串口发送一段时间后停止发送

发布于 2021-09-17 15:56:37 浏览：1538 订阅该版

大家好！想请教一下：我写了一个传感器采集数据，并打印和通过串口发送一串报文驱动数码管显示内容。采集的数据放在一个数组中。在测试中发现串口发送一段时间后就不再发送数据。想请教一下这是什么环节出现了问题。
1、传感器采集数据的程序
```
#include <SHT85.h>
#include <rtthread.h>
#include <rtdevice.h>
#include <board.h>

#include "sht3x.h"
#include <Usart.h>
#include <stdio.h>

#define SHT85_I2C_BUS_NAME        "i2c1"
#define SHT85_ADDR                 0x44

#define THREAD_PRIORITY         25
#define THREAD_STACK_SIZE       1024
#define THREAD_TIMESLICE        5

static rt_thread_t Sht85_Thread = RT_NULL;
static rt_thread_t Sht85_Print_Thread = RT_NULL;
static rt_sem_t Sht85_sem = RT_NULL;

float humidity = 0;

void SHT85_Init(void)
{
    Sht85_sem = rt_sem_create("SHT85_sem", 0, RT_IPC_FLAG_FIFO);

//i2c1采集线程初始化 //
    Sht85_Thread = rt_thread_create("SHT85_Get", SHT85_Thread_entry, RT_NULL, THREAD_STACK_SIZE, THREAD_PRIORITY, THREAD_TIMESLICE);
    if(Sht85_Thread!=RT_NULL)
    {
        rt_thread_startup(Sht85_Thread);
    }
    else {
        rt_kprintf("sht85 thread create failed\n");
    }

Sht85_Print_Thread = rt_thread_create("SHT85_Print",SHT85_Print_Thread_entry,RT_NULL,THREAD_STACK_SIZE,THREAD_PRIORITY-1,THREAD_TIMESLICE);
    if(Sht85_Print_Thread!=RT_NULL)
    {
        rt_thread_startup(Sht85_Print_Thread);
    }
}

static void SHT85_Thread_entry(void* parameter)
{
    sht3x_device_t sht85_device;
    sht85_device = sht3x_init(SHT85_I2C_BUS_NAME, SHT85_ADDR);

int i = 0;
    while(1)
    {
        if(sht3x_read_singleshot(sht85_device)==RT_EOK)
        {
            humidity = sht85_device->humidity;
            I2c1_Buffer[i++] = humidity;
            if(i==10)
            {
                rt_sem_release(Sht85_sem);
                i = 0;
            }
        }
        else {
            rt_kprintf("read sht85 fail.\r\n");
            break;
        }
        rt_thread_mdelay(200);
    }
}

static void SHT85_Print_Thread_entry(void* parameter)
{
    static rt_err_t sem_result;
    while(1)
    {
        sem_result = rt_sem_take(Sht85_sem, RT_WAITING_FOREVER);
        if(sem_result==RT_EOK)
        {
            printf("i2c1 value: %.2f\n",I2c1_Buffer[0]);
            uart6_transmit(I2c1_Buffer[0],0x02);
        }
        else {
            rt_sem_delete(Sht85_sem);
            return;
        }
        rt_thread_mdelay(2000);
    }
}

```
2、串口发送的程序
```
#include <rtthread.h>
#include <Usart.h>
#include <rtdevice.h>
#include <math.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 uart6_transmit(float x,uint8_t func)            /*x为需要显示的变量（湿度、风速等），function为显示功能参数 */                                                   //
{                                                     //0x01--温度、0x02--湿度、0x03--风速、0x04--等效温度
    rt_err_t ret = RT_EOK;
    rt_size_t send_len = 0;

uint8_t PN;                                          //正负位//
    uint8_t digits;                                      //小数点位//

Data_TypeDef num;
    num.Frame_Head = 0xAA;
    num.Length = 5;
    num.Function = func;

if(x<0)
    {
        PN = 0;
    }
    else {
        PN = 1;
    }
    if(x>=10 || (x<=-1&&x>-10))                                                //显示一位小数//
    {
        digits = 1;
        if(x>0)
        {
            x = x*10;
        }
        else {
            x = -x*10;
        }

}
    else if(x>-1 && x<10)                                                     //显示两位小数//
    {
        digits = 2;
        if(x>0)
        {
            x = x*100;
        }
        else {
            x = -x*100;
        }

}
    else if(x<=-10)                                                             //显示零位小数//
    {
        digits = 0;
        x = -x;
    }

num.Data_Nature = digits + PN*16;

num.Data_High = (int)x>>8;              //数据化为十六进制高八位//
    num.Data_Low = (int)x & (0xFF);         //数据化为十六进制低八位//

num.BBC = num.Function^num.Data_High^num.Data_Low^num.Data_Nature;
    uint8_t str[7] = {num.Frame_Head,num.Length,num.Function,num.Data_High,num.Data_Low,num.Data_Nature,num.BBC};

/* 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     = 256;                   //修改缓冲区 buff size
    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));
    if (send_len != sizeof(str))
    {
        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");
//    }
//
////    rt_kprintf("serial device test successful\r\n");

}

```
在串口调试助手捕获到这样的消息，是因为我的内存设置的原因吗？
![image.png](https://oss-club.rt-thread.org/uploads/20210917/c67d1994613bf7f0284eefc3b236f3b7.png.webp)