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annotate ds1307.c @ 60:50fca9562310

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Add support for reading/writing to a DS1307 over TWI/IIC. Note that iic_read() appears to have a bug where it stops 1 byte earlier than expected, work around it for now by adding 1 in the gettod() function. tempctrl.c now prints the TOD as read from the RTC for each line.
author darius@Inchoate
date Thu, 30 Oct 2008 11:53:32 +1030
parents
children 0910ab6f0095
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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.
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75 */
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76 int
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77 iic_read(uint8_t *data, uint8_t len, uint8_t adr, uint8_t sla) {
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78 uint8_t twst, twcr, cnt;
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79
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80 /* Generate START */
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81 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
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82
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83 /* Spin waiting for START to be generated */
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84 while ((TWCR & _BV(TWINT)) == 0)
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85 ;
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86 switch (twst = TW_STATUS) {
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87 case TW_REP_START: /* OK but shouldn't happen */
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88 case TW_START:
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89 break;
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90
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91 case TW_MT_ARB_LOST:
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92 return IIC_FAILARB;
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93 break;
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94
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95 default:
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96 /* Not in start condition, bail */
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97 return IIC_UNKNOWN;
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98 }
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99 #ifdef TWDEBUG
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100 printf_P(PSTR("Sent START\r\n"));
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101 #endif
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102 /* Send SLA+W */
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103 TWDR = sla | TW_WRITE;
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104 TWCR = _BV(TWINT) | _BV(TWEN);
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105
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106 /* Spin waiting for a response to be generated */
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107 while ((TWCR & _BV(TWINT)) == 0)
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108 ;
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109
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110 #ifdef TWDEBUG
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111 printf_P(PSTR("Sent SLA+W\r\n"));
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112 #endif
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113 switch (twst = TW_STATUS) {
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114 case TW_MT_SLA_ACK:
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115 break;
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116
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117 case TW_MT_SLA_NACK:
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118 /* Send STOP */
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119 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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120 return IIC_SLNAK;
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121
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122 case TW_MT_ARB_LOST:
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123 return IIC_FAILARB;
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124 break;
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125
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126 default:
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127 /* Send STOP */
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128 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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129 return IIC_UNKNOWN;
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130 }
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131 /* Send address */
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132 TWDR = adr;
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133 TWCR = _BV(TWINT) | _BV(TWEN);
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134
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135 /* Spin waiting for a response to be generated */
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136 while ((TWCR & _BV(TWINT)) == 0)
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137 ;
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138 #ifdef TWDEBUG
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139 printf_P(PSTR("Sent address\r\n"));
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140 #endif
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141 switch ((twst = TW_STATUS)) {
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142 case TW_MT_DATA_ACK:
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143 break;
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144
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145 case TW_MT_DATA_NACK:
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146 /* Send STOP */
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147 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
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148 return IIC_SLNAK;
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149
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
150 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
151 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
152
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
153 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
154 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
155 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
156 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
157 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
158
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
159 /* Master receive cycle */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
160 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
161 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
162 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
163
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
164 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
165 printf_P(PSTR("Sent START\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
166 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
167 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
168 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
169 case TW_START:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
170 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
171
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
172 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
173 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
174
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
175 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
176 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
177 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
178 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
179 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
180
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
181 /* send SLA+R */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
182 TWDR = sla | TW_READ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
183 TWCR = _BV(TWINT) | _BV(TWEN); /* clear interrupt to start transmission */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
184
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
185 /* 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
186 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
187 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
188 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
189 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
190 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
191 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
192 case TW_MR_SLA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
193 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
194
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
195 case TW_MR_SLA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
196 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
197 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
198 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
199
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
200 case TW_MR_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
201 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
202
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
203 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
204 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
205 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
206 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
207 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
208
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
209 cnt = 0;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
210 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
211 len > 0; len--) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
212 /* Send NAK on last byte */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
213 if (len == 1)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
214 twcr = _BV(TWINT) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
215 TWCR = twcr; /* clear int to start transmission */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
216 /* 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
217 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
218 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
219 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
220 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
221 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
222 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
223 case TW_MR_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
224 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
225 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
226 return cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
227
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
228 case TW_MR_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
229 *data++ = TWDR;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
230 cnt++;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
231 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
232
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
233 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
234 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
235 }
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
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
238 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
239 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
240 return cnt;
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
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
243 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
244 * iic_write
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 * 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
247 * 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
248 * successive writes.
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 * 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
251 * 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
252 * IIC_FAILARB Failed bus arbitration.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
253 * IIC_SLNAK Slave NAK'd.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
254 * IIC_NOREPLY No reply (no such slave?)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
255 * IIC_UNKNOWN Unexpected return from TWI reg.
