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