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annotate main.c @ 12:3c27bfbd7f3a
Add simple_ds18b20.c etc
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sat, 19 May 2012 21:47:09 +0800 |
| parents | 1bfe28c348dd |
| children | 4838bfcb3504 |
| rev | line source |
|---|---|
| 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> | |
| 7 | 12 #include <util/delay.h> |
| 6 | 13 #include <avr/pgmspace.h> |
| 0 | 14 #include <util/crc16.h> |
| 15 | |
| 12 | 16 // for DWORD of get_fattime() |
| 3 | 17 #include "integer.h" |
| 12 | 18 |
| 19 #include "simple_ds18b20.h" | |
| 3 | 20 |
| 0 | 21 // configuration params |
| 22 // - measurement interval | |
| 23 // - transmit interval | |
| 24 // - bluetooth params | |
| 25 // - number of sensors (and range?) | |
| 26 | |
| 1 | 27 // 1 second. we have 1024 prescaler, 32768 crystal. |
| 2 | 28 #define SLEEP_COMPARE 32 |
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29 #define MEASURE_WAKE 60 |
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30 |
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31 #define COMMS_WAKE 3600 |
| 2 | 32 |
| 10 | 33 #define BAUD 19200 |
| 7 | 34 #define UBRR ((F_CPU)/8/(BAUD)-1) |
| 35 | |
| 36 #define PORT_LED PORTC | |
| 37 #define DDR_LED DDRC | |
| 38 #define PIN_LED PC4 | |
| 1 | 39 |
| 6 | 40 #define NUM_MEASUREMENTS 300 |
| 41 | |
| 10 | 42 int uart_putchar(char c, FILE *stream); |
| 0 | 43 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
| 44 _FDEV_SETUP_WRITE); | |
| 45 | |
| 7 | 46 static uint8_t n_measurements = 0; |
| 6 | 47 // stored as 1/5 degree above 0 |
| 48 static uint8_t measurements[NUM_MEASUREMENTS]; | |
| 49 static uint8_t internal_measurements[NUM_MEASUREMENTS]; | |
| 0 | 50 |
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51 // boolean flags |
| 7 | 52 static uint8_t need_measurement = 0; |
| 53 static uint8_t need_comms = 0; | |
| 54 static uint8_t comms_done = 0; | |
| 1 | 55 |
| 7 | 56 static uint8_t readpos = 0; |
| 0 | 57 static char readbuf[30]; |
| 58 | |
| 7 | 59 static uint8_t measure_count = 0; |
| 60 static uint16_t comms_count = 0; | |
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61 |
| 8 | 62 #define DEBUG(str) printf_P(PSTR(str)) |
| 63 | |
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64 static void deep_sleep(); |
| 1 | 65 |
| 0 | 66 static void |
| 7 | 67 uart_on() |
| 0 | 68 { |
| 8 | 69 // Power reduction register |
| 70 //PRR &= ~_BV(PRUSART0); | |
| 71 | |
| 0 | 72 // baud rate |
| 7 | 73 UBRR0H = (unsigned char)(UBRR >> 8); |
| 74 UBRR0L = (unsigned char)UBRR; | |
| 75 // set 2x clock, improves accuracy of UBRR | |
| 76 UCSR0A |= _BV(U2X0); | |
| 6 | 77 UCSR0B = _BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0); |
| 0 | 78 //8N1 |
| 7 | 79 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); |
| 6 | 80 } |
| 81 | |
| 82 static void | |
| 83 uart_off() | |
| 84 { | |
| 85 // Turn of interrupts and disable tx/rx | |
| 86 UCSR0B = 0; | |
| 87 | |
| 88 // Power reduction register | |
| 8 | 89 //PRR |= _BV(PRUSART0); |
| 0 | 90 } |
| 91 | |
| 10 | 92 int |
| 0 | 93 uart_putchar(char c, FILE *stream) |
| 94 { | |
| 10 | 95 // XXX should sleep in the loop for power. |
| 8 | 96 if (c == '\n') |
| 97 { | |
| 10 | 98 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 99 UDR0 = '\r';; | |
| 8 | 100 } |
| 2 | 101 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 102 UDR0 = c; | |
| 10 | 103 if (c == '\r') |
| 104 { | |
| 105 loop_until_bit_is_set(UCSR0A, UDRE0); | |
| 106 UDR0 = '\n';; | |
| 107 } | |
| 0 | 108 return 0; |
| 109 } | |
| 110 | |
| 111 static void | |
| 112 cmd_fetch() | |
| 113 { | |
