Mercurial > templog
annotate main.c @ 10:1bfe28c348dd
reading DS18B20 works
add some linker optimisations
| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Sat, 19 May 2012 17:10:13 +0800 |
| parents | 7da9a3f23592 |
| children | 3c27bfbd7f3a |
| 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 | |
| 3 | 16 #include "integer.h" |
| 9 | 17 #include "onewire.h" |
| 10 | 18 #include "ds18x20.h" |
| 3 | 19 |
| 0 | 20 // configuration params |
| 21 // - measurement interval | |
| 22 // - transmit interval | |
| 23 // - bluetooth params | |
| 24 // - number of sensors (and range?) | |
| 25 | |
| 1 | 26 // 1 second. we have 1024 prescaler, 32768 crystal. |
| 2 | 27 #define SLEEP_COMPARE 32 |
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28 #define MEASURE_WAKE 60 |
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29 |
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30 #define COMMS_WAKE 3600 |
| 2 | 31 |
| 10 | 32 #define BAUD 19200 |
| 7 | 33 #define UBRR ((F_CPU)/8/(BAUD)-1) |
| 34 | |
| 35 #define PORT_LED PORTC | |
| 36 #define DDR_LED DDRC | |
| 37 #define PIN_LED PC4 | |
| 1 | 38 |
| 6 | 39 #define NUM_MEASUREMENTS 300 |
| 40 | |
| 10 | 41 int uart_putchar(char c, FILE *stream); |
| 0 | 42 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
| 43 _FDEV_SETUP_WRITE); | |
| 44 | |
| 7 | 45 static uint8_t n_measurements = 0; |
| 6 | 46 // stored as 1/5 degree above 0 |
| 47 static uint8_t measurements[NUM_MEASUREMENTS]; | |
| 48 static uint8_t internal_measurements[NUM_MEASUREMENTS]; | |
| 0 | 49 |
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50 // boolean flags |
| 7 | 51 static uint8_t need_measurement = 0; |
| 52 static uint8_t need_comms = 0; | |
| 53 static uint8_t comms_done = 0; | |
| 1 | 54 |
| 7 | 55 static uint8_t readpos = 0; |
| 0 | 56 static char readbuf[30]; |
| 57 | |
| 7 | 58 static uint8_t measure_count = 0; |
| 59 static uint16_t comms_count = 0; | |
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60 |
| 8 | 61 #define DEBUG(str) printf_P(PSTR(str)) |
| 62 | |
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63 static void deep_sleep(); |
| 1 | 64 |
| 0 | 65 static void |
| 7 | 66 uart_on() |
| 0 | 67 { |
| 8 | 68 // Power reduction register |
| 69 //PRR &= ~_BV(PRUSART0); | |
| 70 | |
| 0 | 71 // baud rate |
| 7 | 72 UBRR0H = (unsigned char)(UBRR >> 8); |
| 73 UBRR0L = (unsigned char)UBRR; | |
| 74 // set 2x clock, improves accuracy of UBRR | |
| 75 UCSR0A |= _BV(U2X0); | |
| 6 | 76 UCSR0B = _BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0); |
| 0 | 77 //8N1 |
| 7 | 78 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); |
| 6 | 79 } |
| 80 | |
| 81 static void | |
| 82 uart_off() | |
| 83 { | |
| 84 // Turn of interrupts and disable tx/rx | |
| 85 UCSR0B = 0; | |
| 86 | |
| 87 // Power reduction register | |
| 8 | 88 //PRR |= _BV(PRUSART0); |
| 0 | 89 } |
| 90 | |
| 10 | 91 int |
| 0 | 92 uart_putchar(char c, FILE *stream) |
| 93 { | |
| 10 | 94 // XXX should sleep in the loop for power. |
| 8 | 95 if (c == '\n') |
| 96 { | |
| 10 | 97 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 98 UDR0 = '\r';; | |
| 8 | 99 } |
| 2 | 100 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 101 UDR0 = c; | |
| 10 | 102 if (c == '\r') |
| 103 { | |
| 104 loop_until_bit_is_set(UCSR0A, UDRE0); | |
| 105 UDR0 = '\n';; | |
| 106 } | |
| 0 | 107 return 0; |
| 108 } | |
| 109 | |
| 110 static void | |
