When EVENTS_ERROR become True ?

[Sagisawa Yukichi]

Hi. I have troubles. I'm using nRF52 DK and V0.9.0. I'm making program that does TWI communication between MPU9250 what is 9-axis sensor. error is false every time. When it become True? Please help me!

static bool twi_action_wait(nrf_drv_twi_t const * const p_instance)
{
    bool     *error*;
    bool     done;
    uint32_t timeout = 0;
    volatile transfer_t * p_transfer = &(m_cb[p_instance->instance_id].transfer);

    do
    {
        done  = nrf_twi_event_check(p_instance->p_reg, p_transfer->end_event);
        *error* = nrf_twi_event_check(p_instance->p_reg, NRF_TWI_EVENTS_ERROR);
        *error* |= (++timeout < BUSY_LOOP_TIMEOUT) ? false : true;
    } while (!(*error* | done));
    return !*error*;
}

//Question Update at 2/29. It's my program.******************** TWI_main.c

//Question Update at 3/8. It's MPU9150 program.******************** main.c

[MartinBL]

To me it looks like you haven't initialized the TWI module. Yes, you have made a TWI instance, but you have neither configured the TWI nor enabled it. Also it seems like you have a lot of redundant code. I suggest you have a close look at the TWI driver documentation on the infocenter, the TWI master examples in the SDK, and maybe the MPU examples here.

[Sagisawa Yukichi]

Thank you! I will read it and practice use the sensor. Best Regards.

[Sagisawa Yukichi]

I saw your example. But I couldn't be worked this program well. Run the program, went twi_transfer of nrf_drv_twi.c. After went through it,went assert_nrf_callback of nrf_assert.c. What is wrong with my way? The program what rewrote by me upload. I use MPU9150 & nrf52DK. Please help me.

[MartinBL]

Are you able to debug and step through your code to pinpoint exactly which line causes your code to assert? Are you still using SDK 0.9.0? Which of the MPU examples are you using?

[Sagisawa Yukichi]

Thank you your comment. I could debug and step, mpu_init() of main.c which cause to assert.

Yes. I tried to update SDK, but I can't know how to update. I used MPU example here.