Mercurial > templog
annotate main.c @ 368:d4c9c360448f
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| author | Matt Johnston <matt@ucc.asn.au> |
|---|---|
| date | Tue, 26 Jun 2012 21:21:09 +0800 |
| parents | daad73f65c0f 3db118498b97 |
| children | ca08442635ca |
| rev | line source |
|---|---|
| 306 | 1 #include <stdio.h> |
| 2 #include <string.h> | |
| 319 | 3 #include <stddef.h> |
| 307 | 4 #include <avr/io.h> |
| 5 #include <avr/interrupt.h> | |
| 6 #include <avr/sleep.h> | |
| 313 | 7 #include <util/delay.h> |
| 312 | 8 #include <avr/pgmspace.h> |
| 319 | 9 #include <avr/eeprom.h> |
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10 #include <avr/wdt.h> |
| 365 | 11 #include <util/atomic.h> |
| 306 | 12 #include <util/crc16.h> |
| 13 | |
| 318 | 14 // for DWORD of get_fattime() |
| 309 | 15 #include "integer.h" |
| 318 | 16 |
| 17 #include "simple_ds18b20.h" | |
| 319 | 18 #include "onewire.h" |
| 309 | 19 |
| 306 | 20 // configuration params |
| 21 // - measurement interval | |
| 22 // - transmit interval | |
| 23 // - bluetooth params | |
| 24 // - number of sensors (and range?) | |
| 25 | |
| 307 | 26 // 1 second. we have 1024 prescaler, 32768 crystal. |
| 308 | 27 #define SLEEP_COMPARE 32 |
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28 // limited to uint16_t |
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29 #define MEASURE_WAKE 60 |
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30 |
| 319 | 31 #define VALUE_NOSENSOR -9000 |
| 32 #define VALUE_BROKEN -8000 | |
| 33 | |
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34 // limited to uint16_t |
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35 #define COMMS_WAKE 3600 // XXX testing |
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36 // limited to uint8_t |
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37 #define WAKE_SECS 60 // XXX testing |
| 308 | 38 |
| 316 | 39 #define BAUD 19200 |
| 313 | 40 #define UBRR ((F_CPU)/8/(BAUD)-1) |
| 41 | |
| 42 #define PORT_LED PORTC | |
| 43 #define DDR_LED DDRC | |
| 44 #define PIN_LED PC4 | |
| 307 | 45 |
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46 #define PORT_SHDN PORTD |
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47 #define DDR_SHDN DDRD |
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48 #define PIN_SHDN PD7 |
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49 |
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50 // limited to uint16_t |
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51 // XXX - increasing this to 300 causes strange failures, |
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52 // not sure why |
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53 #define NUM_MEASUREMENTS 280 |
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54 // limited to uint8_t |
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55 #define MAX_SENSORS 3 |
| 312 | 56 |
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57 // fixed at 8, have a shorter name |
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58 #define ID_LEN OW_ROMCODE_SIZE |
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59 |
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60 // #define HAVE_UART_ECHO |
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61 |
| 316 | 62 int uart_putchar(char c, FILE *stream); |
| 320 | 63 static void long_delay(int ms); |
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64 static void blink(); |
| 365 | 65 static uint16_t adc_vcc(); |
| 320 | 66 |
| 306 | 67 static FILE mystdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
| 68 _FDEV_SETUP_WRITE); | |
| 69 | |
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70 uint16_t crc_out; |
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71 static FILE _crc_stdout = FDEV_SETUP_STREAM(uart_putchar, NULL, |
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72 _FDEV_SETUP_WRITE); |
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73 // convenience |
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74 static FILE *crc_stdout = &_crc_stdout; |
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75 |
| 365 | 76 // ---- Atomic guards required accessing these variables |
| 77 static uint32_t clock_epoch; | |
| 78 static uint16_t comms_count; | |
| 79 static uint16_t measure_count; | |
| 80 // ---- End atomic guards required | |
| 81 | |
| 323 | 82 static uint16_t n_measurements; |
| 365 | 83 |
| 319 | 84 // stored as decidegrees |
| 320 | 85 static int16_t measurements[NUM_MEASUREMENTS][MAX_SENSORS]; |
