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AP_HAL_AVR: AnalogIn hack to make vcc read work

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* needs improvment
This commit is contained in:
Pat Hickey 2012-12-04 15:53:14 -08:00 committed by Andrew Tridgell
parent 6e45ce12b2
commit 0b7a55b9f6
1 changed files with 8 additions and 1 deletions
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9
libraries/AP_HAL_AVR/AnalogIn_ADC.cpp
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@ -13,7 +13,14 @@ ADCSource::ADCSource(uint8_t pin, float prescale) :
{}
float ADCSource::read() {
return _prescale * read_average();
if (_pin == ANALOG_INPUT_BOARD_VCC) {
// XXX we really want a version of this which is using the raw voltage
// and a different one for the low passed average vcc
uint16_t v = (uint16_t) read_average();
return 1126400UL / v;
} else {
return _prescale * read_average();
}
}
void ADCSource::set_pin(uint8_t pin) {