annotate ds1307.c @ 14:d8002c716678

- Actually wait after reading like the spec says. - Add debug item to show a device was found in the search. - Re-enable test for broken bus.
author Daniel O'Connor <darius@dons.net.au>
date Wed, 08 Feb 2012 10:35:13 +1030
parents 119688bb743f
children b5e4591b6570
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1 /*
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2 * Interface to a DS1307
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3 *
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4 * Copyright (c) 2008
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5 * Daniel O'Connor <darius@dons.net.au>. All rights reserved.
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6 *
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #include <stdio.h>
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30 #include <stdlib.h>
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31 #include <inttypes.h>
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32 #include <avr/io.h>
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33 #include <avr/pgmspace.h>
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34 #include <util/twi.h>
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35 #include <util/delay.h>
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36
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37 #include "ds1307.h"
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38
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39 // #define TWDEBUG
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40
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41 /* Helper code to wait for the TWCR to do something */
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42 #define WAITFORTWINT() do { \
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43 uint8_t i; \
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44 for (i = 0; i < 255 && (TWCR & _BV(TWINT)) == 0; i++) \
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45 _delay_ms(1); \
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46 if (i == 255) \
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47 return(IIC_NORESP); \
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48 } while (0)
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49
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50
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51 /*
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52 * ds1307_init
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53 *
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54 * Setup TWI interface
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55 *
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56 */
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57 int
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58 ds1307_init(void) {
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59 #ifdef PRR
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60 PRR &= ~_BV(PRTWI); /* Power TWI on - note that the
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61 * datasheet says this is already 0 at
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62 * power on.. */
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63 #endif
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64 TWSR = 0; /* TWI Prescaler = 1 */
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65 #if F_CPU < 3600000UL
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66 TWBR = 10; /* Smallest valid TWBR */
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67 #else
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68 TWBR = (F_CPU / 100000UL - 16) / 2;
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69 #endif
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70
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71 TWCR = _BV(TWEN);
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72
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73 return(0);
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74 }
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75
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76 /*
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77 * iic_read
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78 *
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79 * Read len bytes of data from address adr in slave sla into
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80 * data. Presume that the slave auto-increments the address on
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81 * successive reads.
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82 *
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83 * Returns the number of bytes read, or the following on failure.
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84 * IIC_STFAIL Could generate START condition (broken bus or busy).
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85 * IIC_FAILARB Failed bus arbitration.
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86 * IIC_SLNAK Slave NAK'd.
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87 * IIC_NOREPLY No reply (no such slave?)
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88 * IIC_UNKNOWN Unexpected return from TWI reg.
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89 *
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90 * Heaviy cribbed from twitest.c by Joerg Wunsch
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91 */
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92 int8_t
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93 iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla) {
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94 uint8_t twst, twcr, cnt;
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95
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96 /* Generate START */
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97 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
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98
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99 /* Spin waiting for START to be generated */
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100 WAITFORTWINT();
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101
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102 switch (twst = TW_STATUS) {
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103 case TW_REP_START: /* OK but shouldn't happen */
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104 case TW_START:
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105 break;
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106
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107 case TW_MT_ARB_LOST:
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108 return IIC_FAILARB;
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109 break;
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110
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111 default:
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112 /* Not in start condition, bail */
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113 return IIC_UNKNOWN;
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114 }
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115 #ifdef TWDEBUG
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116 printf_P(PSTR("Sent START\r\n"));
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117 #endif
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118 /* Send SLA+W */
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119 TWDR = sla | TW_WRITE;
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120 TWCR = _BV(TWINT) | _BV(TWEN);
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121
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122 /* Spin waiting for a response to be generated */
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123 WAITFORTWINT();
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124
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125 #ifdef TWDEBUG
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126 printf_P(PSTR("Sent SLA+W\r\n"));
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127 #endif
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128 switch (twst = TW_STATUS) {
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129 case TW_MT_SLA_ACK:
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130 break;
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131
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132 case TW_MT_SLA_NACK:
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133 /* Send STOP */
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134 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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135 return IIC_SLNAK;
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136
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137 case TW_MT_ARB_LOST:
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138 return IIC_FAILARB;
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139 break;
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140
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141 default:
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142 /* Send STOP */
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143 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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144 return IIC_UNKNOWN;