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86 static uint32_t first_measurement_clock; |
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87 // last_measurement_clock is redundant but checks that we're not missing |
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88 // samples |
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89 static uint32_t last_measurement_clock; |
| 306 | 90 |
| 365 | 91 static uint32_t last_comms_clock; |
| 92 | |
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93 // boolean flags |
| 323 | 94 static uint8_t need_measurement; |
| 95 static uint8_t need_comms; | |
| 346 | 96 static uint8_t uart_enabled; |
| 307 | 97 |
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98 // counts down from WAKE_SECS to 0, goes to deep sleep when hits 0 |
| 323 | 99 static uint8_t comms_timeout; |
| 307 | 100 |
| 323 | 101 static uint8_t readpos; |
| 306 | 102 static char readbuf[30]; |
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103 static uint8_t have_cmd; |
| 306 | 104 |
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105 |
| 319 | 106 // thanks to http://projectgus.com/2010/07/eeprom-access-with-arduino/ |
| 107 #define eeprom_read_to(dst_p, eeprom_field, dst_size) eeprom_read_block((dst_p), (void *)offsetof(struct __eeprom_data, eeprom_field), (dst_size)) | |
| 108 #define eeprom_read(dst, eeprom_field) eeprom_read_to((&dst), eeprom_field, sizeof(dst)) | |
| 109 #define eeprom_write_from(src_p, eeprom_field, src_size) eeprom_write_block((src_p), (void *)offsetof(struct __eeprom_data, eeprom_field), (src_size)) | |
| 110 #define eeprom_write(src, eeprom_field) { eeprom_write_from(&src, eeprom_field, sizeof(src)); } | |
| 111 | |
| 112 #define EXPECT_MAGIC 0x67c9 | |
| 113 | |
| 114 struct __attribute__ ((__packed__)) __eeprom_data { | |
| 115 uint16_t magic; | |
| 116 uint8_t n_sensors; | |
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117 uint8_t sensor_id[MAX_SENSORS][ID_LEN]; |
| 319 | 118 }; |
| 119 | |
| 314 | 120 #define DEBUG(str) printf_P(PSTR(str)) |
| 121 | |
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122 static void deep_sleep(); |
| 307 | 123 |
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124 // Very first setup |
| 324 | 125 static void |
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126 setup_chip() |
| 324 | 127 { |
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128 cli(); |
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129 |
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130 // stop watchdog timer (might have been used to cause a reset) |
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131 wdt_reset(); |
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132 MCUSR &= ~_BV(WDRF); |
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133 WDTCSR |= _BV(WDCE) | _BV(WDE); |
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134 WDTCSR = 0; |
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135 |
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136 // Set clock to 2mhz |
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137 CLKPR = _BV(CLKPCE); |
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138 // divide by 4 |
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139 CLKPR = _BV(CLKPS1); |
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140 |
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141 // enable pullups |
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142 PORTB = 0xff; // XXX change when using SPI |
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143 PORTD = 0xff; |
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144 PORTC = 0xff; |
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145 |
| 325 | 146 // 3.3v power for bluetooth and SD |
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147 DDR_LED |= _BV(PIN_LED); |
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148 DDR_SHDN |= _BV(PIN_SHDN); |
| 325 | 149 |
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150 // set pullup |
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151 PORTD |= _BV(PD2); |
| 347 | 152 // INT0 setup |
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153 EICRA = (1<<ISC01); // falling edge - data sheet says it won't work? |
| 347 | 154 EIMSK = _BV(INT0); |
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155 |
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156 // comparator disable |
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157 ACSR = _BV(ACD); |
