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annotate main.c @ 5:011160e5b1ce
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| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Fri, 11 May 2012 22:12:11 +0800 |
| parents | 54d369e3d689 |
| children | 9d538f674ff0 |
| rev | line source |
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| 0 | 1 /* Name: main.c |
| 2 * Author: <insert your name here> | |
| 3 * Copyright: <insert your copyright message here> | |
| 4 * License: <insert your license reference here> | |
| 5 */ | |
| 6 | |
| 7 #include <stdio.h> | |
| 8 #include <string.h> | |
| 1 | 9 #include <avr/io.h> |
| 10 #include <avr/interrupt.h> | |
| 11 #include <avr/sleep.h> | |
| 0 | 12 #include <util/crc16.h> |
| 13 | |
| 3 | 14 #include "integer.h" |
| 15 | |
| 0 | 16 // configuration params |
| 17 // - measurement interval | |
| 18 // - transmit interval | |
| 19 // - bluetooth params | |
| 20 // - number of sensors (and range?) | |
| 21 | |
| 1 | 22 // 1 second. we have 1024 prescaler, 32768 crystal. |
| 2 | 23 #define SLEEP_COMPARE 32 |
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24 #define MEASURE_WAKE 60 |
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25 |
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26 #define COMMS_WAKE 3600 |
| 2 | 27 |
| 28 #define BAUD 9600 | |
| 29 #define UBRR ((F_CPU)/16/(BAUD)-1) | |
| 1 | 30 |
| 0 | 31 static int uart_putchar(char c, FILE *stream); |
| 32 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, | |
| 33 _FDEV_SETUP_WRITE); | |
| 34 | |
| 35 static uint8_t n_measurements; | |
| 36 static uint8_t measurements[500]; | |
| 37 | |
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38 // boolean flags |
| 1 | 39 static uint8_t need_measurement; |
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40 static uint8_t need_comms; |
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41 static uint8_t comms_done; |
| 1 | 42 |
| 0 | 43 static uint8_t readpos; |
| 44 static char readbuf[30]; | |
| 45 | |
| 5 | 46 static uint8_t measure_count; |
| 47 static uint16_t comms_count; | |
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48 |
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49 static void deep_sleep(); |
| 1 | 50 |
| 0 | 51 static void |
| 2 | 52 uart_init(unsigned int ubrr) |
| 0 | 53 { |
| 54 // baud rate | |
| 2 | 55 UBRR0H = (unsigned char)(ubrr >> 8); |
| 56 UBRR0L = (unsigned char)ubrr; | |
| 57 UCSR0B = (1<<RXEN0)|(1<<TXEN0); | |
| 0 | 58 //8N1 |
| 2 | 59 UCSR0C = (1<<UMSEL00)|(3<<UCSZ00); |
| 0 | 60 } |
| 61 | |
| 62 static int | |
| 63 uart_putchar(char c, FILE *stream) | |
| 64 { | |
| 65 // XXX should sleep in the loop for power. | |
| 2 | 66 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 67 UDR0 = c; | |
| 0 | 68 return 0; |
| 69 } | |
| 70 | |
| 71 static void | |
| 72 cmd_fetch() | |
| 73 { | |
| 74 uint16_t crc = 0; | |
| 75 int i; | |
| 76 printf("%d measurements\n", n_measurements); | |
| 77 for (i = 0; i < n_measurements; i++) | |
| 78 { | |
| 79 printf("%3d : %d\n", i, measurements[i]); | |
| 1 | 80 crc = _crc_ccitt_update(crc, measurements[i]); |
| 0 | 81 } |
| 1 | 82 printf("CRC : %d\n", crc); |
| 0 | 83 } |
| 84 | |
| 85 static void | |
| 86 cmd_clear() | |
| 87 { | |
| 88 } | |
| 89 | |
| 90 static void | |
| 91 cmd_btoff() | |
| 92 { | |
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93 comms_done = 1; |
| 0 | 94 } |
| 95 | |
| 96 static void | |
| 97 read_handler() | |
| 98 { | |
| 99 if (strcmp(readbuf, "fetch") == 0) | |
| 100 { | |
| 101 cmd_fetch(); | |
| 102 } | |
| 103 else if (strcmp(readbuf, "clear") == 0) | |
| 104 { | |
| 105 cmd_clear(); | |
| 106 } | |
| 107 else if (strcmp(readbuf, "btoff") == 0) | |
| 108 { | |
| 109 cmd_btoff(); | |
| 110 } | |
| 111 else | |
| 112 { | |
| 113 printf("Bad command\n"); | |
| 114 } | |
| 115 } | |
| 116 | |
| 2 | 117 ISR(USART_RX_vect) |
| 0 | 118 { |
| 2 | 119 char c = UDR0; |
| 0 | 120 if (c == '\n') |
| 121 { | |
| 122 readbuf[readpos] = '\0'; | |
| 123 read_handler(); | |
| 124 readpos = 0; | |
| 125 } | |
| 126 else | |
| 127 { | |
| 128 readbuf[readpos] = c; | |
| 129 readpos++; | |
| 130 if (readpos >= sizeof(readbuf)) | |
| 131 { | |
| 132 readpos = 0; | |
| 133 } | |
| 134 } | |
| 135 } | |
| 136 | |
| 2 | 137 ISR(TIMER2_COMPA_vect) |
| 1 | 138 { |
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139 measure_count ++; |
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140 comms_count ++; |
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141 if (measure_count == MEASURE_WAKE) |