| 114 uint16_t crc = 0; | |
| 115 int i; | |
| 6 | 116 printf_P(PSTR("%d measurements\n"), n_measurements); |
| 0 | 117 for (i = 0; i < n_measurements; i++) |
| 118 { | |
| 6 | 119 printf_P(PSTR("%3d : %d\n"), i, measurements[i]); |
| 1 | 120 crc = _crc_ccitt_update(crc, measurements[i]); |
| 0 | 121 } |
| 6 | 122 printf_P(PSTR("CRC : %d\n"), crc); |
| 0 | 123 } |
| 124 | |
| 125 static void | |
| 126 cmd_clear() | |
| 127 { | |
| 7 | 128 n_measurements = 0; |
| 129 printf_P(PSTR("Cleared\n")); | |
| 0 | 130 } |
| 131 | |
| 132 static void | |
| 133 cmd_btoff() | |
| 134 { | |
| 7 | 135 printf_P(PSTR("Turning off\n")); |
| 136 _delay_ms(50); | |
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137 comms_done = 1; |
| 0 | 138 } |
| 139 | |
| 140 static void | |
| 12 | 141 cmd_measure() |
| 142 { | |
| 143 printf_P(PSTR("Measuring\n")); | |
| 144 need_measurement = 1; | |
| 145 } | |
| 146 | |
| 147 static void | |
| 148 cmd_sensors() | |
| 149 { | |
| 150 uint8_t ret = simple_ds18b20_start_meas(NULL); | |
| 151 printf("All sensors, ret %d, waiting...\n", ret); | |
| 152 _delay_ms(DS18B20_TCONV_12BIT); | |
| 153 simple_ds18b20_read_all(); | |
| 154 } | |
| 155 | |
| 156 static void | |
| 0 | 157 read_handler() |
| 158 { | |
| 6 | 159 if (strcmp_P(readbuf, PSTR("fetch")) == 0) |
| 0 | 160 { |
| 161 cmd_fetch(); | |
| 162 } | |
| 6 | 163 else if (strcmp_P(readbuf, PSTR("clear")) == 0) |
| 0 | 164 { |
| 165 cmd_clear(); | |
| 166 } | |
| 6 | 167 else if (strcmp_P(readbuf, PSTR("btoff")) == 0) |
| 0 | 168 { |
| 169 cmd_btoff(); | |
| 170 } | |
| 12 | 171 else if (strcmp_P(readbuf, PSTR("measure")) == 0) |
| 172 { | |
| 173 cmd_measure(); | |
| 174 } | |
| 175 else if (strcmp_P(readbuf, PSTR("sensors")) == 0) | |
| 176 { | |
| 177 cmd_sensors(); | |
| 178 } | |
| 0 | 179 else |
| 180 { | |
| 6 | 181 printf_P(PSTR("Bad command\n")); |
| 0 | 182 } |
| 183 } | |
| 184 | |
| 2 | 185 ISR(USART_RX_vect) |
| 0 | 186 { |
| 2 | 187 char c = UDR0; |
| 12 | 188 uart_putchar(c, NULL); |
| 189 if (c == '\r') | |
| 0 | 190 { |
| 191 readbuf[readpos] = '\0'; | |
| 192 read_handler(); | |
| 193 readpos = 0; | |
| 194 } | |
| 195 else | |
| 196 { | |
| 197 readbuf[readpos] = c; | |
| 198 readpos++; | |
| 199 if (readpos >= sizeof(readbuf)) | |
| 200 { | |
| 201 readpos = 0; | |
| 202 } | |
| 203 } | |
| 204 } | |
| 205 | |
| 2 | 206 ISR(TIMER2_COMPA_vect) |
| 1 | 207 { |
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208 measure_count ++; |
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209 comms_count ++; |
| 12 | 210 printf("measure_count %d\n", measure_count); |
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211 if (measure_count == MEASURE_WAKE) |
| 1 | 212 { |
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213 measure_count = 0; |
| 12 | 214 printf("need_measurement = 1\n"); |
| 1 | 215 need_measurement = 1; |
| 216 } | |
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217 |
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218 if (comms_count == COMMS_WAKE) |
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219 { |
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220 comms_count = 0; |
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221 need_comms = 1; |
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222 } |
| 1 | 223 } |
| 224 | |
| 3 | 225 DWORD get_fattime (void) |
| 226 { | |
| 227 return 0; | |
| 228 } | |
| 229 | |
| 1 | 230 static void |
| 231 deep_sleep() | |
| 232 { | |
| 233 // p119 of manual | |
| 2 | 234 OCR2A = SLEEP_COMPARE; |
| 235 loop_until_bit_is_clear(ASSR, OCR2AUB); | |
| 1 | 236 |
| 237 set_sleep_mode(SLEEP_MODE_PWR_SAVE); | |
