F407板子 DMA接收串口数据问题-奔跑的蟑螂的回答

9条回答

2019-07-20 18:44

我把程序DMA初始化时的模式改成了循环模式DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;程序就正常了！！！真的郁闷了，虽然问题是解决了，但我还是不知道为什么。觉得问题是调用MYDMA_Enable(DMA2_Stream5,SEND_BUF_SIZE);这个函数的时候，DMA指针没有复位的原因。但如果是这样，那么为什么会没有复位。
MYDMA_Enable（）函数的实现：
void MYDMA_Enable(DMA_Stream_TypeDef *DMA_Streamx,u16 ndtr)
{
   DMA_Cmd(DMA_Streamx, DISABLE);                   //1Ø±ÕDMA′«êä
while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){} //è·±￡DMA¿éòÔ±»éèÖÃ
DMA_SetCurrDataCounter(DMA_Streamx,ndtr);       //êy¾Y′«êäá¿
DMA_Cmd(DMA_Streamx, ENABLE);                   //¿aÆôDMA′«êä
}

问题1：如果是DMA指针没有复位的问题，那么是为什么没有复位呢？
问题2：DMA的初始化的循环模式与普通模式到底有什么具体的区别。

[mw_shl_code=c,true]#include "sys.h"
#include "delay.h"
#include "usart.h"
#include "dma.h"

//ALIENTEK ì½Ë÷ÕßSTM32F407¿a·￠°å êμÑé23
//DMA êμÑé-¿aoˉêy°æ±¾
//¼¼êõÖ§3Ö￡owww.openedv.com
//ìÔ±|μêÆì￡ohttp://eboard.taobao.com
//1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾
//×÷Õß￡oÕyμãÔ-×ó @ALIENTEK

#define SEND_BUF_SIZE 200
extern u8 SendBuff[SEND_BUF_SIZE];

int main(void)
{
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);//éèÖÃÏμí3ÖD¶ÏóÅÏè¼¶·Ö×é2
delay_init(168);    //3õê¼»ˉÑóê±oˉêy
uart_init(115200); //3õê¼»ˉ′®¿ú2¨ìØÂêÎa115200
MYDMA_Config(DMA2_Stream5,DMA_Channel_4,(u32)&USART1->DR,(u32)SendBuff,SEND_BUF_SIZE);//DMA2,STEAM7,CH4,íaéèÎa′®¿ú1,′æ′￠Æ÷ÎaSendBuff,3¤¶èÎa:SEND_BUF_SIZE.
MYDMA_Enable(DMA2_Stream5,SEND_BUF_SIZE); //¿aÆôò»′ÎDMA′«êä

while(1);
}

[/mw_shl_code]

[mw_shl_code=c,true]#include "dma.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//ALIENTEK STM32F407¿a·￠°å
//DMA Çy¶ˉ′úÂë
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//′′½¨èÕÆú:2014/5/6
//°æ±¾￡oV1.0
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) 1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾ 2014-2024
//All rights reserved
//////////////////////////////////////////////////////////////////////////////////

//DMAxμÄ¸÷í¨μàÅäÖÃ
//ÕaàïμÄ′«êäDÎê½êÇ1ì¶¨μÄ,Õaμãòa¸ù¾Y2»í¬μÄÇé¿öà′DT¸Ä
//′ó′æ′￠Æ÷->íaéèÄ￡ê½/8Î»êy¾Y¿í¶è/′æ′￠Æ÷Ôöá¿Ä￡ê½
//DMA_Streamx

MAêy¾Yá÷,DMA1_Stream0~7/DMA2_Stream0~7
//chx

MAí¨μàÑ¡Ôñ,@ref DMA_channel DMA_Channel_0~DMA_Channel_7
//par:íaéèμØÖ·
//mar:′æ′￠Æ÷μØÖ·
//ndtr:êy¾Y′«êäá¿
void MYDMA_Config(DMA_Stream_TypeDef *DMA_Streamx,u32 chx,u32 par,u32 mar,u16 ndtr)
{

DMA_InitTypeDef  DMA_InitStructure;

if((u32)DMA_Streamx>(u32)DMA2)//μÃμ½μ±Ç°streamêÇêôóúDMA2»1êÇDMA1
{
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA2,ENABLE);//DMA2ê±Öóê1Äü

}else
{
   RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1,ENABLE);//DMA1ê±Öóê1Äü
}
  DMA_DeInit(DMA_Streamx);

while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){}//μè′yDMA¿éÅäÖÃ

  /* ÅäÖÃ DMA Stream */
  DMA_InitStructure.DMA_Channel = chx;  //í¨μàÑ¡Ôñ
  DMA_InitStructure.DMA_PeripheralBaseAddr = par;//DMAíaéèμØÖ·
  DMA_InitStructure.DMA_Memory0BaseAddr = mar;//DMA ′æ′￠Æ÷0μØÖ·
  DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;//íaéèμ½′æ′￠Æ÷Ä￡ê½
  DMA_InitStructure.DMA_BufferSize = ndtr;//êy¾Y′«êäá¿
  DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//íaéè·ÇÔöá¿Ä￡ê½
  DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;//′æ′￠Æ÷Ôöá¿Ä￡ê½
  DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//íaéèêy¾Y3¤¶è:8Î»
  DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;//′æ′￠Æ÷êy¾Y3¤¶è:8Î»
  DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;// ê1óÃÑ-»·Ä￡ê½￡¬2»¿é2éóÃÆÕí¨Ä￡ê½￡¬2»ÖaÎaoÎ
  DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;//ÖDμèóÅÏè¼¶
  DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
  DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
  DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;//′æ′￠Æ÷í»·￠μ￥′Î′«êä
  DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;//íaéèí»·￠μ￥′Î′«êä
  DMA_Init(DMA_Streamx, &DMA_InitStructure);//3õê¼»ˉDMA Stream

