DMA_USART1通信收发不正常

STM32F2_ · 发表于 2016-3-17 09:48:57

#include "stm32f2xx.h"
#include <stdio.h>
#define USART1_DR_ADDRESS             ((uint32_t)USART1 + 0x04)
#define DMA_Rec_Len 32 //DMA½óêÕ»o′æÇø′óD¡

void RCC_Configuration(void);
void NVIC_Configuration(void);
void GPIO_Configuration(void);
void USART_Configuration(void);
void DMA_Configuration(void);
void USART1_SendString(uint8_t *ch);
void UART1_SendByte(uint16_t Data);
void USART1_Send(u8 *buf,u8 len);

uint8_t DMA_Rece_Buf[DMA_Rec_Len]; //DMA½óêÕ»o′æÇø
int16_t USART1_Rec_Cnt=0,flag=0; //½óêÕμ½×Ö·û′®′óD¡
uint8_t j[]="transfer completely!";

int main(void)
{
  //int16_t j;
uint8_t i;

  RCC_Configuration();
  GPIO_Configuration();
  USART_Configuration();

DMA_Configuration();

NVIC_Configuration();
for(i=0;i<DMA_Rec_Len;i++)
{
DMA_Rece_Buf[i]=0;
}

  while (1)
  {
if(flag!=0)
{
USART1_SendString(j);
flag=0;
}
/*½«êÕμ½μÄêy¾Y·￠»Øè￥ ¿éòÔêÇÆäËûÖ÷3ìDò
if(USART_GetFlagStatus(USART1,USART_IT_RXNE)==SET)
{
i = USART_ReceiveData(USART1);
USART_SendData(USART1, i);
for(j=0;j<500;j++);
}*/
}

}

void DMA_Configuration(void)
{
  DMA_InitTypeDef  DMA_InitStructure;
DMA_DeInit(DMA2_Stream5);                //3õê¼»ˉDMA2_Stream5
DMA_InitStructure.DMA_Channel = DMA_Channel_4; //Ñ¡Ôñí¨μà5
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory; //′«êä·½ÏòÎaíaéèμ½DMA
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_ADDRESS; //íaéèμØÖ·
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)DMA_Rece_Buf; //DMA½óêÕ»o′æÇøμØÖ·
DMA_InitStructure.DMA_BufferSize = DMA_Rec_Len; //½óêÕ»o′æÇø′óD¡
DMA_Init(DMA2_Stream5, &DMA_InitStructure); //éèÖÃDMA2_Stream5

  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //íaéèμØÖ·2»μYÔö
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //Äú′æμØÖ·μYÔö
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord; //íaéèêy¾Y¿í¶èÎa8Î»
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord; //Äú′æêy¾Y¿í¶èÎa8Î»
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //DMAÄ￡ê½ÎaÑ-»·Ä￡ê½
  DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; //óÅÏè¼¶×î¸ß
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  /*DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;*/
DMA_Init(DMA2_Stream5, &DMA_InitStructure);

/* Enable the USART Rx DMA request */
USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
/* Enable the DMA RX Stream */
DMA_Cmd(DMA2_Stream5, ENABLE);
}

//USART1
void USART1_IRQHandler(void)
{

  u16 i;
flag=1;
  if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)////½óêÕÖD¶Ï
  {
DMA_Cmd(DMA2_Stream5, DISABLE);//1Ø±ÕUSART1 TX DMA1 ËùÖ¸ê¾μÄí¨μà
if(USART_GetFlagStatus(USART2,USART_FLAG_ORE)==SET)
{
USART_ClearFlag(USART1,USART_FLAG_ORE); //Ïè¶áSR
USART_ReceiveData(USART1); //Ôù¶áDR
}

