关于ADC采集DAC的正弦波采集数据出现问题

li547330575 · 发表于 2020-8-3 16:28:02

如题，我准备用ADC去采集DAC发送的正弦波，卡在DAC输出正弦波这块，由于没有示波器，我选择用ADC去采集，然后发现数据有问题，查表法，采集后发送的数据都在0.3-1V中间波动，
程序：
（DAC部分）
const uint16_t Sine12bit[100]={
0x0800,0x0881,0x0901,0x0980,0x09FD,0x0A79,0x0AF2,0x0B68,0x0BDA,0x0C49,
0x0CB3,0x0D19,0x0D79,0x0DD4,0x0E29,0x0E78,0x0EC0,0x0F02,0x0F3C,0x0F6F,
0x0F9B,0x0FBF,0x0FDB,0x0FEF,0x0FFB,0x0FFF,0x0FFB,0x0FEF,0x0FDB,0x0FBF,
0x0F9B,0x0F6F,0x0F3C,0x0F02,0x0EC0,0x0E78,0x0E29,0x0DD4,0x0D79,0x0D19,
0x0CB3,0x0C49,0x0BDA,0x0B68,0x0AF2,0x0A79,0x09FD,0x0980,0x0901,0x0881,
0x0800,0x077F,0x06FF,0x0680,0x0603,0x0587,0x050E,0x0498,0x0426,0x03B7,
0x034D,0x02E7,0x0287,0x022C,0x01D7,0x0188,0x0140,0x00FE,0x00C4,0x0091,
0x0065,0x0041,0x0025,0x0011,0x0005,0x0001,0x0005,0x0011,0x0025,0x0041,
0x0065,0x0091,0x00C4,0x00FE,0x0140,0x0188,0x01D7,0x022C,0x0287,0x02E7,
0x034D,0x03B7,0x0426,0x0498,0x050E,0x0587,0x0603,0x0680,0x06FF,0x077F,
};
uint16_t DualSine12bit[100];

查表：
for (Idx = 0; Idx <100; Idx++)
{
DualSine12bit[Idx] = (Sine12bit[Idx] << 16)+ (Sine12bit[Idx]);
}
HAL_TIM_Base_Start(&htim6);
HAL_DAC_Start_DMA(&hdac,DAC_CHANNEL_1,(uint32_t *)DualSine12bit,100,DAC_ALIGN_12B_R);

然后main里进行ADC采集
ADC采集程序：
if (HAL_ADCEx_Calibration_Start(&hadc1, ADC_SINGLE_ENDED) !=  HAL_OK)
  {
Error_Handler();
  }
HAL_ADC_Start_DMA(&hadc1,(uint32_t *)&aADCxConvertedData,ADC_CONVERTED_DATA_BUFFER_SIZE);
  while (1)
  {
for(u8 i=0;i<ADC_CONVERTED_DATA_BUFFER_SIZE;i++)
{ADC_VALUE[i]=aADCxConvertedData[i];
voltage[i] = (float)ADC_VALUE[i]*(3.3/4095);
}
for(u8 i=0;i<ADC_CONVERTED_DATA_BUFFER_SIZE;i++)
{printf("voltage%1d:%.4fV\r\n",i,voltage[i]);
}

这里是之前测试多通道采集可以运行，就没改动，直接进行采集