Multi channel ADC

Posted on May 17, 2011 at 13:29

Hi,

I use STM32F103T4 for voltage monitoring. I need all 10 channels. I modified an ADC example from the lib, please see the code below:

/* Private macro -------------------------------------------------------------*/

#define ADC1_DR_Address ((vu32) 0x4001244C)

/* Private variables ---------------------------------------------------------*/

ADC_InitTypeDef ADC_InitStructure;

DMA_InitTypeDef DMA_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

vu16 ADC_ConvertedValue[10];

/* DMA Channel1 Configuration ----------------------------------------------*/

DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;

DMA_InitStructure.DMA_MemoryBaseAddr = (vu32) &ADC_ConvertedValue;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = 10;

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_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Enable DMA Channel1 */

DMA_Cmd(DMA1_Channel1, ENABLE);

/* ADCx Configuration (ADC1CLK = 14 MHz) -----------------------------------*/

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 = 11;

ADC_Init(ADC1, &ADC_InitStructure);

/* ADCx Regular Channel_0-9 Configuration */

ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_1Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_7Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_13Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_28Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_41Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_71Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_239Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 9, ADC_SampleTime_1Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 10, ADC_SampleTime_7Cycles5);

// ADC1 configuration (vref)

ADC_RegularChannelConfig(ADC1, ADC_Channel_17, 12, ADC_SampleTime_239Cycles5);

/* Enable ADCx's DMA interface */

ADC_DMACmd(ADC1, ENABLE);

/* Enable ADCx */

ADC_Cmd(ADC1, ENABLE);

ADC_TempSensorVrefintCmd(ENABLE);

/* Start ADC1 Software Conversion */

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

while(1)

{

}

My problem is only the first element of ADC_ConvertedValue[10] is updated. Could any of you point me what is missing/wrong with my code? Thanks in advance!

Best Regards,

Alex

Posted on May 17, 2011 at 13:29

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Disable;

seems wrong becouse destination address needs increment

Further, I cannot see any reason, why the STM Examples always redefine

their own headers inside main.c

Instead of

#define ADC1_DR_Address ((vu32) 0x4001244C)

try:

DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;

[ This message was edited by: Janvi on 05-11-2009 10:49 ]

Posted on May 17, 2011 at 13:29

Hi,

Thanks for your help! It works fine.

Best Regards,

Alex