Issues with gpiote interrupt

[dkj047]

void gpiote_event_handler(nrf_drv_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
    spi_read();
}

static void DRDY_interrupt_init(void)
{
    ret_code_t err_code;
//    NVIC_EnableIRQ(GPIOTE_IRQn);
    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);
    if (!nrf_drv_gpiote_is_init())
    {
      nrf_drv_gpiote_init();
    }
    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_HITOLO(false);
//    nrf_drv_gpiote_in_config_t in_config = GPIOTE_CONFIG_IN_SENSE_TOGGLE(true);
    in_config.pull = NRF_GPIO_PIN_PULLUP;
    err_code = nrf_drv_gpiote_in_init(DRDY_PIN, &in_config, gpiote_event_handler);
    APP_ERROR_CHECK(err_code);
    
    nrf_drv_gpiote_in_event_enable(DRDY_PIN, true);
}

Hi we are having issues with gpiote interrupt. We would like to do some spi read when drdy gpio becomes high to low. I have done above configuration for the same. 

We are using following set up

Segger Embedded studio. nRF5_SDK_15.2.0_9412b96  pca10056 soft device enabled, gpiote enabled. The project is based on ble_app_att_mtu_throughput example

Issues: when following code is executed 

nrf_drv_gpiote_in_event_enable(DRDY_PIN, true);

the code get stuck in dummy handler in ses_startup_nrf52840.s.

What could be the issue for this?? 

We are not using any timer module for now but we might use this in future. So also  wanted  to know do we need to set different priority for gpiote interrupt and timer interrupt or is it not required. 

How many gpiote channel can be used at once?

Please see what we have configured and let us know what went wrong.

Thanks

[Vidar Berg]

Hi,

Please try to read out the current ISR number from xpsr register when the program has ended up inside the Dummy handler. This will tell us what the interrupt source is. I included the screenshot below to illustrate what I mean. In this case, the IRQ number is 17, which if you look up in the nrf52840.h corresponds to RTC1_IRQn.  

We are not using any timer module for now but we might use this in future. So also  wanted  to know do we need to set different priority for gpiote interrupt and timer interrupt or is it not required. 

You can use the same priority for both. It is probably safer too. Note that all SDK modules use priority '6' by default. 

How many gpiote channel can be used at once?

 It has 8 channels. So 8 channels.

[dkj047]

IRQ no. INTISR[6]

[Vidar Berg]

IRQ #6 belongs to the GPIOTE so it looks like the GPIOTE handler has not been defined. Is 'GPIOTE_ENABLED' enabled in sdk_config.h and does nrfx_gpiote.c::nrfx_gpiote_irq_handler() appear greyed out in SES?

[dkj047]

In sdk_config.h GPIOTE_ENABLED is set 1 but the grey line appearing in above image is not shown for me. It is not stopping in nrfx_gpiote_irq_handler() when i try to pause code in debug mode.

[Vidar Berg]

I meant to ask if the nrfx_gpiote_irq_handler() implementation was greyed out. Anyway, I added your code to the original throughput example in SDK 15.2.0 and it worked for me with the default sdk_config settings. Could you try to compare the project against yours?

Example including the gpiote code you posted:

ble_app_att_mtu_throughput.zip

[dkj047]

Yes it worked for me too with original ble_app_mtu_throughput example. There might be some issues with my code although by comparing i am not able to figure out what was the issue. For now I will continue with my work but when i'll have time, I'll update what was the issue with my original code. 

Thanks Vidar for time and patience.