annotate main.c @ 10:1bfe28c348dd

reading DS18B20 works add some linker optimisations
author Matt Johnston <matt@ucc.asn.au>
date Sat, 19 May 2012 17:10:13 +0800
parents 7da9a3f23592
children 3c27bfbd7f3a
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1 /* Name: main.c
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2 * Author: <insert your name here>
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3 * Copyright: <insert your copyright message here>
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4 * License: <insert your license reference here>
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5 */
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6
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7 #include <stdio.h>
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8 #include <string.h>
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9 #include <avr/io.h>
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10 #include <avr/interrupt.h>
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11 #include <avr/sleep.h>
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12 #include <util/delay.h>
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13 #include <avr/pgmspace.h>
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14 #include <util/crc16.h>
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15
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16 #include "integer.h"
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17 #include "onewire.h"
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18 #include "ds18x20.h"
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19
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20 // configuration params
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21 // - measurement interval
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22 // - transmit interval
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23 // - bluetooth params
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24 // - number of sensors (and range?)
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25
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26 // 1 second. we have 1024 prescaler, 32768 crystal.
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27 #define SLEEP_COMPARE 32
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28 #define MEASURE_WAKE 60
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29
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30 #define COMMS_WAKE 3600
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31
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32 #define BAUD 19200
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33 #define UBRR ((F_CPU)/8/(BAUD)-1)
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34
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35 #define PORT_LED PORTC
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36 #define DDR_LED DDRC
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37 #define PIN_LED PC4
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38
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39 #define NUM_MEASUREMENTS 300
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40
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41 int uart_putchar(char c, FILE *stream);
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42 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL,
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43 _FDEV_SETUP_WRITE);
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44
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45 static uint8_t n_measurements = 0;
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46 // stored as 1/5 degree above 0
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47 static uint8_t measurements[NUM_MEASUREMENTS];
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48 static uint8_t internal_measurements[NUM_MEASUREMENTS];
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49
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50 // boolean flags
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51 static uint8_t need_measurement = 0;
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52 static uint8_t need_comms = 0;
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53 static uint8_t comms_done = 0;
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54
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55 static uint8_t readpos = 0;
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56 static char readbuf[30];
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57
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58 static uint8_t measure_count = 0;
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59 static uint16_t comms_count = 0;
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60
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61 #define DEBUG(str) printf_P(PSTR(str))
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62
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63 static void deep_sleep();
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64
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65 static void
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66 uart_on()
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67 {
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68 // Power reduction register
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69 //PRR &= ~_BV(PRUSART0);
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70
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71 // baud rate
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72 UBRR0H = (unsigned char)(UBRR >> 8);
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73 UBRR0L = (unsigned char)UBRR;
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74 // set 2x clock, improves accuracy of UBRR
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75 UCSR0A |= _BV(U2X0);
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76 UCSR0B = _BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0);
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77 //8N1
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78 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00);
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79 }
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80
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81 static void
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82 uart_off()
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83 {
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84 // Turn of interrupts and disable tx/rx
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85 UCSR0B = 0;
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86
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87 // Power reduction register
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88 //PRR |= _BV(PRUSART0);
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89 }
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90
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91 int
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92 uart_putchar(char c, FILE *stream)
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93 {
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94 // XXX should sleep in the loop for power.
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95 if (c == '\n')
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96 {
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97 loop_until_bit_is_set(UCSR0A, UDRE0);
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98 UDR0 = '\r';;
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99 }
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100 loop_until_bit_is_set(UCSR0A, UDRE0);
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101 UDR0 = c;
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102 if (c == '\r')
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103 {
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104 loop_until_bit_is_set(UCSR0A, UDRE0);
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105 UDR0 = '\n';;
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106 }
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107 return 0;
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108 }
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109
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110 static void
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111 cmd_fetch()
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112 {
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113 uint16_t crc = 0;
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114 int i;
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115 printf_P(PSTR("%d measurements\n"), n_measurements);
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116 for (i = 0; i < n_measurements; i++)
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117 {
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118 printf_P(PSTR("%3d : %d\n"), i, measurements[i]);
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119 crc = _crc_ccitt_update(crc, measurements[i]);
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120 }
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121 printf_P(PSTR("CRC : %d\n"), crc);
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122 }
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123
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124 static void
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125 cmd_clear()
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126 {
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127 n_measurements = 0;
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128 printf_P(PSTR("Cleared\n"));
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129 }
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130
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131 static void
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132 cmd_btoff()
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133 {
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134 printf_P(PSTR("Turning off\n"));
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135 _delay_ms(50);
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136 comms_done = 1;
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137 }
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138
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139 static void
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140 read_handler()
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141 {
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142 if (strcmp_P(readbuf, PSTR("fetch")) == 0)
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143 {
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144 cmd_fetch();
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145 }
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146 else if (strcmp_P(readbuf, PSTR("clear")) == 0)
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147 {
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148 cmd_clear();
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149 }