USART1_Rec_Cnt= DMA_Rec_Len-DMA_GetCurrDataCounter(DMA2_Stream5);
USART1_Send(DMA_Rece_Buf,USART1_Rec_Cnt);
USART_ClearITPendingBit(USART1, USART_IT_IDLE|USART_IT_RXNE|USART_IT_TC); //Çå3yÖD¶Ï±êÖ¾
   //USART_ITConfig(USART1, USART_IT_IDLE , ENABLE);
/* Clear all DMA Streams flags */
DMA_ClearFlag(DMA2_Stream5, DMA_FLAG_HTIF2 | DMA_FLAG_TCIF2);

DMA_SetCurrDataCounter(DMA2_Stream5,DMA_Rec_Len);//DMAí¨μàμÄDMA»o′æμÄ′óD¡
DMA_Cmd(DMA2_Stream5, ENABLE);  //ê1ÄüUSART1 TX DMA1 ËùÖ¸ê¾μÄí¨μà

}
}
void NVIC_Configuration(void)
{
  NVIC_InitTypeDef NVIC_InitStructure;
  /*Enable DMA Interrupt
  NVIC_InitStructure.NVIC_IRQChannel = DMA2_Stream5_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);*/
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
  NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
  NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
  NVIC_Init(&NVIC_InitStructure);
}
/*éèÖÃê±Öó*/

void RCC_Configuration(void)
{
RCC_DeInit();

RCC_HSICmd(ENABLE);
while (RCC_GetFlagStatus(RCC_FLAG_HSIRDY) == RESET){}

RCC_HCLKConfig(RCC_SYSCLK_Div1);
RCC_PCLK1Config(RCC_HCLK_Div4);
RCC_PCLK2Config(RCC_HCLK_Div2);

FLASH_SetLatency(FLASH_Latency_7) ;
FLASH_PrefetchBufferCmd(ENABLE);

RCC_PLLConfig(RCC_PLLSource_HSI, 16, 240, 2, 5);

RCC_PLLCmd(ENABLE);
while (RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET){}
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOC, ENABLE);
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);
  RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2, ENABLE);
}

/*GPIOéèÖÃ*/

void GPIO_Configuration(void)
{
GPIO_InitTypeDef  GPIO_InitStructure;

GPIO_PinAFConfig(GPIOC, GPIO_PinSource6, GPIO_AF_USART1);
  GPIO_PinAFConfig(GPIOC, GPIO_PinSource7, GPIO_AF_USART1);

  GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
  GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //íÆíìêä3ö
  GPIO_InitStructure.GPIO_Speed = GPIO_Speed_100MHz;
  GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP ; //éÏà-êäèë

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_7 ;
  GPIO_Init(GPIOC, &GPIO_InitStructure);
}

/*USARTéèÖÃ*/

void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;

USART_InitStructure.USART_BaudRate = 115200;
  USART_InitStructure.USART_WordLength = USART_WordLength_8b;
  USART_InitStructure.USART_StopBits = USART_StopBits_1;
  USART_InitStructure.USART_Parity = USART_Parity_No;
  USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
  USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_ClearFlag(USART1, USART_FLAG_TC);
  USART_Init(USART1, &USART_InitStructure);
  USART_ITConfig(USART1, USART_IT_IDLE , ENABLE);
//USART_ITConfig(USART1, USART_IT_RXNE , ENABLE);
  USART_Cmd(USART1, ENABLE);
}
void USART1_Send(u8 *buf,u8 len)
{
u8 t;
    for(t=0;t<len;t++) //Ñ-»··￠Ëíêy¾Y
{
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
USART_SendData(USART1,buf[t]);
}
while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
}
void USART1_SendString(uint8_t *ch)
{
while(*ch!=0)
{
while(!USART_GetFlagStatus(USART1, USART_FLAG_TXE));
USART_SendData(USART1, *ch);
ch++;
}
}

void UART1_SendByte(uint16_t Data)
{
while (!(USART1->SR & USART_FLAG_TXE))
   {}
USART_SendData(USART1, Data);
}
收到的数据与发送的相差太大，求大神帮帮忙啊

正点原子 · 发表于 2016-3-17 22:56:41

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