1,初始化代码 ADC_InitTypeDef ADC_InitStructure = { 0 }; GPIO_InitTypeDef GPIO_InitStructure = { 0 }; DMA_InitTypeDef DMA_InitStructure = { 0 }; NVIC_InitTypeDef NVIC_InitStructure = { 0 }; RCC_APB2PeriphClockCmd ( RCC_APB2Periph_GPIOA, ENABLE ); RCC_APB2PeriphClockCmd ( RCC_APB2Periph_ADC1, ENABLE ); RCC_AHBPeriphClockCmd ( RCC_AHBPeriph_DMA1, ENABLE ); RCC_ADCCLKConfig ( RCC_PCLK2_Div8 ); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_6; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN; GPIO_Init ( GPIOA, &GPIO_InitStructure ); ADC_DeInit ( ADC1 ); ADC_InitStructure.ADC_Mode = ADC_Mode_Independent; ADC_InitStructure.ADC_ScanConvMode = ENABLE; ADC_InitStructure.ADC_ContinuousConvMode = ENABLE; ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None; ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right; ADC_InitStructure.ADC_NbrOfChannel = PD_CHANNEL_NUM; ADC_Init ( ADC1, &ADC_InitStructure ); ADC_RegularChannelConfig ( ADC1, ADC_Channel_3, 1, ADC_SampleTime_239Cycles5 ); ADC_RegularChannelConfig ( ADC1, ADC_Channel_6, 2, ADC_SampleTime_239Cycles5 ); ADC_Cmd ( ADC1, ENABLE ); ADC_BufferCmd ( ADC1, DISABLE ); // disable buffer ADC_ResetCalibration ( ADC1 ); while (ADC_GetResetCalibrationStatus(ADC1)) ; ADC_StartCalibration ( ADC1 ); while (ADC_GetCalibrationStatus(ADC1)) ; Calibrattion_Val = Get_CalibrationValue ( ADC1 ); DMA_DeInit ( DMA1_Channel1 ); DMA_InitStructure.DMA_PeripheralBaseAddr = (u32) &ADC1->RDATAR; DMA_InitStructure.DMA_MemoryBaseAddr = (u32) adc_dma_buf; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = ADC_DMA_BUF_SIZE * PD_CHANNEL_NUM; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init ( DMA1_Channel1, &DMA_InitStructure ); DMA_ITConfig ( DMA1_Channel1, DMA_IT_TC, ENABLE ); NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel1_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 4; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init ( &NVIC_InitStructure );
2,数据采集够之后,在
DMA1_Channel1_IRQHandler
中,停止采集:
DMA_Cmd ( DMA1_Channel1, DISABLE ); ADC_DMACmd ( ADC1, DISABLE ); DMA1_Channel1->CNTR = 0; ADC_SoftwareStartConvCmd ( ADC1, DISABLE );
3,启动采集
DMA_Cmd ( DMA1_Channel1, DISABLE ); DMA1_Channel1->CNTR = user_curve_avg_size * 2; DMA_Cmd ( DMA1_Channel1, ENABLE ); ADC_DMACmd ( ADC1, ENABLE ); ADC_SoftwareStartConvCmd ( ADC1, ENABLE );
问题,缓冲区是一个
adc_dma_buf[cnt][2] 就是两个通道交替保存采集的数据,多次启动-停止会发现有时候一通道的值会和二通道的值交换位置
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