| 111 cmd_fetch() | |
| 112 { | |
| 113 uint16_t crc = 0; | |
| 114 int i; | |
| 6 | 115 printf_P(PSTR("%d measurements\n"), n_measurements); |
| 0 | 116 for (i = 0; i < n_measurements; i++) |
| 117 { | |
| 6 | 118 printf_P(PSTR("%3d : %d\n"), i, measurements[i]); |
| 1 | 119 crc = _crc_ccitt_update(crc, measurements[i]); |
| 0 | 120 } |
| 6 | 121 printf_P(PSTR("CRC : %d\n"), crc); |
| 0 | 122 } |
| 123 | |
| 124 static void | |
| 125 cmd_clear() | |
| 126 { | |
| 7 | 127 n_measurements = 0; |
| 128 printf_P(PSTR("Cleared\n")); | |
| 0 | 129 } |
| 130 | |
| 131 static void | |
| 132 cmd_btoff() | |
| 133 { | |
| 7 | 134 printf_P(PSTR("Turning off\n")); |
| 135 _delay_ms(50); | |
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136 comms_done = 1; |
| 0 | 137 } |
| 138 | |
| 139 static void | |
| 140 read_handler() | |
| 141 { | |
| 6 | 142 if (strcmp_P(readbuf, PSTR("fetch")) == 0) |
| 0 | 143 { |
| 144 cmd_fetch(); | |
| 145 } | |
| 6 | 146 else if (strcmp_P(readbuf, PSTR("clear")) == 0) |
| 0 | 147 { |
| 148 cmd_clear(); | |
| 149 } | |
| 6 | 150 else if (strcmp_P(readbuf, PSTR("btoff")) == 0) |
| 0 | 151 { |
| 152 cmd_btoff(); | |
| 153 } | |
| 154 else | |
| 155 { | |
| 6 | 156 printf_P(PSTR("Bad command\n")); |
| 0 | 157 } |
| 158 } | |
| 159 | |
| 2 | 160 ISR(USART_RX_vect) |
| 0 | 161 { |
| 2 | 162 char c = UDR0; |
| 0 | 163 if (c == '\n') |
| 164 { | |
| 165 readbuf[readpos] = '\0'; | |
| 166 read_handler(); | |
| 167 readpos = 0; | |
| 168 } | |
| 169 else | |
| 170 { | |
| 171 readbuf[readpos] = c; | |
| 172 readpos++; | |
| 173 if (readpos >= sizeof(readbuf)) | |
| 174 { | |
| 175 readpos = 0; | |
| 176 } | |
| 177 } | |
| 178 } | |
| 179 | |
| 2 | 180 ISR(TIMER2_COMPA_vect) |
| 1 | 181 { |
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182 measure_count ++; |
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183 comms_count ++; |
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184 if (measure_count == MEASURE_WAKE) |
| 1 | 185 { |
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186 measure_count = 0; |
| 1 | 187 need_measurement = 1; |
| 188 } | |
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189 |
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190 if (comms_count == COMMS_WAKE) |
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191 { |
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192 comms_count = 0; |
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193 need_comms = 1; |
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194 } |
| 1 | 195 } |
| 196 | |
| 3 | 197 DWORD get_fattime (void) |
| 198 { | |
| 199 return 0; | |
| 200 } | |
| 201 | |
| 1 | 202 static void |
| 203 deep_sleep() | |
| 204 { | |
| 205 // p119 of manual | |
| 2 | 206 OCR2A = SLEEP_COMPARE; |
| 207 loop_until_bit_is_clear(ASSR, OCR2AUB); | |
| 1 | 208 |
| 209 set_sleep_mode(SLEEP_MODE_PWR_SAVE); | |
| 210 sleep_mode(); | |
| 211 } | |
| 212 | |
| 213 static void | |
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214 idle_sleep() |
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215 { |
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216 set_sleep_mode(SLEEP_MODE_IDLE); |
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217 sleep_mode(); |
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218 } |
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219 |
| 6 | 220 static void |
| 221 do_adc_335() | |
| 222 { | |
