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 *
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 *
 * @file combridge.c
 *
 * @brief This file contains the serial communication interface (e.g. SPI and I2C) functions. 
 * Messages can be read and written. In addition, there is a waiting mechanism that waits for a defined time.
 */


/* Includes ------------------------------------------------------------------*/
#include "combridge.h"
#include "main.h"
#include <stdlib.h>


/* Private define ------------------------------------------------------------*/
/* BMV080 I2C address
 * note that the BMV080 pins are connected such that I2C Address Bit 0 = 0 and I2C Address Bit 1 = 0 
 */
#define BMV080_I2C_ADDRESS 0x54


/* Exported functions --------------------------------------------------------*/
int8_t combridge_spi_read_16bit(bmv080_sercom_handle_t handle, uint16_t header, uint16_t *payload, uint16_t payload_length)
{
    HAL_StatusTypeDef return_value;
    SPI_HandleTypeDef *spi_handle = (SPI_HandleTypeDef *)handle;

    /* verify function parameters */
    if ((handle == NULL) || (payload == NULL))
    {
        return HAL_ERROR;
    }

    if ((payload_length == 0))
    {
        return HAL_ERROR;
    }

    HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_RESET);
    return_value = HAL_SPI_Transmit(spi_handle, (uint8_t *)(&header), 1, HAL_MAX_DELAY);
    if (return_value == HAL_OK)
    {
        return_value = HAL_SPI_Receive(spi_handle, (uint8_t *)payload, payload_length, HAL_MAX_DELAY);
    }
    HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_SET);

    return (int8_t)return_value;
}


int8_t combridge_spi_write_16bit(bmv080_sercom_handle_t handle, uint16_t header, const uint16_t *payload, uint16_t payload_length)
{
    HAL_StatusTypeDef return_value;
    SPI_HandleTypeDef *spi_handle = (SPI_HandleTypeDef *)handle;

    /* verify function parameters */
    if ((handle == NULL) || (payload == NULL))
    {
        return HAL_ERROR;
    }

    if ((payload_length == 0))
    {
        return HAL_ERROR;
    }

    HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_RESET);
    return_value = HAL_SPI_Transmit(spi_handle, (uint8_t *)(&header), 1, HAL_MAX_DELAY);
    if (return_value == HAL_OK)
    {
        return_value = HAL_SPI_Transmit(spi_handle, (uint8_t *)payload, payload_length, HAL_MAX_DELAY);
    }
    HAL_GPIO_WritePin(CS_GPIO_Port, CS_Pin, GPIO_PIN_SET);

    return (int8_t)return_value;
}


int8_t combridge_i2c_read_16bit(bmv080_sercom_handle_t handle, uint16_t header, uint16_t *payload, uint16_t payload_length)
{
    HAL_StatusTypeDef return_value;
    I2C_HandleTypeDef *i2c_handle = (I2C_HandleTypeDef *)handle;

    /* verify function parameters */
    if ((handle == NULL) || (payload == NULL))
    {
        return HAL_ERROR;
    }

    if ((payload_length == 0))
    {
        return HAL_ERROR;
    }
    
    /* 7 bit I2C address + most significant bit of the header passed from the sensor driver which represents the R/W bit (R = high) */
    uint16_t device_address = (BMV080_I2C_ADDRESS << 1) | (header >> 15);
    /* 16 bit header left shifted, since the R/W bit has already been passed */
    uint16_t header_adjusted = header << 1;

    return_value = HAL_I2C_Mem_Read(i2c_handle, device_address, header_adjusted, I2C_MEMADD_SIZE_16BIT, (uint8_t *)payload, payload_length * 2, HAL_MAX_DELAY);
    
    /* Conversion of payload from big endian to little endian */
    for(int payload_idx = 0; payload_idx < payload_length; payload_idx++)
    {
        uint16_t swapped_word = ((payload[payload_idx] << 8)| (payload[payload_idx] >> 8)) & 0xffff;
        payload[payload_idx] = swapped_word;
    }

    return (int8_t)return_value;
}


int8_t combridge_i2c_write_16bit(bmv080_sercom_handle_t handle, uint16_t header, const uint16_t *payload, uint16_t payload_length)
{
    HAL_StatusTypeDef return_value;
    I2C_HandleTypeDef *i2c_handle = (I2C_HandleTypeDef *)handle;

    /* verify function parameters */
    if ((handle == NULL) || (payload == NULL))
    {
        return HAL_ERROR;
    }

    if ((payload_length == 0))
    {
        return HAL_ERROR;
    }

    /* 7 bit I2C address + most significant bit of the header passed from the sensor driver which represents the R/W bit (R = high) */
    uint16_t device_address = (BMV080_I2C_ADDRESS << 1) | (header >> 15);
    /* 16 bit header left shifted, since the R/W bit has already been passed */
    uint16_t header_adjusted = header << 1;

    /* Conversion of payload from little endian to big endian (dynamic allocation is used) */
    uint16_t *payload_swapped = (uint16_t *)calloc(payload_length, sizeof(uint16_t));
    for(int payload_idx = 0; payload_idx < payload_length; payload_idx++)
    {
        payload_swapped[payload_idx] =  ((payload[payload_idx] << 8)| (payload[payload_idx] >> 8)) & 0xffff;
    }
    

    return_value = HAL_I2C_Mem_Write(i2c_handle, device_address, header_adjusted, I2C_MEMADD_SIZE_16BIT, (uint8_t *)payload_swapped, payload_length * 2, HAL_MAX_DELAY);

    free(payload_swapped);

    return (int8_t)return_value;
}


int8_t combridge_delay(uint32_t period)
{
    HAL_Delay(period);
    return HAL_OK;
}