}
//¿aÆôò»′ÎDMA′«êä
//DMA_Streamx

MAêy¾Yá÷,DMA1_Stream0~7/DMA2_Stream0~7
//ndtr:êy¾Y′«êäá¿
void MYDMA_Enable(DMA_Stream_TypeDef *DMA_Streamx,u16 ndtr)
{

DMA_Cmd(DMA_Streamx, DISABLE);                   //1Ø±ÕDMA′«êä

while (DMA_GetCmdStatus(DMA_Streamx) != DISABLE){} //è·±￡DMA¿éòÔ±»éèÖÃ

DMA_SetCurrDataCounter(DMA_Streamx,ndtr);       //êy¾Y′«êäá¿

DMA_Cmd(DMA_Streamx, ENABLE);                   //¿aÆôDMA′«êä
}

[mw_shl_code=c,true]#include "sys.h"
#include "usart.h"
#include "dma.h"
#include "delay.h"
//////////////////////////////////////////////////////////////////////////////////
//èç1ûê1óÃucos,Ôò°üà¨ÏÂÃæμÄí·ÎÄ¼t¼′¿é.
#if SYSTEM_SUPPORT_OS
#include "includes.h" //ucos ê1óÃ
#endif

//////////////////////////////////////////////////////////////////////////////////
//±¾3ìDòÖ»1©Ñ§Ï°ê1óÃ￡¬Î′¾-×÷ÕßDí¿é￡¬2»μÃóÃóúÆäËüèÎoÎóÃí¾
//ALIENTEK STM32F4ì½Ë÷Õß¿a·￠°å
//′®¿ú13õê¼»ˉ
//ÕyμãÔ-×ó@ALIENTEK
//¼¼êõÂÛì3:www.openedv.com
//DT¸ÄèÕÆú:2014/6/10
//°æ±¾￡oV1.5
//°æè¨ËùóD￡¬μá°æ±Ø¾¿¡￡
//Copyright(C) 1ãÖYêDDÇòíμç×ó¿Æ¼¼óDÏT1«Ë¾ 2009-2019
//All rights reserved
//********************************************************************************
//V1.3DT¸ÄËμÃ÷
//Ö§3Öêêó|2»í¬ÆμÂêÏÂμÄ′®¿ú2¨ìØÂêéèÖÃ.
//¼óèëáË¶ÔprintfμÄÖ§3Ö
//Ôö¼óáË′®¿ú½óêÕÃüáî1|Äü.
//DTÕyáËprintfμúò»¸ö×Ö·û¶aê§μÄbug
//V1.4DT¸ÄËμÃ÷
//1,DT¸Ä′®¿ú3õê¼»ˉIOμÄbug
//2,DT¸ÄáËUSART_RX_STA,ê1μÃ′®¿ú×î′ó½óêÕ×Ö½úêyÎa2μÄ14′Î·½
//3,Ôö¼óáËUSART_REC_LEN,óÃóú¶¨òå′®¿ú×î′óÔêDí½óêÕμÄ×Ö½úêy(2»′óóú2μÄ14′Î·½)
//4,DT¸ÄáËEN_USART1_RXμÄê1Äü·½ê½
//V1.5DT¸ÄËμÃ÷
//1,Ôö¼óáË¶ÔUCOSIIμÄÖ§3Ö
//////////////////////////////////////////////////////////////////////////////////

#define SEND_BUF_SIZE 200 //·￠Ëíêy¾Y3¤¶è,×îoÃμèóúsizeof(TEXT_TO_SEND)+2μÄÕûêy±¶.

u8 SendBuff[SEND_BUF_SIZE]; //·￠Ëíêy¾Y»o3åÇø

//////////////////////////////////////////////////////////////////
//¼óèëòÔÏÂ′úÂë,Ö§3Öprintfoˉêy,¶ø2»DèòaÑ¡Ôñuse MicroLIB
#if 1
#pragma import(__use_no_semihosting)
//±ê×¼¿aDèòaμÄÖ§3Öoˉêy
struct __FILE
{
int handle;
};

FILE __stdout;
//¶¨òå_sys_exit()òÔ±üÃaê1óÃ°ëÖ÷»úÄ￡ê½
_sys_exit(int x)
{
x = x;
}
//ÖØ¶¨òåfputcoˉêy
int fputc(int ch, FILE *f)
{
while((USART1->SR&0X40)==0);//Ñ-»··￠Ëí,Ö±μ½·￠Ëííê±Ï
USART1->DR = (u8) ch;
return ch;
}
#endif