| 238 sleep_mode(); | |
| 239 } | |
| 240 | |
| 241 static void | |
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242 idle_sleep() |
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243 { |
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244 set_sleep_mode(SLEEP_MODE_IDLE); |
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245 sleep_mode(); |
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246 } |
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247 |
| 6 | 248 static void |
| 249 do_adc_335() | |
| 250 { | |
| 8 | 251 //PRR &= ~_BV(PRADC); |
| 6 | 252 |
| 253 ADMUX = _BV(ADLAR); | |
| 254 | |
| 255 // ADPS2 = /16 prescaler, 62khz at 1mhz clock | |
| 256 ADCSRA = _BV(ADEN) | _BV(ADPS2); | |
| 257 | |
| 258 // measure value | |
| 259 ADCSRA |= _BV(ADSC); | |
| 260 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 261 uint8_t low = ADCL; | |
| 262 uint8_t high = ADCH; | |
| 263 uint16_t f_measure = low + (high << 8); | |
| 264 | |
| 265 // set to measure 1.1 reference | |
| 266 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); | |
| 267 ADCSRA |= _BV(ADSC); | |
| 268 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 269 uint8_t low_11 = ADCL; | |
| 270 uint8_t high_11 = ADCH; | |
| 271 uint16_t f_11 = low_11 + (high_11 << 8); | |
| 272 | |
| 273 float res_volts = 1.1 * f_measure / f_11; | |
| 274 | |
| 275 // 10mV/degree | |
| 276 // scale to 1/5 degree units above 0C | |
| 277 int temp = (res_volts - 2.73) * 500; | |
| 278 measurements[n_measurements] = temp; | |
| 279 // XXX something if it hits the limit | |
| 280 | |
| 281 // measure AVR internal temperature against 1.1 ref. | |
| 282 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(REFS1) | _BV(REFS0); | |
| 283 ADCSRA |= _BV(ADSC); | |
| 284 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 285 uint16_t res_internal = ADCL; | |
| 286 res_internal |= ADCH << 8; | |
| 287 | |
| 288 float internal_volts = res_internal * (1.1 / 1024.0); | |
| 289 | |
| 290 // 1mV/degree | |
| 291 int internal_temp = (internal_volts - 2.73) * 5000; | |
| 292 internal_measurements[n_measurements] = internal_temp; | |
| 293 | |
| 294 printf_P("measure %d: external %d, internal %d, 1.1 %d\n", | |
| 295 n_measurements, temp, internal_temp, f_11); | |
| 296 | |
| 297 n_measurements++; | |
| 8 | 298 //PRR |= _BV(PRADC); |
| 6 | 299 } |
| 300 | |
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301 static void |
| 1 | 302 do_measurement() |
| 303 { | |
| 12 | 304 printf("do_measurement\n"); |
| 1 | 305 need_measurement = 0; |
| 6 | 306 |
| 12 | 307 //do_adc_335(); |
| 1 | 308 } |
| 309 | |
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310 static void |
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311 do_comms() |
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312 { |
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313 need_comms = 0; |
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314 |
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315 // turn on bluetooth |
| 7 | 316 uart_on(); |
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317 |
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318 // write sd card here? same 3.3v regulator... |
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319 |
| 12 | 320 printf("ready> \n"); |
| 321 | |
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322 comms_done = 0; |
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323 for (;;) |
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324 { |
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325 if (comms_done) |
