nrf_drv_timer_init NRFX_ERROR_INVALID_STATE

[dragilla]

Hi, 

I have a weird problem. My application starts two timers, one after another. Like this:

		uint32_t err_code;

    nrf_drv_timer_config_t timer_cfg = NRF_DRV_TIMER_DEFAULT_CONFIG;
		timer_cfg.frequency = NRF_TIMER_FREQ_31250Hz;
		timer_cfg.bit_width = NRF_TIMER_BIT_WIDTH_32;
		timer_cfg.mode = NRF_TIMER_MODE_TIMER;
	
    err_code = nrf_drv_timer_init(&TRIAC_TIMER, &timer_cfg, TRIAC_TIMER_event_handler);
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_timer_init(&LED_TIMER, &timer_cfg, LED_TIMER_event_handler);
    APP_ERROR_CHECK(err_code);

Normally it just works - no errors, nothing. However, after a DFU OTA upgrade (using NRF Tools), the application raises the NRFX_ERROR_INVALID_STATE error in the second nrf_drv_timer_init call. Theoretically it should be no problem, it's just already initialized, but when I just comment out the APP_ERROR_CHECK, the timer doesn't work. I use it for handling led blinking and the leds just don't blink. 

The weird part is - when I power down my device and power it back up, it works. The NRFX_ERROR_INVALID_STATE error is gone. Everthign is fine. 

I have no idea as why this would happen. Can you please help me understand?

PS: I ues the buttonless DFU bootloader. Maybe there is some sort of conflict, just after the ROM update. I just want my app to be up and running after the update. I don't want to power cycle it :/

Please advise.

[dragilla]

UPDATE: The timers are defined as follows (both enabled in sdk_config:

const nrf_drv_timer_t TRIAC_TIMER = NRF_DRV_TIMER_INSTANCE(1);
const nrf_drv_timer_t LED_TIMER = NRF_DRV_TIMER_INSTANCE(3);

When I changed the LED_TIMER to 4 - it didn't help. Changing it to 2 - solved the problem. Still no clue why...

[Kenneth]

Are you sure you have set TIMER4_ENABLED 1 in sdk_config.h? If it's due to NRFX_DRV_STATE_UNINITIALIZED, then I get a feeling that 

Are you able to find where exactly in nrf_drv_timer_init() the NRFX_ERROR_INVALID_STATE is returned?

Kenneth

[dragilla]

Yes, I'm sure it's enabled. It won't compile otherwise, right?

Can't really check exactly where it fails. If i run the debug session, it's not the "first run after OTA update" and it just works :/

All I know is the debug information in the RTT console (error code and line# in main)

[Kenneth]

It should be possible to set for instance a breakpoint in nrfx_timer_init() to find if it's failing in the following if statement or not:

    if (p_cb->state != NRFX_DRV_STATE_UNINITIALIZED)
    {
        err_code = NRFX_ERROR_INVALID_STATE;
        NRFX_LOG_WARNING("Function: %s, error code: %s.",
                         __func__,
                         NRFX_LOG_ERROR_STRING_GET(err_code));
        return err_code;
    }

[dragilla]

I will try to emaulate this somehow, hoever as I said, It only happens just after the update. The time I run it, it just works.