#if EN_USART1_RX //èç1ûê1ÄüáË½óêÕ

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);
}

//3õê¼»ˉIO ′®¿ú1
//bound:2¨ìØÂê
void uart_init(u32 bound){
//GPIO¶Ë¿úéèÖÃ
  GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOA,ENABLE); //ê1ÄüGPIOAê±Öó
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);//ê1ÄüUSART1ê±Öó

//′®¿ú1¶Ôó|òy½Å¸′óÃó3éä
GPIO_PinAFConfig(GPIOA,GPIO_PinSource9,GPIO_AF_USART1); //GPIOA9¸′óÃÎaUSART1
GPIO_PinAFConfig(GPIOA,GPIO_PinSource10,GPIO_AF_USART1); //GPIOA10¸′óÃÎaUSART1

//USART1¶Ë¿úÅäÖÃ
  GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9 | GPIO_Pin_10; //GPIOA9óëGPIOA10
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;//¸′óÃ1|Äü
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //Ëù¶è50MHz
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP; //íÆíì¸′óÃêä3ö
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP; //éÏà-
GPIO_Init(GPIOA,&GPIO_InitStructure); //3õê¼»ˉPA9￡&#172

A10

//USART1 3õê¼»ˉéèÖÃ
USART_InitStructure.USART_BaudRate = bound;//2¨ìØÂêéèÖÃ
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//×Ö3¤Îa8Î»êy¾Y¸ñê½
USART_InitStructure.USART_StopBits = USART_StopBits_1;//ò»¸öí￡Ö1Î»
USART_InitStructure.USART_Parity = USART_Parity_No;//ÎTÆæÅ¼D￡ÑéÎ»
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//ÎTó2¼têy¾Yá÷¿ØÖÆ
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //êÕ·￠Ä￡ê½
  USART_Init(USART1, &USART_InitStructure); //3õê¼»ˉ′®¿ú1

USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); //ê1Äü′®¿ú1 DMA½óêÕ
  USART_Cmd(USART1, ENABLE);  //ê1Äü′®¿ú1

//USART_ClearFlag(USART1, USART_FLAG_TC);

#if EN_USART1_RX
USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//¿aÆôÏà1ØÖD¶Ï

//Usart1 NVIC ÅäÖÃ
  NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;//′®¿ú1ÖD¶Ïí¨μà
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3;//ÇàÕ¼óÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelSubPriority =3; //×óóÅÏè¼¶3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQí¨μàê1Äü
NVIC_Init(&NVIC_InitStructure); //¸ù¾YÖ¸¶¨μÄ2Îêy3õê¼»ˉVIC¼Ä′æÆ÷¡￠

#endif

}

void USART1_IRQHandler(void)             //′®¿ú1ÖD¶Ï·tÎñ3ìDò
{
u8 Usart1_Rec_Cnt;
#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntEnter();
#endif

if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET)  //½óêÕÖD¶Ï(½óêÕμ½μÄêy¾Y±ØDëêÇ0x0d 0x0a½áÎ2)
{

   USART_ReceiveData(USART1);//¶áè¡êy¾Y ×￠òa￡oÕa¾ä±ØDëòa￡¬·ñÔò2»Äü1»Çå3yÖD¶Ï±êÖ¾Î»¡￡Îòò22»ÖaμàÎaé¶￡¡
   Usart1_Rec_Cnt = SEND_BUF_SIZE-DMA_GetCurrDataCounter(DMA2_Stream5); //Ëã3ö½ó±¾Ö¡êy¾Y3¤¶è

//***********Ö¡êy¾Y′|àíoˉêy************//
printf ("The lenght:%d ",Usart1_Rec_Cnt);
printf ("The data: ");
Usart1_Send(SendBuff,Usart1_Rec_Cnt);
printf (" Over! ");
//*************************************//
USART_ClearITPendingBit(USART1, USART_IT_IDLE);       //Çå3yÖD¶Ï±êÖ¾

// DMA_ClearFlag(DMA2_Stream5,DMA_FLAG_TCIF5);//Çå3yDMA2_Steam7′«êäíê3é±êÖ¾

// while(1)
// {
// if(DMA_GetFlagStatus(DMA2_Stream5,DMA_FLAG_TCIF5)!=RESET)//μè′yDMA2_Steam7′«êäíê3é
// {
// DMA_ClearFlag(DMA2_Stream5,DMA_FLAG_TCIF5);//Çå3yDMA2_Steam7′«êäíê3é±êÖ¾
// break;
// }
// }

MYDMA_Enable(DMA2_Stream5,SEND_BUF_SIZE); //»Ö¸′DMAÖ¸Õë￡¬μè′yÏÂò»′ÎμÄ½óêÕ
   }

#if SYSTEM_SUPPORT_OS //èç1ûSYSTEM_SUPPORT_OSÎaÕæ￡¬ÔòDèòaÖ§3ÖOS.
OSIntExit();
#endif
}
#endif

[/mw_shl_code]

[/mw_shl_code]

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