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adc.h
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Wed, Aug 21, 18:32

adc.h
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#ifndef __ADC_H
#define __ADC_H
#include "../main.h"
#define ADC1_Input_Pin GPIO_Pin_4 // Analog diff. input 1
#define ADC1_Input_Port GPIOC
#define ADC1_Input_Chan ADC_Channel_14
#define ADC2_Input_Pin GPIO_Pin_5 // Analog diff. input 2
#define ADC2_Input_Port GPIOC
#define ADC2_Input_Chan ADC_Channel_15
#define ADC_Current_Sens_Pin GPIO_Pin_3 // Current sense channel
#define ADC_Current_Sens_Port GPIOA
#define ADC_Current_Sens_Chan ADC_Channel_3
#define ADC_MAX 4095 // Maximum value of the ADC register (2^12 - 1).
#define ADC_MAX_CONVERSION_TIME 100 // To avoid locking if the conversion was not started properly.
#define ADC_BUFFER_SIZE 33 // Fadc =~300kHz -> TE_ADC = 3.33us -> Average over 32 sample => usable bandwidth <10kHz
#define ADC_CURRENT_SCALE (STM_SUPPLY_VOLTAGE / (CURRENT_SHUNT_RESISTANCE * CURRENT_SHUNT_AMPLIFIER_GAIN * ADC_MAX)) // Scale between ADC increment and current [A/incr].
#define ADC_CALIB_N_SAMPLES 1000
/** @defgroup ADC Driver / ADC
* @brief Driver for the analog-to-digital peripheral of the STM32.
*
* An analog-to-digital converter (ADC) is used to measure the voltage of one
* or several microcontroller pins. In the HRI board, there are two pins that
* can be used. An intermediate electronic stage allows to modify the input
* range from +-33mV to +-10V, in order to get the best sensitivity and range
* for a wide range of analog sensors. Note that the input connector
* (J2-ANALOG IN) provides differential inputs, so one pair of pins per
* channel.
*
* In addition, there is an additional channel to measure the current going
* through the motor (useful for current regulation).
*
* Call adc_Init() first, in the initialization code. Then, call
* adc_GetChannelVoltage() every time you need the voltage.
*
* To measure accurately the motor current, a calibration has to be performed
* first. Call dc_CalibrateCurrentSens() in the main(), when the current
* regulation is disabled (see H-bridge documentation). Then, call
* adc_GetCurrent() every time it is needed. This function returns the last
* value transfered by the DMA, so there is no conversion delay when calling
* this function.
*
* @addtogroup ADC
* @{
*/
// Switches-selectable scale of the ADC circuit.
// Could be useful to perform a calibration, to precise readings.
#define ADC_SCALE_0_033_V 0.033f ///< +-33mV, switches position: 0100
#define ADC_SCALE_0_165_V 0.165f ///< +-165mV, switches position: 0010
#define ADC_SCALE_0_400_V 0.400f ///< +-400mV, switches position: 1100
#define ADC_SCALE_0_830_V 0.830f ///< +-830mV, switches position: 0001
#define ADC_SCALE_2_V 2.000f ///< +-2V, switches position: 1010
#define ADC_SCALE_10_V 10.00f ///< +-10V, switches position: 1001
/**
* @brief Enum that corresponds to the two ADC input channels of the board.
*/
typedef enum
{
ANIN1=1, ///< Channel 1, pins ANIN1+ (3) and ANIN1- (4) of the connector J2.
ANIN2=2 ///< Channel 2, pins ANIN2+ (7) and ANIN2- (8) of the connector J2.
} AdcChannel;
void adc_Init(void);
void adc_CalibrateCurrentSens(void);
float32_t adc_GetCurrent(void); // [mA].
float32_t adc_GetChannelVoltage(AdcChannel channel, float32_t scale);
/**
* @}
*/
#endif

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