Mercurial > templog
annotate main.c @ 14:426fb44ece3f
Lots of it works now.
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sun, 20 May 2012 00:36:52 +0800 |
| parents | 4838bfcb3504 |
| children | 54b0fda9cba7 |
| 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> | |
| 13 | 9 #include <stddef.h> |
| 1 | 10 #include <avr/io.h> |
| 11 #include <avr/interrupt.h> | |
| 12 #include <avr/sleep.h> | |
| 7 | 13 #include <util/delay.h> |
| 6 | 14 #include <avr/pgmspace.h> |
| 13 | 15 #include <avr/eeprom.h> |
| 0 | 16 #include <util/crc16.h> |
| 17 | |
| 12 | 18 // for DWORD of get_fattime() |
| 3 | 19 #include "integer.h" |
| 12 | 20 |
| 21 #include "simple_ds18b20.h" | |
| 13 | 22 #include "onewire.h" |
| 3 | 23 |
| 0 | 24 // configuration params |
| 25 // - measurement interval | |
| 26 // - transmit interval | |
| 27 // - bluetooth params | |
| 28 // - number of sensors (and range?) | |
| 29 | |
| 1 | 30 // 1 second. we have 1024 prescaler, 32768 crystal. |
| 2 | 31 #define SLEEP_COMPARE 32 |
| 14 | 32 #define MEASURE_WAKE 10 |
|
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33 |
| 13 | 34 #define VALUE_NOSENSOR -9000 |
| 35 #define VALUE_BROKEN -8000 | |
| 36 | |
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37 #define COMMS_WAKE 3600 |
| 2 | 38 |
| 10 | 39 #define BAUD 19200 |
| 7 | 40 #define UBRR ((F_CPU)/8/(BAUD)-1) |
| 41 | |
| 42 #define PORT_LED PORTC | |
| 43 #define DDR_LED DDRC | |
| 44 #define PIN_LED PC4 | |
| 1 | 45 |
| 13 | 46 #define NUM_MEASUREMENTS 100 |
| 47 #define MAX_SENSORS 5 | |
| 6 | 48 |
| 10 | 49 int uart_putchar(char c, FILE *stream); |
| 14 | 50 static void long_delay(int ms); |
| 51 | |
| 0 | 52 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
| 53 _FDEV_SETUP_WRITE); | |
| 54 | |
| 13 | 55 static uint16_t n_measurements = 0; |
| 56 // stored as decidegrees | |
| 14 | 57 static int16_t measurements[NUM_MEASUREMENTS][MAX_SENSORS]; |
| 0 | 58 |
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59 // boolean flags |
| 7 | 60 static uint8_t need_measurement = 0; |
| 61 static uint8_t need_comms = 0; | |
| 62 static uint8_t comms_done = 0; | |
| 1 | 63 |
| 7 | 64 static uint8_t readpos = 0; |
| 0 | 65 static char readbuf[30]; |
| 66 | |
| 7 | 67 static uint8_t measure_count = 0; |
| 68 static uint16_t comms_count = 0; | |
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69 |
| 13 | 70 // thanks to http://projectgus.com/2010/07/eeprom-access-with-arduino/ |
| 71 #define eeprom_read_to(dst_p, eeprom_field, dst_size) eeprom_read_block((dst_p), (void *)offsetof(struct __eeprom_data, eeprom_field), (dst_size)) | |
| 72 #define eeprom_read(dst, eeprom_field) eeprom_read_to((&dst), eeprom_field, sizeof(dst)) | |
| 73 #define eeprom_write_from(src_p, eeprom_field, src_size) eeprom_write_block((src_p), (void *)offsetof(struct __eeprom_data, eeprom_field), (src_size)) | |
| 74 #define eeprom_write(src, eeprom_field) { eeprom_write_from(&src, eeprom_field, sizeof(src)); } | |
| 75 | |
| 76 #define EXPECT_MAGIC 0x67c9 | |
| 77 | |
| 78 struct __attribute__ ((__packed__)) __eeprom_data { | |
| 79 uint16_t magic; | |
| 80 uint8_t n_sensors; | |
| 81 uint8_t sensor_id[MAX_SENSORS][8]; | |
| 82 }; | |
| 83 | |
| 8 | 84 #define DEBUG(str) printf_P(PSTR(str)) |
| 85 | |
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86 static void deep_sleep(); |
| 1 | 87 |
| 0 | 88 static void |
| 7 | 89 uart_on() |
| 0 | 90 { |
| 8 | 91 // Power reduction register |
