do things. Convert constants to my preferred format.

author	darius
date	Tue, 23 Oct 2007 10:54:01 +0930
parents	0aa6bf4b98ae
children	5898fba6593c

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"
0 ffeab3c04e83 Initial revision darius parents: diff changeset	45
ffeab3c04e83 Initial revision darius parents: diff changeset	46 static uint8_t OW_LastDevice = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	47 static uint8_t OW_LastDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	48 static uint8_t OW_LastFamilyDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	49
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	50 /*-----------------------------------------------------------------------------
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	51 * 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	52 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	53 void
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	54 OWInit(void) {
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	55 OWBUSINIT();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	56 OWSETBUSHIGH();
0 ffeab3c04e83 Initial revision darius parents: diff changeset	57 }
ffeab3c04e83 Initial revision darius parents: diff changeset	58
ffeab3c04e83 Initial revision darius parents: diff changeset	59 /*-----------------------------------------------------------------------------
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	60 * 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	61 * 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	62 *
0 ffeab3c04e83 Initial revision darius parents: diff changeset	63 * (NOTE: Does not handle alarm presence from DS2404/DS1994)
ffeab3c04e83 Initial revision darius parents: diff changeset	64 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	65 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	66 OWTouchReset(void) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	67 OWDELAY_G;
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	68
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	69 /* 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	70 * 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	71 * comms attempt
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	72 */
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	73 if(OWREADBUS() == 0)
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	74 return 2;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	75
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	76 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	77 OWDELAY_H;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	78 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	79 OWDELAY_I;
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 return(OWREADBUS());
0 ffeab3c04e83 Initial revision darius parents: diff changeset	82 }
ffeab3c04e83 Initial revision darius parents: diff changeset	83
ffeab3c04e83 Initial revision darius parents: diff changeset	84 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	85 * Send a 1-wire write bit.
ffeab3c04e83 Initial revision darius parents: diff changeset	86 */
ffeab3c04e83 Initial revision darius parents: diff changeset	87 void
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	88 OWWriteBit(uint8_t bit) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	89 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	90
0 ffeab3c04e83 Initial revision darius parents: diff changeset	91 if (bit) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	92 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	93 OWDELAY_A;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	94 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	95 OWDELAY_B;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	96 } else {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	97 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	98 OWDELAY_C;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	99 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	100 OWDELAY_D;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	101 }
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 * Read a bit from the 1-wire bus and return it.
ffeab3c04e83 Initial revision darius parents: diff changeset	106 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	107 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	108 OWReadBit(void) {
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	109 OWDELAY_I;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	110
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	111 OWSETBUSLOW();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	112 OWDELAY_A;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	113 OWSETBUSHIGH();
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	114 OWDELAY_E;
b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	115 return(OWREADBUS());
0 ffeab3c04e83 Initial revision darius parents: diff changeset	116 }
ffeab3c04e83 Initial revision darius parents: diff changeset	117
ffeab3c04e83 Initial revision darius parents: diff changeset	118 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	119 * Write a byte to the 1-wire bus
ffeab3c04e83 Initial revision darius parents: diff changeset	120 */
ffeab3c04e83 Initial revision darius parents: diff changeset	121 void
ffeab3c04e83 Initial revision darius parents: diff changeset	122 OWWriteByte(uint8_t data) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	123 uint8_t i;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	124
ffeab3c04e83 Initial revision darius parents: diff changeset	125 /* Send LSB first */
ffeab3c04e83 Initial revision darius parents: diff changeset	126 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision darius parents: diff changeset	127 OWWriteBit(data & 0x01);
ffeab3c04e83 Initial revision darius parents: diff changeset	128 data >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	129 }
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 * Read a byte from the 1-wire bus
ffeab3c04e83 Initial revision darius parents: diff changeset	134 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	135 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	136 OWReadByte(void) {
ffeab3c04e83 Initial revision darius parents: diff changeset	137 int i, result = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	138
ffeab3c04e83 Initial revision darius parents: diff changeset	139 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision darius parents: diff changeset	140 result >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	141 if (OWReadBit())
ffeab3c04e83 Initial revision darius parents: diff changeset	142 result \|= 0x80;
ffeab3c04e83 Initial revision darius parents: diff changeset	143 }
ffeab3c04e83 Initial revision darius parents: diff changeset	144 return(result);
ffeab3c04e83 Initial revision darius parents: diff changeset	145 }
ffeab3c04e83 Initial revision darius parents: diff changeset	146
ffeab3c04e83 Initial revision darius parents: diff changeset	147 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	148 * Write a 1-wire data byte and return the sampled result.
