writing and reading from I2c eeprom ?

RE: writing and reading from I2c eeprom ?

awneil — Thu, 27 May 2021 08:08:07 GMT

devzone.nordicsemi.com/.../311356

RE: writing and reading from I2c eeprom ?

0_velan_1 — Thu, 27 May 2021 07:53:45 GMT

i am also facing this issue now how would i solve

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Thu, 21 Jan 2021 14:41:44 GMT

#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.

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Thu, 21 Jan 2021 14:28:58 GMT

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

RE: writing and reading from I2c eeprom ?

awneil — Wed, 20 Jan 2021 14:44:10 GMT

[quote userid="91908" url="~/f/nordic-q-a/70497/writing-and-reading-from-i2c-eeprom/290276#290276"]Is it conflict[/quote]

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.

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Wed, 20 Jan 2021 13:46:21 GMT

TWI scanner result :

I can not see 24C16 address

Is it conflict between my LCD and 24C16 ?

RE: writing and reading from I2c eeprom ?

Vidar Berg — Wed, 20 Jan 2021 11:00:59 GMT

The error code corresponds to NRF_ERROR_DRV_TWI_ERR_ANACK, which indicates that it received a NACK when it tried to address the sensor. There can be several reasons for this to happen. You should probably verify the communcation with the TWI scanner example first, as Awneil suggested.

RE: writing and reading from I2c eeprom ?

awneil — Tue, 19 Jan 2021 15:31:46 GMT

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Tue, 19 Jan 2021 14:53:41 GMT

I got

nfo> app: Error code 33281

what's the meaning ?

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Tue, 19 Jan 2021 14:51:40 GMT

from this code,

err_code = eeprom_write(addr, &clear_val, 1);
if (NRF_SUCCESS != err_code)
{
NRF_LOG_INFO("communication error 24C16.\r\n");

return;
}

how can I print out err_code ?

NRF_LOG_INFO("%u",err_code); ?

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 23:57:58 GMT

I reckon, I have insufficient power for this 24C16 PU27, I will try with external 3.3V, I keep posted, thanks

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 22:50:12 GMT

Ok, I'll see with analyzer and posted, thanks

RE: writing and reading from I2c eeprom ?

awneil — Mon, 18 Jan 2021 15:26:32 GMT

Have you used an oscilloscope or analyser to see what's happening on the wires?

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 15:07:44 GMT

still can not see 24C16 address on TWI scanner, is my supply to low ? I checked, VCC=2.4V ?

RE: writing and reading from I2c eeprom ?

awneil — Mon, 18 Jan 2021 14:43:08 GMT

You need pullups somewhere on the I2C bus - this is a basic requirement for any I2C bus.

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 14:30:11 GMT

How can I remove " escape sequences" ? thanks

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 14:14:52 GMT

do i need pull up resistor on SCL and SDA on 24C16 ? thanks

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 14:06:43 GMT

on TWI scanner, I can not find 0xA0, which is 24C16, what do I miss ?

nfo> app: TWI scanner started.


nfo> app: TWI device detected at address 0x3C.


nfo> app: TWI device detected at address 0x50.


nfo> app: TWI device detected at address 0x51.


nfo> app: TWI device detected at address 0x52.


nfo> app: TWI device detected at address 0x53.


nfo> app: TWI device detected at address 0x54.


nfo> app: TWI device detected at address 0x55.


nfo> app: TWI device detected at address 0x56.


nfo> app: TWI device detected at address 0x57.

RE: writing and reading from I2c eeprom ?

awneil — Mon, 18 Jan 2021 12:58:59 GMT

Is that what you're actually seeing on your terminal?

You need to remove the escape sequences to make that legible.

[quote userid="6462" url="~/f/nordic-q-a/70497/writing-and-reading-from-i2c-eeprom/289562#289562"]you should start with the TWI Scanner to verify your hardware connections, and Slave Address[/quote]

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 07:12:40 GMT

I got :

[1;37m[1;32muart_cli:~$ [1;37meeprom clear

[1;31mcommunication error

[1;37m[1;32muart_cli:~$ [1;37meeprom clear

[1;31mcommunication error

[1;37m[1;32muart_cli:~$ [1;37m

what do I miss ? I use a real 24C16 chip

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Mon, 18 Jan 2021 04:04:50 GMT

I'm using :

nRF5_SDK_17.0.2_d674dde\examples\peripheral\twi_master_with_twis_slave

Please verify me ,

#define EEPROM_SIM_SIZE (2048u) //!< 24C16 EEPROM size

or 16384 ?

//#define EEPROM_SIM_ADDR 0x50 //!< Simulated EEPROM TWI slave address.
#define EEPROM_SIM_ADDR 0xA0 //!< AT24C16 EEPROM TWI slave address.

//#define EEPROM_SIM_SCL_S         31   //!< Slave SCL pin. <====Originnaly
//#define EEPROM_SIM_SDA_S         30   //!< Slave SDA pin.

#define EEPROM_SIM_SCL_S         27   //!< Slave SCL pin.
#define EEPROM_SIM_SDA_S         26   //!< Slave SDA pin.

Do I need to define WP (write protect) of 24C16, if I don't want to protect it ?

What does it mean by :

#define EEPROM_SIM_TWIS_INST 1 //!< TWIS interface used by EEPROM simulator.

is it possible to change it to TWI0, because port I use in my board is TWI0, I don't use TWIS

Currently my board is using :

// Arduino board mappings
#define ARDUINO_SCL_PIN             27    // SCL signal pin
//#define ARDUINO_SCL_PIN             NRF_GPIO_PIN_MAP(0,27)
#define ARDUINO_SDA_PIN             26    // SDA signal pin
//#define ARDUINO_SDA_PIN             NRF_GPIO_PIN_MAP(0,26)
#define ARDUINO_AREF_PIN            2     // Aref pin

How can I adapt it ?

I saw 2 defines at

eeprom_simulator_init();

and

err_code = twi_master_init();

thanks

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Sat, 16 Jan 2021 22:03:21 GMT

Ok, thanks

RE: writing and reading from I2c eeprom ?

awneil — Sat, 16 Jan 2021 16:31:03 GMT

Have you read the descriptions? What do you think?

Anyhow, you should start with the TWI Scanner to verify your hardware connections, and Slave Address

RE: writing and reading from I2c eeprom ?

RixtronixLAB — Sat, 16 Jan 2021 15:03:12 GMT

There are 4 TWI examples

which one is the closest application with I2C EEPROM ?

This one

nRF5_SDK_17.0.2_d674dde\examples\peripheral\twi_master_with_twis_slave\pca10056\blank\arm5_no_packs ?

thanks

RE: writing and reading from I2c eeprom ?

awneil — Fri, 15 Jan 2021 09:31:47 GMT

An I2C EEPROM neither knows nor cares what microcontroller you use; all it sees is the transactions on the I2C bus - Start Conditions, Addressing, Stop Conditions; ACK/NAK, etc.

The Nordic SDK examples show you how to use the I2C (aka "TWI") hardware in the nRF52 - ie how to address a Slave, Read, and Write.

So you use the basic functions, together with the datasheet of your EEPROM, to generate the I2C transactions that the EEPROM requires.

For examples, see:

https://devzone.nordicsemi.com/f/nordic-q-a/70466/nrf52832-with-mpu9250-using-i2c-twi-on-sdk15-2-sd132-segger-embedded-studio/289159#289159