| 92 //PRR &= ~_BV(PRUSART0); | |
| 93 | |
| 0 | 94 // baud rate |
| 7 | 95 UBRR0H = (unsigned char)(UBRR >> 8); |
| 96 UBRR0L = (unsigned char)UBRR; | |
| 97 // set 2x clock, improves accuracy of UBRR | |
| 98 UCSR0A |= _BV(U2X0); | |
| 6 | 99 UCSR0B = _BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0); |
| 0 | 100 //8N1 |
| 7 | 101 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); |
| 6 | 102 } |
| 103 | |
| 104 static void | |
| 105 uart_off() | |
| 106 { | |
| 107 // Turn of interrupts and disable tx/rx | |
| 108 UCSR0B = 0; | |
| 109 | |
| 110 // Power reduction register | |
| 8 | 111 //PRR |= _BV(PRUSART0); |
| 0 | 112 } |
| 113 | |
| 10 | 114 int |
| 0 | 115 uart_putchar(char c, FILE *stream) |
| 116 { | |
| 10 | 117 // XXX should sleep in the loop for power. |
| 8 | 118 if (c == '\n') |
| 119 { | |
| 10 | 120 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 121 UDR0 = '\r';; | |
| 8 | 122 } |
| 2 | 123 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 124 UDR0 = c; | |
| 10 | 125 if (c == '\r') |
| 126 { | |
| 127 loop_until_bit_is_set(UCSR0A, UDRE0); | |
| 128 UDR0 = '\n';; | |
| 129 } | |
| 0 | 130 return 0; |
| 131 } | |
| 132 | |
| 133 static void | |
| 134 cmd_fetch() | |
| 135 { | |
| 136 uint16_t crc = 0; | |
| 14 | 137 uint8_t sens; |
| 13 | 138 eeprom_read(sens, n_sensors); |
| 139 | |
| 6 | 140 printf_P(PSTR("%d measurements\n"), n_measurements); |
| 14 | 141 for (uint16_t n = 0; n < n_measurements; n++) |
| 0 | 142 { |
| 14 | 143 printf_P(PSTR("%3d :"), n); |
| 13 | 144 for (uint8_t s = 0; s < sens; s++) |
| 145 { | |
| 14 | 146 printf_P(PSTR(" %6d"), measurements[n][s]); |
| 147 crc = _crc_ccitt_update(crc, measurements[n][s]); | |
| 13 | 148 } |
| 149 putchar('\n'); | |
| 0 | 150 } |
| 6 | 151 printf_P(PSTR("CRC : %d\n"), crc); |
| 0 | 152 } |
| 153 | |
| 154 static void | |
| 155 cmd_clear() | |
| 156 { | |
| 7 | 157 n_measurements = 0; |
| 158 printf_P(PSTR("Cleared\n")); | |
| 0 | 159 } |
| 160 | |
| 161 static void | |
| 162 cmd_btoff() | |
| 163 { | |
| 7 | 164 printf_P(PSTR("Turning off\n")); |
| 165 _delay_ms(50); | |
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166 comms_done = 1; |
| 0 | 167 } |
| 168 | |
| 169 static void | |
| 12 | 170 cmd_measure() |
| 171 { | |
| 172 printf_P(PSTR("Measuring\n")); | |
| 173 need_measurement = 1; | |
| 174 } | |
| 175 | |
| 176 static void | |
| 177 cmd_sensors() | |
| 178 { | |
| 179 uint8_t ret = simple_ds18b20_start_meas(NULL); | |
| 14 | 180 printf_P(PSTR("All sensors, ret %d, waiting...\n"), ret); |
| 181 long_delay(DS18B20_TCONV_12BIT); | |
| 12 | 182 simple_ds18b20_read_all(); |
| 183 } | |
| 184 | |
| 13 | 185 // 0 on success |
| 186 static uint8_t | |
| 187 get_hex_string(const char *hex, uint8_t *out, uint8_t size) | |
| 188 { | |
| 189 uint8_t upper; | |
| 190 uint8_t o; | |
| 191 for (uint8_t i = 0, z = 0; o < size; i++) | |
| 192 { | |
| 193 uint8_t h = hex[i]; | |
| 194 if (h >= 'A' && h <= 'F') | |
| 195 { | |
| 196 // lower case | |
| 197 h += 0x20; | |
| 198 } | |
| 199 uint8_t nibble; | |
| 200 if (h >= '0' && h <= '9') | |
| 201 { | |
| 202 nibble = h - '0'; | |
| 203 } | |
| 204 else if (h >= 'a' && h <= 'f') | |
| 205 { | |
| 206 nibble = 10 + h - 'a'; | |
| 207 } | |
| 208 else if (h == ' ' || h == ':') | |
| 209 { | |
| 210 continue; | |
| 211 } | |
| 212 else | |
| 213 { | |
| 214 printf_P(PSTR("Bad hex 0x%x '%c'\n"), hex[i], hex[i]); | |
| 215 return 1; | |
| 216 } | |
| 217 | |
| 218 if (z % 2 == 0) | |