| 1 | 142 { |
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143 measure_count = 0; |
| 1 | 144 need_measurement = 1; |
| 145 } | |
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146 |
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147 if (comms_count == COMMS_WAKE) |
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148 { |
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149 comms_count = 0; |
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150 need_comms = 1; |
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151 } |
| 1 | 152 } |
| 153 | |
| 3 | 154 DWORD get_fattime (void) |
| 155 { | |
| 156 return 0; | |
| 157 } | |
| 158 | |
| 1 | 159 static void |
| 160 deep_sleep() | |
| 161 { | |
| 162 // p119 of manual | |
| 2 | 163 OCR2A = SLEEP_COMPARE; |
| 164 loop_until_bit_is_clear(ASSR, OCR2AUB); | |
| 1 | 165 |
| 166 set_sleep_mode(SLEEP_MODE_PWR_SAVE); | |
| 167 sleep_mode(); | |
| 168 } | |
| 169 | |
| 170 static void | |
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171 idle_sleep() |
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172 { |
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173 set_sleep_mode(SLEEP_MODE_IDLE); |
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174 sleep_mode(); |
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175 } |
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176 |
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177 static void |
| 1 | 178 do_measurement() |
| 179 { | |
| 180 need_measurement = 0; | |
| 181 } | |
| 182 | |
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183 static void |
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184 do_comms() |
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185 { |
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186 need_comms = 0; |
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187 |
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188 // turn on bluetooth |
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189 // turn on serial (interrupts) |
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190 |
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191 // write sd card here? same 3.3v regulator... |
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192 |
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193 comms_done = 0; |
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194 for (;;) |
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195 { |
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196 if (comms_done) |
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197 { |
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198 break; |
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199 } |
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200 idle_sleep(); |
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201 } |
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202 |
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203 // turn off bluetooth |
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204 // turn off serial (interrupts) |
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205 } |
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206 |
| 0 | 207 int main(void) |
| 208 { | |
| 2 | 209 uart_init(UBRR); |
| 0 | 210 |
| 211 fprintf(&mystdout, "hello %d\n", 12); | |
| 212 | |
| 1 | 213 // set up counter2. |
| 214 // COM21 COM20 Set OC2 on Compare Match (p116) | |
| 215 // WGM21 Clear counter on compare | |
| 216 // CS22 CS21 CS20 clk/1024 | |
| 2 | 217 TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); |
| 218 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20); | |
| 1 | 219 // set async mode |
| 220 ASSR |= _BV(AS2); | |
| 0 | 221 |
| 222 for(;;){ | |
| 223 /* insert your main loop code here */ | |
| 1 | 224 if (need_measurement) |
| 225 { | |
| 226 do_measurement(); | |
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227 continue; |
| 1 | 228 } |
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229 |
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230 if (need_comms) |
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231 { |
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232 do_comms(); |
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233 continue; |
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234 } |
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235 |
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236 deep_sleep(); |
| 0 | 237 } |
| 238 return 0; /* never reached */ | |
| 239 } |