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158 |
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159 // disable adc pin input buffers |
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160 DIDR0 = 0x3F; // acd0-adc5 |
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161 DIDR1 = (1<<AIN1D)|(1<<AIN0D); // ain0/ain1 |
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162 |
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163 sei(); |
| 324 | 164 } |
| 165 | |
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166 static void |
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167 set_aux_power(uint8_t on) |
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168 { |
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169 if (on) |
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170 { |
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171 PORT_SHDN &= ~_BV(PIN_SHDN); |
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172 } |
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173 else |
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174 { |
| 349 | 175 PORT_SHDN |= _BV(PIN_SHDN); |
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176 } |
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177 } |
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178 |
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179 static void |
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180 setup_tick_counter() |
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181 { |
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182 // set up counter2. |
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183 // COM21 COM20 Set OC2 on Compare Match (p116) |
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184 // WGM21 Clear counter on compare |
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185 //TCCR2A = _BV(COM2A1) | _BV(COM2A0) | _BV(WGM21); |
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186 // toggle on match |
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187 TCCR2A = _BV(COM2A0); |
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188 // CS22 CS21 CS20 clk/1024 |
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189 TCCR2B = _BV(CS22) | _BV(CS21) | _BV(CS20); |
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190 // set async mode |
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191 ASSR |= _BV(AS2); |
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192 TCNT2 = 0; |
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193 OCR2A = SLEEP_COMPARE; |
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194 // interrupt |
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195 TIMSK2 = _BV(OCIE2A); |
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196 } |
| 324 | 197 |
| 306 | 198 static void |
| 313 | 199 uart_on() |
| 306 | 200 { |
| 314 | 201 // Power reduction register |
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202 PRR &= ~_BV(PRUSART0); |
| 314 | 203 |
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204 // All of this needs to be done each time after turning off the PRR |
| 306 | 205 // baud rate |
| 313 | 206 UBRR0H = (unsigned char)(UBRR >> 8); |
| 207 UBRR0L = (unsigned char)UBRR; | |
| 208 // set 2x clock, improves accuracy of UBRR | |
| 209 UCSR0A |= _BV(U2X0); | |
| 312 | 210 UCSR0B = _BV(RXCIE0) | _BV(RXEN0) | _BV(TXEN0); |
| 306 | 211 //8N1 |
| 313 | 212 UCSR0C = _BV(UCSZ01) | _BV(UCSZ00); |
| 347 | 213 uart_enabled = 1; |
| 312 | 214 } |
| 215 | |
| 216 static void | |
| 217 uart_off() | |
| 218 { | |
| 219 // Turn of interrupts and disable tx/rx | |
| 220 UCSR0B = 0; | |
| 347 | 221 uart_enabled = 0; |
| 312 | 222 |
| 223 // Power reduction register | |
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224 PRR |= _BV(PRUSART0); |
| 306 | 225 } |
| 226 | |
| 316 | 227 int |
| 306 | 228 uart_putchar(char c, FILE *stream) |
| 229 { | |
| 347 | 230 if (!uart_enabled) |
| 231 { | |
| 232 return EOF; | |
| 233 } | |
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234 // XXX could perhaps sleep in the loop for power. |
| 314 | 235 if (c == '\n') |
| 236 { | |
| 316 | 237 loop_until_bit_is_set(UCSR0A, UDRE0); |
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238 UDR0 = '\r'; |
| 314 | 239 } |
| 308 | 240 loop_until_bit_is_set(UCSR0A, UDRE0); |
| 241 UDR0 = c; | |
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242 if (stream == crc_stdout) |
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243 { |