| 8 | 223 //PRR &= ~_BV(PRADC); |
| 6 | 224 |
| 225 ADMUX = _BV(ADLAR); | |
| 226 | |
| 227 // ADPS2 = /16 prescaler, 62khz at 1mhz clock | |
| 228 ADCSRA = _BV(ADEN) | _BV(ADPS2); | |
| 229 | |
| 230 // measure value | |
| 231 ADCSRA |= _BV(ADSC); | |
| 232 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 233 uint8_t low = ADCL; | |
| 234 uint8_t high = ADCH; | |
| 235 uint16_t f_measure = low + (high << 8); | |
| 236 | |
| 237 // set to measure 1.1 reference | |
| 238 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); | |
| 239 ADCSRA |= _BV(ADSC); | |
| 240 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 241 uint8_t low_11 = ADCL; | |
| 242 uint8_t high_11 = ADCH; | |
| 243 uint16_t f_11 = low_11 + (high_11 << 8); | |
| 244 | |
| 245 float res_volts = 1.1 * f_measure / f_11; | |
| 246 | |
| 247 // 10mV/degree | |
| 248 // scale to 1/5 degree units above 0C | |
| 249 int temp = (res_volts - 2.73) * 500; | |
| 250 measurements[n_measurements] = temp; | |
| 251 // XXX something if it hits the limit | |
| 252 | |
| 253 // measure AVR internal temperature against 1.1 ref. | |
| 254 ADMUX = _BV(ADLAR) | _BV(MUX3) | _BV(REFS1) | _BV(REFS0); | |
| 255 ADCSRA |= _BV(ADSC); | |
| 256 loop_until_bit_is_clear(ADCSRA, ADSC); | |
| 257 uint16_t res_internal = ADCL; | |
| 258 res_internal |= ADCH << 8; | |
| 259 | |
| 260 float internal_volts = res_internal * (1.1 / 1024.0); | |
| 261 | |
| 262 // 1mV/degree | |
| 263 int internal_temp = (internal_volts - 2.73) * 5000; | |
| 264 internal_measurements[n_measurements] = internal_temp; | |
| 265 | |
| 266 printf_P("measure %d: external %d, internal %d, 1.1 %d\n", | |
| 267 n_measurements, temp, internal_temp, f_11); | |
| 268 | |
| 269 n_measurements++; | |
| 8 | 270 //PRR |= _BV(PRADC); |
| 6 | 271 } |
| 272 | |
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273 static void |
| 1 | 274 do_measurement() |
| 275 { | |
| 276 need_measurement = 0; | |
| 6 | 277 |
| 278 do_adc_335(); | |
| 1 | 279 } |
| 280 | |
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281 static void |
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282 do_comms() |
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283 { |
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284 need_comms = 0; |
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285 |
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286 // turn on bluetooth |
| 7 | 287 uart_on(); |
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288 |
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289 // write sd card here? same 3.3v regulator... |
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290 |
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291 comms_done = 0; |
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292 for (;;) |
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293 { |
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294 if (comms_done) |
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295 { |
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296 break; |
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297 } |
| 6 | 298 |
| 299 if (need_measurement) | |
| 300 { | |
| 301 do_measurement(); | |
| 302 } | |
| 303 | |
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304 idle_sleep(); |
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305 } |
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306 |
