/**
* Get the number of active channels.
*
* This is an internal function to allow the atomic update of both the
* number of active channels and the sample rate.
*
* When the number of channels changes, use the new value. Otherwise,
* return the curent value.
*
* @return Value to write to the active channels field.
*/
uint32_t getAnalogNumChannelsToActivate(int32_t* status) {
if (analogNumChannelsToActivate == 0)
return getAnalogNumActiveChannels(status);
return analogNumChannelsToActivate;
}
/**
* Get the current sample rate.
*
* This assumes one entry in the scan list.
* This is a global setting for the Athena and effects all channels.
*
* @return Sample rate.
*/
float getAnalogSampleRate(int32_t *status) {
uint32_t ticksPerConversion = analogInputSystem->readLoopTiming(status);
uint32_t ticksPerSample = ticksPerConversion * getAnalogNumActiveChannels(status);
return (float)kTimebase / (float)ticksPerSample;
}