| 219 { | |
| 220 upper = nibble << 4; | |
| 221 } | |
| 222 else | |
| 223 { | |
| 224 out[o] = upper | nibble; | |
| 225 o++; | |
| 226 } | |
| 227 | |
| 228 z++; | |
| 229 } | |
| 230 | |
| 231 if (o != size) | |
| 232 { | |
| 233 printf_P(PSTR("Short hex\n")); | |
| 234 return 1; | |
| 235 } | |
| 236 return 0; | |
| 237 } | |
| 238 | |
| 239 static void | |
| 240 add_sensor(uint8_t *id) | |
| 241 { | |
| 242 uint8_t n; | |
| 243 eeprom_read(n, n_sensors); | |
| 244 if (n < MAX_SENSORS) | |
| 245 { | |
| 246 cli(); | |
| 247 eeprom_write_from(id, sensor_id[n], 8); | |
| 248 n++; | |
| 249 eeprom_write(n, n_sensors); | |
| 250 sei(); | |
| 251 printf_P(PSTR("Added sensor %d : "), n); | |
| 252 printhex(id, 8); | |
| 253 putchar('\n'); | |
| 254 } | |
| 255 else | |
| 256 { | |
| 257 printf_P(PSTR("Too many sensors\n")); | |
| 258 } | |
| 259 } | |
| 260 | |
| 261 static void | |
| 262 cmd_add_all() | |
| 263 { | |
| 264 uint8_t id[OW_ROMCODE_SIZE]; | |
| 265 printf_P("Adding all\n"); | |
| 266 ow_reset(); | |
| 267 for( uint8_t diff = OW_SEARCH_FIRST; diff != OW_LAST_DEVICE; ) | |
| 268 { | |
| 269 diff = ow_rom_search( diff, &id[0] ); | |
| 270 if( diff == OW_PRESENCE_ERR ) { | |
| 271 printf_P( PSTR("No Sensor found\r") ); | |
| 272 return; | |
| 273 } | |
| 274 | |
| 275 if( diff == OW_DATA_ERR ) { | |
| 276 printf_P( PSTR("Bus Error\r") ); | |
| 277 return; | |
| 278 } | |
| 279 add_sensor(id); | |
| 280 } | |
| 281 } | |
| 282 | |
| 283 static void | |
| 284 cmd_add_sensor(const char* hex_addr) | |
| 285 { | |
| 286 uint8_t id[8]; | |
| 287 uint8_t ret = get_hex_string(hex_addr, id, 8); | |
| 288 if (ret) | |
| 289 { | |
| 290 return; | |
| 291 } | |
| 292 add_sensor(id); | |
| 293 | |
| 294 } | |
| 295 | |
| 296 static void | |
| 297 cmd_init() | |
| 298 { | |
| 299 printf_P(PSTR("Resetting sensor list\n")); | |
| 300 uint8_t zero = 0; | |
| 301 cli(); | |
| 302 eeprom_write(zero, n_sensors); | |
| 303 sei(); | |
| 304 printf_P(PSTR("Done.\n")); | |
| 305 } | |
| 306 | |
| 307 static void | |
| 308 check_first_startup() | |
| 309 { | |
| 310 uint16_t magic; | |
| 311 eeprom_read(magic, magic); | |
| 312 if (magic != EXPECT_MAGIC) | |
| 313 { | |
| 314 printf_P(PSTR("First boot, looking for sensors...\n")); | |
| 315 cmd_init(); | |
| 316 cmd_add_all(); | |
| 14 | 317 cli(); |
| 318 magic = EXPECT_MAGIC; | |
| 319 eeprom_write(magic, magic); | |
| 320 sei(); | |
| 13 | 321 } |
| 322 } | |
| 323 | |
| 12 | 324 static void |
| 0 | 325 read_handler() |
| 326 { | |
| 6 | 327 if (strcmp_P(readbuf, PSTR("fetch")) == 0) |
| 0 | 328 { |
| 329 cmd_fetch(); | |
| 330 } | |
| 6 | 331 else if (strcmp_P(readbuf, PSTR("clear")) == 0) |
| 0 | 332 { |
| 333 cmd_clear(); | |
| 334 } | |
| 6 | 335 else if (strcmp_P(readbuf, PSTR("btoff")) == 0) |
| 0 | 336 { |
| 337 cmd_btoff(); | |
| 338 } | |
| 12 | 339 else if (strcmp_P(readbuf, PSTR("measure")) == 0) |
| 340 { | |
| 341 cmd_measure(); | |
| 342 } | |
| 343 else if (strcmp_P(readbuf, PSTR("sensors")) == 0) | |
| 344 { | |
| 345 cmd_sensors(); | |
| 346 } | |
| 13 | 347 else if (strncmp_P(readbuf, PSTR("adds "), strlen("adds ")) == 0) |
| 348 { | |
| 349 cmd_add_sensor(readbuf + strlen("adds ")); | |
| 350 } | |
| 351 else if (strcmp_P(readbuf, PSTR("addall"))== 0) | |
| 352 { | |
| 353 cmd_add_all(); | |
| 354 } | |
| 355 else if (strcmp_P(readbuf, PSTR("init")) == 0) | |
| 356 { | |
| 357 cmd_init(); | |
| 358 } | |
| 0 | 359 else |
| 360 { | |