ffeab3c04e83 Initial revision darius parents: diff changeset	149 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	150 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	151 OWTouchByte(uint8_t data) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	152 uint8_t i, result = 0;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	153
ffeab3c04e83 Initial revision darius parents: diff changeset	154 for (i = 0; i < 8; i++) {
ffeab3c04e83 Initial revision darius parents: diff changeset	155 result >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	156
ffeab3c04e83 Initial revision darius parents: diff changeset	157 /* If sending a 1 then read a bit, otherwise write a 0 */
ffeab3c04e83 Initial revision darius parents: diff changeset	158 if (data & 0x01) {
ffeab3c04e83 Initial revision darius parents: diff changeset	159 if (OWReadBit())
ffeab3c04e83 Initial revision darius parents: diff changeset	160 result \|= 0x80;
ffeab3c04e83 Initial revision darius parents: diff changeset	161 } else
ffeab3c04e83 Initial revision darius parents: diff changeset	162 OWWriteBit(0);
ffeab3c04e83 Initial revision darius parents: diff changeset	163
ffeab3c04e83 Initial revision darius parents: diff changeset	164 data >>= 1;
ffeab3c04e83 Initial revision darius parents: diff changeset	165 }
ffeab3c04e83 Initial revision darius parents: diff changeset	166
ffeab3c04e83 Initial revision darius parents: diff changeset	167 return(result);
ffeab3c04e83 Initial revision darius parents: diff changeset	168 }
ffeab3c04e83 Initial revision darius parents: diff changeset	169
ffeab3c04e83 Initial revision darius parents: diff changeset	170 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	171 * Write a block of bytes to the 1-wire bus and return the sampled result in
ffeab3c04e83 Initial revision darius parents: diff changeset	172 * the same buffer
ffeab3c04e83 Initial revision darius parents: diff changeset	173 */
ffeab3c04e83 Initial revision darius parents: diff changeset	174 void
ffeab3c04e83 Initial revision darius parents: diff changeset	175 OWBlock(uint8_t *data, int len) {
ffeab3c04e83 Initial revision darius parents: diff changeset	176 int i;
ffeab3c04e83 Initial revision darius parents: diff changeset	177
ffeab3c04e83 Initial revision darius parents: diff changeset	178 for (i = 0; i < len; i++)
ffeab3c04e83 Initial revision darius parents: diff changeset	179 data[i] = OWTouchByte(data[i]);
ffeab3c04e83 Initial revision darius parents: diff changeset	180 }
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 * Send a 1 wire command to a device, or all if no ROM ID provided
ffeab3c04e83 Initial revision darius parents: diff changeset	185 */
ffeab3c04e83 Initial revision darius parents: diff changeset	186 void
ffeab3c04e83 Initial revision darius parents: diff changeset	187 OWSendCmd(uint8_t *ROM, uint8_t cmd) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	188 uint8_t i;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	189
ffeab3c04e83 Initial revision darius parents: diff changeset	190 OWTouchReset();
ffeab3c04e83 Initial revision darius parents: diff changeset	191
ffeab3c04e83 Initial revision darius parents: diff changeset	192 if (ROM == NULL)
ffeab3c04e83 Initial revision darius parents: diff changeset	193 OWWriteByte(OW_SKIP_ROM_CMD);
ffeab3c04e83 Initial revision darius parents: diff changeset	194 else {
ffeab3c04e83 Initial revision darius parents: diff changeset	195 OWWriteByte(OW_MATCH_ROM_CMD);
ffeab3c04e83 Initial revision darius parents: diff changeset	196 for (i = 0; i < 8; i++)
ffeab3c04e83 Initial revision darius parents: diff changeset	197 OWWriteByte(ROM[i]);
ffeab3c04e83 Initial revision darius parents: diff changeset	198 }
ffeab3c04e83 Initial revision darius parents: diff changeset	199 OWWriteByte(cmd);
ffeab3c04e83 Initial revision darius parents: diff changeset	200 }
ffeab3c04e83 Initial revision darius parents: diff changeset	201
ffeab3c04e83 Initial revision darius parents: diff changeset	202 /*-----------------------------------------------------------------------------
ffeab3c04e83 Initial revision darius parents: diff changeset	203 * Search algorithm from App note 187 (and 162)
ffeab3c04e83 Initial revision darius parents: diff changeset	204 *
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	205 * OWFirst/OWNext return..
eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	206 * 1 when something is found,
eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	207 * 0 no more modules
16 026dc24d85e0 Spell presence correctly. darius parents: 12 diff changeset	208 * -1 if no presence pulse,
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	209 * -2 if bad CRC,
eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	210 * -3 if bad wiring.
