avr: ds1307.c annotate

annotate ds1307.c @ 71:553c061fda7c default tip

Keep the newer GCC happy.

author	darius@Inchoate
date	Mon, 19 Jan 2009 22:54:19 +1030
parents	1ef17cd8af7a
children

rev	line source
60 50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	1 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	2 * Interface to a DS1307
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	3 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	4 * Copyright (c) 2008
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	6 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	7 * Redistribution and use in source and binary forms, with or without
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	8 * modification, are permitted provided that the following conditions
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	9 * are met:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	10 * 1. Redistributions of source code must retain the above copyright
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	11 * notice, this list of conditions and the following disclaimer.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	12 * 2. Redistributions in binary form must reproduce the above copyright
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	13 * notice, this list of conditions and the following disclaimer in the
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	14 * documentation and/or other materials provided with the distribution.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	15 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	26 * SUCH DAMAGE.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	27 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	28
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	29 #include <stdio.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	30 #include <stdlib.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	31 #include <inttypes.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	32 #include <avr/io.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	33 #include <avr/pgmspace.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	34 #include <util/twi.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	35 #include <util/delay.h>
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	36
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	37 #include "ds1307.h"
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	38
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	39 //#define TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	40
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	41 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	42 * ds1307_init
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	43 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	44 * Setup TWI interface
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	45 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	46 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	47 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	48 ds1307_init(void) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	49 TWSR = 0; /* TWI Prescaler = 1 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	50
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	51 #if F_CPU < 3600000UL
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	52 TWBR = 10; /* Smallest valid TWBR */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	53 #else
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	54 TWBR = (F_CPU / 100000UL - 16) / 2;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	55 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	56
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	57 TWCR = _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	58
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	59 return(0);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	60 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	61
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	62 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	63 * iic_read
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	64 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	65 * Read len bytes of data from address adr in slave sla into
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	66 * data. Presume that the slave auto-increments the address on
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	67 * successive reads.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	68 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	69 * Returns the number of bytes read, or the following on failure.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	70 * IIC_STFAIL Could generate START condition (broken bus or busy).
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	71 * IIC_FAILARB Failed bus arbitration.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	72 * IIC_SLNAK Slave NAK'd.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	73 * IIC_NOREPLY No reply (no such slave?)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	74 * IIC_UNKNOWN Unexpected return from TWI reg.
61 0910ab6f0095 Add attribution for IIC routines. darius@Inchoate parents: 60 diff changeset	75 *
0910ab6f0095 Add attribution for IIC routines. darius@Inchoate parents: 60 diff changeset	76 * Heaviy cribbed from twitest.c by Joerg Wunsch
60 50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	77 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	78 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	79 iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	80 uint8_t twst, twcr, cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	81
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	82 /* Generate START */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	83 TWCR = _BV(TWINT) \| _BV(TWSTA) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	84
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	85 /* Spin waiting for START to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	86 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	87 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	88 switch (twst = TW_STATUS) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	89 case TW_REP_START: /* OK but shouldn't happen */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	90 case TW_START:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	91 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	92
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	93 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	94 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	95 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	96
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	97 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	98 /* Not in start condition, bail */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	99 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	100 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	101 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	102 printf_P(PSTR("Sent START\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	103 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	104 /* Send SLA+W */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	105 TWDR = sla \| TW_WRITE;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	106 TWCR = _BV(TWINT) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	107
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	108 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	109 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	110 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	111
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	112 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	113 printf_P(PSTR("Sent SLA+W\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	114 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	115 switch (twst = TW_STATUS) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	116 case TW_MT_SLA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	117 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	118
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	119 case TW_MT_SLA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	120 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	121 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	122 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	123
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	124 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	125 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	126 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	127
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	128 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	129 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	130 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	131 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	132 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	133 /* Send address */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	134 TWDR = adr;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	135 TWCR = _BV(TWINT) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	136
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	137 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	138 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	139 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	140 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	141 printf_P(PSTR("Sent address\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	142 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	143 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	144 case TW_MT_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	145 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	146
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	147 case TW_MT_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	148 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	149 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	150 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	151
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	152 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	153 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	154
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	155 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	156 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	157 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	158 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	159 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	160
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	161 /* Master receive cycle */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	162 TWCR = _BV(TWINT) \| _BV(TWSTA) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	163 while ((TWCR & _BV(TWINT)) == 0) /* wait for transmission */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	164 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	165
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	166 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	167 printf_P(PSTR("Sent START\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	168 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	169 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	170 case TW_REP_START: /* OK but shouldn't happen */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	171 case TW_START:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	172 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	173