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
256 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
257 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
258 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
259 uint8_t twst, cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
260
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
261 /* Generate START */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
262 TWCR = _BV(TWINT) | _BV(TWSTA) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
263
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
264 /* Spin waiting for START to be generated */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
265 while ((TWCR & _BV(TWINT)) == 0)
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 switch (twst = TW_STATUS) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
268 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
269 case TW_START:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
270 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
271
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
272 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
273 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
274 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
275
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
276 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
277 /* Not in start condition, bail */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
278 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
279 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
280 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
281 printf_P(PSTR("Sent START\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
282 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
283
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
284 /* Send SLA+W */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
285 TWDR = sla | TW_WRITE;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
286 TWCR = _BV(TWINT) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
287
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
288 /* 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
289 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
290 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
291
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
292 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
293 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
294 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
295 switch (twst = TW_STATUS) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
296 case TW_MT_SLA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
297 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
298
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
299 case TW_MT_SLA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
300 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
301 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
302 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
303
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
304 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
305 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
306 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
307
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
308 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
309 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
310 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
311 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
312 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
313 /* Send address */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
314 TWDR = adr;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
315 TWCR = _BV(TWINT) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
316
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
317 /* 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
318 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
319 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
320 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
321 printf_P(PSTR("Sent address\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
322 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
323 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
324 case TW_MT_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
325 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
326
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
327 case TW_MT_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
328 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
329 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
330 return IIC_SLNAK;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
331
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
332 case TW_MT_ARB_LOST:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
333 return IIC_FAILARB;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
334
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
335 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
336 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
337 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
338 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
339 }
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 cnt = 0;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
342 for (; len > 0; len--) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
343 TWDR = *data++;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
344 TWCR = _BV(TWINT) | _BV(TWEN);
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 /* 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
347 while ((TWCR & _BV(TWINT)) == 0)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
348 ;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
349 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
350 printf_P(PSTR("Data sent\r\n"));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
351 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
352 switch ((twst = TW_STATUS)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
353 case TW_MT_DATA_NACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
354 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
355 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
356 return cnt;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
357
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
358 case TW_MT_DATA_ACK:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
359 cnt++;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
360 break;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
361
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
362 default:
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
363 return IIC_UNKNOWN;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
364 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
365 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
366
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
367 /* Send STOP */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
368 TWCR = _BV(TWINT) | _BV(TWSTO) | _BV(TWEN);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
369 return cnt;
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 * ds1307_gettod
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
374 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
375 * 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
376 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
377 * Note that we canonify to 24hr mode.
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 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
380 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
381 ds1307_gettod(ds1307raw_t *time) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
382 int len;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
383
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
384 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
385 if (len < 0) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
386 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
387 return(0);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
388 }
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 #if 1
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
391 if (len != sizeof(ds1307raw_t)) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
392 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
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 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
396
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
397 #ifdef TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
398 int i;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
399
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
400 for (i = 0; i < len; i++)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
401 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
402 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
403
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
404 return(1);
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
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
407 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
408 * ds1307_settod
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 * 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
411 * sc 2008/10/29 23:45:30
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 int
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
415 ds1307_settod(char *date) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
416 ds1307raw_t rtime;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
417 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
418
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
419 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
420 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
421 return(0);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
422 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
423
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
424 if (year > 1900)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
425 year -= 1900;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
426
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
427 rtime.split.year10 = year / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
428 rtime.split.year = year % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
429 rtime.split.month10 = month / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
430 rtime.split.month = month % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
431 rtime.split.day10 = day / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
432 rtime.split.day = day % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
433 rtime.split.pmam = ((hour / 10) & 0x02) >> 1;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
434 rtime.split.hour10 = (hour / 10) & 0x01;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
435 rtime.split.hour = hour % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
436 rtime.split.min10 = min / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
437 rtime.split.min = min % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
438 rtime.split.sec10 = sec / 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
439 rtime.split.sec = sec % 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
440
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
441 rtime.split.ch = 0; // Enable clock
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
442 rtime.split.s1224 = 0; // 24 hour mode
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
443 rtime.split.dow = 0; // XXX: unused
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
444 rtime.split.out = 0; // No clock out
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
445
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
446 #if TWDEBUG
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
447 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
448 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
449 #endif
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
450 if ((i = iic_write((uint8_t *)&rtime, sizeof(ds1307raw_t), 0, DS1307_ADR)) != sizeof(ds1307raw_t))
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
451 printf_P(PSTR("Unable to write to RTC, only sent %d (vs %d)\r\n"), i, sizeof(ds1307raw_t));
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
452
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
453 return(1);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
454 }
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
455
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
456 /*
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
457 * ds1307_printtime
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
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458 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
459 * Print the time in rtime with trailer
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
460 *
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
461 */
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
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462 void
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
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463 ds1307_printtime(char *leader, char *trailer) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
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464 ds1307raw_t rtime;
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darius@Inchoate
parents:
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465 uint8_t hour;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
466
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
467 if (ds1307_gettod(&rtime) != 1)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
468 return;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
469
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
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470 // Handle 12/24 hour time
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
471 hour = rtime.split.hour10 * 10 + rtime.split.hour;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
472 if (rtime.split.s1224) {
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
473 if (rtime.split.pmam)
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
474 hour += 12;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
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475 } else
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
476 hour += (rtime.split.pmam << 1) * 10;
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
477
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
478 printf_P(PSTR("%S%04d/%02d/%d %02d:%02d:%02d%S"), leader,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
479 1900 + rtime.split.year10 * 10 + rtime.split.year,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
480 rtime.split.month10 * 10 + rtime.split.month,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
481 rtime.split.day10 * 10 + rtime.split.day,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
482 hour,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
483 rtime.split.min10 * 10 + rtime.split.min,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
484 rtime.split.sec10 * 10 + rtime.split.sec,
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
485 trailer);
50fca9562310 Add support for reading/writing to a DS1307 over TWI/IIC.
darius@Inchoate
parents:
diff changeset
486 }