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145 }
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146 /* Send address */
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147 TWDR = adr;
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148 TWCR = _BV(TWINT) | _BV(TWEN);
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149
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150 /* Spin waiting for a response to be generated */
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151 WAITFORTWINT();
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152
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153 #ifdef TWDEBUG
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154 printf_P(PSTR("Sent address\r\n"));
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155 #endif
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156 switch ((twst = TW_STATUS)) {
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157 case TW_MT_DATA_ACK:
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158 break;
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159
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160 case TW_MT_DATA_NACK:
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161 /* Send STOP */
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162 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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163 return IIC_SLNAK;
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164
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165 case TW_MT_ARB_LOST:
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166 return IIC_FAILARB;
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167
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168 default:
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169 /* Send STOP */
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170 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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171 return IIC_UNKNOWN;
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172 }
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173
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174 /* Master receive cycle */
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175 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
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parents: 6
diff changeset
176
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
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parents: 6
diff changeset
177 /* wait for transmission */
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178 WAITFORTWINT();
0
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darius@Inchoate
parents:
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179
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darius@Inchoate
parents:
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180 #ifdef TWDEBUG
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darius@Inchoate
parents:
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181 printf_P(PSTR("Sent START\r\n"));
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darius@Inchoate
parents:
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182 #endif
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darius@Inchoate
parents:
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183 switch ((twst = TW_STATUS)) {
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darius@Inchoate
parents:
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184 case TW_REP_START: /* OK but shouldn't happen */
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darius@Inchoate
parents:
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185 case TW_START:
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darius@Inchoate
parents:
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186 break;
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darius@Inchoate
parents:
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187
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darius@Inchoate
parents:
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188 case TW_MT_ARB_LOST:
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darius@Inchoate
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189 return IIC_FAILARB;
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darius@Inchoate
parents:
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190
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darius@Inchoate
parents:
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191 default:
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darius@Inchoate
parents:
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192 /* Send STOP */
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darius@Inchoate
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193 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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darius@Inchoate
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194 return IIC_UNKNOWN;
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darius@Inchoate
parents:
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195 }
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darius@Inchoate
parents:
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196
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darius@Inchoate
parents:
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197 /* send SLA+R */
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darius@Inchoate
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198 TWDR = sla | TW_READ;
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darius@Inchoate
parents:
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199 TWCR = _BV(TWINT) | _BV(TWEN); /* clear interrupt to start transmission */
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darius@Inchoate
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200
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darius@Inchoate
parents:
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201 /* Spin waiting for a response to be generated */
8
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
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parents: 6
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202 WAITFORTWINT();
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
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203
0
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darius@Inchoate
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204 #ifdef TWDEBUG
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darius@Inchoate
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205 printf_P(PSTR("Sent SLA+R\r\n"));
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darius@Inchoate
parents:
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206 #endif
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darius@Inchoate
parents:
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207 switch ((twst = TW_STATUS)) {
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darius@Inchoate
parents:
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208 case TW_MR_SLA_ACK:
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darius@Inchoate
parents:
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209 break;
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darius@Inchoate
parents:
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210
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darius@Inchoate
parents:
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211 case TW_MR_SLA_NACK:
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darius@Inchoate
parents:
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212 /* Send STOP */
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darius@Inchoate
parents:
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213 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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darius@Inchoate
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214 return IIC_SLNAK;
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darius@Inchoate
parents:
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215
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darius@Inchoate
parents:
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216 case TW_MR_ARB_LOST:
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darius@Inchoate
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217 return IIC_FAILARB;
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darius@Inchoate
parents:
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218
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darius@Inchoate
parents:
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219 default:
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darius@Inchoate
parents:
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220 /* Send STOP */
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darius@Inchoate
parents:
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221 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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darius@Inchoate
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222 return IIC_UNKNOWN;
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darius@Inchoate
parents:
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223 }
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darius@Inchoate