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244 crc_out = _crc_ccitt_update(crc_out, c); |
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245 } |
| 316 | 246 if (c == '\r') |
| 247 { | |
| 248 loop_until_bit_is_set(UCSR0A, UDRE0); | |
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249 UDR0 = '\n'; |
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250 if (stream == crc_stdout) |
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251 { |
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252 crc_out = _crc_ccitt_update(crc_out, '\n'); |
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253 } |
| 316 | 254 } |
| 346 | 255 return (unsigned char)c; |
| 306 | 256 } |
| 257 | |
| 258 static void | |
| 259 cmd_fetch() | |
| 260 { | |
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261 crc_out = 0; |
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262 uint8_t n_sensors; |
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263 eeprom_read(n_sensors, n_sensors); |
| 319 | 264 |
| 365 | 265 uint16_t millivolt_vcc = adc_vcc(); |
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266 |
| 365 | 267 uint32_t epoch_copy; |
| 268 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) | |
| 269 { | |
| 270 epoch_copy = clock_epoch; | |
| 271 } | |
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272 |
| 366 | 273 fprintf_P(crc_stdout, PSTR("START\n" |
| 274 "now=%lu\n" | |
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275 "time_step=%hu\n" |
|
333
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276 "first_time=%lu\n" |
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277 "last_time=%lu\n" |
| 365 | 278 "comms_time=%lu\n" |
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279 "voltage=%hu\n" |
| 366 | 280 ), |
| 365 | 281 epoch_copy, |
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282 (uint16_t)MEASURE_WAKE, |
|
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283 first_measurement_clock, |
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284 last_measurement_clock, |
| 365 | 285 last_comms_clock, |
| 286 millivolt_vcc | |
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287 ); |
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288 fprintf_P(crc_stdout, PSTR("sensors=%u\n"), n_sensors); |
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289 for (uint8_t s = 0; s < n_sensors; s++) |
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290 { |
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291 uint8_t id[ID_LEN]; |
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292 fprintf_P(crc_stdout, PSTR("sensor_id%u="), s); |
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293 eeprom_read_to(id, sensor_id[s], ID_LEN); |
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294 printhex(id, ID_LEN, crc_stdout); |
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295 fputc('\n', crc_stdout); |
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296 } |
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297 fprintf_P(crc_stdout, PSTR("measurements=%hu\n"), n_measurements); |
| 320 | 298 for (uint16_t n = 0; n < n_measurements; n++) |
| 306 | 299 { |
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300 fprintf_P(crc_stdout, PSTR("meas%hu="), n); |
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301 for (uint8_t s = 0; s < n_sensors; s++) |
| 319 | 302 { |
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341
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303 fprintf_P(crc_stdout, PSTR(" %hu"), measurements[n][s]); |
| 319 | 304 } |
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305 fputc('\n', crc_stdout); |
| 306 | 306 } |
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307 fprintf_P(crc_stdout, PSTR("END\n")); |
|
331
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308 fprintf_P(stdout, PSTR("CRC=%hu\n"), crc_out); |
| 306 | 309 } |
| 310 | |
| 311 static void | |
| 312 cmd_clear() | |
| 313 { | |
| 313 | 314 n_measurements = 0; |
| 338 | 315 printf_P(PSTR("cleared\n")); |
| 306 | 316 } |
| 317 | |
| 318 static void | |
| 319 cmd_btoff() | |
| 320 { | |
| 365 | 321 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
| 322 { | |
| 323 comms_count = 0; | |
| 324 } | |
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325 printf_P(PSTR("off:%hu\n"), COMMS_WAKE); |
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326 _delay_ms(100); |
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327 comms_timeout = 0; |
| 306 | 328 } |
| 329 | |
| 330 static void | |
