pex.h

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 *
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/**
 * @file    pex.h
 * @author  foxBMS Team
 * @date    2021-08-02 (date of creation)
 * @updated 2021-10-04 (date of last update)
 * @ingroup DRIVERS
 * @prefix  PEX
 *
 * @brief   Header for the driver for the NXP PCA9539 port expander module
 *
 */
 
#ifndef FOXBMS__PEX_H_
#define FOXBMS__PEX_H_
 
/*========== Includes =======================================================*/
 
#include "pex_cfg.h"
 
/*========== Macros and Definitions =========================================*/
/** Port expander pin high levels in registers
 * @{*/
#define PEX_PIN_LOW  (0u)
#define PEX_PIN_HIGH (1u)
/**@}*/
 
/*========== Extern Constant and Variable Declarations ======================*/
 
/*========== Extern Function Prototypes =====================================*/
 
/**
 * @brief   initialize local variable containing state of port expander.
 *
 */
extern void PEX_Initialize(void);
 
/**
 * @brief   sets pin to high.
 * @param   portExpander    port expander number
 * @param   pin             pin number
 */
extern void PEX_SetPin(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   sets pin to low.
 * @param   portExpander    port expander number
 * @param   pin             pin number
 *
 */
extern void PEX_ResetPin(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   get pin state of port expander pins.
 * @return  pin state: #PEX_PIN_LOW or #PEX_PIN_HIGH
 */
extern uint8_t PEX_GetPin(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   sets pin direction to input.
 * @param   portExpander    port expander number
 * @param   pin             pin number
 */
extern void PEX_SetPinDirectionInput(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   sets pin to input.
 * @param   portExpander    port expander number
 * @param   pin             pin number
 */
extern void PEX_SetPinDirectionOutput(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   sets pin polarity to inverted.
 * @param   portExpander    port expander number
 * @param   pin             pin number
 */
extern void PEX_SetPinPolarityInverted(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   sets pin polarity to retained.
 * @param   portExpander    port expander number
 * @param   pin             pin number
 */
extern void PEX_SetPinPolarityRetained(uint8_t portExpander, uint8_t pin);
 
/**
 * @brief   implements reading/writing to the port expander registers.
 * @details This function reads the desired port expander state (outputs,
 *          configuration) from the externally available variables and stores
 *          it in the local variable. It then applies this state to the devices
 *          via the I2C bus. It reads the pin input state via the I2C bus and
 *          writes it to the externally available port expander state.
 */
extern void PEX_Trigger(void);
 
/*========== Externalized Static Functions Prototypes (Unit Test) ===========*/
#ifdef UNITY_UNIT_TEST
#endif
 
#endif /* FOXBMS__PEX_H_ */