串口3接收数据超过28个字符出现HardFault

发布于 2019-07-16 14:06:30 浏览：1226 订阅该版

串口3和电脑连接，用调试工具输入字符串接收后打印输出，当输入字符超过28个时出现hardfault，怎么回事？
源码：

static void sensor_thread_entry(void* parameter)
{
	rt_device_t myuart3;
	//char str[] = "this is my uart3 test <br>";
	char str[] = "<br>";
	char ch;
	rt_uint8_t i;

myuart3 = rt_device_find(myuart3_DEVICE_NAME);
	if(!myuart3)
	{
		rt_kprintf("find %s failed!<br>", myuart3_DEVICE_NAME);
	}
	rt_kprintf("find %s OK!<br>", myuart3_DEVICE_NAME);
	
	/*串口设备打开方式：中断接收*/
	rt_device_open(myuart3, RT_DEVICE_FLAG_INT_RX);
	
	/*创建一个信号量*/
	rt_sem_init(&rx_sem_uart3, "rx_sem_uart3", 0, RT_IPC_FLAG_FIFO);

/* 接收回调函数 */
	rt_device_set_rx_indicate(myuart3, uart_input3);

while (1)
	{

/* 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 */
        while (rt_device_read(myuart3, -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_uart3, RT_WAITING_FOREVER);
        }
        /* 读取到的数据通过串口输出 */

str[i++] = ch;
		if(ch == 0x0d)
		{
			str[i++] = 0x0a;
			rt_device_write(myuart3, 0, str, i);
			i = 0;
		}
		
		/*发送测试字符串*/
		//rt_device_write(myuart3, 0, str, 24);
		
		rt_thread_delay(10); 
	}
}

PCa5f0定位如下图
![捕获.PNG](/uploads/201907/16/140042jjllfya6yal55snz.png)
![捕获.PNG](/uploads/201907/16/140557e12pbub4nq8lllbl.png)