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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/crc16.h> |
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13 |
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14 #include "integer.h" |
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15 |
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16 // configuration params |
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17 // - measurement interval |
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18 // - transmit interval |
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19 // - bluetooth params |
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20 // - number of sensors (and range?) |
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21 |
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22 // 1 second. we have 1024 prescaler, 32768 crystal. |
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23 #define SLEEP_COMPARE 32 |
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24 #define SECONDS_WAKE 60 |
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25 |
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26 #define BAUD 9600 |
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27 #define UBRR ((F_CPU)/16/(BAUD)-1) |
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28 |
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29 static int uart_putchar(char c, FILE *stream); |
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30 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
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31 _FDEV_SETUP_WRITE); |
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32 |
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33 static uint8_t n_measurements; |
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34 static uint8_t measurements[500]; |
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35 |
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36 static uint8_t need_measurement; |
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37 |
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38 static uint8_t readpos; |
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39 static char readbuf[30]; |
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40 |
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41 static uint8_t sec_count; |
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42 |
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43 static void |
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44 uart_init(unsigned int ubrr) |
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45 { |
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46 // baud rate |
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47 UBRR0H = (unsigned char)(ubrr >> 8); |
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48 UBRR0L = (unsigned char)ubrr; |
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49 UCSR0B = (1<<RXEN0)|(1<<TXEN0); |
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50 //8N1 |
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51 UCSR0C = (1<<UMSEL00)|(3<<UCSZ00); |
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52 } |
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53 |
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54 static int |
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55 uart_putchar(char c, FILE *stream) |
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56 { |
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57 // XXX should sleep in the loop for power. |
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58 loop_until_bit_is_set(UCSR0A, UDRE0); |
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59 UDR0 = c; |
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60 return 0; |
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61 } |
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62 |
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63 static void |
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64 cmd_fetch() |
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65 { |
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66 uint16_t crc = 0; |
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67 int i; |
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68 printf("%d measurements\n", n_measurements); |
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69 for (i = 0; i < n_measurements; i++) |
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70 { |
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71 printf("%3d : %d\n", i, measurements[i]); |
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72 crc = _crc_ccitt_update(crc, measurements[i]); |
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73 } |
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74 printf("CRC : %d\n", crc); |
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75 } |
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76 |
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77 static void |
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78 cmd_clear() |
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79 { |
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80 } |
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81 |
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82 static void |
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83 cmd_btoff() |
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84 { |
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85 } |
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86 |
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87 static void |
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88 read_handler() |
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89 { |
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90 if (strcmp(readbuf, "fetch") == 0) |
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91 { |
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92 cmd_fetch(); |
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93 } |
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94 else if (strcmp(readbuf, "clear") == 0) |
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95 { |
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96 cmd_clear(); |
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97 } |
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98 else if (strcmp(readbuf, "btoff") == 0) |
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99 { |
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100 cmd_btoff(); |
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101 } |
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102 else |
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103 { |
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104 printf("Bad command\n"); |
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105 } |
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106 } |
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107 |
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108 ISR(USART_RX_vect) |
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109 { |
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110 char c = UDR0; |
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111 if (c == '\n') |
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112 { |
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113 readbuf[readpos] = '\0'; |
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114 read_handler(); |
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115 readpos = 0; |
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116 } |
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117 else |
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118 { |
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119 readbuf[readpos] = c; |
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120 readpos++; |
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121 if (readpos >= sizeof(readbuf)) |
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122 { |
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123 readpos = 0; |
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124 } |
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125 } |
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126 } |
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127 |
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128 ISR(TIMER2_COMPA_vect) |
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129 { |
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130 sec_count ++; |
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131 if (sec_count == SECONDS_WAKE) |
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132 { |
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133 sec_count = 0; |
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134 need_measurement = 1; |
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135 } |
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136 } |
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137 |
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138 DWORD get_fattime (void) |
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139 { |
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140 return 0; |
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141 } |
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142 |
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143 static void |
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144 deep_sleep() |
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145 { |
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146 // p119 of manual |
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147 OCR2A = SLEEP_COMPARE; |
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148 loop_until_bit_is_clear(ASSR, OCR2AUB); |
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149 |
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150 set_sleep_mode(SLEEP_MODE_PWR_SAVE); |
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151 sleep_mode(); |
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152 } |
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153 |
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154 static void |
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155 do_measurement() |
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156 { |
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157 need_measurement = 0; |
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158 } |
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159 |
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160 int main(void) |
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161 { |
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162 uart_init(UBRR); |
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163 |
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164 fprintf(&mystdout, "hello %d\n", 12); |
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165 |
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166 // set up counter2. |
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167 // COM21 COM20 Set OC2 on Compare Match (p116) |
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168 // WGM21 Clear counter on compare |
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169 // CS22 CS21 CS20 clk/1024 |
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170 TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); |
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171 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20); |
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172 // set async mode |
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173 ASSR |= _BV(AS2); |
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174 |
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175 for(;;){ |
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176 /* insert your main loop code here */ |
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177 if (need_measurement) |
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178 { |
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179 do_measurement(); |
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180 } |
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181 } |
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182 return 0; /* never reached */ |
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183 } |
