Proggram GPIOTE using registers

Question

Hi everyone,

I'm learning about proggram the nRF52840 dongle and I tried to code an interruption. Press the SW2 to turn on a LED

#include "boards.h"
#include "nrf_delay.h"
#include <stdbool.h>
#include <stdint.h>

#define MODE 0
#define PSEL 8
#define PORT 13
#define POLARITY 16
#define OUTINIT 20

int main(void) {

  //PIN SETTINGS
  //Boton
  NRF_P1->PIN_CNF[6] = (0x00 << 0x00) | (0x01 << 0x02) | (0x00 << 0x08) | (0x02 << 0x16);
  
  //LED
  NRF_P0->PIN_CNF[8] = (0x01 << 0x00);

  //BOTON config
  NRF_GPIOTE->CONFIG[0] = (0x01 << MODE) | (0x02 << PSEL) | (0x00 << PORT) | (0x01 << POLARITY);
  
  //LED config
  NRF_GPIOTE->CONFIG[1] = (0x03 << MODE) | (0x08 << PSEL) | (0x00 << PORT) | (0x00 << POLARITY) | (0x01 << OUTINIT);
 
  //Enable Tasks & Events
  NRF_GPIOTE->INTENSET = (0x01 << 0x00) | (0x01 << 0x01);
  
  //RESET EVENTS
  NRF_GPIOTE->EVENTS_IN[0] = 0;  

  NRF_P0->OUT = (0x01 << 0x08);

  //CODE

  while (true) {
    if (NRF_GPIOTE->EVENTS_IN[0] != 0) {
      NRF_GPIOTE->TASKS_SET[1];
    } else {
      NRF_GPIOTE->TASKS_CLR[1];
    }
  }
}

So, looking at this code, where did I fail?

Thanks for helping and best regards.

Simon · Accepted Answer

I have looked at your code and managed to get it work with the following changes Skipped the code for setting the LED as output, it will be taken care of during the GPIOTE configuration Did not set the SENSE field (However, you used a value 0x16, which is 22 in decimal, and will not set the SENSE field) When configuring button 1 I used port 0 instead of port 1 No point of running NRF_P0->OUT = (0x01 << 0x08), since the value assigned to OUTINIT will overwite it Better to use BUTTON_1 and LED_1, if using pca10059 examples it will be defined to appropriate pins to work with the nRF52840 dongle When configuring button 1 through PIN_CNF I used pulldown instead of pullup Added NRF_GPIOTE->EVENTS_IN[0] = 0; in if condition Changed TASK_SET[1] to TASKS_OUT[1] = 1 Changed polarity from 0 to 3 when configuring the LED as a GPIOTE event If these bulletpoints are too messy, take a look at the code: GPIOTE_DONGLE.zip For the nRF52840 use the example in pca10059/mbr, and the hex file is located in pca10059/mbr/Output/Release/Exe However I would advice you to use PPI , which will connect tasks to events and you can make peripherals interact with each other without using the CPU. Using a higher abstraction layer, like GPIOTE HAL will make it easier. Best regards Simon

Proggram GPIOTE using registers

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