0 ffeab3c04e83 Initial revision darius parents: diff changeset	211 */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	212 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	213 OWFirst(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
ffeab3c04e83 Initial revision darius parents: diff changeset	214 /* Reset state */
ffeab3c04e83 Initial revision darius parents: diff changeset	215 OW_LastDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	216 OW_LastDevice = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	217 OW_LastFamilyDiscrepancy = 0;
ffeab3c04e83 Initial revision darius parents: diff changeset	218
ffeab3c04e83 Initial revision darius parents: diff changeset	219 /* Go looking */
ffeab3c04e83 Initial revision darius parents: diff changeset	220 return (OWNext(ROM, do_reset, alarm_only));
ffeab3c04e83 Initial revision darius parents: diff changeset	221 }
ffeab3c04e83 Initial revision darius parents: diff changeset	222
ffeab3c04e83 Initial revision darius parents: diff changeset	223 /* Returns 1 when something is found, 0 if nothing left */
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	224 uint8_t
0 ffeab3c04e83 Initial revision darius parents: diff changeset	225 OWNext(uint8_t *ROM, uint8_t do_reset, uint8_t alarm_only) {
ffeab3c04e83 Initial revision darius parents: diff changeset	226 uint8_t bit_test, search_direction, bit_number;
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	227 uint8_t last_zero, rom_byte_number, rom_byte_mask;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	228 uint8_t lastcrc8, crcaccum;
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	229 int8_t next_result;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	230
ffeab3c04e83 Initial revision darius parents: diff changeset	231 /* Init for search */
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	232 bit_number = 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	233 last_zero = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	234 rom_byte_number = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	235 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	236 next_result = OW_NOMODULES;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	237 lastcrc8 = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	238 crcaccum = 0;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	239
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	240 /* if the last call was not the last one */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	241 if (!OW_LastDevice) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	242 /* check if reset first is requested */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	243 if (do_reset) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	244 /* reset the 1-wire
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	245 * if there are no parts on 1-wire, return 0 */
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	246 OWPUTSP(PSTR("Resetting\n\r"));
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	247 switch (OWTouchReset()) {
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	248 case 0:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	249 break;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	250
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	251 case 1:
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	252 /* reset the search */
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	253 OW_LastDiscrepancy = 0;
bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	254 OW_LastFamilyDiscrepancy = 0;
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	255 OWPUTSP(PSTR("No devices on bus\n\r"));
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	256 return OW_NOPRESENCE;
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 2:
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;
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	263 OWPUTSP(PSTR("Bus appears to be being held low\n\r"));
22 bd792ebf813d Report the bus being held low back to the caller from OWFirst/Next. darius parents: 21 diff changeset	264 return OW_BADWIRE;
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
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	267 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	268 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	269
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	270 /* If finding alarming devices issue a different command */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	271 if (alarm_only)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	272 OWWriteByte(OW_SEARCH_ALRM_CMD); /* issue the alarming search command */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	273 else
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	274 OWWriteByte(OW_SEARCH_ROM_CMD); /* issue the search command */
0 ffeab3c04e83 Initial revision darius parents: diff changeset	275
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	276 /* pause before beginning the search */
32 b0cb873c0206 Isolate the bus frobbing parts and the delays into a separate header. darius parents: 29 diff changeset	277 OWDELAY_I;
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
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	281 /* loop to do the search */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	282 do {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	283 /* read a bit and its compliment */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	284 bit_test = OWReadBit() << 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	285 bit_test \|= OWReadBit();
0 ffeab3c04e83 Initial revision darius parents: diff changeset	286
ffeab3c04e83 Initial revision darius parents: diff changeset	287 #if OW_DEBUG
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	288 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	289 OWPUTSP(errstr);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	290 #endif
ffeab3c04e83 Initial revision darius parents: diff changeset	291
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	292 /* check for no devices on 1-wire */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	293 if (bit_test == 3) {
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	294 #if OW_DEBUG
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	295 sprintf_P(errstr, PSTR("bit_test = %d\n\r"), bit_test);
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	296 OWPUTSP(errstr);
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	297 #endif
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	298 return(OW_BADWIRE);
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	299 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	300 else {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	301 /* all devices coupled have 0 or 1 */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	302 if (bit_test > 0)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	303 search_direction = !(bit_test & 0x01); /* bit write value for search */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	304 else {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	305 /* if this discrepancy is before the Last Discrepancy
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	306 * on a previous OWNext then pick the same as last time */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	307 if (bit_number < OW_LastDiscrepancy)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	308 search_direction = ((ROM[rom_byte_number] & rom_byte_mask) > 0);
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	309 else
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	310 /* if equal to last pick 1, if not then pick 0 */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	311 search_direction = (bit_number == OW_LastDiscrepancy);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	312
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	313 /* if 0 was picked then record its position in LastZero */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	314 if (search_direction == 0) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	315 last_zero = bit_number;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	316
