diff options
Diffstat (limited to 'fsm/adc.c')
| -rw-r--r-- | fsm/adc.c | 31 |
1 files changed, 29 insertions, 2 deletions
@@ -30,6 +30,7 @@ void adc_voltage_mode() { } +#if 0 #ifdef USE_VOLTAGE_DIVIDER static inline uint8_t calc_voltage_divider(uint16_t value) { // use 9.7 fixed-point to get sufficient precision @@ -44,6 +45,7 @@ static inline uint8_t calc_voltage_divider(uint16_t value) { return result; } #endif +#endif // Each full cycle runs ~2X per second with just voltage enabled, // or ~1X per second with voltage and temperature. @@ -67,7 +69,6 @@ ISR(ADC_vect) { // update the latest value #ifdef MCU_ADC_RESULT_PER_TYPE - // thermal, convert ADC reading to left-aligned Kelvin if (channel) m = mcu_adc_result_temp(); else m = mcu_adc_result_volts(); #else @@ -208,6 +209,19 @@ static inline void ADC_voltage_handler() { #endif else measurement = adc_smooth[0]; + // convert raw ADC value to FSM voltage units: (V * 100) << 6 + // 0 .. 65535 = 0.0V .. 10.24V + measurement = voltage_raw2cooked(measurement) / (10 << 5); + + // calculate actual voltage: volts * 10 + // TODO: should be (volts * 40) for extra precision + voltage = (measurement + VOLTAGE_FUDGE_FACTOR + #ifdef USE_VOLTAGE_CORRECTION + + VOLT_CORR - 7 + #endif + ) >> 1; + + #if 0 // values stair-step between intervals of 64, with random variations // of 1 or 2 in either direction, so if we chop off the last 6 bits // it'll flap between N and N-1... but if we add half an interval, @@ -231,6 +245,7 @@ static inline void ADC_voltage_handler() { #endif ) >> 1; #endif + #endif // if low, callback EV_voltage_low / EV_voltage_critical // (but only if it has been more than N seconds since last call) @@ -290,8 +305,14 @@ static inline void ADC_temperature_handler() { } // latest 16-bit ADC reading - uint16_t measurement = adc_smooth[1]; + // convert raw ADC value to Kelvin << 6 + // 0 .. 65535 = 0 K .. 1024 K + uint16_t measurement = temp_raw2cooked(adc_smooth[1]); + // (Kelvin << 6) to Celsius + temperature = (measurement>>6) + THERM_CAL_OFFSET + (int16_t)TH_CAL - 275; + + #if 0 // values stair-step between intervals of 64, with random variations // of 1 or 2 in either direction, so if we chop off the last 6 bits // it'll flap between N and N-1... but if we add half an interval, @@ -313,6 +334,12 @@ static inline void ADC_temperature_handler() { // external sensor temperature = EXTERN_TEMP_FORMULA(measurement>>1) + THERM_CAL_OFFSET + (int16_t)TH_CAL; #endif + #endif + + // instead of (K << 6), use (K << 1) now + // TODO: use more precision, if it can be done without overflow in 16 bits + // (and still work on attiny85 without increasing ROM size) + measurement = measurement >> 5; // how much has the temperature changed between now and a few seconds ago? int16_t diff; |