Posted on July 03, 2014 at 10:34
Hi,
I am trying to let my STM32F429 Disco Board sample in triple mode interleaved. I mainly copied the code from ST, with small changes, and it also works. But the word-array I want the DMA to transfer the data to, has some bugs. every element of the word-array aADCTripleConvertedValue[] keeps two ADC results. The lower half word gets the first result, whereas the upper half word gets the second result: [0]=[ADC2, ADC1] [1]=[ADC1, ADC3] [2]=[ADC3, ADC2] this works fine for the first 6 results. But then I get this: [3]=[2]=[ADC3, ADC2] [4]=[2]=[ADC3, ADC2] [5]=[2]=[ADC3, ADC2] and after that, I get the new results: [6]=[ADC2, ADC1] [7]=[ADC1, ADC3] [8]=[ADC3, ADC2] and again: [9]=[10]=[11]=[8] if you look at the image, you see that there is no data missing, but it looks as if the DMA copies old values, until it gets the new one. If I delete the copied Data, the 300kHz sine looks fine. Does anybody know whats wrong here? code:/**
******************************************************************************
* @file ADC/ADC_TripleModeInterleaved/main.c
* @author MCD Application Team
* @version V1.1.0
* @date 18-January-2013
* @brief Main program body
******************************************************************************
* @attention
*
* <h2><center>© COPYRIGHT 2013 STMicroelectronics</center></h2>
*
* Licensed under MCD-ST Liberty SW License Agreement V2, (the ''License'');
* You may not use this file except in compliance with the License.
* You may obtain a copy of the License at:
*
* http://www.st.com/software_license_agreement_liberty_v2
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an ''AS IS'' BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
******************************************************************************
*/
/* Includes ------------------------------------------------------------------*/
#include ''triple interleaved.h''
#define TripleADCMessungen 120
/** @addtogroup STM32F4xx_StdPeriph_Examples
* @{
*/
/** @addtogroup ADC_TripleModeInterleaved
* @{
*/
/* Private typedef -----------------------------------------------------------*/
/* Private define ------------------------------------------------------------*/
/* Private macro -------------------------------------------------------------*/
/* Private variables ---------------------------------------------------------*/
extern
volatile
uint32_t aADCTripleConvertedValue[TripleADCMessungen];
/* Private function prototypes -----------------------------------------------*/
static
void
ADC_Config(
void
);
/* Private functions ---------------------------------------------------------*/
/**
* @brief Main program
* @param None
* @retval None
*/
void
tripleADCreset(
void
){
DMA_ClearFlag(DMA_STREAMx, DMA_FLAG_TCIF0);
ADC_DeInit();
ADC->CCR &= ~((uint32_t)(0b00000));
}
void
tripleADCstart(
void
)
{
/*!< At this stage the microcontroller clock setting is already configured,
this is done through SystemInit() function which is called from startup
files (startup_stm32f40xx.s/startup_stm32f427x.s) before to branch to
application main.
To reconfigure the default setting of SystemInit() function, refer to
system_stm32f4xx.c file
*/
/* ADC configuration */
ADC_Config();
/* Start ADC1 Software Conversion */
ADC_SoftwareStartConv(ADC1);
}
/**
* @brief ADC configuration
* @note This function Configure the ADC peripheral
1) Enable peripheral clocks
2) Configure ADC Channel 12 pin as analog input
3) DMA2_Stream0 channel2 configuration
4) Configure ADC1 Channel 12
5) Configure ADC2 Channel 12
6) Configure ADC3 Channel 12
* @param None
* @retval None
*/
static
void
ADC_Config(
void
)
{
GPIO_InitTypeDef GPIO_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
ADC_InitTypeDef ADC_InitStructure;
ADC_CommonInitTypeDef ADC_CommonInitStructure;
/* Enable peripheral clocks *************************************************/
RCC_AHB1PeriphClockCmd( ADC1_2_CHANNEL_GPIO_CLK , ENABLE);
RCC_AHB1PeriphClockCmd( RCC_AHB1Periph_DMA2 , ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC1 , ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC2 , ENABLE);
RCC_APB2PeriphClockCmd( RCC_APB2Periph_ADC3 , ENABLE);
/* Configure ADC Channel 13 pin as analog input *****************************/
GPIO_InitStructure.GPIO_Pin = GPIO_PIN;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AN;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL ;
GPIO_Init(GPIO_PORT, &GPIO_InitStructure);
/* DMA2 Stream0 channel0 configuration **************************************/
DMA_InitStructure.DMA_Channel = DMA_CHANNELx;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)ADC_CDR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)&aADCTripleConvertedValue;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = TripleADCMessungen;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Word;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Word;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
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(DMA_STREAMx, &DMA_InitStructure);
/* DMA2_Stream0 enable */
DMA_Cmd(DMA_STREAMx, ENABLE);
/* ADC Common configuration *************************************************/
ADC_CommonInitStructure.ADC_Mode = ADC_TripleMode_Interl;
ADC_CommonInitStructure.ADC_TwoSamplingDelay = ADC_TwoSamplingDelay_5Cycles;
ADC_CommonInitStructure.ADC_DMAAccessMode = ADC_DMAAccessMode_2;
ADC_CommonInitStructure.ADC_Prescaler = ADC_Prescaler_Div2;
ADC_CommonInit(&ADC_CommonInitStructure);
/* ADC1 regular channel 12 configuration ************************************/
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_ExternalTrigConv = ADC_ExternalTrigConv_T1_CC1;
ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;
ADC_InitStructure.ADC_NbrOfConversion = 1;
ADC_Init(ADC1, &ADC_InitStructure);
ADC_RegularChannelConfig(ADC1, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
/* Enable ADC1 DMA */
ADC_DMACmd(ADC1, ENABLE);
/* ADC2 regular channel 12 configuration ************************************/
ADC_Init(ADC2, &ADC_InitStructure);
/* ADC2 regular channel12 configuration */
ADC_RegularChannelConfig(ADC2, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
/* ADC3 regular channel 12 configuration ************************************/
ADC_Init(ADC3, &ADC_InitStructure);
/* ADC3 regular channel12 configuration */
ADC_RegularChannelConfig(ADC3, ADC_CHANNEL, 1, ADC_SampleTime_3Cycles);
ADC_DMARequestAfterLastTransferCmd(ADC1, ENABLE);
/* Enable DMA request after last transfer (multi-ADC mode) ******************/
// ADC_MultiModeDMARequestAfterLastTransferCmd(ENABLE);
/* Enable ADC1 **************************************************************/
ADC_Cmd(ADC1, ENABLE);
/* Enable ADC2 **************************************************************/
ADC_Cmd(ADC2, ENABLE);
/* Enable ADC3 **************************************************************/
ADC_Cmd(ADC3, ENABLE);
}
#ifdef USE_FULL_ASSERT
/**
* @brief Reports the name of the source file and the source line number
* where the assert_param error has occurred.
* @param file: pointer to the source file name
* @param line: assert_param error line source number
* @retval None
*/
void
assert_failed(uint8_t* file, uint32_t line)
{
/* User can add his own implementation to report the file name and line number,
ex: printf(''Wrong parameters value: file %s on line %d\r\n'', file, line) */
/* Infinite loop */
while
(1)
{
}
}
#endif
/**
* @}
*/
/**
* @}
*/
/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/
