【DigiKey“智造万物,快乐不停”创意大赛】ADC-DMA
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STM32H73B 有2个ADC,功能非常强大。可以运行在差分模式或单端模式。可以设置16、14、12、10或8位的转换分辨率。
本次评测就使用ADC2的内部温度传感器通道,以DMA数据传输方式进行16位ADC转换。
系统时钟配置
CUBE MX的ADC2配置
ADC的DMA配置
设置DMA连续转换10次方式
部分代码
void MX_ADC2_Init(void)
{
ADC_ChannelConfTypeDef sConfig = {0};
hadc2.Instance = ADC2;
hadc2.Init.ClockPrescaler = ADC_CLOCK_ASYNC_DIV1;
hadc2.Init.Resolution = ADC_RESOLUTION_16B;
hadc2.Init.ScanConvMode = ADC_SCAN_DISABLE;
hadc2.Init.EOCSelection = ADC_EOC_SINGLE_CONV;
hadc2.Init.LowPowerAutoWait = DISABLE;
hadc2.Init.ContinuousConvMode = ENABLE;
hadc2.Init.NbrOfConversion = 1;
hadc2.Init.DiscontinuousConvMode = DISABLE;
hadc2.Init.ExternalTrigConv = ADC_SOFTWARE_START;
hadc2.Init.ExternalTrigConvEdge = ADC_EXTERNALTRIGCONVEDGE_NONE;
hadc2.Init.ConversionDataManagement = ADC_CONVERSIONDATA_DMA_CIRCULAR;
hadc2.Init.Overrun = ADC_OVR_DATA_PRESERVED;
hadc2.Init.LeftBitShift = ADC_LEFTBITSHIFT_NONE;
hadc2.Init.OversamplingMode = DISABLE;
if (HAL_ADC_Init(&hadc2) != HAL_OK)
{
Error_Handler();
}
sConfig.Channel = ADC_CHANNEL_TEMPSENSOR;
sConfig.Rank = ADC_REGULAR_RANK_1;
sConfig.SamplingTime = ADC_SAMPLETIME_810CYCLES_5;
sConfig.SingleDiff = ADC_SINGLE_ENDED;
sConfig.OffsetNumber = ADC_OFFSET_NONE;
sConfig.Offset = 0;
sConfig.OffsetSignedSaturation = DISABLE;
if (HAL_ADC_ConfigChannel(&hadc2, &sConfig) != HAL_OK)
{
Error_Handler();
}
if(HAL_ADC_Start_DMA(&hadc2, (uint32_t*)&uhADCxValue, 10) != HAL_OK)
{
Error_Handler();
}
}
void HAL_ADC_MspInit(ADC_HandleTypeDef* adcHandle)
{
if(adcHandle->Instance==ADC2)
{
__HAL_RCC_ADC12_CLK_ENABLE();
hdma_adc2.Instance = DMA1_Stream0;
hdma_adc2.Init.Request = DMA_REQUEST_ADC2;
hdma_adc2.Init.Direction = DMA_PERIPH_TO_MEMORY;
hdma_adc2.Init.PeriphInc = DMA_PINC_DISABLE;
hdma_adc2.Init.MemInc = DMA_MINC_ENABLE;
hdma_adc2.Init.PeriphDataAlignment = DMA_PDATAALIGN_WORD;
hdma_adc2.Init.MemDataAlignment = DMA_MDATAALIGN_WORD;
hdma_adc2.Init.Mode = DMA_CIRCULAR;
hdma_adc2.Init.Priority = DMA_PRIORITY_LOW;
hdma_adc2.Init.FIFOMode = DMA_FIFOMODE_DISABLE;
if (HAL_DMA_Init(&hdma_adc2) != HAL_OK)
{
Error_Handler();
}
__HAL_LINKDMA(adcHandle,DMA_Handle,hdma_adc2);
}
}
暂时在变量窗口显示运行结果,
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