SDADC1 does not work when start the DMA on STM32F373

dongjingui · ‎2013-07-17

Posted on July 18, 2013 at 04:17

Hi,everyone

I have a question about SDADC and DMA.when I

enable

the DMA with'' DMA_Cmd(DMA2_Channel3, ENABLE)'' in program and the SDADC1 stop convert immediately.

here is my code:

void SDADC1_Config()

{

SDADC_InitTypeDef SDADC_InitStructure;

SDADC_AINStructTypeDef SDADC_AINStructure;

GPIO_InitTypeDef GPIO_InitStructure;

uint32_t SDADCTimeout = 0;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_SDADC1, ENABLE);

SDADC_DeInit(SDADC1);

/* PWR APB1 interface clock enable */

RCC_APB1PeriphClockCmd(RCC_APB1Periph_PWR, ENABLE);

/* Enable SDADC analog interface */

PWR_SDADCAnalogCmd(PWR_SDADCAnalog_1, ENABLE);

/* Set the SDADC divider: The SDADC should run @6MHz */

/* If Sysclk is 72MHz, SDADC divider should be 12 */

RCC_SDADCCLKConfig(RCC_SDADCCLK_SYSCLK_Div12);

/* GPIO Peripheral clock enable */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_GPIOE, ENABLE);

/* SDADC channel 3P pin configuration: PE7 */

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;

GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7;

GPIO_Init(GPIOE, &GPIO_InitStructure);

/* Select External reference: The reference voltage selection is available

only in SDADC1 and therefore to select the VREF for SDADC2/SDADC3, SDADC1

clock must be already enabled */

SDADC_VREFSelect(SDADC_VREF_Ext);

/* Insert delay equal to ~5 ms */

// Delay(2);

SDADC_Cmd(SDADC1, ENABLE);

SDADC_InitModeCmd(SDADC1, ENABLE);

SDADCTimeout = 30;

/* wait for INITRDY flag to be set */

while((SDADC_GetFlagStatus(SDADC1, SDADC_FLAG_INITRDY) == RESET) && (--SDADCTimeout != 0));

// if(SDADCTimeout == 0)

// {

// /* INITRDY flag can not set */

// return 1;

// }

SDADC_AINStructure.SDADC_InputMode =SDADC_InputMode_SEOffset; //SDADC_InputMode_SEZeroReference;

SDADC_AINStructure.SDADC_Gain = SDADC_Gain_1_2;//GAIN is 0.5

SDADC_AINStructure.SDADC_CommonMode = SDADC_CommonMode_VSSA;

SDADC_AINStructure.SDADC_Offset = 0;

SDADC_AINInit(SDADC1, SDADC_Conf_0, &SDADC_AINStructure);

/* Channel3 configuration */

SDADC_InitStructure.SDADC_Channel = SDADC_Channel_3;

SDADC_InitStructure.SDADC_ContinuousConvMode = ENABLE;

SDADC_InitStructure.SDADC_FastConversionMode = DISABLE;

SDADC_Init(SDADC1, &SDADC_InitStructure);

SDADC_DMAConfig(SDADC1,SDADC_DMATransfer_Regular, ENABLE);

SDADC_ChannelConfig(SDADC1, SDADC_Channel_3, SDADC_Conf_0);

SDADC_InitModeCmd(SDADC1, DISABLE);

/* configure calibration to be performed on conf0 */

SDADC_CalibrationSequenceConfig(SDADC1, SDADC_CalibrationSequence_1);

/* start PT100_SDADC Calibration */

SDADC_StartCalibration(SDADC1);

/* Set calibration timeout: 5.12 ms at 6 MHz in a single calibration sequence */

SDADCTimeout = 4*30720 ;

/* wait for PT100_SDADC Calibration process to end */

while((SDADC_GetFlagStatus(SDADC1, SDADC_FLAG_EOCAL) == RESET) && (--SDADCTimeout != 0));

// if(SDADCTimeout == 0)

// {

// /* EOCAL flag can not set */

// return 2;

// }

// /* SDADC successfully configured */

// return 0;

SDADC_SoftwareStartConv(SDADC1);

}

void DMA2_Configuration(void)

{

DMA_InitTypeDef DMA_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

/* Enable DMA2 clock */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE);

/* Config the DMA2 channel 3 */

DMA_DeInit(DMA2_Channel3);

DMA_InitStructure.DMA_PeripheralBaseAddr = ((uint32_t)&SDADC1->RDATAR);

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Volt_Buffer;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = N;

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_Low;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA2_Channel3, &DMA_InitStructure);

NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel3_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3;

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;

NVIC_Init(&NVIC_InitStructure);

/* Enable DMA2 Channel3 Transfer half and Complete interrupt */

DMA_ITConfig(DMA2_Channel3, DMA_IT_TC , ENABLE);

/* Enable DMA2 Channel3 */

DMA_Cmd(DMA2_Channel3, ENABLE);

}

Who can tell me,how to use 16bit SDADC with DMA??

Tesla DeLorean · ‎2013-07-17

Posted on July 18, 2013 at 04:58

Unfortunately the code is insufficiently complete to really evaluate.

One line does trouble me, and suspect it causes the DMA to fault.

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Volt_Buffer;

I don't see a definition for the buffer but assume it's uint16_t Volt_Buffer[N];

The correct code would be

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&Volt_Buffer[0];

or

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)Volt_Buffer;

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dongjingui · ‎2013-07-17

Posted on July 18, 2013 at 05:22

thanks very much! I changed ,but the SDADC is still does not work......