|
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331 cmd_awake() |
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332 { |
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333 comms_timeout = WAKE_SECS; |
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334 printf_P(PSTR("awake %hu\n"), WAKE_SECS); |
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335 } |
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336 |
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337 static void |
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338 cmd_reset() |
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339 { |
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340 printf_P(PSTR("reset\n")); |
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341 _delay_ms(100); |
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342 cli(); // disable interrupts |
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343 wdt_enable(WDTO_15MS); // enable watchdog |
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344 while(1); // wait for watchdog to reset processor |
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345 } |
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346 |
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347 static void |
| 318 | 348 cmd_measure() |
| 349 { | |
|
339
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350 printf_P(PSTR("measuring\n")); |
| 318 | 351 need_measurement = 1; |
| 352 } | |
| 353 | |
| 354 static void | |
| 355 cmd_sensors() | |
| 356 { | |
| 357 uint8_t ret = simple_ds18b20_start_meas(NULL); | |
| 320 | 358 printf_P(PSTR("All sensors, ret %d, waiting...\n"), ret); |
| 359 long_delay(DS18B20_TCONV_12BIT); | |
| 318 | 360 simple_ds18b20_read_all(); |
| 361 } | |
| 362 | |
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363 #if 0 |
| 319 | 364 // 0 on success |
| 365 static uint8_t | |
| 366 get_hex_string(const char *hex, uint8_t *out, uint8_t size) | |
| 367 { | |
| 368 uint8_t upper; | |
| 369 uint8_t o; | |
| 370 for (uint8_t i = 0, z = 0; o < size; i++) | |
| 371 { | |
| 372 uint8_t h = hex[i]; | |
| 373 if (h >= 'A' && h <= 'F') | |
| 374 { | |
| 375 // lower case | |
| 376 h += 0x20; | |
| 377 } | |
| 378 uint8_t nibble; | |
| 379 if (h >= '0' && h <= '9') | |
| 380 { | |
| 381 nibble = h - '0'; | |
| 382 } | |
| 383 else if (h >= 'a' && h <= 'f') | |
| 384 { | |
| 385 nibble = 10 + h - 'a'; | |
| 386 } | |
| 387 else if (h == ' ' || h == ':') | |
| 388 { | |
| 389 continue; | |
| 390 } | |
| 391 else | |
| 392 { | |
| 393 printf_P(PSTR("Bad hex 0x%x '%c'\n"), hex[i], hex[i]); | |
| 394 return 1; | |
| 395 } | |
| 396 | |
| 397 if (z % 2 == 0) | |
| 398 { | |
| 399 upper = nibble << 4; | |
| 400 } | |
| 401 else | |
| 402 { | |
| 403 out[o] = upper | nibble; | |
| 404 o++; | |
| 405 } | |
| 406 | |
| 407 z++; | |
| 408 } | |
| 409 | |
| 410 if (o != size) | |
| 411 { | |
| 412 printf_P(PSTR("Short hex\n")); | |
| 413 return 1; | |
| 414 } | |
| 415 return 0; | |
| 416 } | |
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417 #endif |
| 319 | 418 |
| 419 static void | |
| 420 add_sensor(uint8_t *id) | |
| 421 { | |
| 422 uint8_t n; | |
| 423 eeprom_read(n, n_sensors); | |
| 424 if (n < MAX_SENSORS) | |
| 425 { | |
| 426 cli(); | |
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427 eeprom_write_from(id, sensor_id[n], ID_LEN); |
| 319 | 428 n++; |
| 429 eeprom_write(n, n_sensors); | |
| 430 sei(); | |
| 431 printf_P(PSTR("Added sensor %d : "), n); | |
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432 printhex(id, ID_LEN, stdout); |
| 319 | 433 putchar('\n'); |
| 434 } | |
| 435 else | |
| 436 { | |
| 437 printf_P(PSTR("Too many sensors\n")); | |
| 438 } | |
| 439 } | |
| 440 | |
| 441 static void | |
| 442 cmd_add_all() | |
| 443 { | |
| 347 | 444 uint8_t id[OW_ROMCODE_SIZE]; |
| 319 | 445 printf_P("Adding all\n"); |
| 446 ow_reset(); | |
| 347 | 447 for( uint8_t diff = OW_SEARCH_FIRST; diff != OW_LAST_DEVICE; ) |
| 448 { | |
| 449 diff = ow_rom_search( diff, &id[0] ); | |
| 450 if( diff == OW_PRESENCE_ERR ) { | |
| 451 printf_P( PSTR("No Sensor found\r") ); | |
| 452 return; | |
| 453 } | |
| 454 | |
| 455 if( diff == OW_DATA_ERR ) { | |
| 456 printf_P( PSTR("Bus Error\r") ); | |
| 457 return; | |
| 458 } | |
| 319 | 459 add_sensor(id); |
| 460 } | |
| 461 } | |
| 462 | |
| 463 static void | |
| 464 cmd_init() | |
| 465 { | |
| 466 printf_P(PSTR("Resetting sensor list\n")); | |
| 467 uint8_t zero = 0; | |
| 468 cli(); | |
| 469 eeprom_write(zero, n_sensors); | |
