96 lines
2.9 KiB
C
96 lines
2.9 KiB
C
/*
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* 程序清单： 这是一个串口设备使用例程
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* 例程导出了uart_sample 命令到控制终端
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* 命令调用格式： uart_sample uart2
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* 命令解释： 命令第二个参数是要使用的串口设备名称， 为空则使用默认的串口设备
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* 程序功能： 通过串口输出字符串"hello RT-Thread!" ， 然后错位输出输入的字符
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*/
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#include <rtthread.h>
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#include "test_config.h"
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#include <rtdevice.h>
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#ifdef UART_DEMO_TEST
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#define SAMPLE_UART_NAME "uart1"
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/* 用于接收消息的信号量*/
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static struct rt_semaphore rx_sem;
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static rt_device_t serial;
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/* 接收数据回调函数*/
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static rt_err_t uart_input(rt_device_t dev, rt_size_t size)
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{
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/* 串口接收到数据后产生中断， 调用此回调函数， 然后发送接收信号量*/
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rt_sem_release(&rx_sem);
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return RT_EOK;
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}
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static void serial_thread_entry(void *parameter)
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{
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char ch;
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while (1)
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{
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/* 从串口读取一个字节的数据， 没有读取到则等待接收信号量*/
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while (rt_device_read(serial, -1, &ch, 1) != 1)
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{
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/* 阻塞等待接收信号量， 等到信号量后再次读取数据*/
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rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
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}
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/* 读取到的数据通过串口错位输出*/
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ch = ch + 1;
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rt_device_write(serial, 0, &ch, 1);
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}
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}
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static int uart_sample(int argc, char *argv[])
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{
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rt_err_t ret = RT_EOK;
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char uart_name[RT_NAME_MAX];
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char str[] = "hello BK72xx!\r\n";
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struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;
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if (argc == 2)
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{
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rt_strncpy(uart_name, argv[1], RT_NAME_MAX);
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}
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else
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{
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rt_strncpy(uart_name, SAMPLE_UART_NAME , RT_NAME_MAX);
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}
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/* 查找系统中的串口设备*/
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serial = rt_device_find(uart_name);
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if (!serial) {
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rt_kprintf("find %s failed!\n", uart_name);
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return RT_ERROR;
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}
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rt_sem_init(&rx_sem, "rx_sem", 0, RT_IPC_FLAG_FIFO);
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/* 以中断接收及轮询发送模式打开串口设备*/
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rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
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/* 设置接收回调函数*/
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rt_device_set_rx_indicate(serial, uart_input);
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/* 设置配置参数 */
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config.baud_rate = BAUD_RATE_115200;
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config.data_bits = DATA_BITS_8;
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config.stop_bits = STOP_BITS_1;
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config.parity = PARITY_NONE;
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config.bufsz = 2048; /*can not change buffer size, must be 2048*/
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/* 打开设备后才可修改串口配置参数 */
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rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);
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rt_device_write(serial, 0, str, (sizeof(str) - 1));
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rt_thread_t thread = rt_thread_create("serial", serial_thread_entry , RT_NULL,1024, 25, 10);
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if (thread != RT_NULL) {
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rt_thread_startup(thread);
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}
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else {
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ret = RT_ERROR;
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}
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return ret;
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}
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/* 导出到msh 命令列表中*/
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MSH_CMD_EXPORT(uart_sample, uart device sample);
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#endif
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