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AP_ADC_AnalogSource: fixed reference scaling for APM1 Ch6 ADC

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it is not referenced to Vcc
This commit is contained in:
Andrew Tridgell 2013-03-08 09:06:40 +11:00
parent 2fc922a251
commit bf1944a36d
1 changed files with 3 additions and 3 deletions
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6
libraries/AP_ADC_AnalogSource/AP_ADC_AnalogSource.cpp
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@ -22,10 +22,10 @@ float AP_ADC_AnalogSource::read_average() {
*/
float AP_ADC_AnalogSource::voltage_average()
{
float vcc_mV = hal.analogin->channel(ANALOG_INPUT_BOARD_VCC)->read_average();
float fullscale = _adc->Ch(_ch);
// note that the Ch6 ADC on APM1 has a 3.3V range
return fullscale * vcc_mV * (3.3/5.0) * 2.44140625e-7f; // 1.0/(4096*1000)
// note that the Ch6 ADC on APM1 has a 3.3V range, and is against
// an internal reference, not the 5V power supply
return fullscale * 3.3 * 2.44140625e-4f;
}