How to Set Up DMA for ADC1

[epalaima]

Posted on July 05, 2016 at 22:09

I am trying to set up direct memory access for ADC1. I have already configured direct memory access for ADC3 using an example I found here:

This works for ADC 3, but when I try to change the parameters to set up ADC 1 I don't get any conversion. I change the DMA stream to 4 for ADC1, the GPIO pin to PC1, all reference to ADC number to 1, channel to 11, rank to 2 and DR_ADDRESS to a number I found in the datasheet. I am thinking that maybe I have assigned the wrong DR_ADDRESS for ADC 1. Is there anything else I am missing in there? Here are the two different methods I use, let me know if you spot anything: #define ADC3_DR_ADDRESS     ((uint32_t)0x4001224C) void ADC3_CH12_DMA_Config(void) {   ADC_InitTypeDef       ADC_InitStructure;   ADC_CommonInitTypeDef ADC_CommonInitStructure;   DMA_InitTypeDef       DMA_InitStructure;   GPIO_InitTypeDef      GPIO_InitStructure;   /* Enable ADC3, DMA2 and GPIO clocks ****************************************/   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC3, ENABLE);   /* DMA2 Stream0 channel0 configuration **************************************/   DMA_InitStructure.DMA_Channel = DMA_Channel_2;     DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC3_DR_ADDRESS;   DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC3ConvertedValue;   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;   DMA_InitStructure.DMA_BufferSize = 1;   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;   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_High;   DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;            DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;   DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;   DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;   DMA_Init(DMA2_Stream0, &DMA_InitStructure);   DMA_Cmd(DMA2_Stream0, ENABLE);   /* Configure ADC3 Channel12 pin as analog input ******************************/   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;   GPIO_Init(GPIOC, &GPIO_InitStructure);   /* ADC Common Init **********************************************************/   ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;   ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;   ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;   ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;   ADC_CommonInit(&ADC_CommonInitStructure);   /* ADC3 Init ****************************************************************/   ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;   ADC_InitStructure.ADC_ScanConvMode = DISABLE;   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;   ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;   ADC_InitStructure.ADC_NbrOfConversion = 1;   ADC_Init(ADC3, &ADC_InitStructure);   /* ADC3 regular channel12 configuration *************************************/   ADC_RegularChannelConfig(ADC3, ADC_Channel_12, 1, ADC_SampleTime_3Cycles); //sample time 3 cycles  /* Enable DMA request after last transfer (Single-ADC mode) */   ADC_DMARequestAfterLastTransferCmd(ADC3, ENABLE);   /* Enable ADC3 DMA */   ADC_DMACmd(ADC3, ENABLE);   /* Enable ADC3 */   ADC_Cmd(ADC3, ENABLE); } #define ADC1_DR_ADDRESS     ((uint32_t)0x40012000) void ADC1_CH11_DMA_Config(void) {   ADC_InitTypeDef       ADC_InitStructure;   ADC_CommonInitTypeDef ADC_CommonInitStructure;   DMA_InitTypeDef       DMA_InitStructure;   GPIO_InitTypeDef      GPIO_InitStructure;   /* Enable ADC3, DMA2 and GPIO clocks ****************************************/   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2 | RCC_AHB1Periph_GPIOC, ENABLE);   RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1, ENABLE);   /* DMA2 Stream4 channel0 configuration **************************************/   DMA_InitStructure.DMA_Channel = DMA_Channel_2;   DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC1_DR_ADDRESS;   DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&ADC1ConvertedValue;   DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;   DMA_InitStructure.DMA_BufferSize = 1;   DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;   DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;   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_High;   DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;   DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;   DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;   DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;   DMA_Init(DMA2_Stream4, &DMA_InitStructure);   DMA_Cmd(DMA2_Stream4, ENABLE);   /* Configure ADC1 Channel0 pin as analog input ******************************/   GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1;   GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;   GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;   GPIO_Init(GPIOC, &GPIO_InitStructure);   /* ADC Common Init **********************************************************/   ADC_CommonInitStructure.ADC_Mode = ADC_Mode_Independent;   ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;   ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_Disabled;   ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;   ADC_CommonInit(&ADC_CommonInitStructure);   /* ADC1 Init ****************************************************************/   ADC_InitStructure.ADC_Resolution = ADC_Resolution_12b;   ADC_InitStructure.ADC_ScanConvMode = DISABLE;   ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;   ADC_InitStructure.ADC_ExternalTrigConvEdge = ADC_ExternalTrigConvEdge_None;   ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;   ADC_InitStructure.ADC_NbrOfConversion = 1;   ADC_Init(ADC1, &ADC_InitStructure);   /* ADC1 regular channel11 configuration *************************************/   ADC_RegularChannelConfig(ADC1, ADC_Channel_11, 2, ADC_SampleTime_3Cycles); //sample time 3 cycles  /* Enable DMA request after last transfer (Single-ADC mode) */   ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);   /* Enable ADC1 DMA */   ADC_DMACmd(ADC1, ENABLE);   /* Enable ADC1 */   ADC_Cmd(ADC1, ENABLE); }

[Tesla DeLorean]

Posted on July 05, 2016 at 22:17

Wrong Channel

One can compute the address of the data register. ie &ADC1->DR

[Tesla DeLorean]

Posted on July 05, 2016 at 22:19

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[epalaima]

Posted on July 07, 2016 at 22:27

Nevermind, problem solved. I was confusing the number in DMA2 with the DMA channel number. I have all 3 ADCs doing conversion. Thanks for all your help.