同时打开CAN与RS485的通讯，RS485无法正常通讯

发布于 2021-10-09 08:46:56 浏览：1095 订阅该版

```c
/*START RS485*/
/******************uart task*********************/
rt_thread_t thread = rt_thread_create("MsgProLoop", MsgProLoop, RT_NULL, 128*12,17, 10);
   /* 创建成功则启动线程 */
   if (thread != RT_NULL)
   {
       rt_thread_startup(thread);
   }
   else
   {
       rt_kprintf("Create SDIOCortex error!");
   }
   
	/********************************************************/
	////////////////////////////////////////////////////////
	/**************************uart receive******************/
 	rt_pin_write(44,1);
		rt_thread_mdelay(1);
        while (rt_device_read(serial, -1, &ch, 1) != 1)
        {
            /* 阻塞等待接收信号量，等到信号量后再次读取数据 */
            rt_sem_take(&rx_sem, RT_WAITING_FOREVER);
        }
		rt_thread_mdelay(1);
		rt_pin_write(44,0);
	////////////////////////////////////////////////
	 
	 /****************send uart data**************************/
        rt_pin_write(44,0);
	rt_thread_mdelay(1);
	size = rt_device_write(serial, 0, LocSpeedRemData,                 (sizeof(LocSpeedRemote_T)));
rt_thread_mdelay(1);
	rt_pin_write(44,1);

/**************send uart data end****************************/

/*END RS485*/
/*can start*/
rt_err_t res;

rt_thread_t thread;
    rt_thread_t threadtx;
    char can_name[RT_NAME_MAX];
    rt_strncpy(can_name, CAN_DEV_NAME1, RT_NAME_MAX);
    /* 查找 CAN 设备 */
    can_timeout1 = rt_timer_create("tmrcan1", cansendtimeout1, RT_NULL, 2000, RT_TIMER_FLAG_ONE_SHOT|RT_TIMER_FLAG_SOFT_TIMER);
    can_dev1 = rt_device_find(can_name);
    if (!can_dev1)
    {
        rt_kprintf("find %s failed!\n", can_name);
        return RT_ERROR;
    }

/* 初始化 CAN 接收信号量 */
    rt_sem_init(&rx_sem1, "rx_sem", 0, RT_IPC_FLAG_FIFO);

res = rt_device_control(can_dev1, RT_CAN_CMD_SET_BAUD, (void *)CAN250kBaud);
    res = rt_device_control(can_dev1, RT_CAN_CMD_SET_MODE, (void *)RT_CAN_MODE_NORMAL);
    /* 以中断接收及发送方式打开 CAN 设备 */
    res = rt_device_open(can_dev1,  RT_DEVICE_FLAG_INT_TX | RT_DEVICE_FLAG_INT_RX);
    RT_ASSERT(res == RT_EOK);
    /* 创建数据接收线程 */
    thread = rt_thread_create("can_rx1", can_rx_thread1, RT_NULL, 1024, 19, 10);
    if (thread != RT_NULL)
    {
        rt_thread_startup(thread);
    }
    else
    {
        rt_kprintf("create can_rx1 thread failed!\n");
    }

threadtx = rt_thread_create("can_tx1", can_tx_thread1, RT_NULL, 1024, 18, 10);
    if (threadtx != RT_NULL)
    {
        rt_thread_startup(threadtx);
    }
    else
    {
        rt_kprintf("create can_tx thread failed!\n");
    }

/*can end*/
```