eeprom.c

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#ifdef __cplusplus
extern "C"
{
#endif /* __cplusplus */

/*----- Header-Files -------------------------------------------------------*/
#include <stm32f4xx.h>              /* Processor STM32F407IG                */
#include <carme.h>                  /* CARME Module                         */
#include <i2c.h>                    /* CARME I2C definitions                */
#include <eeprom.h>                 /* CARME EEPROM                         */

/*----- Macros -------------------------------------------------------------*/

/*----- Data types ---------------------------------------------------------*/

/*----- Function prototypes ------------------------------------------------*/

/*----- Data ---------------------------------------------------------------*/

/*----- Implementation -----------------------------------------------------*/
ERROR_CODES CARME_EEPROM_Write(uint8_t *data, uint8_t nbrOfChar,
                               uint8_t startAddress) {

    uint8_t charstoWrite;
    uint32_t timeout;
    uint32_t i;

    /*Set timeout to ~6ms*/
    timeout = 200000;

    if ((startAddress + nbrOfChar) > 0x07FF) {
        return CARME_ERROR_EEPROM_OVERFLOW;
    }

    /*Align to Page*/
    charstoWrite = startAddress % 8;
    if (charstoWrite > 0) {
        charstoWrite = 8 - charstoWrite;
        CARME_I2C_Write(CARME_I2C_BOARD, CARME_EEPROM_I2C_ADDRESS,
                        startAddress, 1, (uint8_t *) data, charstoWrite);

        /*delay*/
        for (i = 0; i < timeout; i++)
            ;

        nbrOfChar -= charstoWrite;
        data += charstoWrite;
        startAddress += charstoWrite;
    }

    while (nbrOfChar > 0) {
        if (nbrOfChar > 8) {
            charstoWrite = 8;
        }
        else {
            charstoWrite = nbrOfChar;
        }
        /*Write the remaining bytes*/
        CARME_I2C_Write(CARME_I2C_BOARD, CARME_EEPROM_I2C_ADDRESS,
                        startAddress, 1, (uint8_t *) data, charstoWrite);

        /*delay*/
        for (i = 0; i < timeout; i++)
            ;

        nbrOfChar -= charstoWrite;
        data += charstoWrite;
        startAddress += charstoWrite;

    }

    return CARME_NO_ERROR;
}

ERROR_CODES CARME_EEPROM_Read(uint8_t *recdata, uint8_t nbrOfChar,
                              uint8_t startAddress) {

    if ((startAddress + nbrOfChar) > 0x07FF) {
        return CARME_ERROR_EEPROM_OVERFLOW;
    }

    if (CARME_I2C_Read(CARME_I2C_BOARD, CARME_EEPROM_I2C_ADDRESS,
                       startAddress, 1, (uint8_t *) recdata, nbrOfChar)) {
        return CARME_ERROR_EEPROM_BUSY;
    }

    return CARME_NO_ERROR;
}

#ifdef __cplusplus
}
#endif /* __cplusplus */