n775_cfg.h

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/**
 *
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 *
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/**
 * @file    n775_cfg.h
 * @author  foxBMS Team
 * @date    2020-05-08 (date of creation)
 * @updated 2021-03-24 (date of last update)
 * @ingroup DRIVERS_CONFIGURATION
 * @prefix  N775
 *
 * @brief   Header for the configuration for the MC33775A monitoring chip.
 *
 */
 
#ifndef FOXBMS__N775_CFG_H_
#define FOXBMS__N775_CFG_H_
 
/*========== Includes =======================================================*/
#include "battery_system_cfg.h"
 
#include "n775_defs.h"
#include "nxp_mic_dma.h"
#include "spi.h"
 
/*========== Macros and Definitions =========================================*/
 
/**
 * Number of used N775-ICs
 */
#define N775_N_N775 (BS_NR_OF_MODULES)
 
/**
 * Number of N775-ICs per battery module
 */
#define N775_NUMBER_OF_N775_PER_MODULE (1u)
 
/**
 * 775A Tx message length in bytes.
 */
#define N775_TX_MESSAGE_LENGTH (7u)
 
/**
 * 775A Rx message length in bytes.
 */
#define N775_RX_MESSAGE_LENGTH (4u)
 
/**
 * 775A maximum number of cell voltages that can be measured.
 */
#define N775_MAX_NUMBER_OF_VOLTAGES (14u)
 
/**
 * Timeout in milliseconds added to the transmission time for interrupt-based
 * SPI transmission.
 */
#define N775_TRANSMISSION_TIMEOUT (10u)
 
/**
 * SPI1 is used for communication with N775
 * @{
 */
#define N775_SPI_HANDLE &spi_devices[0]
 
#define N775_SPI_INSTANCE *N775_SPI_HANDLE.Instance
 
#define N775_SPI_PRESCALER *N775_SPI_HANDLE.Init.BaudRatePrescaler
/**@}*/
 
/**
 * N775 statemachine short time definition in ms
 */
#define N775_STATEMACH_SHORTTIME (1u)
 
/**
 * N775 Maximum time from wakeup event to possible communication in ms
 * 2.4ms in datasheet
 */
#define N775_TWAKECOM_MS (3u)
 
/**
 * N775 Time between two consecutive wake-up messages in ms
 * 4ms in datasheet
 */
#define N775_TDWAKE_MS (4u)
 
/**
 * N775 time for daisy-chain to wake-up in ms
 */
#define N775_TIME_DAISYCHAIN_WAKEUP_MS (N775_N_N775 * (N775_TWAKECOM_MS + N775_TDWAKE_MS))
 
/**
 * N775 time between two wake up commands in ms
 */
#define N775_TIME_BETWEEN_WAKEUP_MS (4u)
 
/**
 * N775 time after enumeraiton in ms
 */
#define N775_TIME_AFTER_ENUMERATION_MS (1u)
 
/**
 * Maximum number of re-tries in case of SPI error during the communication with daisy chain
 * before going into error state
 */
#define N775_TRANSMIT_SPIERRLIMIT (3u)
 
/**
 * Max number of Bytes to be received from daisy-chain
 * This limit is not due to the hardware.
 * It is only to set the length of the receive buffer for DMA.
 */
#define N775_MAX_N_BYTES_FOR_DATA_RECEPTION (N775_TX_MESSAGE_LENGTH * N775_MAX_NUMBER_OF_VOLTAGES)
 
/**
 * Transmit functions
 */
#define N775_SendData(txbuf, rxbuf, length) SPI_TransmitReceiveDataDma(&spi_nxp775Interface, txbuf, rxbuf, length)
 
/*========== Extern Constant and Variable Declarations ======================*/
 
/**
 * Lookup table to indicate which voltage inpus are used
 */
extern const uint8_t n775_voltage_input_used[BS_MAX_SUPPORTED_CELLS];
 
/*========== Extern Function Prototypes =====================================*/
 
/**
 * @brief   converts a raw voltage from multiplexer to a temperature value in Celsius.
 *
 * The temperatures are read from NTC elements via voltage dividers.
 * This function implements the look-up table between voltage and temperature,
 * taking into account the NTC characteristics and the voltage divider.
 *
 * @param   v_adc_V         voltage read from the multiplexer in V
 *
 * @return  temperature     temperature value in deci °C
 */
extern float N775_Convert_MuxVoltages_to_Temperatures(float v_adc_V);
 
/*========== Externalized Static Functions Prototypes (Unit Test) ===========*/
 
#endif /* FOXBMS__N775_CFG_H_ */