adc.h

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/**
 *
 * @copyright © 2010 - 2021, Fraunhofer-Gesellschaft zur Foerderung der
 *  angewandten Forschung e.V. All rights reserved.
 *
 * BSD 3-Clause License
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 * modification, are permitted provided that the following conditions are met:
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 *     this software without specific prior written permission.
 *
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/**
 * @file    adc.h
 * @author  foxBMS Team
 * @date    2019-01-07 (date of creation)
 * @updated 2021-03-24 (date of last update)
 * @ingroup DRIVERS
 * @prefix  ADC
 *
 * @brief   Headers for the driver for the ADC module.
 *
 */
 
#ifndef FOXBMS__ADC_H_
#define FOXBMS__ADC_H_
 
/*========== Includes =======================================================*/
#include "general.h"
 
#include "battery_system_cfg.h"
 
#include "io.h"
#include "spi.h"
 
/*========== Macros and Definitions =========================================*/
 
/** HET1 GIO register that the ADC is connected to. */
#define ADC_HET1_GIO (hetREG1)
/** Pin of HET1 that the ADC Reset is connected to. */
#define ADC_HET1_RESET_PIN (28U)
 
/** Voltage reference used by ADC0 */
#define ADC_VREF_1 (2.5f)
/** Voltage reference used by ADC1 */
#define ADC_VREF_2 (4.096f)
/** ADC digital gain, set in registers 0x11 to 0x14 */
#define ADC_GAIN (1.0f)
 
/**
 * Size of SPI messages used to send commands to the ADC
 * Example of commands: NULL, read or write register, lock, unlock...
 */
#define SINGLE_MESSAGE_LENGTH (2U)
/** Size of SPI messages used to retrieve conversion results of the ADC */
#define CONVERT_LENGTH (10U)
/** Number of channels measured by the ADC. ADS131A04 has four channels. */
#define ADC_NUMBER_OF_CHANNELS (4U)
 
/**
 * State for the ADC conversion
 */
typedef enum {
    ADC_INIT,
    ADC_ENDINIT,
    ADC_READY,
    ADC_UNLOCK,
    ADC_UNLOCKED,
    ADC_WRITE_ADC_ENA,
    ADC_READ_ADC_ENA,
    ADC_CHECK_ADC_ENA,
    ADC_WAKEUP,
    ADC_LOCK,
    ADC_CONVERT_1,
    ADC_CONVERT_2,
} ADC_STATE_e;
 
/*========== Extern Constant and Variable Declarations ======================*/
 
/*========== Extern Function Prototypes =====================================*/
 
/**
 * @brief   initializes the ADC devices. It is called during startup.
 */
extern void ADC_Initialize(void);
 
/**
 * @brief   determines which ADC is measured and stores result in database.
 * @details It alternates between measurement on ADC1 and ADC2. Measurement
 *          read by SPI.
 */
extern void ADC_Control(void);
 
/*========== Externalized Static Functions Prototypes (Unit Test) ===========*/
 
#endif /* FOXBMS__ADC_H_ */