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
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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 /*
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42 * ds1307_init
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43 *
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44 * Setup TWI interface
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45 *
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46 */
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47 int
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48 ds1307_init(void) {
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49 TWSR = 0; /* TWI Prescaler = 1 */
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50
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51 #if F_CPU < 3600000UL
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52 TWBR = 10; /* Smallest valid TWBR */
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53 #else
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54 TWBR = (F_CPU / 100000UL - 16) / 2;
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55 #endif
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56
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57 TWCR = _BV(TWEN);
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58
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59 return(0);
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60 }
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61
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62 /*
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63 * iic_read
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64 *
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65 * Read len bytes of data from address adr in slave sla into
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66 * data. Presume that the slave auto-increments the address on
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67 * successive reads.
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68 *
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69 * Returns the number of bytes read, or the following on failure.
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70 * IIC_STFAIL Could generate START condition (broken bus or busy).
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71 * IIC_FAILARB Failed bus arbitration.
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72 * IIC_SLNAK Slave NAK'd.
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73 * IIC_NOREPLY No reply (no such slave?)
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74 * IIC_UNKNOWN Unexpected return from TWI reg.
61
0910ab6f0095 Add attribution for IIC routines.
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75 *
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76 * Heaviy cribbed from twitest.c by Joerg Wunsch
60
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77 */
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78 int
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79 iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla) {
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80 uint8_t twst, twcr, cnt;
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81
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82 /* Generate START */
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83 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
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84
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85 /* Spin waiting for START to be generated */
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86 while ((TWCR & _BV(TWINT)) == 0)
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87 ;
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88 switch (twst = TW_STATUS) {
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89 case TW_REP_START: /* OK but shouldn't happen */
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90 case TW_START:
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91 break;
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92
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93 case TW_MT_ARB_LOST:
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94 return IIC_FAILARB;
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95 break;
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96
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97 default:
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98 /* Not in start condition, bail */
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99 return IIC_UNKNOWN;
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100 }
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101 #ifdef TWDEBUG
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102 printf_P(PSTR("Sent START\r\n"));
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103 #endif
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104 /* Send SLA+W */
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105 TWDR = sla | TW_WRITE;
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106 TWCR = _BV(TWINT) | _BV(TWEN);
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107
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108 /* Spin waiting for a response to be generated */
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109 while ((TWCR & _BV(TWINT)) == 0)
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110 ;
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111
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112 #ifdef TWDEBUG
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113 printf_P(PSTR("Sent SLA+W\r\n"));
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114 #endif
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115 switch (twst = TW_STATUS) {
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116 case TW_MT_SLA_ACK:
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117 break;
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118
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119 case TW_MT_SLA_NACK:
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120 /* Send STOP */
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121 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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122 return IIC_SLNAK;
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123
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124 case TW_MT_ARB_LOST:
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125 return IIC_FAILARB;
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126 break;
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127
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128 default:
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129 /* Send STOP */
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130 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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131 return IIC_UNKNOWN;
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132 }
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133 /* Send address */
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134 TWDR = adr;
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135 TWCR = _BV(TWINT) | _BV(TWEN);
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136
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137 /* Spin waiting for a response to be generated */
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138 while ((TWCR & _BV(TWINT)) == 0)
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139 ;
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140 #ifdef TWDEBUG
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141 printf_P(PSTR("Sent address\r\n"));
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142 #endif
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143 switch ((twst = TW_STATUS)) {
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144 case TW_MT_DATA_ACK:
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145 break;
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146
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147 case TW_MT_DATA_NACK:
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148 /* Send STOP */
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149 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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150 return IIC_SLNAK;
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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:
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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:
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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;
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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:
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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
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456 if ((i = iic_write((uint8_t *)&rtime, sizeof(ds1307raw_t), 0, DS1307_ADR)) != sizeof(ds1307raw_t))
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darius@Inchoate
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457 printf_P(PSTR("Unable to write to RTC, only sent %d (vs %d)\r\n"), i, sizeof(ds1307raw_t));
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darius@Inchoate
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458
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darius@Inchoate
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459 return(1);
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darius@Inchoate
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460 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
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461
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
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462 /*
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darius@Inchoate
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463 * ds1307_printtime
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darius@Inchoate
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464 *
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darius@Inchoate
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465 * Print the time in rtime with trailer
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darius@Inchoate
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466 *
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darius@Inchoate
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467 */
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darius@Inchoate
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468 void
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darius@Inchoate
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469 ds1307_printtime(char *leader, char *trailer) {
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darius@Inchoate
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470 ds1307raw_t rtime;
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darius@Inchoate
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471 uint8_t hour;
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darius@Inchoate
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472
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darius@Inchoate
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473 if (ds1307_gettod(&rtime) != 1)
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darius@Inchoate
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474 return;
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darius@Inchoate
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475
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darius@Inchoate
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476 // Handle 12/24 hour time
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darius@Inchoate
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477 hour = rtime.split.hour10 * 10 + rtime.split.hour;
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darius@Inchoate
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diff changeset
478 if (rtime.split.s1224) {
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darius@Inchoate
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479 if (rtime.split.pmam)
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darius@Inchoate
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480 hour += 12;
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darius@Inchoate
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481 } else
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darius@Inchoate
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482 hour += (rtime.split.pmam << 1) * 10;
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darius@Inchoate
parents:
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483
65
1ef17cd8af7a Tab to space conversion in usage text.
darius@Inchoate
parents: 61
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484 printf_P(PSTR("%S%04d/%02d/%02d %02d:%02d:%02d%S"), leader,
60
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darius@Inchoate
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485 1900 + rtime.split.year10 * 10 + rtime.split.year,
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darius@Inchoate
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486 rtime.split.month10 * 10 + rtime.split.month,
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darius@Inchoate
parents:
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487 rtime.split.day10 * 10 + rtime.split.day,
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darius@Inchoate
parents:
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488 hour,
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darius@Inchoate
parents:
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489 rtime.split.min10 * 10 + rtime.split.min,
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darius@Inchoate
parents:
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490 rtime.split.sec10 * 10 + rtime.split.sec,
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darius@Inchoate
parents:
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491 trailer);
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darius@Inchoate
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492 }