nRFX lib - Problem with interupt and timer

Question

Hi,

I use a mcu nRF52840 on a personal card for a project and we are stuck on interruptions: hardware pin and timer. I use the lib "nrfx" for future accounting purposes. I took the example code from the library "nrf" located at

*nRF5_SDK_15.3.0_59ac345\examples\peripheral\pin_change_int*

and I converted it with the nrfx library.

//-----------------------------------------CODE--------------------------------------------------------------
#include <nrfx.h>
#include <nrfx_gpiote.h>
#include "bsp.h"
#include "system_nrf52840.h"

void interuptTest(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action);

void main(void)
{
  SystemInit();
  bsp_init();
  // Configure the interupt on button 0
  nrfx_gpiote_init();
  nrfx_gpiote_in_config_t button_0_config = NRFX_GPIOTE_CONFIG_IN_SENSE_HITOLO( true );
  nrfx_err_t test = nrfx_gpiote_in_init( BUTTON_0_PIN , &button_0_config, interuptTest );
  nrfx_gpiote_in_event_enable( BUTTON_0_PIN , true );

  while ( true )
  {
    // Make sure that the button is detected
    if( nrfx_gpiote_in_is_set( BUTTON_0_PIN ) )
    {
      nrfx_gpiote_out_clear( LED_2_PIN );
    } else
    {
      nrfx_gpiote_out_set( LED_2_PIN );
    }
  }
}

void interuptTest(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
  nrfx_gpiote_out_toggle( LED_1_PIN );
}
//-------------------------------------------------------------------------------------------------------------------

The execution of this code does not cause any interruption, however, LED number 2 changes state when button 0 is pressed, which attests to the change in the state.

Given the problems I have with both the hardware and timer interruptions, we must have missed a step in the configuration of the mcu. Can you enlighten me on this subject? What more needs to be done to allow interruptions?

Another question: I can't find an example with the nrfx library. Is that normal? Do you have a link to "official" examples using this library?

Thank you very much!

Sigurd · Accepted Answer

Hi,

The reset_handler will call SystemInit() before jumping to main() as part of the startup, so you don't have have to call it again in main().

You should not read the pin status in the main while loop, it will consume alot of power. Use interrupts instead. This code here works fine when I test it on a DK.

//----------------------------------------------------------------------------Code---------------------------------------------------
#include <nrfx.h>
#include <nrfx_gpiote.h>
#include "bsp.h"
#include "system_nrf52840.h"
#include "boards.h"

void interuptTest( nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action );
void check_error( nrfx_err_t err_code );

void main(void)
{
  //SystemInit();
  // Configure bouton and LEDs
  // LEDs need output direction
  nrf_gpio_cfg_output( BSP_LED_0 );
  nrf_gpio_cfg_output( BSP_LED_1 );
  nrf_gpio_cfg_output( BSP_LED_2 );

  // Buttons need input direction, pull up are in hardware
  nrf_gpio_cfg_input( BSP_BUTTON_0, NRF_GPIO_PIN_PULLUP ); 
  nrf_gpio_cfg_input( BSP_BUTTON_1, NRF_GPIO_PIN_PULLUP ); 
  nrf_gpio_cfg_input( BSP_BUTTON_2, NRF_GPIO_PIN_PULLUP ); 

  // Configure the interupt on button 0
  nrfx_err_t err_code = nrfx_gpiote_init();
  check_error( err_code );
  nrfx_gpiote_in_config_t button_0_config = NRFX_GPIOTE_CONFIG_IN_SENSE_HITOLO( true );
  button_0_config.pull = NRF_GPIO_PIN_PULLUP;

  err_code = nrfx_gpiote_in_init( BSP_BUTTON_0 , &button_0_config, interuptTest );
  check_error( err_code );

  nrfx_gpiote_in_event_enable( BSP_BUTTON_0 , true );

  while ( true )
  {
      // Wait for an event.
    #ifdef SOFTDEVICE_PRESENT
        if (nrf_sdh_is_enabled())
        {
            ret_code_t ret_code = sd_app_evt_wait();
            ASSERT((ret_code == NRF_SUCCESS) || (ret_code == NRF_ERROR_SOFTDEVICE_NOT_ENABLED));
            UNUSED_VARIABLE(ret_code);
        }
        else
    #endif // SOFTDEVICE_PRESENT
    {
        // Wait for an event.
        __WFE();
        // Clear the internal event register.
        __SEV();
        __WFE();
    }


  }
}

void interuptTest(nrfx_gpiote_pin_t pin, nrf_gpiote_polarity_t action)
{
  nrfx_gpiote_out_toggle( BSP_LED_1 );
}
void check_error( nrfx_err_t err_code )
{
  if (NRFX_SUCCESS == err_code)
   {
     debug_printf("Configuration success!\r\n");
   } else 
   {
     debug_printf("Error code : %i \r\n", err_code);
   }
}
//--------------------------------------------------------------------------------------------------------------------------------------

Mikael said:
how can we include "app_error.h"?

Just add this at top of main.c

#include "app_error.h"

nRFX lib - Problem with interupt and timer

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