diff options
| -rw-r--r-- | sw/main.cpp | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/sw/main.cpp b/sw/main.cpp index c9ecd04..894693a 100644 --- a/sw/main.cpp +++ b/sw/main.cpp @@ -475,7 +475,10 @@ int main() // ADSC is cleared when the conversion finishes if ((ADCSRA & ADSC) == 0) { // BAT+ - const uint16_t adc_value_0 = ((uint16_t)ADCH << 8) | ADCL; + + // Datasheet 24.9.3 says ADCL must be read first + const uint8_t adcl = ADCL; + const uint16_t adc_value_0 = ((uint16_t)ADCH << 8) | adcl; send_voltage(ADC_VALUE_TO_MILLIVOLT(adc_value_0) * 4, true, time_now); SET_ADMUX(1); // Start ADC conversion @@ -488,7 +491,8 @@ int main() // ADSC is cleared when the conversion finishes if ((ADCSRA & ADSC) == 0) { // BAT- - const uint16_t adc_value_1 = ((uint16_t)ADCH << 8) | ADCL; + const uint8_t adcl = ADCL; + const uint16_t adc_value_1 = ((uint16_t)ADCH << 8) | adcl; adc_state = adc_state_t::IDLE; send_voltage(ADC_VALUE_TO_MILLIVOLT(adc_value_1) * 4, false, time_now); |