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	317 /* check for Last discrepancy in family */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	318 if (last_zero < 9)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	319 OW_LastFamilyDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	320 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	321 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	322
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	323 /* set or clear the bit in the ROM byte rom_byte_number
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	324 * with mask rom_byte_mask */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	325 if (search_direction == 1)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	326 ROM[rom_byte_number] \|= rom_byte_mask;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	327 else
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	328 ROM[rom_byte_number] &= ~rom_byte_mask;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	329
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	330 /* serial number search direction write bit */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	331 OWWriteBit(search_direction);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	332
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	333 /* increment the byte counter bit_number
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	334 * and shift the mask rom_byte_mask */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	335 bit_number++;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	336 rom_byte_mask <<= 1;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	337
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	338 /* if the mask is 0 then go to new ROM byte rom_byte_number
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	339 * and reset mask */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	340 if (rom_byte_mask == 0) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	341 OWCRC(ROM[rom_byte_number], &crcaccum); /* accumulate the CRC */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	342 lastcrc8 = crcaccum;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	343
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	344 rom_byte_number++;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	345 rom_byte_mask = 1;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	346 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	347 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	348 } while (rom_byte_number < 8); /* loop until through all ROM bytes 0-7 */
0 ffeab3c04e83 Initial revision darius parents: diff changeset	349
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	350 /* if the search was successful then */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	351 if (!(bit_number < 65) \|\| lastcrc8) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	352 if (lastcrc8) {
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	353 #if OW_DEBUG
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	354 sprintf_P(errstr, PSTR("Bad CRC (%d)\n\r"), lastcrc8);
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	355 OWPUTSP(errstr);
12 4b141cc7cbd4 - Reduce type widths where possible. darius parents: 10 diff changeset	356 #endif
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	357 next_result = OW_BADCRC;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	358 } else {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	359 /* search successful so set LastDiscrepancy,LastDevice,next_result */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	360 OW_LastDiscrepancy = last_zero;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	361 OW_LastDevice = (OW_LastDiscrepancy == 0);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	362 #if OW_DEBUG
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	363 sprintf_P(errstr, PSTR("Last device = %d\n\r"), OW_LastDevice);
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	364 OWPUTSP(errstr);
0 ffeab3c04e83 Initial revision darius parents: diff changeset	365 #endif
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	366 next_result = OW_FOUND;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	367 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	368 }
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	369 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	370
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	371 /* if no device found then reset counters so next 'next' will be
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	372 * like a first */
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	373 if (next_result != OW_FOUND \|\| ROM[0] == 0) {
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	374 OW_LastDiscrepancy = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	375 OW_LastDevice = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	376 OW_LastFamilyDiscrepancy = 0;
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	377 }
0 ffeab3c04e83 Initial revision darius parents: diff changeset	378
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	379 if (next_result == OW_FOUND && ROM[0] == 0x00)
e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	380 next_result = OW_BADWIRE;
10 eb1faf51968e - Add some useful return values to search functions. darius parents: 8 diff changeset	381
21 e82d15fa9a1a Re-format the code. darius parents: 16 diff changeset	382 return next_result;
0 ffeab3c04e83 Initial revision darius parents: diff changeset	383
ffeab3c04e83 Initial revision darius parents: diff changeset	384 }
ffeab3c04e83 Initial revision darius parents: diff changeset	385
ffeab3c04e83 Initial revision darius parents: diff changeset	386 uint8_t PROGMEM dscrc_table[] = {
ffeab3c04e83 Initial revision darius parents: diff changeset	387 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
ffeab3c04e83 Initial revision darius parents: diff changeset	388 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
ffeab3c04e83 Initial revision darius parents: diff changeset	389 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
ffeab3c04e83 Initial revision darius parents: diff changeset	390 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
ffeab3c04e83 Initial revision darius parents: diff changeset	391 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
ffeab3c04e83 Initial revision darius parents: diff changeset	392 219, 133,103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
ffeab3c04e83 Initial revision darius parents: diff changeset	393 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
ffeab3c04e83 Initial revision darius parents: diff changeset	394 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
ffeab3c04e83 Initial revision darius parents: diff changeset	395 140,210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113,147, 205,
ffeab3c04e83 Initial revision darius parents: diff changeset	396 17, 79, 173, 243, 112, 46, 204, 146, 211,141, 111, 49, 178, 236, 14, 80,
ffeab3c04e83 Initial revision darius parents: diff changeset	397 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82,176, 238,
ffeab3c04e83 Initial revision darius parents: diff changeset	398 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
ffeab3c04e83 Initial revision darius parents: diff changeset	399 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
ffeab3c04e83 Initial revision darius parents: diff changeset	400 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
ffeab3c04e83 Initial revision darius parents: diff changeset	401 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
ffeab3c04e83 Initial revision darius parents: diff changeset	402 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53
ffeab3c04e83 Initial revision darius parents: diff changeset	403 };
ffeab3c04e83 Initial revision darius parents: diff changeset	404
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	405 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	406 * 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	407 */
0 ffeab3c04e83 Initial revision darius parents: diff changeset	408 void
ffeab3c04e83 Initial revision darius parents: diff changeset	409 OWCRC(uint8_t x, uint8_t *crc) {
