DMA_USART1通信收发不正常
#include "stm32f2xx.h"#include <stdio.h>
#define USART1_DR_ADDRESS ((uint32_t)USART1 + 0x04)
#define DMA_Rec_Len 32
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;
int16_t USART1_Rec_Cnt=0;
int main(void)
{
//int16_t j;
uint8_t i;
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
DMA_Configuration();
NVIC_Configuration();
while (1)
{
}
void DMA_Configuration(void)
{
DMA_InitTypeDefDMA_InitStructure;
DMA_DeInit(DMA2_Stream5);
DMA_InitStructure.DMA_Channel = DMA_Channel_4;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_ADDRESS;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)DMA_Rece_Buf;
DMA_InitStructure.DMA_BufferSize = DMA_Rec_Len;
DMA_Init(DMA2_Stream5, &DMA_InitStructure);
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_VeryHigh;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_Init(DMA2_Stream5, &DMA_InitStructure);
USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
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);//1رÕUSART1 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);
//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);
DMA_Cmd(DMA2_Stream5, ENABLE);
}
}
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_InitTypeDefGPIO_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);
}
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++;
}
}
收到的数据与发送的相差太大，求大神帮帮忙啊
是么意思，是单次相差大，还是总数
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
以上大小更改为byte，
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
更改为Normal试试看。
另：建议不要再接收中断中立即发送数据!!!
祝你好运... 如楼上所说，中断中收发数据导致数据丢失。 中断收还是可以的，就是发的有问题了，，哪有，建议你把发的放在中断外进行发送
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