strain_gauge.c
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	#include "strain_gauge.h"
	#include "dac.h"
	#include "../lib/basic_filter.h"

	AdcChannel sg_channel;
	bfilt_BasicFilter sg_filt;

	/**
	* @brief Initialize the strain gauge driver.
	* @param channel: the ADC channel the strain gauge is wired to (0 or 1).
	*/
	void sg_Init(AdcChannel channel)
	{
	sg_channel = channel;

	dac_SetVoltage2(2.4f);

	bfilt_Init(&sg_filt, 0.1f, 0.0f);
	}

	/**
	* @brief Return the measured force on the paddle.
	* @retval The force applied to the top of the paddle [N].
	* @warning this function is not implemented yet, and returns actually the raw
	* voltage from the sensor, instead of the ready-to-use force.
	*/
	float32_t sg_Get(void)
	{
	float32_t voltage = adc_GetChannelVoltage(sg_channel, ADC_SCALE_0_033_V);

	// TODO: the voltage to angle conversion is not implemented yet.
	return bfilt_Step(&sg_filt, voltage);
	}