RE: GPIOTE polling

FormerMember — Wed, 11 Jul 2018 09:10:20 GMT
The attached code shows how to use GPIOTE to detect toggle on the input pin and then toggle the output pin.
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/** @file
*
* @defgroup gpiote_example_main main.c
* @{
* @ingroup nrf_gpiote_example
* @brief GPIOTE Example Application main file.
*
* This file contains the source code for a sample application using GPIOTE.
*/

#include <stdbool.h>
#include <stdint.h>
#include "nrf.h"
#include "nrf_gpiote.h"
#include "nrf_gpio.h"
#include "boards.h"
#include "nrf_drv_ppi.h"
#include "nrf_drv_timer.h"
#include "nrf_drv_gpiote.h"
#include "app_error.h"

#ifdef BSP_LED_0
    #define GPIO_OUTPUT_PIN_NUMBER BSP_LED_0  /**< Pin number for output. */
#endif
#ifndef GPIO_OUTPUT_PIN_NUMBER
    #error "Please indicate output pin"
#endif

#define GPIO_INPUT_PIN_NUMBER   BSP_BUTTON_0

static void button_push_test(void)
{
	uint32_t gpiote_event_addr;
	uint32_t gpiote_task_addr;
	ret_code_t err_code;

	
	nrf_ppi_channel_t ppi_channel;
	
	// Configure input
	nrf_gpio_cfg_input(GPIO_INPUT_PIN_NUMBER, NRF_GPIO_PIN_NOPULL);
	
	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(GPIO_INPUT_PIN_NUMBER,&in_config, NULL); 
	APP_ERROR_CHECK(err_code);
	
	gpiote_event_addr = nrf_drv_gpiote_in_event_addr_get(GPIO_INPUT_PIN_NUMBER);
	
	
	// Configure output
	
	nrf_gpio_cfg_output(GPIO_OUTPUT_PIN_NUMBER);
	
	nrf_drv_gpiote_out_config_t out_config = GPIOTE_CONFIG_OUT_TASK_TOGGLE(false);
	
	err_code = nrf_drv_gpiote_out_init(GPIO_OUTPUT_PIN_NUMBER, &out_config);
  APP_ERROR_CHECK(err_code);
	
	gpiote_task_addr = nrf_drv_gpiote_out_task_addr_get(GPIO_OUTPUT_PIN_NUMBER);

	
	// Set up PPI channel
	err_code = nrf_drv_ppi_channel_alloc(&ppi_channel);
  APP_ERROR_CHECK(err_code);
	
	
	err_code = nrf_drv_ppi_channel_assign(ppi_channel, gpiote_event_addr, gpiote_task_addr);
  APP_ERROR_CHECK(err_code);
	
  err_code = nrf_drv_ppi_channel_enable(ppi_channel);
  APP_ERROR_CHECK(err_code);
	
	// Enable GPIOTE
	nrf_drv_gpiote_in_event_enable(GPIO_INPUT_PIN_NUMBER,false);
  nrf_drv_gpiote_out_task_enable(GPIO_OUTPUT_PIN_NUMBER);
	
	
}

/**
 * @brief Function for application main entry.
 */
int main(void)
{
    ret_code_t err_code;

    err_code = nrf_drv_ppi_init();
    APP_ERROR_CHECK(err_code);

    err_code = nrf_drv_gpiote_init();
    APP_ERROR_CHECK(err_code);
	
		button_push_test();

    while (true)
    {
        // Do Nothing - GPIO can be toggled without software intervention.
    }
}


/** @} */