STM32的ADC配合DMA为什么只转换一半！

#ifndef __ADC_DMA_H__

#define __ADC_DMA_H__



#include "stm32f10x.h"



#define ADC_DMA_SIZE 16



#define ADC_DR_Address ((uint32_t)0x4001244C)



void ADC_Config(void);

void ADC_DMA_Config(void);

void ADC_DMA_Standard_Init(void);

extern void ADC_DMA_Init(void);

extern uint16_t *Read_Convert_Buf(uint16_t *dst);



#endif

void ADC_DMA_Standard_Init(void)

{

GPIO_InitTypeDef GPIO_InitStructure;

ADC_InitTypeDef ADC_InitStructure;

DMA_InitTypeDef DMA_InitStructure;



/* Enable peripheral clocks --------------------------------------------------*/

/* Enable DMA1 clock */

RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);



/* Enable ADC1 and GPIOC clock */

RCC_APB2PeriphClockCmd(RCC_APB2Periph_ADC1 | RCC_APB2Periph_GPIOC, ENABLE);



/* Configure PC.04 (ADC Channel14) as analog input -------------------------*/

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AIN;

GPIO_Init(GPIOC, &GPIO_InitStructure);



DMA_DeInit(DMA1_Channel1);

DMA_InitStructure.DMA_PeripheralBaseAddr = ADC_DR_Address;

DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)ConvertBuf;

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;

DMA_InitStructure.DMA_BufferSize = ADC_DMA_SIZE;

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_Normal;

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);



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

ADC_InitStructure.ADC_Mode = ADC_Mode_Independent;

ADC_InitStructure.ADC_ScanConvMode = DISABLE;

ADC_InitStructure.ADC_ContinuousConvMode = ENABLE;

ADC_InitStructure.ADC_ExternalTrigConv = ADC_ExternalTrigConv_None;

ADC_InitStructure.ADC_DataAlign = ADC_DataAlign_Right;

ADC_InitStructure.ADC_NbrOfChannel = 1;

ADC_Init(ADC1, &ADC_InitStructure);



/* ADC1 regular channel14 configuration */ 

ADC_RegularChannelConfig(ADC1, ADC_Channel_14, 1, ADC_SampleTime_55Cycles5);



/* Enable ADC1 DMA */

ADC_DMACmd(ADC1, ENABLE);



/* Enable ADC1 */

ADC_Cmd(ADC1, ENABLE);



/* Enable ADC1 reset calibaration register */ 

ADC_ResetCalibration(ADC1);

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

while(ADC_GetResetCalibrationStatus(ADC1));



/* Start ADC1 calibaration */

ADC_StartCalibration(ADC1);

/* Check the end of ADC1 calibration */

while(ADC_GetCalibrationStatus(ADC1));



/* Start ADC1 Software Conversion */ 

ADC_SoftwareStartConvCmd(ADC1, ENABLE);

}



void ADC_DMA_Init(void)

{

ADC_DMA_Standard_Init();



printf("ADC_DMA_Init ok.\n");

}



uint16_t *Read_Convert_Buf(uint16_t *dst)

{

if (SET == DMA_GetFlagStatus(DMA1_IT_TC1))

{

ADC_Cmd(ADC1, DISABLE);

ADC_DMACmd(ADC1, DISABLE);

DMA_Cmd(DMA1_Channel1, DISABLE);

memset(dst, 0, ADC_DMA_SIZE);

memcpy(dst, ConvertBuf, ADC_DMA_SIZE);

memset(ConvertBuf, 0, ADC_DMA_SIZE);

DMA1_Channel1->CNDTR = ADC_DMA_SIZE;

DMA_ClearFlag(DMA1_IT_TC1);

//DMA_Cmd(DMA1_Channel1, ENABLE);

return dst;

}

return NULL;

}