Waveshare NRF52840 - Chapter 4. Controling LED; Codes

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NRF52840 Eval Kit User Manual

Vision: V1.0.1 Date: 2019.01.19 20 / 72

CHAPTER 4. CONTROLING LED

In this chapter, we will instruct how to configure GPIO and control LED. The

examples used herein is 001_LED.

CODES

Open led.h files, you can find that the GPIO and related control functions are defined

in this header file:

#ifndef __LED_H__

#define __LED_H__

#include "nrf.h"

#include "nrf_gpio.h"

#define LED0 NRF_GPIO_PIN_MAP(0,13)

#define LED1 NRF_GPIO_PIN_MAP(0,14)

#define LED2 NRF_GPIO_PIN_MAP(0,19)

#define LED3 NRF_GPIO_PIN_MAP(0,16)

void LED_On(uint32_t led_number);

void LED_Off(uint32_t led_number);

#endif

Functions defined in header file will be realized in led.c file:

#include "led.h"

void LED_On(uint32_t led_number)

{

nrf_gpio_cfg_output(led_number);

nrf_gpio_pin_clear(led_number);

}

void LED_Off(uint32_t led_number)

{

nrf_gpio_cfg_output(led_number);

nrf_gpio_pin_set(led_number);

}

LED_On(led_number): Turn the LED on

LED_Off(led_number): Turn the LED off