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150 else if (strcmp_P(readbuf, PSTR("btoff")) == 0)
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151 {
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152 cmd_btoff();
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153 }
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154 else
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155 {
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156 printf_P(PSTR("Bad command\n"));
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157 }
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158 }
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159
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160 ISR(USART_RX_vect)
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161 {
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162 char c = UDR0;
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163 if (c == '\n')
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164 {
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165 readbuf[readpos] = '\0';
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166 read_handler();
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167 readpos = 0;
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168 }
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169 else
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170 {
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171 readbuf[readpos] = c;
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172 readpos++;
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173 if (readpos >= sizeof(readbuf))
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174 {
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175 readpos = 0;
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176 }
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177 }
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178 }
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179
2
ab0e30c4b344 switch to atmega328
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180 ISR(TIMER2_COMPA_vect)
1
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181 {
4
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182 measure_count ++;
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183 comms_count ++;
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184 if (measure_count == MEASURE_WAKE)
1
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185 {
4
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186 measure_count = 0;
1
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187 need_measurement = 1;
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188 }
4
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189
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190 if (comms_count == COMMS_WAKE)
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191 {
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192 comms_count = 0;
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193 need_comms = 1;
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194 }
1
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parents: 0
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195 }
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196
3
888be1b234b6 Add FatFS
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197 DWORD get_fattime (void)
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198 {
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199 return 0;
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200 }
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201
1
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202 static void
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203 deep_sleep()
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204 {
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205 // p119 of manual
2
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206 OCR2A = SLEEP_COMPARE;
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207 loop_until_bit_is_clear(ASSR, OCR2AUB);
1
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208
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209 set_sleep_mode(SLEEP_MODE_PWR_SAVE);
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210 sleep_mode();
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211 }
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212
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213 static void
4
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214 idle_sleep()
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215 {
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216 set_sleep_mode(SLEEP_MODE_IDLE);
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217 sleep_mode();
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218 }
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219
6
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220 static void
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221 do_adc_335()
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222 {
8
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223 //PRR &= ~_BV(PRADC);
6
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224
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225 ADMUX = _BV(ADLAR);
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226
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227 // ADPS2 = /16 prescaler, 62khz at 1mhz clock
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228 ADCSRA = _BV(ADEN) | _BV(ADPS2);
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229
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230 // measure value
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231 ADCSRA |= _BV(ADSC);
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diff changeset
232 loop_until_bit_is_clear(ADCSRA, ADSC);
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233 uint8_t low = ADCL;
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diff changeset
234 uint8_t high = ADCH;
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diff changeset
235 uint16_t f_measure = low + (high << 8);
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236
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237 // set to measure 1.1 reference
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diff changeset
238 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1);
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diff changeset
239 ADCSRA |= _BV(ADSC);
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diff changeset
240 loop_until_bit_is_clear(ADCSRA, ADSC);
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diff changeset
241 uint8_t low_11 = ADCL;
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diff changeset
242 uint8_t high_11 = ADCH;
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diff changeset
243 uint16_t f_11 = low_11 + (high_11 << 8);
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244
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diff changeset
245 float res_volts = 1.1 * f_measure / f_11;
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diff changeset
246
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247 // 10mV/degree
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diff changeset
248 // scale to 1/5 degree units above 0C
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diff changeset
249 int temp = (res_volts - 2.73) * 500;
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diff changeset
250 measurements[n_measurements] = temp;
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diff changeset
251 // XXX something if it hits the limit
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diff changeset
252
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diff changeset
253 // measure AVR internal temperature against 1.1 ref.
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diff changeset
254 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(REFS1) | _BV(REFS0);
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diff changeset
255 ADCSRA |= _BV(ADSC);
9d538f674ff0 - Some basic ADC code
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diff changeset
256 loop_until_bit_is_clear(ADCSRA, ADSC);
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diff changeset
257 uint16_t res_internal = ADCL;
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diff changeset
258 res_internal |= ADCH << 8;
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diff changeset
259
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diff changeset
260 float internal_volts = res_internal * (1.1 / 1024.0);
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diff changeset
261
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diff changeset
262 // 1mV/degree
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diff changeset
263 int internal_temp = (internal_volts - 2.73) * 5000;
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parents: 5
diff changeset
264 internal_measurements[n_measurements] = internal_temp;
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parents: 5
diff changeset
265
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diff changeset
266 printf_P("measure %d: external %d, internal %d, 1.1 %d\n",
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diff changeset
267 n_measurements, temp, internal_temp, f_11);
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parents: 5
diff changeset
268
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diff changeset
269 n_measurements++;
8
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diff changeset
270 //PRR |= _BV(PRADC);
6
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diff changeset
271 }
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diff changeset
272
4
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parents: 3
diff changeset
273 static void
1
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parents: 0
diff changeset
274 do_measurement()
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parents: 0
diff changeset
275 {
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parents: 0
diff changeset
276 need_measurement = 0;
6
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parents: 5
diff changeset
277
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parents: 5
diff changeset
278 do_adc_335();
1
1d1897d66b03 Some counter2 bits
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parents: 0
diff changeset
279 }
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parents: 0
diff changeset
280
4
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parents: 3
diff changeset
281 static void
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diff changeset
282 do_comms()
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diff changeset
283 {
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diff changeset
284 need_comms = 0;
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diff changeset
285
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diff changeset
286 // turn on bluetooth
7
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diff changeset
287 uart_on();
4
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diff changeset
288
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diff changeset
289 // write sd card here? same 3.3v regulator...
