led_blink_sample.c

/* * Copyright (c) 2006-2018, RT-Thread Development Team * * SPDX-License-Identifier: Apache-2.0 * * Change Logs: * Date Author Notes * 2018-09-25 misonyo first edition. *//* * 程序清单：这是一个通过PIN脚控制LED亮灭的使用例程 * 例程导出了 led_sample 命令到控制终端 * 命令调用格式：led_sample 41 * 命令解释：命令第二个参数是要使用的PIN脚编号，为空则使用例程默认的引脚编号。 * 程序功能：程序创建一个led线程，线程每隔1000ms改变PIN脚状态，达到控制led灯 * 亮灭的效果。*/#include <rtthread.h>#include <rtdevice.h>#include <stdlib.h>/* PIN脚编号，查看驱动文件drv_gpio.c确定 */#define LED_PIN_NUM 41static int pin_num;static void led_entry(void *parameter){ int count = 0; /* 设置PIN脚模式为输出 */ rt_pin_mode(pin_num, PIN_MODE_OUTPUT); while (1) { count++; rt_kprintf("thread run count : %d\r\n", count); /* 拉低PIN脚 */ rt_pin_write(pin_num, PIN_LOW); rt_kprintf("led on!\r\n"); /* 延时1000ms */ rt_thread_mdelay(1000); /* 拉高PIN脚 */ rt_pin_write(pin_num, PIN_HIGH); rt_kprintf("led off!\r\n"); rt_thread_mdelay(1000); }}static int led_sample(int argc, char *argv[]){ rt_thread_t tid; rt_err_t ret = RT_EOK; /* 判断命令行参数是否给定了PIN脚编号 */ if (argc == 2) { pin_num = atoi(argv[1]); } else { pin_num = LED_PIN_NUM; } tid = rt_thread_create("led", led_entry, RT_NULL, 512, RT_THREAD_PRIORITY_MAX / 3, 20); if (tid != RT_NULL) { rt_thread_startup(tid); } else { ret = RT_ERROR; } return ret;}/* 导出到 msh 命令列表中 */MSH_CMD_EXPORT(led_sample, led sample);