使用串口传输一组数据驱动另一外设

发布于 2021-09-14 20:54:12 浏览：757 订阅该版

大家好！我想请教一下。我想通过板子上的串口6以数组的形式发送一组数据到另一个板子，驱动上面的数码管屏幕显示数据。
这个是我在keil裸机开发里写的程序，数组包含六个元素，帧头，功能，数据各位数和校验和。串口6需要修改波特率为9600.
```c
void Humi_Display(float humidity)                   //ÏÔÊ¾Êª¶Èµ½ÆÁÄ»
{
	uint8_t func=0,ten=0,units=0,digit=0;
	Data_TypeDef Data_2;
	Data_2.Frame_Head = 0xAA;
	Data_2.Function = 0x02;
	Data_2.Ten = (int)(humidity/10)%10;
	Data_2.Units = (int)(humidity/1)%10;
	Data_2.Digit = (int)(humidity*10/1)%10;
	
	func=Data_2.Function;
	ten=Data_2.Ten;
	units=Data_2.Units;
	digit=Data_2.Digit;
	Data_2.BBC = func^ten^units^digit;
	
	uint8_t Message[6]={Data_2.Frame_Head,Data_2.Function,Data_2.Ten,Data_2.Units,Data_2.Digit,Data_2.BBC};
	HAL_UART_Transmit(&huart6,Message,sizeof(Message),0xFFFF);
```

下面是我在rt-thread 中的代码
```c
#include <rtthread.h>
#include <Usart.h>
#include <rtdevice.h>

#define UART_NAME       "uart6"       /* 需要操作的设备 */
static rt_device_t serial;                   /* 设备句柄 */
struct serial_configure config = RT_SERIAL_CONFIG_DEFAULT;

void uart_sample(float x)
{
    uint8_t func = 0x02;
    uint8_t ten = (int)(x/10)%10;
    uint8_t units = (int)(x/1)%10;
    uint8_t digit = (int)(x*10/1)%10;

rt_err_t ret = RT_EOK;
    rt_size_t send_len = 0;

uint8_t str[6] = {0xAA,func,ten,units,digit,func^ten^units^digit};

/* 查找系统中的串口设备 */
    serial = rt_device_find(UART_NAME);
    if (!serial)
    {
        rt_kprintf("find %s failed!\n",UART_NAME);
    }

/*配置参数*/
    config.baud_rate = BAUD_RATE_9600;        //修改波特率为 9600
    config.data_bits = DATA_BITS_8;           //数据位 8
    config.stop_bits = STOP_BITS_1;           //停止位 1
    config.bufsz     = 128;                   //修改缓冲区 buff size 为 128
    config.parity    = PARITY_NONE;           //无奇偶校验位

rt_device_control(serial, RT_DEVICE_CTRL_CONFIG, &config);

/* 以中断接收及轮询发送模式打开串口设备 */
    ret = rt_device_open(serial, RT_DEVICE_FLAG_INT_RX);
    if (ret != RT_EOK)
    {
        rt_kprintf("open device failed\r\n");
    }
    /* 发送字符串 */
    send_len = rt_device_write(serial, 0, str, (sizeof(str) - 1));
    if (send_len != sizeof(str) - 1)
    {
        rt_kprintf("send data failed\r\n");
    }
/*     关闭设备
    ret = rt_device_close(serial);
    if (ret != RT_EOK)
    {
        rt_kprintf("close device failed\r\n");
        return -RT_ERROR;
    }

rt_kprintf("serial device test successful\r\n");*/

}
```
代码编译没有问题，但是下载后数码管没有显示数字（已通电）。可以麻烦帮我看一下哪里出了纰漏吗，谢谢！