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diff changeset
290
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parents: 3
diff changeset
291 comms_done = 0;
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parents: 3
diff changeset
292 for (;;)
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parents: 3
diff changeset
293 {
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parents: 3
diff changeset
294 if (comms_done)
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parents: 3
diff changeset
295 {
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parents: 3
diff changeset
296 break;
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diff changeset
297 }
6
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parents: 5
diff changeset
298
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parents: 5
diff changeset
299 if (need_measurement)
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parents: 5
diff changeset
300 {
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parents: 5
diff changeset
301 do_measurement();
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parents: 5
diff changeset
302 }
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parents: 5
diff changeset
303
4
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parents: 3
diff changeset
304 idle_sleep();
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parents: 3
diff changeset
305 }
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parents: 3
diff changeset
306
6
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parents: 5
diff changeset
307 uart_off();
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parents: 5
diff changeset
308
4
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parents: 3
diff changeset
309 // turn off bluetooth
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parents: 3
diff changeset
310 }
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parents: 3
diff changeset
311
7
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parents: 6
diff changeset
312 static void
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parents: 6
diff changeset
313 blink()
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parents: 6
diff changeset
314 {
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parents: 6
diff changeset
315 PORT_LED &= ~_BV(PIN_LED);
9
7da9a3f23592 Import ds18x20 code
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parents: 8
diff changeset
316 _delay_ms(1);
7
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parents: 6
diff changeset
317 PORT_LED |= _BV(PIN_LED);
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parents: 6
diff changeset
318 }
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parents: 6
diff changeset
319
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parents: 6
diff changeset
320 static void
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parents: 6
diff changeset
321 long_delay(int ms)
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parents: 6
diff changeset
322 {
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parents: 6
diff changeset
323 int iter = ms / 100;
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parents: 6
diff changeset
324
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parents: 6
diff changeset
325 for (int i = 0; i < iter; i++)
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parents: 6
diff changeset
326 {
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parents: 6
diff changeset
327 _delay_ms(100);
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parents: 6
diff changeset
328 }
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parents: 6
diff changeset
329 }
52cb08a01171 serial prints something
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parents: 6
diff changeset
330
8
c55321727d02 deep sleep works
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parents: 7
diff changeset
331 ISR(BADISR_vect)
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parents: 7
diff changeset
332 {
c55321727d02 deep sleep works
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parents: 7
diff changeset
333 uart_on();
c55321727d02 deep sleep works
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334 printf_P(PSTR("Bad interrupt\n"));
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335 }
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336
9
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337 static void
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338 set_2mhz()
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339 {
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340 cli();
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341 CLKPR = _BV(CLKPCE);
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342 // divide by 4
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343 CLKPR = _BV(CLKPS1);
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344 sei();
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345 }
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346
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347 static void
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348 test1wire()
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349 {
10
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350 //ow_reset();
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351
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352 uint8_t ret = DS18X20_start_meas( DS18X20_POWER_PARASITE, NULL);
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353 printf("ret %d\n", ret);
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354 _delay_ms(DS18B20_TCONV_12BIT);
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355 DS18X20_read_meas_all_verbose();
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356 }
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357
0
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358 int main(void)
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359 {
9
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360 set_2mhz();
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361
7
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362 DDR_LED |= _BV(PIN_LED);
8
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363 blink();
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364
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365 stdout = &mystdout;
7
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366 uart_on();
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367
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368 fprintf_P(&mystdout, PSTR("hello %d\n"), 12);
8
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369 uart_off();
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370
6
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371 // turn off everything except timer2
8
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372 //PRR = _BV(PRTWI) | _BV(PRTIM0) | _BV(PRTIM1) | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC);
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373
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374 // for testing
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375 uart_on();
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376
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377 //sei();
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378
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379 for (;;)
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380 {
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381 test1wire();
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382 long_delay(2000);
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383 }
0
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384
1
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385 // set up counter2.
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386 // COM21 COM20 Set OC2 on Compare Match (p116)
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387 // WGM21 Clear counter on compare
8
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388 TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21);
1
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389 // CS22 CS21 CS20 clk/1024
2
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390 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20);
1
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391 // set async mode
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392 ASSR |= _BV(AS2);
8
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393 // interrupt
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394 TIMSK2 = _BV(OCIE2A);
0
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395
6
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396 #ifdef TEST_MODE
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397 for (;;)
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398 {
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399 do_comms()
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400 }
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401 #else
0
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402 for(;;){
9
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403
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404 test1wire();
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405
0
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406 /* insert your main loop code here */
1
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407 if (need_measurement)
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408 {
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409 do_measurement();
4
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410 continue;
1
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411 }
4
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412
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413 if (need_comms)
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414 {
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415 do_comms();
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416 continue;
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417 }
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418
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419 deep_sleep();
9
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420 blink();
10
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421 printf(".");
0
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422 }
6
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423 #endif
0
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424 return 0; /* never reached */
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425 }