| 6 | 361 printf_P(PSTR("Bad command\n")); |
| 0 | 362 } |
| 363 } | |
| 364 | |
| 2 | 365 ISR(USART_RX_vect) |
| 0 | 366 { |
| 2 | 367 char c = UDR0; |
| 12 | 368 uart_putchar(c, NULL); |
| 369 if (c == '\r') | |
| 0 | 370 { |
| 371 readbuf[readpos] = '\0'; | |
| 372 read_handler(); | |
| 373 readpos = 0; | |
| 374 } | |
| 375 else | |
| 376 { | |
| 377 readbuf[readpos] = c; | |
| 378 readpos++; | |
| 379 if (readpos >= sizeof(readbuf)) | |
| 380 { | |
| 381 readpos = 0; | |
| 382 } | |
| 383 } | |
| 384 } | |
| 385 | |
| 2 | 386 ISR(TIMER2_COMPA_vect) |
| 1 | 387 { |
| 14 | 388 TCNT2 = 0; |
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389 measure_count ++; |
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390 comms_count ++; |
| 12 | 391 printf("measure_count %d\n", measure_count); |
| 14 | 392 if (measure_count >= MEASURE_WAKE) |
| 1 | 393 { |
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394 measure_count = 0; |
| 12 | 395 printf("need_measurement = 1\n"); |
| 1 | 396 need_measurement = 1; |
| 397 } | |
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398 |
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399 if (comms_count == COMMS_WAKE) |
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400 { |
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401 comms_count = 0; |
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402 need_comms = 1; |
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403 } |
| 1 | 404 } |
| 405 | |
| 3 | 406 DWORD get_fattime (void) |
| 407 { | |
| 408 return 0; | |
| 409 } | |
| 410 | |
| 1 | 411 static void |
| 412 deep_sleep() | |
| 413 { | |
| 414 // p119 of manual | |
| 2 | 415 OCR2A = SLEEP_COMPARE; |
| 416 loop_until_bit_is_clear(ASSR, OCR2AUB); | |
| 1 | 417 |
| 418 set_sleep_mode(SLEEP_MODE_PWR_SAVE); | |
| 419 sleep_mode(); | |
| 420 } | |
| 421 | |
| 422 static void | |
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423 idle_sleep() |
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424 { |
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425 set_sleep_mode(SLEEP_MODE_IDLE); |
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426 sleep_mode(); |
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427 } |
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428 |
| 14 | 429 #if 0 |
| 430 // untested | |
| 6 | 431 static void |
| 432 do_adc_335() | |
| 433 { | |
| 8 | 434 //PRR &= ~_BV(PRADC); |
| 6 | 435 |
| 436 ADMUX = _BV(ADLAR); | |
| 437 | |
| 438 // ADPS2 = /16 prescaler, 62khz at 1mhz clock | |
| 439 ADCSRA = _BV(ADEN) | _BV(ADPS2); | |
| 440 | |
| 441 // measure value | |
| 442 ADCSRA |= _BV(ADSC); | |
| 443 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 444 uint8_t low = ADCL; | |
| 445 uint8_t high = ADCH; | |
| 446 uint16_t f_measure = low + (high << 8); | |
| 447 | |
| 448 // set to measure 1.1 reference | |
| 449 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); | |
| 450 ADCSRA |= _BV(ADSC); | |
| 451 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 452 uint8_t low_11 = ADCL; | |
| 453 uint8_t high_11 = ADCH; | |
| 454 uint16_t f_11 = low_11 + (high_11 << 8); | |
| 455 | |
| 456 float res_volts = 1.1 * f_measure / f_11; | |
| 457 | |
| 458 // 10mV/degree | |
| 459 // scale to 1/5 degree units above 0C | |
| 460 int temp = (res_volts - 2.73) * 500; | |
| 13 | 461 // XXX fixme |
| 462 //measurements[n_measurements] = temp; | |
| 6 | 463 // XXX something if it hits the limit |
| 464 | |
