<内核学习营>+坦然+探索者stm32f407板子RT-thread串口字符点灯

发布于 2018-09-06 18:31:53 浏览：1626 订阅该版

* 本帖最后由 luzixing 于 2018-9-12 11:39 编辑 *

实验要求：本实验是在探索者开发板完成的
硬件：至少有两路GPIO， 能够用来接LED 灯至少有一路GPIO 作为输入端接按键
有一路串口用来做msh shell 终端

软件：
串口驱动
PIN 驱动

准备工作：由于硬件的限制，只能通过杜邦线跳到串口2（1串口的东西看不到）

实现的代码：
#include <rtthread.h>
#include <rtdevice.h>

#define BUFF_SIZE         64

#define LED_R         21
#define LED_Y   22

#define LED_ON(x)                 rt_pin_write(x ,0)
#define LED_OFF(x)                 rt_pin_write(x ,1)

static char uart_rx_buffer[BUFF_SIZE];

static rt_err_t uart_rx_ind(rt_device_t dev, rt_size_t size)
{
        static rt_uint8_t pos = 0;
        
        if(size == 1)
        {
                rt_device_read(dev, 0, &uart_rx_buffer[pos], size);
//                rt_device_write(dev, 0, &uart_rx_buffer[pos], size);
                if((pos == 0)&&(uart_rx_buffer[pos] == 'L')) pos++;
                else if((pos == 1)&&(uart_rx_buffer[pos] == 'E')) pos++;
                else if((pos == 2)&&(uart_rx_buffer[pos] == 'D')) pos++;
                else if((pos == 3)&&(uart_rx_buffer[pos] == ' ')) pos++;
                else if (pos == 4)
                {
                        if(uart_rx_buffer[pos] == 'R')
                        {
                                LED_ON(LED_R);
                                LED_OFF(LED_Y);
                        }
                        else if(uart_rx_buffer[pos] == 'Y')
                        {
                                LED_OFF(LED_R);
                                LED_ON(LED_Y);
                        }
                        pos = 0;
                }
                else pos = 0;
        }
        else
                rt_kprintf("Please set the uart to interrupt RX mode!<br>");

return RT_EOK;
}

int led_rgb(void)
{
        rt_device_t uart_device;
        
        /*LED??????????*/
        rt_pin_mode(LED_R, PIN_MODE_OUTPUT_OD);
        rt_pin_mode(LED_Y, PIN_MODE_OUTPUT_OD);
        
        /*???????LED?,???????,?????*/
        rt_pin_write(LED_R ,1);
        rt_pin_write(LED_Y ,1);

uart_device = rt_device_find("uart2");  
        rt_device_set_rx_indicate(uart_device, uart_rx_ind);
        rt_device_open(uart_device, (RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX));

return 0;
}
/* ??? msh ????? */
MSH_CMD_EXPORT(led_rgb, uart sample);

实验步骤：

一.配置led灯引脚
二.设置灯引脚为输出引脚
三.下载程序后，通过LED R、LED Y 分别点亮红灯和黄灯。

结果：
![1535676788(1).jpg](/uploads/201809/06/181517s42kx9x3l44e2llf.jpg)![1536228515(1).jpg](/uploads/201809/06/181523ci07qzqisps05si5.jpg)![微信图片_20180830192122.jpg](/uploads/201809/06/181524zejnibna4h6av4zo.jpg)![微信图片_20180830192137.jpg](/uploads/201809/06/181524uwbt2pitnewtbbnt.jpg)