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	174 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	175 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	176
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	177 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	178 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	179 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	180 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	181 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	182
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	183 /* send SLA+R */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	184 TWDR = sla \| TW_READ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	185 TWCR = _BV(TWINT) \| _BV(TWEN); /* clear interrupt to start transmission */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	186
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	187 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	188 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	189 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	190 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	191 printf_P(PSTR("Sent SLA+R\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	192 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	193 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	194 case TW_MR_SLA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	195 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	196
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	197 case TW_MR_SLA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	198 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	199 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	200 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	201
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	202 case TW_MR_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	203 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	204
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	205 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	206 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	207 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	208 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	209 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	210
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	211 cnt = 0;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	212 for (twcr = _BV(TWINT) \| _BV(TWEN) \| _BV(TWEA);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	213 len > 0; len--) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	214 /* Send NAK on last byte */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	215 if (len == 1)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	216 twcr = _BV(TWINT) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	217 TWCR = twcr; /* clear int to start transmission */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	218 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	219 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	220 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	221 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	222 printf_P(PSTR("Data request done\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	223 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	224 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	225 case TW_MR_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	226 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	227 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
65 1ef17cd8af7a Tab to space conversion in usage text. darius@Inchoate parents: 61 diff changeset	228 //printf_P(PSTR("NACK on byte %d\r\n"), cnt);
60 50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	229 return cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	230
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	231 case TW_MR_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	232 *data++ = TWDR;
65 1ef17cd8af7a Tab to space conversion in usage text. darius@Inchoate parents: 61 diff changeset	233 //printf_P(PSTR("ACK on byte %d for 0x%02x\r\n"), cnt, *(data - 1));
60 50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	234 cnt++;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	235 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	236
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	237 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	238 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	239 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	240 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	241
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	242 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	243 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	244 return cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	245 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	246
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	247 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	248 * iic_write
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	249 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	250 * Write len bytes of data from address adr in slave sla into
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	251 * data. Presume that the slave auto-increments the address on
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	252 * successive writes.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	253 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	254 * Returns the number of bytes read, or the following on failure.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	255 * IIC_STFAIL Could generate START condition (broken bus or busy).
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	256 * IIC_FAILARB Failed bus arbitration.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	257 * IIC_SLNAK Slave NAK'd.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	258 * IIC_NOREPLY No reply (no such slave?)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	259 * IIC_UNKNOWN Unexpected return from TWI reg.
61 0910ab6f0095 Add attribution for IIC routines. darius@Inchoate parents: 60 diff changeset	260 *
0910ab6f0095 Add attribution for IIC routines. darius@Inchoate parents: 60 diff changeset	261 * Heaviy cribbed from twitest.c by Joerg Wunsch
60 50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	262 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	263 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	264 iic_write(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	265 uint8_t twst, cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	266
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	267 /* Generate START */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	268 TWCR = _BV(TWINT) \| _BV(TWSTA) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	269
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	270 /* Spin waiting for START to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	271 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	272 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	273 switch (twst = TW_STATUS) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	274 case TW_REP_START: /* OK but shouldn't happen */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	275 case TW_START:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	276 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	277
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	278 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	279 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	280 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	281
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	282 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	283 /* Not in start condition, bail */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	284 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	285 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	286 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	287 printf_P(PSTR("Sent START\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	288 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	289
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	290 /* Send SLA+W */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	291 TWDR = sla \| TW_WRITE;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	292 TWCR = _BV(TWINT) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	293
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	294 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	295 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	296 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	297
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	298 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	299 printf_P(PSTR("Sent SLA+W\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	300 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	301 switch (twst = TW_STATUS) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	302 case TW_MT_SLA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	303 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	304
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	305 case TW_MT_SLA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	306 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	307 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	308 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	309
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	310 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	311 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	312 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	313
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	314 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	315 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	316 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	317 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	318 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	319 /* Send address */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	320 TWDR = adr;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	321 TWCR = _BV(TWINT) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	322
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	323 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	324 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	325 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	326 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	327 printf_P(PSTR("Sent address\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	328 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	329 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	330 case TW_MT_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	331 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	332
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	333 case TW_MT_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	334 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	335 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	336 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	337
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	338 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	339 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	340