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224
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darius@Inchoate
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225 cnt = 0;
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darius@Inchoate
parents:
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226 for (twcr = _BV(TWINT) | _BV(TWEN) | _BV(TWEA);
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darius@Inchoate
parents:
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227 len > 0; len--) {
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darius@Inchoate
parents:
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228 /* Send NAK on last byte */
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darius@Inchoate
parents:
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229 if (len == 1)
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darius@Inchoate
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230 twcr = _BV(TWINT) | _BV(TWEN);
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darius@Inchoate
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231 TWCR = twcr; /* clear int to start transmission */
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darius@Inchoate
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232 /* Spin waiting for a response to be generated */
8
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
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233 WAITFORTWINT();
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
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234
0
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darius@Inchoate
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235 #ifdef TWDEBUG
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darius@Inchoate
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236 printf_P(PSTR("Data request done\r\n"));
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darius@Inchoate
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237 #endif
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darius@Inchoate
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238 switch ((twst = TW_STATUS)) {
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darius@Inchoate
parents:
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239 case TW_MR_DATA_NACK:
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darius@Inchoate
parents:
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240 /* Send STOP */
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darius@Inchoate
parents:
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241 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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darius@Inchoate
parents:
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242 //printf_P(PSTR("NACK on byte %d\r\n"), cnt);
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darius@Inchoate
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243 return cnt;
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darius@Inchoate
parents:
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244
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darius@Inchoate
parents:
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245 case TW_MR_DATA_ACK:
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darius@Inchoate
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246 *data++ = TWDR;
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darius@Inchoate
parents:
diff changeset
247 //printf_P(PSTR("ACK on byte %d for 0x%02x\r\n"), cnt, *(data - 1));
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darius@Inchoate
parents:
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248 cnt++;
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darius@Inchoate
parents:
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249 break;
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darius@Inchoate
parents:
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250
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darius@Inchoate
parents:
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251 default:
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darius@Inchoate
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252 return IIC_UNKNOWN;
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darius@Inchoate
parents:
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253 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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254 }
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darius@Inchoate
parents:
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255
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darius@Inchoate
parents:
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256 /* Send STOP */
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darius@Inchoate
parents:
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257 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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darius@Inchoate
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258 return cnt;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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259 }
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darius@Inchoate
parents:
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260
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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261 /*
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darius@Inchoate
parents:
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262 * iic_write
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darius@Inchoate
parents:
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263 *
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darius@Inchoate
parents:
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264 * Write len bytes of data from address adr in slave sla into
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darius@Inchoate
parents:
diff changeset
265 * data. Presume that the slave auto-increments the address on
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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266 * successive writes.
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darius@Inchoate
parents:
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267 *
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darius@Inchoate
parents:
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268 * Returns the number of bytes read, or the following on failure.
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darius@Inchoate
parents:
diff changeset
269 * IIC_STFAIL Could generate START condition (broken bus or busy).
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darius@Inchoate
parents:
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270 * IIC_FAILARB Failed bus arbitration.
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darius@Inchoate
parents:
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271 * IIC_SLNAK Slave NAK'd.
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darius@Inchoate
parents:
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272 * IIC_NOREPLY No reply (no such slave?)
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darius@Inchoate
parents:
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273 * IIC_UNKNOWN Unexpected return from TWI reg.
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darius@Inchoate
parents:
diff changeset
274 *
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darius@Inchoate
parents:
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275 * Heaviy cribbed from twitest.c by Joerg Wunsch
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darius@Inchoate
parents:
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276 */
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darius@Inchoate
parents:
diff changeset
277 int8_t
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darius@Inchoate
parents:
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278 iic_write(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla) {
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darius@Inchoate
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diff changeset
279 uint8_t twst, cnt;
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darius@Inchoate
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280
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darius@Inchoate
parents:
diff changeset
281 /* Generate START */
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darius@Inchoate
parents:
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282 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
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darius@Inchoate
parents:
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283
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
284 /* Spin waiting for START to be generated */
8
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
285 WAITFORTWINT();
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
286
0
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darius@Inchoate
parents:
diff changeset
287 switch (twst = TW_STATUS) {
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darius@Inchoate
parents:
diff changeset
288 case TW_REP_START: /* OK but shouldn't happen */
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darius@Inchoate
parents:
diff changeset