| 470 sei(); | |
| 471 printf_P(PSTR("Done.\n")); | |
| 472 } | |
| 473 | |
| 474 static void | |
| 475 check_first_startup() | |
| 476 { | |
| 477 uint16_t magic; | |
| 478 eeprom_read(magic, magic); | |
| 479 if (magic != EXPECT_MAGIC) | |
| 480 { | |
| 481 printf_P(PSTR("First boot, looking for sensors...\n")); | |
|
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482 // in case of power fumbles don't want to reset during eeprom write, |
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483 long_delay(2); |
| 319 | 484 cmd_init(); |
| 485 cmd_add_all(); | |
| 320 | 486 cli(); |
| 487 magic = EXPECT_MAGIC; | |
| 488 eeprom_write(magic, magic); | |
| 489 sei(); | |
| 319 | 490 } |
| 491 } | |
| 492 | |
| 318 | 493 static void |
| 306 | 494 read_handler() |
| 495 { | |
| 312 | 496 if (strcmp_P(readbuf, PSTR("fetch")) == 0) |
| 306 | 497 { |
| 498 cmd_fetch(); | |
| 499 } | |
| 312 | 500 else if (strcmp_P(readbuf, PSTR("clear")) == 0) |
| 306 | 501 { |
| 502 cmd_clear(); | |
| 503 } | |
| 312 | 504 else if (strcmp_P(readbuf, PSTR("btoff")) == 0) |
| 306 | 505 { |
| 506 cmd_btoff(); | |
| 507 } | |
| 318 | 508 else if (strcmp_P(readbuf, PSTR("measure")) == 0) |
| 509 { | |
| 510 cmd_measure(); | |
| 511 } | |
| 512 else if (strcmp_P(readbuf, PSTR("sensors")) == 0) | |
| 513 { | |
| 514 cmd_sensors(); | |
| 515 } | |
| 319 | 516 else if (strcmp_P(readbuf, PSTR("addall"))== 0) |
| 517 { | |
| 518 cmd_add_all(); | |
| 519 } | |
|
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520 else if (strcmp_P(readbuf, PSTR("awake"))== 0) |
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521 { |
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522 cmd_awake(); |
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523 } |
| 319 | 524 else if (strcmp_P(readbuf, PSTR("init")) == 0) |
| 525 { | |
| 526 cmd_init(); | |
| 527 } | |
|
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528 else if (strcmp_P(readbuf, PSTR("reset")) == 0) |
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529 { |
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530 cmd_reset(); |
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531 } |
| 306 | 532 else |
| 533 { | |
| 312 | 534 printf_P(PSTR("Bad command\n")); |
| 306 | 535 } |
| 536 } | |
| 537 | |
|
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538 ISR(INT0_vect) |
| 324 | 539 { |
| 347 | 540 need_comms = 1; |
|
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541 comms_timeout = WAKE_SECS; |
|
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542 blink(); |
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543 _delay_ms(100); |
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544 blink(); |
| 324 | 545 } |
| 546 | |
| 547 | |
| 308 | 548 ISR(USART_RX_vect) |
| 306 | 549 { |
| 308 | 550 char c = UDR0; |
|
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551 #ifdef HAVE_UART_ECHO |
| 318 | 552 uart_putchar(c, NULL); |
|
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553 #endif |
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554 if (c == '\r' || c == '\n') |
| 306 | 555 { |
|
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556 if (readpos > 0) |
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557 { |
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558 readbuf[readpos] = '\0'; |
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559 have_cmd = 1; |
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560 readpos = 0; |
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561 } |
| 306 | 562 } |
| 563 else | |
| 564 { | |
| 565 readbuf[readpos] = c; | |
| 566 readpos++; | |
| 567 if (readpos >= sizeof(readbuf)) | |
| 568 { | |
| 569 readpos = 0; | |
| 570 } | |
| 571 } | |
| 572 } | |
| 573 | |
| 308 | 574 ISR(TIMER2_COMPA_vect) |
| 307 | 575 { |
| 320 | 576 TCNT2 = 0; |
|
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577 measure_count ++; |
| 347 | 578 comms_count ++; |
|
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579 |
| 323 | 580 clock_epoch ++; |
| 581 | |
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582 if (comms_timeout != 0) |
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583 { |
| 349 | 584 comms_timeout--; |
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585 } |
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586 |
| 320 | 587 if (measure_count >= MEASURE_WAKE) |
| 307 | 588 { |
|
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589 measure_count = 0; |
| 307 | 590 need_measurement = 1; |
