eeprom.c

/*
 * eeprom.c
 *
 *  Created on: 04-Jan-2021
 *      Author: DEVJEET MANDAL
 */

#include "i2c.h"
#include "eeprom.h"

#include "stdio.h"
#include "stdlib.h"

/* Low Level function */
void eep_small_delay(void)          {
    for (uint32_t i = 0; i < 65535; i++)
        __asm__("NOP");
}

void i2c_error(void)    {
    HAL_I2C_DeInit(&hi2c1);     //De-init i2c bus
    __asm__("NOP");
    HAL_I2C_Init(&hi2c1);       //re-init i2c bus
    __asm__("NOP");
}

eep_status_t i2c_write(uint16_t u8_reg_addr, uint8_t *u8_data, uint16_t len)            {
    HAL_StatusTypeDef xStatus = HAL_ERROR;
    xStatus = HAL_I2C_Mem_Write(&hi2c1, EEPROM_ADDRESS, u8_reg_addr, I2C_MEMADD_SIZE_16BIT, u8_data, len, 100);
    HAL_Delay(10);
    if (xStatus != HAL_OK)  {i2c_error();}
    return xStatus;
}

eep_status_t i2c_read(uint16_t u8_reg_addr, uint8_t *u8_data, uint16_t len)         {
    HAL_StatusTypeDef xStatus = HAL_ERROR;
    xStatus = HAL_I2C_Mem_Read(&hi2c1, EEPROM_ADDRESS, u8_reg_addr, I2C_MEMADD_SIZE_16BIT, u8_data, len, 100);
    eep_small_delay();
    if (xStatus != HAL_OK)  {i2c_error();}
    return xStatus;
}

/* High Level Functions */
eep_status_t eep_write_byte(uint16_t u8_reg_addr, uint8_t u8_data)      {
    return i2c_write(u8_reg_addr, &u8_data, 1);
}

eep_status_t eep_read_byte(uint16_t u8_reg_addr, uint8_t *u8_data)      {
    return i2c_read(u8_reg_addr, u8_data, 1);
}

eep_status_t eep_is_data_avaiable(void)                     {
    eep_status_t xStatus = EEP_ERROR;
    uint8_t data = 0;
    eep_read_byte(EEPROM_DATA_AVAILABLE_ADDR, &data);
    if (data == 0)      {xStatus = EEP_ERROR;}
    else if (data == 1) {xStatus = EEP_OK;}
    else                {xStatus = EEP_ERROR;}
    return xStatus;
}

eep_status_t eep_set_data_available(uint8_t val)            {
    return eep_write_byte(EEPROM_DATA_AVAILABLE_ADDR, val);
}

eep_status_t eep_write_word(uint16_t reg_addr, uint32_t value)      {
    uint8_t val_byte[4] = {0};
    val_byte[0] = (value >> 24) & 0xFF;
    val_byte[1] = (value >> 16) & 0xFF;
    val_byte[2] = (value >> 8) & 0xFF;
    val_byte[3] = (value >> 0) & 0xFF;
    return i2c_write(reg_addr, val_byte, 4);
}

eep_status_t eep_write_float(uint16_t reg_addr, float value)        {
    union FtoHex{
        float fval;
        uint32_t hval;
    }float_to_hex;

    float_to_hex.fval = value;
    return eep_write_word(reg_addr, float_to_hex.hval);
}

uint32_t eep_read_word(uint16_t reg_addr)                   {
    uint8_t val_buff[4] = {0};
    i2c_read(reg_addr, val_buff, 4);
    return ((val_buff[0] << 24) | (val_buff[1] << 16) | (val_buff[2] << 8) | (val_buff[3] << 0));
}

float eep_read_float(uint8_t reg_addr)  {
    union FtoHex{
        float fval;
        uint32_t hval;
    }float_to_hex;

    float_to_hex.hval = eep_read_word(reg_addr);
    return float_to_hex.fval;
}

void eep_write_string(uint16_t reg_addr, uint8_t *src, uint16_t len)        {
    i2c_write(reg_addr, src, len);
}

void eep_read_string(uint16_t reg_addr, uint8_t *dest, uint16_t len)            {
    i2c_read(reg_addr, dest, len);
}

//---------------------------------------------------------------------