289 case TW_START:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
290 break;
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darius@Inchoate
parents:
diff changeset
291
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
292 case TW_MT_ARB_LOST:
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darius@Inchoate
parents:
diff changeset
293 return IIC_FAILARB;
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darius@Inchoate
parents:
diff changeset
294 break;
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darius@Inchoate
parents:
diff changeset
295
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
296 default:
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darius@Inchoate
parents:
diff changeset
297 /* Not in start condition, bail */
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darius@Inchoate
parents:
diff changeset
298 return IIC_UNKNOWN;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
299 }
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darius@Inchoate
parents:
diff changeset
300 #ifdef TWDEBUG
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darius@Inchoate
parents:
diff changeset
301 printf_P(PSTR("Sent START\r\n"));
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
302 #endif
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
303
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
304 /* Send SLA+W */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
305 TWDR = sla | TW_WRITE;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
306 TWCR = _BV(TWINT) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
307
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
308 /* Spin waiting for a response to be generated */
8
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
309 WAITFORTWINT();
0
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darius@Inchoate
parents:
diff changeset
310
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darius@Inchoate
parents:
diff changeset
311 #ifdef TWDEBUG
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darius@Inchoate
parents:
diff changeset
312 printf_P(PSTR("Sent SLA+W\r\n"));
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darius@Inchoate
parents:
diff changeset
313 #endif
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darius@Inchoate
parents:
diff changeset
314 switch (twst = TW_STATUS) {
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darius@Inchoate
parents:
diff changeset
315 case TW_MT_SLA_ACK:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
316 break;
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darius@Inchoate
parents:
diff changeset
317
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
318 case TW_MT_SLA_NACK:
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darius@Inchoate
parents:
diff changeset
319 /* Send STOP */
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darius@Inchoate
parents:
diff changeset
320 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
321 return IIC_SLNAK;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
322
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
323 case TW_MT_ARB_LOST:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
324 return IIC_FAILARB;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
325 break;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
326
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
327 default:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
328 /* Send STOP */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
329 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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darius@Inchoate
parents:
diff changeset
330 return IIC_UNKNOWN;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
331 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
332 /* Send address */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
333 TWDR = adr;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
334 TWCR = _BV(TWINT) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
335
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
336 /* Spin waiting for a response to be generated */
8
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
337 WAITFORTWINT();
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
338
0
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darius@Inchoate
parents:
diff changeset
339 #ifdef TWDEBUG
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darius@Inchoate
parents:
diff changeset
340 printf_P(PSTR("Sent address\r\n"));
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
341 #endif
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
342 switch ((twst = TW_STATUS)) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
343 case TW_MT_DATA_ACK:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
344 break;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
345
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
346 case TW_MT_DATA_NACK:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
347 /* Send STOP */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
348 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
349 return IIC_SLNAK;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
350
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
351 case TW_MT_ARB_LOST:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
352 return IIC_FAILARB;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
353
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
354 default:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
355 /* Send STOP */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
356 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
357 return IIC_UNKNOWN;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
358 }
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darius@Inchoate
parents:
diff changeset
359
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
360 cnt = 0;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
361 for (; len > 0; len--) {
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darius@Inchoate
parents:
diff changeset
362 TWDR = *data++;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
363 TWCR = _BV(TWINT) | _BV(TWEN);
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darius@Inchoate
parents:
diff changeset
364
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darius@Inchoate
parents:
diff changeset
365 /* Spin waiting for a response to be generated */
8
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
366 WAITFORTWINT();
119688bb743f Don't spin forever waiting for the TWI hardware to do something.
darius@dons.net.au
parents: 6
diff changeset
367
0
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darius@Inchoate
parents:
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368 #ifdef TWDEBUG
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darius@Inchoate
parents:
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369 printf_P(PSTR("Data sent\r\n"));
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darius@Inchoate
parents:
diff changeset
370 #endif
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darius@Inchoate
parents:
diff changeset
371 switch ((twst = TW_STATUS)) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
372 case TW_MT_DATA_NACK:
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
373 /* Send STOP */
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darius@Inchoate
parents:
diff changeset
374 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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375 return cnt;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
376
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
377 case TW_MT_DATA_ACK:
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darius@Inchoate
parents:
diff changeset
378 cnt++;
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darius@Inchoate
parents:
diff changeset
379 break;
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darius@Inchoate
parents:
diff changeset
380
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
381 default:
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darius@Inchoate
parents:
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382 return IIC_UNKNOWN;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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383 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
384 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
385
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darius@Inchoate
parents:
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386 /* Send STOP */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
387 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
388 return cnt;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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389 }
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darius@Inchoate
parents:
diff changeset
390
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darius@Inchoate
parents:
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391 /*
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darius@Inchoate
parents:
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392 * ds1307_gettod
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darius@Inchoate
parents:
diff changeset
393 *
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
394 * Read time of day from DS1307 into time
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
395 *
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
396 * Note that we canonify to 24hr mode.