| 465 // measure AVR internal temperature against 1.1 ref. | |
| 466 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(REFS1) | _BV(REFS0); | |
| 467 ADCSRA |= _BV(ADSC); | |
| 468 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 469 uint16_t res_internal = ADCL; | |
| 470 res_internal |= ADCH << 8; | |
| 471 | |
| 472 float internal_volts = res_internal * (1.1 / 1024.0); | |
| 473 | |
| 474 // 1mV/degree | |
| 475 int internal_temp = (internal_volts - 2.73) * 5000; | |
| 13 | 476 // XXX fixme |
| 477 //internal_measurements[n_measurements] = internal_temp; | |
| 6 | 478 |
| 479 printf_P("measure %d: external %d, internal %d, 1.1 %d\n", | |
| 480 n_measurements, temp, internal_temp, f_11); | |
| 481 | |
| 482 n_measurements++; | |
| 8 | 483 //PRR |= _BV(PRADC); |
| 6 | 484 } |
| 14 | 485 #endif |
| 6 | 486 |
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487 static void |
| 1 | 488 do_measurement() |
| 489 { | |
| 13 | 490 uint8_t n_sensors; |
| 14 | 491 printf("do_measurement\n"); |
| 13 | 492 eeprom_read(n_sensors, n_sensors); |
| 14 | 493 printf("do_measurement sensors %d\n", n_sensors); |
| 13 | 494 |
| 495 uint8_t ret = simple_ds18b20_start_meas(NULL); | |
| 14 | 496 printf_P(PSTR("Read all sensors, ret %d, waiting...\n"), ret); |
| 13 | 497 _delay_ms(DS18B20_TCONV_12BIT); |
| 498 | |
| 499 if (n_measurements == NUM_MEASUREMENTS) | |
| 500 { | |
| 14 | 501 printf_P(PSTR("Measurements .overflow\n")); |
| 13 | 502 n_measurements = 0; |
| 503 } | |
| 6 | 504 |
| 14 | 505 for (uint8_t s = 0; s < MAX_SENSORS; s++) |
| 13 | 506 { |
| 507 int16_t decicelsius; | |
| 14 | 508 if (s >= n_sensors) |
| 13 | 509 { |
| 510 decicelsius = VALUE_NOSENSOR; | |
| 511 } | |
| 512 else | |
| 513 { | |
| 514 uint8_t id[8]; | |
| 14 | 515 eeprom_read_to(id, sensor_id[s], 8); |
| 13 | 516 |
| 517 uint8_t ret = simple_ds18b20_read_decicelsius(id, &decicelsius); | |
| 518 if (ret != DS18X20_OK) | |
| 519 { | |
| 520 decicelsius = VALUE_BROKEN; | |
| 521 } | |
| 522 } | |
| 14 | 523 measurements[n_measurements][s] = decicelsius; |
| 13 | 524 } |
| 14 | 525 n_measurements++; |
| 12 | 526 //do_adc_335(); |
| 1 | 527 } |
| 528 | |
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529 static void |
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530 do_comms() |
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531 { |
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532 need_comms = 0; |
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533 |
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534 // turn on bluetooth |
| 7 | 535 uart_on(); |
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536 |
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537 // write sd card here? same 3.3v regulator... |
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538 |
| 12 | 539 printf("ready> \n"); |
| 540 | |
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541 comms_done = 0; |
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542 for (;;) |
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543 { |
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544 if (comms_done) |
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545 { |
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546 break; |
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547 } |
| 6 | 548 |
| 549 if (need_measurement) | |
| 550 { | |
| 14 | 551 need_measurement = 0; |
| 552 printf("measure from do_comms\n"); | |
