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原创 STM32_DMA+ADC多路采集（错位问题）

 2013-6-4 21:59  6333 9 10 分类: MCU/ 嵌入式文集: ST-NXP

使用时遇到的问题：

我使用是的STM32F103ZET6，同时使用ADC1的16个通道，ADC3的5个通道，都使用DMA来传输，问题：比如ADC1_CH0通道上的值保存到了Buffer[1],其他数据往后移，ADC1_CH15的数据出现在Buffer[0]上，更不可失意的的是，有是ADC1_CH0通道的值出现在Buffer[2]上，其他的往后移，ADC1_CH14，ADC1_CH15则出现在Buffer[0],Buffer[1]上。请大家是否有朋友也碰到过。

总结：（1）一定要配置好ADC之后，才使能DMA

（2）ADC首先要进行默认初始化。

源代码：

（1）

uint16_t ADC1Buffer[16];

uint16_t ADC3Buffer[5];

#define ADC1_DR_Address ((uint32_t)0x4001244C)

#define ADC3_DR_Address ((uint32_t)0x40013C4C)

#define ADC1CounvNum (16)

#define ADC3CounvNum (5)

/**************************************************************************

**函数功能：DMA的配置文件

**入口参数：无

**出口参数：无

**调用本函数：main.c

**************************************************************************/

void DMA_Config(void)

{

DMA_InitTypeDef DMA_InitStructure;

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1 | RCC_AHBPeriph_DMA2, ENABLE);

/* DMA1 channel1 configuration ----------------------------------------------*/

DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC1_DR_Address;

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC1Buffer;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = ADC1CounvNum;

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_High;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA1_Channel1, &DMA_InitStructure);

/* Enable DMA1 channel1 */

//DMA_Cmd(DMA1_Channel1, ENABLE);

/* DMA2 channel5 configuration ----------------------------------------------*/

DMA_DeInit(DMA2_Channel5);

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC3_DR_Address;

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ADC3Buffer;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = ADC3CounvNum;

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_Medium;

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;

DMA_Init(DMA2_Channel5, &DMA_InitStructure);

/* Enable DMA2 channel5 */

// DMA_Cmd(DMA2_Channel5, ENABLE);

}

（2）

#include "stm32f10x.h"

#include "ADC_Init.h"

#define ConvSuccess (1)

#define ADC1CounvNum (16)

#define ADC3CounvNum (5)

/**************************************************************************

**函数功能：ADC的配置文件

**入口参数：无

**出口参数：无

**调用本函数：main.c

**************************************************************************/

void ADC_Config(void)

{

ADC_InitTypeDef ADC_InitStructure;

GPIO_InitTypeDef GPIO_InitStructure;

// RCC_ADCCLKConfig(RCC_PCLK2_Div4);

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_ADC3| RCC_APB2Periph_GPIOA

| RCC_APB2Periph_GPIOB| RCC_APB2Periph_GPIOC| RCC_APB2Periph_GPIOF, ENABLE);

/* Configure PA as analog input -------------------------*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3

|GPIO_Pin_4|GPIO_Pin_5|GPIO_Pin_6|GPIO_Pin_7;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOA, &GPIO_InitStructure);

/* Configure PB as analog input -------------------------*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOB, &GPIO_InitStructure);

/* Configure PC as analog input -------------------------*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_0|GPIO_Pin_1|GPIO_Pin_2|GPIO_Pin_3

|GPIO_Pin_4|GPIO_Pin_5;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOC, &GPIO_InitStructure);

/* Configure PF as analog input -------------------------*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_7|GPIO_Pin_8|GPIO_Pin_9

|GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOF, &GPIO_InitStructure);

ADC_DeInit(ADC1);

/* ADC1 configuration ------------------------------------------------------*/

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 = ADC1CounvNum;

ADC_Init(ADC1, &ADC_InitStructure);

/* ADC1 regular channel5 configuration */

ADC_RegularChannelConfig(ADC1, ADC_Channel_0, 1, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_1, 2, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_2, 3, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_3, 4, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_4, 5, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_5, 6, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_6, 7, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_7, 8, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_8, 9, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_9, 10, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_10,11, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_11,12, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_12,13, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_13,14, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_14,15, ADC_SampleTime_55Cycles5);

ADC_RegularChannelConfig(ADC1, ADC_Channel_15,16, ADC_SampleTime_55Cycles5);

/* Enable ADC1 DMA */

// ADC_DMACmd(ADC1, ENABLE);

ADC_DeInit(ADC3);

/* ADC3 configuration ------------------------------------------------------*/

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 = ADC3CounvNum;

ADC_Init(ADC3, &ADC_InitStructure);

/* ADC3 regular channel14 configuration */

ADC_RegularChannelConfig(ADC3, ADC_Channel_4, 1, ADC_SampleTime_7Cycles5);

ADC_RegularChannelConfig(ADC3, ADC_Channel_5, 2, ADC_SampleTime_7Cycles5);

ADC_RegularChannelConfig(ADC3, ADC_Channel_6, 3, ADC_SampleTime_7Cycles5);

ADC_RegularChannelConfig(ADC3, ADC_Channel_7, 4, ADC_SampleTime_7Cycles5);

ADC_RegularChannelConfig(ADC3, ADC_Channel_8, 5, ADC_SampleTime_7Cycles5);

/* Enable ADC3 DMA */

//ADC_DMACmd(ADC3, ENABLE);

/* Enable ADC1 */

ADC_Cmd(ADC1, ENABLE);

ADC_DMACmd(ADC1, ENABLE);

/* Enable ADC1 reset calibration register */

ADC_ResetCalibration(ADC1);

/* Check the end of ADC1 reset calibration register */

while(ADC_GetResetCalibrationStatus(ADC1));

/* Start ADC1 calibration */

ADC_StartCalibration(ADC1);

/* Check the end of ADC1 calibration */

while(ADC_GetCalibrationStatus(ADC1));

/* Enable ADC3 */

ADC_Cmd(ADC3, ENABLE);

ADC_DMACmd(ADC3, ENABLE);

/* Enable ADC3 reset calibration register */

ADC_ResetCalibration(ADC3);

/* Check the end of ADC3 reset calibration register */

while(ADC_GetResetCalibrationStatus(ADC3));

/* Start ADC3 calibration */

ADC_StartCalibration(ADC3);

/* Check the end of ADC3 calibration */

while(ADC_GetCalibrationStatus(ADC3));

DMA_Cmd(DMA1_Channel1, ENABLE);

/* Start ADC1 Software Conversion */

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

DMA_Cmd(DMA2_Channel5, ENABLE);

/* Start ADC3 Software Conversion */

ADC_SoftwareStartConvCmd(ADC3, ENABLE);

}

stm32

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用户377235 2015-12-22 18:24

采样时间太短了

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