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
397 *
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darius@Inchoate
parents:
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398 */
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darius@Inchoate
parents:
diff changeset
399 int8_t
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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400 ds1307_gettod(ds1307raw_t *time) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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401 int8_t len;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
402
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darius@Inchoate
parents:
diff changeset
403 len = iic_read((uint8_t *)time, sizeof(ds1307raw_t) + 1, 0, DS1307_ADR);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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404 if (len < 0) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
405 printf_P(PSTR("iic_read failed - %d\r\n"), len);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
406 return(0);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
407 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
408
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darius@Inchoate
parents:
diff changeset
409 #if 1
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
410 if (len != sizeof(ds1307raw_t)) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
411 printf_P(PSTR("Only got %d bytes (vs %d)\r\n"), len, sizeof(ds1307raw_t));
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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412 return(0);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
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413 }
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darius@Inchoate
parents:
diff changeset
414 #endif
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darius@Inchoate
parents:
diff changeset
415
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
416 #ifdef TWDEBUG
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
417 int i;
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darius@Inchoate
parents:
diff changeset
418
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darius@Inchoate
parents:
diff changeset
419 for (i = 0; i < len; i++)
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darius@Inchoate
parents:
diff changeset
420 printf_P(PSTR("0x%02x: 0x%02x\r\n"), i, *(((uint8_t *)time) + i));
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
421 #endif
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darius@Inchoate
parents:
diff changeset
422
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darius@Inchoate
parents:
diff changeset
423 return(1);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
424 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
425
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
426 /*
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
427 * ds1307_settod
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darius@Inchoate
parents:
diff changeset
428 *
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darius@Inchoate
parents:
diff changeset
429 * Set the DS1307 with the supplied time, format like so
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
430 * sc 2008/10/29 23:45:30
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
431 *
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
432 */
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darius@Inchoate
parents:
diff changeset
433 int8_t
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
434 ds1307_settod(char *date) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
435 ds1307raw_t rtime;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
436 uint16_t year;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
437 uint8_t i, month, day, hour, min, sec;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
438
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
439 if ((i = sscanf_P(date, PSTR("%hu/%hhd/%hhd %hhd:%hhd:%hhd"), &year, &month, &day, &hour, &min, &sec)) != 6) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
440 printf_P(PSTR("Can't parse date\r\n"));
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darius@Inchoate
parents:
diff changeset
441 return(0);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
442 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
443
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darius@Inchoate
parents:
diff changeset
444 if (year > 1900)
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
445 year -= 1900;
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darius@Inchoate
parents:
diff changeset
446
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
447 rtime.split.year10 = year / 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
448 rtime.split.year = year % 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
449 rtime.split.month10 = month / 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
450 rtime.split.month = month % 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
451 rtime.split.day10 = day / 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
452 rtime.split.day = day % 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
453 rtime.split.pmam = ((hour / 10) & 0x02) >> 1;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
454 rtime.split.hour10 = (hour / 10) & 0x01;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
455 rtime.split.hour = hour % 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
456 rtime.split.min10 = min / 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
457 rtime.split.min = min % 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
458 rtime.split.sec10 = sec / 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
459 rtime.split.sec = sec % 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
460
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
461 rtime.split.ch = 0; // Enable clock
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darius@Inchoate
parents:
diff changeset
462 rtime.split.s1224 = 0; // 24 hour mode
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darius@Inchoate
parents:
diff changeset
463 rtime.split.dow = 0; // XXX: unused
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darius@Inchoate
parents:
diff changeset
464 rtime.split.out = 0; // No clock out
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
465
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
466 #ifdef TWDEBUG
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
467 for (i = 0; i < sizeof(ds1307raw_t); i++)
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
468 printf_P(PSTR("0x%02x: 0x%02x\r\n"), i, *(((uint8_t *)&rtime) + i));
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
469 #endif
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
470 if ((i = iic_write((uint8_t *)&rtime, sizeof(ds1307raw_t), 0, DS1307_ADR)) != sizeof(ds1307raw_t))
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
471 printf_P(PSTR("Can't write to RTC, sent %d (vs %d)\r\n"), i, sizeof(ds1307raw_t));
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
472
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
473 return(1);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
474 }
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
475
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
476 /*
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
477 * ds1307_printtime
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
478 *
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
479 * Print the time in rtime with trailer
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
480 *
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
481 */
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
482 void
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
483 ds1307_printtime(char *leader, char *trailer) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
484 ds1307raw_t rtime;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
485 uint8_t hour;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
486
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
487 if (ds1307_gettod(&rtime) != 1)
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
488 return;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
489
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
490 // Handle 12/24 hour time
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
491 hour = rtime.split.hour10 * 10 + rtime.split.hour;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
492 if (rtime.split.s1224) {
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
493 if (rtime.split.pmam)
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
494 hour += 12;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
495 } else
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
496 hour += (rtime.split.pmam << 1) * 10;
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
497
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
498 printf_P(PSTR("%S%04d/%02d/%02d %02d:%02d:%02d%S"), leader,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
499 1900 + rtime.split.year10 * 10 + rtime.split.year,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
500 rtime.split.month10 * 10 + rtime.split.month,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
501 rtime.split.day10 * 10 + rtime.split.day,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
502 hour,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
503 rtime.split.min10 * 10 + rtime.split.min,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
504 rtime.split.sec10 * 10 + rtime.split.sec,
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
505 trailer);
3879f487b661 Initial commit of routines I copy and paste.
darius@Inchoate
parents:
diff changeset
506 }