终端调试台无法输入指令

发布于 2021-10-08 09:55:17 浏览：2496 订阅该版

![image.png](https://oss-club.rt-thread.org/uploads/20211008/636a5d5dc27b5d62a5af7c7b954ce83f.png.webp)

大家好！想请教一下大家，我把程序烧录进板子，串口没有打印，就想在终端输入list_thread查看一下线程的状态，但发现无法输入这些指令。请问一下这是出了什么问题？（我写的程序是开启硬件定时器，每1s开启中断读取滴答值，下面是我的程序）

```c
#include <rtthread.h>
#include <rtdevice.h>
#include <tim3.h>

#define HWTIMER_DEV_NAME   "timer3"     /* 定时器名称 */

#define ADC_DEV_NAME        "adc2"      /* ADC 设备名称 */
#define ADC_DEV_CHANNEL     3           /* ADC 通道 */
#define REFER_VOLTAGE       330         /* 参考电压 3.3V,数据精度乘以100保留2位小数*/
#define CONVERT_BITS        (1 << 12)   /* 转换位数为12位 */

rt_adc_device_t adc_dev;
int i= 0;

/* 定时器超时回调函数 */
rt_err_t timeout_cb(rt_device_t dev, rt_size_t size)
{
    rt_kprintf("this is hwtimer timeout callback fucntion!\n");
    rt_kprintf("tick is :%d !\n", rt_tick_get());
//    rt_uint32_t value;
//    value = rt_adc_read(adc_dev, ADC_DEV_CHANNEL);
//    ADC2_Buffer[i++] = value;
//    if(i==10)
//    {
//        i = 0;
//    }
//    for(int j = 0;j<10;j++)
//    {
//        rt_kprintf("%d\n",ADC2_FFT_Buffer[j]);
//    }
//    rt_kprintf("%d\n",value);

return 0;
}

int tim3_init(void)
{
    rt_err_t ret = RT_EOK;
    rt_hwtimerval_t timeout_s;      /* 定时器超时值 */
    rt_device_t hw_dev = RT_NULL;   /* 定时器设备句柄 */
    rt_hwtimer_mode_t mode;         /* 定时器模式 */

/*    查找adc2设备
    adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);
    if (adc_dev == RT_NULL)
    {
        rt_kprintf("adc2 run failed! can't find %s device!\n", ADC_DEV_NAME);
    }
     使能adc2设备
    ret = rt_adc_enable(adc_dev, ADC_DEV_CHANNEL);
    if(ret == RT_EOK)
    {
        rt_kprintf("adc2 run success\n");
    }*/

/* 查找定时器设备 */
    hw_dev = rt_device_find(HWTIMER_DEV_NAME);
    if (hw_dev == RT_NULL)
    {
        rt_kprintf("hwtimer sample run failed! can't find %s device!\n", HWTIMER_DEV_NAME);
        return RT_ERROR;
    }

/* 以读写方式打开设备 */
    ret = rt_device_open(hw_dev, RT_DEVICE_OFLAG_RDWR);
    if (ret != RT_EOK)
    {
        rt_kprintf("open %s device failed!\n", HWTIMER_DEV_NAME);
        return ret;
    }

/* 设置超时回调函数 */
    rt_device_set_rx_indicate(hw_dev, timeout_cb);

/* 设置模式为周期性定时器 */
    mode = HWTIMER_MODE_PERIOD;
    ret = rt_device_control(hw_dev, HWTIMER_CTRL_MODE_SET, &mode);
    if (ret != RT_EOK)
    {
        rt_kprintf("set mode failed! ret is :%d\n", ret);
        return ret;
    }

/* 设置定时器超时值为5s并启动定时器 */
    timeout_s.sec =  1;      /* 秒 */
    timeout_s.usec = 0;     /* 微秒 */

if (rt_device_write(hw_dev, 0, &timeout_s, sizeof(timeout_s)) != sizeof(timeout_s))
    {
        rt_kprintf("set timeout value failed\n");
        return RT_ERROR;
    }

/* 延时3500ms */
    rt_thread_mdelay(3500);

//    /* 读取定时器当前值 */
//    rt_device_read(hw_dev, 0, &timeout_s, sizeof(timeout_s));
//    rt_kprintf("Read: Sec = %d, Usec = %d\n", timeout_s.sec, timeout_s.usec);

return ret;
}

```