Create Project

Create New Project - Simple LED Blink and Print Serial Message

Let's create a new custom project.

1. Create Folder and Files

Let's create project named "mySooniLED" at C:\ncs\workspace\mySooniLED

You need 3 files for your first project.

mySooniLED\ (project folder)
1. src\main.c
2. CMakeLists.txt
3. prj.conf

So, It should look like this.

2. Source Codes

This is a simple led blink example codes.

2.1 src/main.c

We get gpio device and control directly instead of alias name such as led-0

src/main.c

#include <zephyr.h>
#include <zephyr/types.h>
#include <sys/printk.h>

#include <device.h>
#include <devicetree.h>
#include <drivers/gpio.h>

#include <stdint.h>
#include <stdbool.h>

#define LED_HEAD_PIN    7
#define LED_RESET_PIN   6
#define LED_BOOT_PIN    5

void main(void)
{    
    struct device *dev;
    int ret;
    int count = 0;

    printk("mySooniLED start\n");
    
    // get gpio0 device
    dev = device_get_binding("GPIO_0");
    if(dev == NULL)
    {
        printk("device_get_binding:error, GPIO_0\n");
        return;
    }    
    printk("device_get_binding:ok, GPIO_0\n");
    
    // config led pin
    ret = gpio_pin_configure(dev, LED_HEAD_PIN, GPIO_OUTPUT_HIGH);
    if(ret != 0)
    {
        printk("gpio_pin_configure:error, %d\n", ret);
        return;
    }

    ret = gpio_pin_configure(dev, LED_RESET_PIN, GPIO_OUTPUT_HIGH);
    if(ret != 0)
    {
        printk("gpio_pin_configure:error, %d\n", ret);
        return;
    }
    ret = gpio_pin_configure(dev, LED_BOOT_PIN, GPIO_OUTPUT_HIGH);
    if(ret != 0)
    {
        printk("gpio_pin_configure:error, %d\n", ret);
        return;
    }

    printk("gpio_pin_configure:ok\n");

    // blink and printk
    while(true)
    {                
        count++;
        printk("count=%d, time=%u\n", count, k_uptime_get_32());

        gpio_pin_set_raw(dev, LED_HEAD_PIN, 0); // turn on
        gpio_pin_set_raw(dev, LED_RESET_PIN, 1); // turn off
        gpio_pin_set_raw(dev, LED_BOOT_PIN, 1); // turn off
        k_msleep(200);
        
        gpio_pin_set_raw(dev, LED_HEAD_PIN, 1); // turn off
        gpio_pin_set_raw(dev, LED_RESET_PIN, 0); // turn on
        gpio_pin_set_raw(dev, LED_BOOT_PIN, 1); // turn off
        k_msleep(200);

        gpio_pin_set_raw(dev, LED_HEAD_PIN, 1); // turn off
        gpio_pin_set_raw(dev, LED_RESET_PIN, 1); // turn off
        gpio_pin_set_raw(dev, LED_BOOT_PIN, 0); // turn on
        k_msleep(200);
    }
}

2.2 CMakeLists.txt

CMakeLists.txt

#
# Copyright (c) 2020 Nordic Semiconductor
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

cmake_minimum_required(VERSION 3.13.1)

find_package(Zephyr REQUIRED HINTS $ENV{ZEPHYR_BASE})
project(mySooniLED)

# SOURCE FILES
target_sources(app PRIVATE src/main.c)

2.3 prj.conf

prj.conf

#
# Copyright (c) 2020 Nordic Semiconductor ASA
#
# SPDX-License-Identifier: LicenseRef-Nordic-5-Clause
#

# General config
CONFIG_NEWLIB_LIBC=y
CONFIG_HW_STACK_PROTECTION=y
CONFIG_SERIAL=y

# GPIO
CONFIG_GPIO=y

# Heap and stacks
CONFIG_HEAP_MEM_POOL_SIZE=2048
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SYSTEM_WORKQUEUE_STACK_SIZE=2048

3. Open as Segger Project

3.1 Open Segger IDE

3.2 File->Open nRF Connect SDK Project...

3.3 Select Project and Board

Select "C:\ncs\workspace\mySooniLED" project folder by use "..." button.
Check '3rd party kits'.
Select 'soonisys_sldev_nrf9160ns'.
OK.

3.4 Build and Run

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