| 6 | 553 do_measurement(); |
| 554 } | |
| 555 | |
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556 idle_sleep(); |
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557 } |
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558 |
| 6 | 559 uart_off(); |
| 560 | |
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561 // turn off bluetooth |
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562 } |
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563 |
| 7 | 564 static void |
| 565 blink() | |
| 566 { | |
| 567 PORT_LED &= ~_BV(PIN_LED); | |
| 9 | 568 _delay_ms(1); |
| 7 | 569 PORT_LED |= _BV(PIN_LED); |
| 570 } | |
| 571 | |
| 572 static void | |
| 573 long_delay(int ms) | |
| 574 { | |
| 575 int iter = ms / 100; | |
| 576 | |
| 577 for (int i = 0; i < iter; i++) | |
| 578 { | |
| 579 _delay_ms(100); | |
| 580 } | |
| 581 } | |
| 582 | |
| 8 | 583 ISR(BADISR_vect) |
| 584 { | |
| 14 | 585 //uart_on(); |
| 8 | 586 printf_P(PSTR("Bad interrupt\n")); |
| 587 } | |
| 588 | |
| 9 | 589 static void |
| 590 set_2mhz() | |
| 591 { | |
| 592 cli(); | |
| 593 CLKPR = _BV(CLKPCE); | |
| 594 // divide by 4 | |
| 595 CLKPR = _BV(CLKPS1); | |
| 596 sei(); | |
| 597 } | |
| 598 | |
| 0 | 599 int main(void) |
| 600 { | |
| 9 | 601 set_2mhz(); |
| 602 | |
| 7 | 603 DDR_LED |= _BV(PIN_LED); |
| 8 | 604 blink(); |
| 7 | 605 |
| 6 | 606 stdout = &mystdout; |
| 7 | 607 uart_on(); |
| 608 | |
| 6 | 609 fprintf_P(&mystdout, PSTR("hello %d\n"), 12); |
| 13 | 610 |
| 611 check_first_startup(); | |
| 612 | |
| 8 | 613 uart_off(); |
| 0 | 614 |
| 6 | 615 // turn off everything except timer2 |
| 8 | 616 //PRR = _BV(PRTWI) | _BV(PRTIM0) | _BV(PRTIM1) | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC); |
| 617 | |
| 618 // for testing | |
| 619 uart_on(); | |
| 620 | |
| 12 | 621 sei(); |
| 8 | 622 |
| 1 | 623 // set up counter2. |
| 624 // COM21 COM20 Set OC2 on Compare Match (p116) | |
| 625 // WGM21 Clear counter on compare | |
| 14 | 626 //TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); |
| 627 // toggle on match | |
| 628 TCCR2A = _BV(COM2A0); | |
| 1 | 629 // CS22 CS21 CS20 clk/1024 |
| 2 | 630 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20); |
| 1 | 631 // set async mode |
| 632 ASSR |= _BV(AS2); | |
| 14 | 633 TCNT2 = 0; |
| 634 OCR2A = SLEEP_COMPARE; | |
| 8 | 635 // interrupt |
| 636 TIMSK2 = _BV(OCIE2A); | |
| 0 | 637 |
| 14 | 638 #if 0 |
| 6 | 639 for (;;) |
| 640 { | |
| 12 | 641 do_comms(); |
| 6 | 642 } |
| 14 | 643 #endif |
| 12 | 644 |
| 0 | 645 for(;;){ |
| 646 /* insert your main loop code here */ | |
| 1 | 647 if (need_measurement) |
| 648 { | |
| 14 | 649 need_measurement = 0; |
| 1 | 650 do_measurement(); |
| 14 | 651 // testing |
| 652 cmd_fetch(); | |
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653 continue; |
| 1 | 654 } |
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655 |
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656 if (need_comms) |
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657 { |
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658 do_comms(); |
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659 continue; |
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660 } |
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661 |
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662 deep_sleep(); |
| 9 | 663 blink(); |
| 10 | 664 printf("."); |
| 0 | 665 } |
| 12 | 666 |
| 0 | 667 return 0; /* never reached */ |
| 668 } |