/**
* Get the number of oversample bits previously configured.
* This gets the number of oversample bits from the FPGA. The actual number of
* oversampled values is
* 2^bits. The oversampling is done automatically in the FPGA.
*
* @return Number of bits of oversampling previously configured.
*/
uint32_t AnalogInput::GetOversampleBits() const {
if (StatusIsFatal()) return 0;
int32_t status = 0;
int32_t oversampleBits = getAnalogOversampleBits(m_port, &status);
wpi_setErrorWithContext(status, getHALErrorMessage(status));
return oversampleBits;
}
/**
* Get a scaled sample from the output of the oversample and average engine for the channel.
*
* The value is scaled to units of Volts using the calibrated scaling data from GetLSBWeight() and GetOffset().
* Using oversampling will cause this value to be higher resolution, but it will update more slowly.
* Using averaging will cause this value to be more stable, but it will update more slowly.
*
* @param analog_port_pointer Pointer to the analog port to use.
* @return A scaled sample from the output of the oversample and average engine for the channel.
*/
float getAnalogAverageVoltage(void* analog_port_pointer, int32_t *status) {
int32_t value = getAnalogAverageValue(analog_port_pointer, status);
uint32_t LSBWeight = getAnalogLSBWeight(analog_port_pointer, status);
int32_t offset = getAnalogOffset(analog_port_pointer, status);
uint32_t oversampleBits = getAnalogOversampleBits(analog_port_pointer, status);
float voltage = ((LSBWeight * 1.0e-9 * value) / (float)(1 << oversampleBits)) - offset * 1.0e-9;
return voltage;
}
/*
* Class: edu_wpi_first_wpilibj_hal_AnalogJNI
* Method: getAnalogOversampleBits
* Signature: (Ljava/nio/ByteBuffer;Ljava/nio/IntBuffer;)I
*/
JNIEXPORT jint JNICALL Java_edu_wpi_first_wpilibj_hal_AnalogJNI_getAnalogOversampleBits
(JNIEnv * env, jclass, jobject id, jobject status)
{
void ** javaId = (void**)env->GetDirectBufferAddress(id);
ANALOGJNI_LOG(logDEBUG) << "Analog Ptr = " << *javaId;
jint * statusPtr = (jint*)env->GetDirectBufferAddress(status);
jint returnValue = getAnalogOversampleBits( *javaId, statusPtr );
ANALOGJNI_LOG(logDEBUG) << "Status = " << *statusPtr;
ANALOGJNI_LOG(logDEBUG) << "OversampleBits = " << returnValue;
return returnValue;
}
