#ifndef BQ_COM
#define BQ_COM

#include "BQ_Register_Definitions.h"

#include "stm32f4xx_hal.h"

#define FRM_WRT_NR 0x90
#define FRM_WRT_R 0x81

#define DEFAULTNUMOFCELLS 10
#define DEFAULTNUMOFDIETEMPS 0

#define BQUARTTIMEOUT 200

typedef enum { BQ_COMM_OK, BQ_COMM_ERR_HAL, BQ_COMM_ERR_CRC } BQ_Comm_Status;

/**
 * @brief Defines UART and DMA Handle
 *
 * Always call the init routine before using any other function of the libary.
 */
void init_BQCom(UART_HandleTypeDef* uarthandle);

/**
 * @brief Calculate CRC according to BQ spec.
 *
 * @param message_buffer Message buffer, including two bytes for the CRC. The
 * CRC will be written to the last two bytes.
 * @param bufferlength The length of message_buffer, including the two bytes for
 * the CRC.
 *
 * @return 0 if the buffer is to small
 * @return 1 if the function was successful
 */
uint16_t Calculate_CRC(uint8_t* message_buffer, uint16_t bufferlength);
/**
 * @brief Checks if the CRC is correct
 *
 * @return 0 if the Buffer is too small or the CRC is incorrect
 * @return 1 if the CRC is correct
 */
uint16_t Check_CRC(uint8_t* message_buffer, uint16_t bufferlength);

/**
 * @brief Writes data to a register of the BQ76.
 *
 * @param registeraddress specifies the register. Address definitions are
 * available in BQ_Register_Definitions.h
 * @param registersize defines the register size in bytes.
 * @param data defines the data written to the BQ
 */
uint32_t BQ_Write_Register(uint8_t registeraddress, uint8_t registersize,
                           uint32_t data);
/**
 * @brief Read the data of a register specified by its address
 *
 * @param registeraddress specifies the register. Address definitions are
 * available in BQ_Register_Definitions.h
 * @param registersize defines the register size in bytes.
 */
uint8_t BQ_Read_Register(uint8_t registeraddress, uint8_t registersize,
                         uint32_t* data);
/**
 * @brief Reads Voltage Measurements from the BQ76
 *
 * Result are Written into the Buffer
 * Buffer size should be 2xMeasured Voltages
 */
BQ_Comm_Status BQ_ReadMeasurements(uint8_t* buffer, uint8_t bufferlength);

/**
 * @brief Hardware layer implementation of the UART transmit
 */
uint8_t BQ_UART_Transmit(uint8_t* message_buffer, uint16_t bufferlength);
/**
 * @brief Hardware layer implementation of the UART receive
 */
uint8_t BQ_UART_Receive(uint8_t* message_buffer, uint16_t bufferlength);

#endif