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Unable to write 8210 bytes on I2C_0 bus in Zephyr RTOS

Sriharsha Desai

Hello,

I am using NCS v1.6.0 for nRF52840.

I need to write 8210 bytes to flash via I2C. I configured the I2C0 with NRFX_TWIM and NRFX_TWIM0 enabled in the prj.conf file.

I am using i2c_transfer API from Zephyr to perform I2C operations.

All other I2C transactions for reading writing registers are working. When I try to send 8210 bytes of data. I get following error

[00:00:13.442,718] <err> i2c_nrfx_twim: Error on I2C line occurred for message 1
I2C write retry = -5
 
[00:00:13.443,420] <err> i2c_nrfx_twim: Error 0x0BAE0002 occurred for message 1
 I2C write retry = -5
 
[00:00:13.443,725] <err> i2c_nrfx_twim: Error 0x0BAE0002 occurred for message 0
 I2C write retry = -5

[00:00:13.444,061] <err> i2c_nrfx_twim: Error 0x0BAE0002 occurred for message 0
I2C write retry = -5
 
 [00:00:13.444,366] <err> i2c_nrfx_twim: Error 0x0BAE0002 occurred for message 0

  • 0

    Hi

    You will need to split the number of bytes up into smaller bulks I think. Please check out the TXD.MAXCNT and AMOUNT registers in the TWIM peripheral to see the maximum amount of bytes in a single transmit buffer.

    Best regards,

    Simon

  • 0 in reply to Simonr

    Hi Simonr,

    I checked the TXD.MAXCNT registers in the TWIM. It is declared as uint32_t. 

    Can you let me know what could be the issue? Is there any configuration needs to set when using NCS 1.6.0

  • 0

    Hi

    As I don't know what your application looks like it's hard to say what you need to do. Can we start off by looking at your TWI init function, as the write retry error you're seeing is -5 points toward an I/O error, please make sure that the device you're reading data from might not be initialized properly and is ready for a transaction?

    Best regards,

    Simon

  • 0 in reply to Simonr

    Hi Simon,

    My application is to write 8208 bytes of data to a flash using I2C for 33 times. I have copied the hex values of the file in a header file of uint8_t bytes array. I read the 8k of data from the header file and copy it to a dynamically allocated buffer and transmit it over I2C. But when I transfer more than 16 bytes I get i2c error. I have copied the error below. Can you let me know how to increase the transmit buffer in zephyr rtos.

    Note: I am using NCS 1.6.0

    [00:00:07.646,026] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0
    00>
    00> [00:00:08.146,179] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0
    00>
    00> [00:00:08.646,301] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0
    00>
    00> [00:00:09.146,423] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0
    00>
    00> [00:00:09.646,575] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0
    00> [00:00:10.152,893] <err> i2c_nrfx_twim: Error on I2C line occurred for message 0

    When write more than 16 bytes of data on I2C, getting the following error. If we transmit less than 16 bytes transaction is completing without any errors.

    Thank you

  • +1

    Hi

    Can you show me your TWI functions using the i2c_nrfx_twim calls? These error messages doesn't seem to tell too much. I believe the buffer sizes are set by the CONCAT_BUF_SIZE in i2c_nrfx_twim.c in NCS v1.6.0

    Best regards,

    Simon

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