| 591 } | |
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592 |
| 347 | 593 if (comms_count >= COMMS_WAKE) |
| 594 { | |
| 595 comms_count = 0; | |
| 596 need_comms = 1; | |
| 597 } | |
| 307 | 598 } |
| 599 | |
| 309 | 600 DWORD get_fattime (void) |
| 601 { | |
| 602 return 0; | |
| 603 } | |
| 604 | |
| 307 | 605 static void |
| 606 deep_sleep() | |
| 607 { | |
| 608 // p119 of manual | |
| 308 | 609 OCR2A = SLEEP_COMPARE; |
| 610 loop_until_bit_is_clear(ASSR, OCR2AUB); | |
| 307 | 611 |
| 612 set_sleep_mode(SLEEP_MODE_PWR_SAVE); | |
| 613 sleep_mode(); | |
| 614 } | |
| 615 | |
| 616 static void | |
|
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617 idle_sleep() |
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618 { |
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619 set_sleep_mode(SLEEP_MODE_IDLE); |
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620 sleep_mode(); |
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621 } |
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622 |
| 365 | 623 static uint16_t |
| 624 adc_vcc() | |
|
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625 { |
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626 PRR &= ~_BV(PRADC); |
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627 |
| 368 | 628 // /16 prescaler |
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629 ADCSRA = _BV(ADEN) | _BV(ADPS2); |
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630 |
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631 // set to measure 1.1 reference |
| 364 | 632 ADMUX = _BV(REFS0) | _BV(MUX3) | _BV(MUX2) | _BV(MUX1); |
| 366 | 633 // average a number of samples |
| 634 uint16_t sum = 0; | |
| 635 uint8_t num = 0; | |
| 636 for (uint8_t n = 0; n < 20; n++) | |
| 365 | 637 { |
| 638 ADCSRA |= _BV(ADSC); | |
| 639 loop_until_bit_is_clear(ADCSRA, ADSC); | |
|
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640 |
| 366 | 641 uint8_t low_11 = ADCL; |
| 642 uint8_t high_11 = ADCH; | |
| 643 uint16_t val = low_11 + (high_11 << 8); | |
| 312 | 644 |
| 366 | 645 if (n >= 4) |
| 646 { | |
| 647 sum += val; | |
| 648 num++; | |
| 649 } | |
| 650 } | |
| 651 ADCSRA = 0; | |
| 652 PRR |= _BV(PRADC); | |
| 312 | 653 |
| 366 | 654 float res_volts = 1.1 * 1024 * num / sum; |
| 312 | 655 |
| 365 | 656 return 1000 * res_volts; |
| 312 | 657 } |
| 658 | |
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659 static void |
| 307 | 660 do_measurement() |
| 661 { | |
| 319 | 662 uint8_t n_sensors; |
| 663 eeprom_read(n_sensors, n_sensors); | |
| 664 | |
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665 simple_ds18b20_start_meas(NULL); |
| 365 | 666 // sleep rather than using a long delay |
| 667 deep_sleep(); | |
| 668 //_delay_ms(DS18B20_TCONV_12BIT); | |
| 319 | 669 |
| 670 if (n_measurements == NUM_MEASUREMENTS) | |
| 671 { | |
| 672 n_measurements = 0; | |
| 673 } | |
| 312 | 674 |
| 320 | 675 for (uint8_t s = 0; s < MAX_SENSORS; s++) |
| 319 | 676 { |
| 677 int16_t decicelsius; | |
| 320 | 678 if (s >= n_sensors) |
| 319 | 679 { |
| 680 decicelsius = VALUE_NOSENSOR; | |
| 681 } | |
| 682 else | |
| 683 { | |
|
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684 uint8_t id[ID_LEN]; |
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|
685 eeprom_read_to(id, sensor_id[s], ID_LEN); |
| 319 | 686 |
| 687 uint8_t ret = simple_ds18b20_read_decicelsius(id, &decicelsius); | |
| 688 if (ret != DS18X20_OK) | |
| 689 { | |
| 690 decicelsius = VALUE_BROKEN; | |
| 691 } | |
| 692 } | |
| 320 | 693 measurements[n_measurements][s] = decicelsius; |
| 319 | 694 } |
|
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|
695 |
| 365 | 696 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
|
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|
697 { |
| 365 | 698 if (n_measurements == 0) |
| 699 { | |
| 700 first_measurement_clock = clock_epoch; | |
| 701 } | |
| 702 last_measurement_clock = clock_epoch; | |
|
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|
703 } |
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|
704 |
| 320 | 705 n_measurements++; |
| 318 | 706 //do_adc_335(); |
| 307 | 707 } |
| 708 | |
|
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|
709 static void |
|
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|
710 do_comms() |
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|
711 { |
| 347 | 712 // turn on bluetooth |
| 365 | 713 ATOMIC_BLOCK(ATOMIC_RESTORESTATE) |
| 714 { | |
| 715 last_comms_clock = clock_epoch; | |
| 716 } | |
|
