twi_master_with_twis_slave - incorrect EEPROM data

RE: twi_master_with_twis_slave - incorrect EEPROM data

Susheel Nuguru — Tue, 08 Aug 2017 19:05:58 GMT

Arun, it would be helpful if you have a logic analyzer or similar to probe the TWI pins and listen to its traffic. It will tell you quite clearly why the eeprom is not responding. I am guessing that your EEPROM is nacking every command send from the TWI master due to wrong configuration.

RE: twi_master_with_twis_slave - incorrect EEPROM data

Jakub Rzeszutko — Tue, 08 Aug 2017 13:09:29 GMT

you need to also remove "case x" - it uses simulated eeprom. And you also have to remove:

   if(eeprom_simulator_error_check())
    {
        printf(
                "WARNING: EEPROM transmission error detected.\n"
                "Use 'x' command to read error word.\n\r"
        );
        UNUSED_VARIABLE(fflush(stdout));
    }

RE: twi_master_with_twis_slave - incorrect EEPROM data

Jakub Rzeszutko — Tue, 08 Aug 2017 12:56:23 GMT

Minimum what you shall do is to remove:

/* Initializing simulated EEPROM */
err_code = eeprom_simulator_init();
APP_ERROR_CHECK(err_code);

You also can remove:

#include "eeprom_simulator.h"

Unfortunately I don't have possibility to check this today but it is quite likely it will work.

RE: twi_master_with_twis_slave - incorrect EEPROM data

Arun — Tue, 08 Aug 2017 12:48:51 GMT

I am using nRF5_SDK_11.0.0_89a8197.

RE: twi_master_with_twis_slave - incorrect EEPROM data

Jakub Rzeszutko — Tue, 08 Aug 2017 12:41:32 GMT

In which SDK version you would like to modify the example?

RE: twi_master_with_twis_slave - incorrect EEPROM data

Arun — Tue, 08 Aug 2017 12:22:53 GMT

I have NRF_SUCCESS in all transactions. My eprom device memory can hold 256 Byte data.I am looking at simulator eeprom simulated example from the sdk. what changes do i need to make in the file to read data from the eeprom device. Thanks

RE: twi_master_with_twis_slave - incorrect EEPROM data

Jakub Rzeszutko — Tue, 08 Aug 2017 11:45:56 GMT

does "ret" provide any error indication or you have NRF_SUCCESS during read and write operation?

RE: twi_master_with_twis_slave - incorrect EEPROM data

Arun — Tue, 08 Aug 2017 10:12:46 GMT

I also programmed the same EEPROM device with an arduino to write data and tried reading the data with nrf52,but i am reading incorrect data.

RE: twi_master_with_twis_slave - incorrect EEPROM data

Arun — Tue, 08 Aug 2017 10:09:03 GMT

Thanks for the response.I have communication with the EEPROM device. But the problem is I cannot read and write.

RE: twi_master_with_twis_slave - incorrect EEPROM data

Jakub Rzeszutko — Tue, 08 Aug 2017 10:04:37 GMT

Hi,

If I see in your screens correctly you are using SDK11. Do you have any communication with EEPROM? You can try TWI Scanner example to check if connection is fine. But it is available in newer SDK: SDK12/SDK13/SDK14 (\sdk\nrf5\examples\peripheral\twi_scanner)