strain_gauge.c
0f86d839a050highres-probe

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);
			}