When using the nrf5340's iic for communication, there are non-removable delays

[Hunter_P]

We have encountered a problem in using iic to communicate that the delay cannot be removed.

We are using the sample in NCS,

the address of the sample is C:\ncs\v2.6.1\modules\hal\nordic\nrfx\samples\src\nrfx_twim_twis\txrx

Then add the code for iic communication every 10ms inside the while(1) loop.

    while (1)
    {
        NRFX_LOG_INFO("Reading value of DRONE_REG_FORCE_X register:");
        register_read(DRONE_IDX, DRONE_REG_FORCE_X, (uint8_t *)&drone_ctrl_buffer, 1);
        NRFX_LOG_INFO("ctrl buff: 0x%X", drone_ctrl_buffer);
        NRFX_LOG_INFO("...");
        drone_ctrl_buffer = 0;
        NRFX_EXAMPLE_LOG_PROCESS();
        k_msleep(10);
    }

After analyzing the iic signals through a logic analyzer, I found that it is not guaranteed to communicate once every 10ms, and that after each communication, a delay of 27ms must be required before the next communication can take place.

I would like to ask how to remove or shorten the delay between two communications.

[Håkon Alseth]

Hi,

 

You are logging in your while-loop, which will affect the timing. In addition, the register_read() function is a blocking function, so that will also add to the delayed execution, in terms of always sending every 10 ms.

Try disabling logging to see if this helps the scenario.

 

Kind regards,

Håkon