ADC采集时候，会影响DAC的电压输出大概有6mv压降和1ms左右的持续间隔

发布于 2024-09-04 16:47:04 浏览：338 订阅该版

ADC采集时候，会影响DAC的电压输出大概有6mv压降和1ms左右的持续间隔。
你们是否有测试过有这样的问题。如图，目前不知道为什么读取ADC都会影响DAC值输出

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![微信图片_20240904164215.jpg](https://oss-club.rt-thread.org/uploads/20240904/ca68a0c5390aca1f1096d542656e47e5.jpg.webp)

![微信图片_20240904164206.jpg](https://oss-club.rt-thread.org/uploads/20240904/9c2ec18e4a5c1485903c30f8853c73da.jpg.webp)

//查找设备
    adc_dev = (rt_adc_device_t)rt_device_find(ADC_DEV_NAME);

if (adc_dev == RT_NULL)
    {
       rt_kprintf("No Device");
    }

rt_kprintf("ADC Collection time start!");
    rt_adc_enable(adc_dev, sensorchannel_num[channel_index]);
    while(1)
    {
        //rt_thread_mdelay(50);
        adc_value=(rt_uint16_t)rt_adc_read(adc_dev, sensorchannel_num[channel_index]);
        adc_smooth_buf[channel_index][smooth_index]=adc_value;
        //rt_adc_disable(adc_dev, sensorchannel_num[channel_index]);
        //LOG_D("ADC channel-%d,value=%d",channel_index,adc_value);
        channel_index++;
        if(channel_index>=2)
        {
            channel_index=0;
            smooth_index++;
            if(smooth_index>=smooth_num)
                smooth_index=0;
        }