| 6 | 307 uart_off(); |
| 308 | |
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309 // turn off bluetooth |
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310 } |
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311 |
| 7 | 312 static void |
| 313 blink() | |
| 314 { | |
| 315 PORT_LED &= ~_BV(PIN_LED); | |
| 9 | 316 _delay_ms(1); |
| 7 | 317 PORT_LED |= _BV(PIN_LED); |
| 318 } | |
| 319 | |
| 320 static void | |
| 321 long_delay(int ms) | |
| 322 { | |
| 323 int iter = ms / 100; | |
| 324 | |
| 325 for (int i = 0; i < iter; i++) | |
| 326 { | |
| 327 _delay_ms(100); | |
| 328 } | |
| 329 } | |
| 330 | |
| 8 | 331 ISR(BADISR_vect) |
| 332 { | |
| 333 uart_on(); | |
| 334 printf_P(PSTR("Bad interrupt\n")); | |
| 335 } | |
| 336 | |
| 9 | 337 static void |
| 338 set_2mhz() | |
| 339 { | |
| 340 cli(); | |
| 341 CLKPR = _BV(CLKPCE); | |
| 342 // divide by 4 | |
| 343 CLKPR = _BV(CLKPS1); | |
| 344 sei(); | |
| 345 } | |
| 346 | |
| 347 static void | |
| 348 test1wire() | |
| 349 { | |
| 10 | 350 //ow_reset(); |
| 351 | |
| 352 uint8_t ret = DS18X20_start_meas( DS18X20_POWER_PARASITE, NULL); | |
| 353 printf("ret %d\n", ret); | |
| 354 _delay_ms(DS18B20_TCONV_12BIT); | |
| 355 DS18X20_read_meas_all_verbose(); | |
| 9 | 356 } |
| 357 | |
| 0 | 358 int main(void) |
| 359 { | |
| 9 | 360 set_2mhz(); |
| 361 | |
| 7 | 362 DDR_LED |= _BV(PIN_LED); |
| 8 | 363 blink(); |
| 7 | 364 |
| 6 | 365 stdout = &mystdout; |
| 7 | 366 uart_on(); |
| 367 | |
| 6 | 368 fprintf_P(&mystdout, PSTR("hello %d\n"), 12); |
| 8 | 369 uart_off(); |
| 0 | 370 |
| 6 | 371 // turn off everything except timer2 |
| 8 | 372 //PRR = _BV(PRTWI) | _BV(PRTIM0) | _BV(PRTIM1) | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC); |
| 373 | |
| 374 // for testing | |
| 375 uart_on(); | |
| 376 | |
| 10 | 377 //sei(); |
| 8 | 378 |
| 10 | 379 for (;;) |
| 380 { | |
| 381 test1wire(); | |
| 382 long_delay(2000); | |
| 383 } | |
| 0 | 384 |
| 1 | 385 // set up counter2. |
| 386 // COM21 COM20 Set OC2 on Compare Match (p116) | |
| 387 // WGM21 Clear counter on compare | |
| 8 | 388 TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); |
| 1 | 389 // CS22 CS21 CS20 clk/1024 |
| 2 | 390 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20); |
| 1 | 391 // set async mode |
| 392 ASSR |= _BV(AS2); | |
| 8 | 393 // interrupt |
| 394 TIMSK2 = _BV(OCIE2A); | |
| 0 | 395 |
| 6 | 396 #ifdef TEST_MODE |
| 397 for (;;) | |
| 398 { | |
| 399 do_comms() | |
| 400 } | |
| 401 #else | |
| 0 | 402 for(;;){ |
| 9 | 403 |
| 404 test1wire(); | |
| 405 | |
| 0 | 406 /* insert your main loop code here */ |
| 1 | 407 if (need_measurement) |
| 408 { | |
| 409 do_measurement(); | |
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410 continue; |
| 1 | 411 } |
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412 |
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413 if (need_comms) |
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414 { |
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415 do_comms(); |
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416 continue; |
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417 } |
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418 |
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419 deep_sleep(); |
| 9 | 420 blink(); |
| 10 | 421 printf("."); |
| 0 | 422 } |
| 6 | 423 #endif |
| 0 | 424 return 0; /* never reached */ |
| 425 } |