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	341 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	342 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	343 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	344 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	345 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	346
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	347 cnt = 0;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	348 for (; len > 0; len--) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	349 TWDR = *data++;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	350 TWCR = _BV(TWINT) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	351
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	352 /* Spin waiting for a response to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	353 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	354 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	355 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	356 printf_P(PSTR("Data sent\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	357 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	358 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	359 case TW_MT_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	360 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	361 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	362 return cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	363
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	364 case TW_MT_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	365 cnt++;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	366 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	367
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	368 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	369 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	370 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	371 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	372
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	373 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	374 TWCR = _BV(TWINT) \| _BV(TWSTO) \| _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	375 return cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	376 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	377
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	378 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	379 * ds1307_gettod
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	380 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	381 * Read time of day from DS1307 into time
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	382 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	383 * Note that we canonify to 24hr mode.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	384 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	385 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	386 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	387 ds1307_gettod(ds1307raw_t *time) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	388 int len;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	389
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	390 len = iic_read((uint8_t *)time, sizeof(ds1307raw_t) + 1, 0, DS1307_ADR);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	391 if (len < 0) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	392 printf_P(PSTR("iic_read failed - %d\r\n"), len);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	393 return(0);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	394 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	395
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	396 #if 1
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	397 if (len != sizeof(ds1307raw_t)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	398 printf_P(PSTR("Couldn't read from RTC, got %d bytes (vs %d)\r\n"), len, sizeof(ds1307raw_t));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	399 return(0);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	400 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	401 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	402
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	403 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	404 int i;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	405
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	406 for (i = 0; i < len; i++)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	407 printf_P(PSTR("0x%02x: 0x%02x\r\n"), i, (((uint8_t )time) + i));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	408 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	409
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	410 return(1);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	411 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	412
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	413 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	414 * ds1307_settod
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	415 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	416 * Set the DS1307 with the supplied time, format like so
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	417 * sc 2008/10/29 23:45:30
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	418 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	419 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	420 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	421 ds1307_settod(char *date) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	422 ds1307raw_t rtime;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	423 int i, year, month, day, hour, min, sec;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	424
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	425 if ((i = sscanf_P(date, PSTR("%d/%d/%d %d:%d:%d"), &year, &month, &day, &hour, &min, &sec)) != 6) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	426 printf_P(PSTR("Couldn't parse date, got %d\r\n"), i);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	427 return(0);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	428 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	429
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	430 if (year > 1900)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	431 year -= 1900;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	432
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	433 rtime.split.year10 = year / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	434 rtime.split.year = year % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	435 rtime.split.month10 = month / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	436 rtime.split.month = month % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	437 rtime.split.day10 = day / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	438 rtime.split.day = day % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	439 rtime.split.pmam = ((hour / 10) & 0x02) >> 1;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	440 rtime.split.hour10 = (hour / 10) & 0x01;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	441 rtime.split.hour = hour % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	442 rtime.split.min10 = min / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	443 rtime.split.min = min % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	444 rtime.split.sec10 = sec / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	445 rtime.split.sec = sec % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	446
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	447 rtime.split.ch = 0; // Enable clock
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	448 rtime.split.s1224 = 0; // 24 hour mode
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	449 rtime.split.dow = 0; // XXX: unused
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	450 rtime.split.out = 0; // No clock out
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	451
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	452 #if TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	453 for (i = 0; i < sizeof(ds1307raw_t); i++)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	454 printf_P(PSTR("0x%02x: 0x%02x\r\n"), i, (((uint8_t )rtime) + i));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	455 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	456 if ((i = iic_write((uint8_t *)&rtime, sizeof(ds1307raw_t), 0, DS1307_ADR)) != sizeof(ds1307raw_t))
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	457 printf_P(PSTR("Unable to write to RTC, only sent %d (vs %d)\r\n"), i, sizeof(ds1307raw_t));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	458
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	459 return(1);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	460 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	461
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	462 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	463 * ds1307_printtime
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	464 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	465 * Print the time in rtime with trailer
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	466 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	467 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	468 void
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	469 ds1307_printtime(char leader, char trailer) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	470 ds1307raw_t rtime;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	471 uint8_t hour;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	472
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	473 if (ds1307_gettod(&rtime) != 1)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	474 return;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	475
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	476 // Handle 12/24 hour time
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	477 hour = rtime.split.hour10 * 10 + rtime.split.hour;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	478 if (rtime.split.s1224) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	479 if (rtime.split.pmam)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	480 hour += 12;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	481 } else
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	482 hour += (rtime.split.pmam << 1) * 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	483
65 1ef17cd8af7a Tab to space conversion in usage text. darius@Inchoate parents: 61 diff changeset	484 printf_P(PSTR("%S%04d/%02d/%02d %02d:%02d:%02d%S"), leader,
60 50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	485 1900 + rtime.split.year10 * 10 + rtime.split.year,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	486 rtime.split.month10 * 10 + rtime.split.month,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	487 rtime.split.day10 * 10 + rtime.split.day,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	488 hour,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	489 rtime.split.min10 * 10 + rtime.split.min,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	490 rtime.split.sec10 * 10 + rtime.split.sec,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	491 trailer);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC. darius@Inchoate parents: diff changeset	492 }

Mercurial > ~darius > hgwebdir.cgi > avr

annotate ds1307.c @ 71:553c061fda7c default tip