文件系统学习 + Eric + 串口窃听器

发布于 2018-07-26 23:56:52 浏览：1664 订阅该版

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* 本帖最后由 EricYYG 于 2018-7-26 23:58 编辑 *

# 简单的串口打印输出

```
rt_thread_t tid; 
tid = rt_thread_create("uart5_thread",
                uart5_thread_entry, 
                RT_NULL,
                1024, 
                12, 
                10);
if (tid != RT_NULL)
    rt_thread_startup(tid);
    
    
void uart5_thread_entry(void* parameter)
{    
        rt_uint8_t uart_tx_data[] = "hello world<br>";
        
        uart_device = rt_device_find("uart5");
        rt_device_init(uart_device);
        rt_device_open (uart_device, RT_DEVICE_OFLAG_RDWR);
        
        while (1)
        {
                rt_device_write(uart_device, 0, &uart_tx_data, strlen(uart_tx_data));
                rt_thread_delay(RT_TICK_PER_SECOND);
        }        
}
```
运行如下
![9.png](/uploads/201807/26/235608g17cdjq23dzq6l57.png)
![10.png](/uploads/201807/26/235608qfqb45xhb57bxhbq.png)
![11.png](/uploads/201807/26/235608qezopvbybppkobhg.png)

# 串口窃取
```
        rt_thread_t tid; 
    tid = rt_thread_create("uart5_thread",
                    uart5_thread_entry, 
                    RT_NULL,
                    4096, 
                    12, 
                    10);
    if (tid != RT_NULL)
        rt_thread_startup(tid);
        
#define UART_RX_EVENT (1 << 0)
static struct rt_event event;
static rt_device_t uart_device = RT_NULL;

static rt_err_t uart_intput(rt_device_t dev, rt_size_t size)
{
        rt_event_send(&event, UART_RX_EVENT);
        
    return RT_EOK;
}

void uart5_thread_entry(void* parameter)
{    
        int fd;
        rt_uint8_t buf[1024] = {0};
        rt_size_t size;
        rt_uint32_t e;
        
        uart_device = rt_device_find("uart5");
        if (uart_device != RT_NULL)
        {
                //rt_device_init(uart_device);
                rt_device_set_rx_indicate(uart_device, uart_intput);
                rt_device_open (uart_device, RT_DEVICE_OFLAG_RDWR | RT_DEVICE_FLAG_INT_RX );
                
                rt_event_init(&event, "event", RT_IPC_FLAG_FIFO); 
        }
        
        while (1)
        {                
                memset(buf, 0, sizeof(buf));
                size = rt_device_read (uart_device, 0, buf, 1024);
                if(size == 0)
                {
                        rt_event_recv(&event, UART_RX_EVENT,RT_EVENT_FLAG_AND | 
                                          RT_EVENT_FLAG_CLEAR,RT_WAITING_FOREVER, &e);
                }
                
                fd = open("uart5.txt", O_RDWR | O_CREAT | O_APPEND, 0);
                write(fd, buf, strlen(buf));
                close(fd);
        }
}
```

运行如下：
![12.png](/uploads/201807/26/235608tiggg0qrsgggc9sr.png)
![13.png](/uploads/201807/26/235609rvelh453gebghgge.png)