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326 { |
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327 break; |
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328 } |
| 6 | 329 |
| 330 if (need_measurement) | |
| 331 { | |
| 332 do_measurement(); | |
| 333 } | |
| 334 | |
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335 idle_sleep(); |
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336 } |
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337 |
| 6 | 338 uart_off(); |
| 339 | |
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340 // turn off bluetooth |
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341 } |
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342 |
| 7 | 343 static void |
| 344 blink() | |
| 345 { | |
| 346 PORT_LED &= ~_BV(PIN_LED); | |
| 9 | 347 _delay_ms(1); |
| 7 | 348 PORT_LED |= _BV(PIN_LED); |
| 349 } | |
| 350 | |
| 351 static void | |
| 352 long_delay(int ms) | |
| 353 { | |
| 354 int iter = ms / 100; | |
| 355 | |
| 356 for (int i = 0; i < iter; i++) | |
| 357 { | |
| 358 _delay_ms(100); | |
| 359 } | |
| 360 } | |
| 361 | |
| 8 | 362 ISR(BADISR_vect) |
| 363 { | |
| 364 uart_on(); | |
| 365 printf_P(PSTR("Bad interrupt\n")); | |
| 366 } | |
| 367 | |
| 9 | 368 static void |
| 369 set_2mhz() | |
| 370 { | |
| 371 cli(); | |
| 372 CLKPR = _BV(CLKPCE); | |
| 373 // divide by 4 | |
| 374 CLKPR = _BV(CLKPS1); | |
| 375 sei(); | |
| 376 } | |
| 377 | |
| 378 static void | |
| 12 | 379 dump_ds18x20() |
| 9 | 380 { |
| 381 } | |
| 382 | |
| 0 | 383 int main(void) |
| 384 { | |
| 9 | 385 set_2mhz(); |
| 386 | |
| 7 | 387 DDR_LED |= _BV(PIN_LED); |
| 8 | 388 blink(); |
| 7 | 389 |
| 6 | 390 stdout = &mystdout; |
| 7 | 391 uart_on(); |
| 392 | |
| 6 | 393 fprintf_P(&mystdout, PSTR("hello %d\n"), 12); |
| 8 | 394 uart_off(); |
| 0 | 395 |
| 6 | 396 // turn off everything except timer2 |
| 8 | 397 //PRR = _BV(PRTWI) | _BV(PRTIM0) | _BV(PRTIM1) | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC); |
| 398 | |
| 399 // for testing | |
| 400 uart_on(); | |
| 401 | |
| 12 | 402 sei(); |
| 8 | 403 |
| 12 | 404 #if 0 |
| 1 | 405 // set up counter2. |
| 406 // COM21 COM20 Set OC2 on Compare Match (p116) | |
| 407 // WGM21 Clear counter on compare | |
| 8 | 408 TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); |
| 1 | 409 // CS22 CS21 CS20 clk/1024 |
| 2 | 410 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20); |
| 1 | 411 // set async mode |
| 412 ASSR |= _BV(AS2); | |
| 8 | 413 // interrupt |
| 414 TIMSK2 = _BV(OCIE2A); | |
| 12 | 415 #endif |
| 0 | 416 |
| 6 | 417 for (;;) |
| 418 { | |
| 12 | 419 do_comms(); |
| 6 | 420 } |
| 12 | 421 |
| 0 | 422 for(;;){ |
| 423 /* insert your main loop code here */ | |
| 1 | 424 if (need_measurement) |
| 425 { | |
| 426 do_measurement(); | |
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427 continue; |
| 1 | 428 } |
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429 |
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430 if (need_comms) |
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431 { |
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432 do_comms(); |
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433 continue; |
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parents:
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434 } |
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parents:
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435 |
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436 deep_sleep(); |
| 9 | 437 blink(); |
| 10 | 438 printf("."); |
| 0 | 439 } |
| 12 | 440 |
| 0 | 441 return 0; /* never reached */ |
| 442 } |