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|
717 set_aux_power(1); |
| 313 | 718 uart_on(); |
| 347 | 719 |
| 720 // write sd card here? same 3.3v regulator... | |
| 721 | |
| 722 for (comms_timeout = WAKE_SECS; comms_timeout > 0; ) | |
| 723 { | |
| 312 | 724 if (need_measurement) |
| 725 { | |
| 320 | 726 need_measurement = 0; |
| 312 | 727 do_measurement(); |
| 349 | 728 continue; |
| 312 | 729 } |
| 730 | |
|
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|
731 if (have_cmd) |
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|
732 { |
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|
733 have_cmd = 0; |
|
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|
734 read_handler(); |
| 349 | 735 continue; |
|
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|
736 } |
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|
737 |
|
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|
738 // wait for commands from the master |
| 347 | 739 idle_sleep(); |
| 740 } | |
|
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|
741 |
| 312 | 742 uart_off(); |
|
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|
743 // in case bluetooth takes time to flush |
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|
744 _delay_ms(100); |
|
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745 set_aux_power(0); |
|
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|
746 } |
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|
747 |
| 313 | 748 static void |
| 749 blink() | |
| 750 { | |
| 751 PORT_LED &= ~_BV(PIN_LED); | |
| 315 | 752 _delay_ms(1); |
| 313 | 753 PORT_LED |= _BV(PIN_LED); |
| 754 } | |
| 755 | |
| 756 static void | |
| 757 long_delay(int ms) | |
| 758 { | |
| 759 int iter = ms / 100; | |
| 760 | |
| 761 for (int i = 0; i < iter; i++) | |
| 762 { | |
| 763 _delay_ms(100); | |
| 764 } | |
| 765 } | |
| 766 | |
| 314 | 767 ISR(BADISR_vect) |
| 768 { | |
| 320 | 769 //uart_on(); |
| 314 | 770 printf_P(PSTR("Bad interrupt\n")); |
| 771 } | |
| 772 | |
| 306 | 773 int main(void) |
| 774 { | |
|
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|
775 setup_chip(); |
|
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|
776 blink(); |
| 315 | 777 |
|
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|
778 set_aux_power(0); |
| 313 | 779 |
| 312 | 780 stdout = &mystdout; |
| 313 | 781 uart_on(); |
| 782 | |
|
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|
783 printf(PSTR("Started.\n")); |
| 319 | 784 |
| 785 check_first_startup(); | |
| 786 | |
| 314 | 787 uart_off(); |
| 306 | 788 |
| 312 | 789 // turn off everything except timer2 |
|
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diff
changeset
|
790 PRR = _BV(PRTWI) | _BV(PRTIM0) | _BV(PRTIM1) | _BV(PRSPI) | _BV(PRUSART0) | _BV(PRADC); |
| 314 | 791 |
| 792 // for testing | |
| 793 uart_on(); | |
| 794 | |
|
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|
795 setup_tick_counter(); |
|
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|
796 |
| 318 | 797 sei(); |
| 314 | 798 |
|
331
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changeset
|
799 need_comms = 1; |
|
341
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diff
changeset
|
800 need_measurement = 1; |
|
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|
801 |
|
322
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|
802 for(;;) |
|
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|
803 { |
| 307 | 804 if (need_measurement) |
| 805 { | |
| 320 | 806 need_measurement = 0; |
| 307 | 807 do_measurement(); |
| 347 | 808 continue; |
| 307 | 809 } |
|
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|
810 |
|
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|
811 if (need_comms) |
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|
812 { |
|
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|
813 need_comms = 0; |
|
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|
814 do_comms(); |
| 347 | 815 continue; |
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310
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816 } |
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817 |
| 347 | 818 deep_sleep(); |
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819 if (clock_epoch % 60 == 0) |
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820 { |
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821 blink(); |
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822 } |
| 306 | 823 } |
| 318 | 824 |
| 306 | 825 return 0; /* never reached */ |
| 826 } |