ffeab3c04e83 Initial revision darius parents: diff changeset	410 crc = pgm_read_byte(&dscrc_table[(crc) ^ x]);
ffeab3c04e83 Initial revision darius parents: diff changeset	411 }
33 0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	412
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	413 /*-----------------------------------------------------------------------------
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	414 * Program a DS2502's memory
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	415 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	416 * Arguments
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	417 * 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	418 * start - Start address (bytes)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	419 * len - Length of data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	420 * data - Data to write
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	421 * 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	422 * 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	423 * programmed [to 0]
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	424 * 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	425 *
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	426 * Returns..
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	427 * 0 if all is OK
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	428 * 1 if the programming was unsuccessful
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	429 * 2 if the parameters were invalid
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	430 * 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	431 * module doesn't exist)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	432 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	433 uint8_t
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	434 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	435 #if defined(OWSETVPPON) && defined(OWSETVPPOFF)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	436 uint8_t crc, i, tmp;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	437
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	438 /* Stupid programmer detection */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	439 if (status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	440 if (start + len > 3)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	441 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	442 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	443 if (start + len > 127)
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
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	447 if (len < 1)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	448 return(2);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	449
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	450 OWDELAY_I;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	451 if (OWTouchReset() != 0) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	452 uart_putsP(PSTR("No presence pulse\n\r"));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	453 return(3);
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 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	457
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	458 /* Send the command */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	459 if (status) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	460 OWSendCmd(ROM, OW_WRITE_STATUS);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	461 OWCRC(OW_WRITE_STATUS, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	462 } else {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	463 OWSendCmd(ROM, OW_WRITE_MEMORY);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	464 OWCRC(OW_WRITE_MEMORY, &crc);
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
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	467 /* And the start address
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	468 * (2 bytes even though one would do)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	469 */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	470 OWWriteByte(start);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	471 OWCRC(start, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	472
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	473 OWWriteByte(0x00);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	474 OWCRC(0x00, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	475
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	476 for (i = 0; i < len; i++) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	477 uart_putsP(PSTR("Programming "));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	478 uart_puts_hex(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	479 uart_putsP(PSTR(" to "));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	480 uart_puts_hex(start + i);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	481 uart_putsP(PSTR("\n\r"));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	482
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	483 OWWriteByte(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	484 OWCRC(data[i], &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	485
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	486 tmp = OWReadByte();
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 if (crc != tmp) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	489 uart_putsP(PSTR("CRC mismatch "));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	490 uart_puts_hex(crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	491 uart_putsP(PSTR(" vs "));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	492 uart_puts_hex(tmp);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	493 uart_putsP(PSTR("\n\r"));
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 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	496 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	497 }
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 OWSETVPPON();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	500 OWDELAY_H;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	501 OWSETVPPOFF();
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 tmp = OWReadByte();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	504
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	505 /* 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	506 /*
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	507 for (i = 0; i < 8; i++)
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	508 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	509 return(-3);
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 if ((!data[i] & tmp) != 0) {
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	512 uart_putsP(PSTR("Readback mismatch "));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	513 uart_puts_hex(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	514 uart_putsP(PSTR(" vs "));
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	515 uart_puts_hex(data[i]);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	516 uart_putsP(PSTR("\n\r"));
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 OWTouchReset();
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	519 return(3);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	520 }
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 /* 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	523 * next byte */
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	524 crc = 0;
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	525 OWCRC(start + i + 1, &crc);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	526 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	527
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	528 return(0);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	529 #else
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	530 return(1);
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	531 #endif
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	532 }
0aa6bf4b98ae - Don't wrap individual debug statements in ifdef, use a conditionally darius parents: 32 diff changeset	533

Mercurial > ~darius > hgwebdir.cgi > avr

annotate 1wire.c @ 35:fed32b382de2