writing and reading from I2c eeprom ?

[RixtronixLAB]

Dear Members,

Where can I find from software development kit the example for writing and reading from I2C EEPROM ?

Thanks

[awneil]

RixtronixLAB said:

Is it conflict

As always, it's important to start simple; solve one problem at a time - don't leap straight into a whole pile of potential problems!

https://www.avrfreaks.net/forum/help-it-doesnt-work

So start with just the EEPROM on the bus - nothing else.

[RixtronixLAB]

I can write it,

but it's not complete , is it related with timing ?

The output when reading 

nfo> app: 7E0:
                                                              

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: 07
                                                                

nfo> app: AD
                                         

I want to write al 0xAD but only the end is AD ??

Code :

* Function uses the TWI interface to write data into EEPROM memory.
 *
 * @param     addr  Start address to write.
 * @param[in] pdata Pointer to data to send.
 * @param     size  Byte count of data to send.
 * @attention       Maximum number of bytes that may be written is @ref EEPROM_SEQ_WRITE_MAX.
 *                  In sequential write, all data must be in the same page
 *                  (higher address bits do not change).
 *
 * @return NRF_SUCCESS or reason of error.
 *
 * @attention If you wish to communicate with real EEPROM memory chip, check its readiness
 * after writing the data.
 */
static ret_code_t eeprom_write(uint16_t addr, uint8_t const * pdata, size_t size)
{
    ret_code_t ret;
    /* Memory device supports only a limited number of bytes written in sequence */
    if (size > (EEPROM_SEQ_WRITE_MAX_BYTES))
    {
        return NRF_ERROR_INVALID_LENGTH;
    }
    /* All written data must be in the same page */
    if ((addr / (EEPROM_SEQ_WRITE_MAX_BYTES)) != ((addr + size - 1) / (EEPROM_SEQ_WRITE_MAX_BYTES)))
    {
        return NRF_ERROR_INVALID_ADDR;
    }
    do
    {
			  nrf_delay_ms(25);
        uint8_t buffer[EEPROM_ADDRESS_LEN_BYTES + EEPROM_SEQ_WRITE_MAX_BYTES]; /* Addr + data */

        memcpy(buffer, &addr, EEPROM_ADDRESS_LEN_BYTES);
        memcpy(buffer + EEPROM_ADDRESS_LEN_BYTES, pdata, size);
        ret = nrf_drv_twi_tx(&m_twi_master, EEPROM_ADDR, buffer, size + EEPROM_ADDRESS_LEN_BYTES, false);
			  
    }while (0);
    return ret;
}

void eeprom_cmd_clear()
{
    

    uint8_t clear_val = 0xAD;
    size_t addr;

    for (addr = 0; addr <EEPROM_SIZE; ++addr)
    {
        ret_code_t err_code;
        err_code = eeprom_write(addr, &clear_val, 1);
			   if (NRF_SUCCESS != err_code)
        {
					NRF_LOG_INFO("communication error 24C16 By Rixtronix LAB.\r\n");
          NRF_LOG_INFO("Error code %u",err_code);  
            return;
        }
        NRF_LOG_INFO("CLEARING 24C16 By Rixtronix LAB...\r\n");
    }
		NRF_LOG_INFO("FINISHED CLEARING 24C16 By Rixtronix LAB.\r\n");
    
}

What do I miss here  ?

Thanks

[RixtronixLAB]

#define EEPROM_SEQ_WRITE_MAX_BYTES    200
#define EEPROM_ADDR                   0x50
#define EEPROM_ADDRESS_LEN_BYTES   2
#define EEPROM_SIZE                   (2048u) //!< 24C16 EEPROM size.
#define MASTER_TWI_INST     0       //!< TWI interface used as a master accessing EEPROM memory.
#define IN_LINE_PRINT_CNT   (16u)   //!< Number of data bytes printed in a single line.

[0_velan_1]

i  am also facing this issue now how would i solve

[awneil]

devzone.nordicsemi.com/.../311356