usart1 usart2 都采用dma方式发送，结果usart1的发送口烧毁两个，而且dma方式只能使其中一个生效，后边执行的生效

q2386736357 · 发表于 2015-4-13 06:16:58

volatile u8 Flag_Uart1_Send=0;
volatile u8 Flag_Uart2_Send=0;
char uart1senbuf[100];
char uart2senbuf[100];

//串口1DMA方式发送中断
void DMA1_Channel4_IRQHandler(void)
{
//清除标志位
DMA_ClearFlag(DMA1_FLAG_TC4);

//关闭DMA
DMA_Cmd(DMA1_Channel4,DISABLE);


//允许再次发送
Flag_Uart1_Send = 0;
}

//串口2DMA方式发送中断
void DMA1_Channel7_IRQHandler(void)
{
//清除标志位
DMA_ClearFlag(DMA1_FLAG_TC7);

//关闭DMA
DMA_Cmd(DMA1_Channel7,DISABLE);


//允许再次发送
Flag_Uart2_Send = 0;
}

////////////////////////////////////////////

void USART1_IRQHandler(void) //串口1中断服务程序
{

u8 Res;

if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
Res =USART_ReceiveData(USART1);//(USART1->DR); //读取接收到的数据

write_push(Res);

}

if(USART_GetFlagStatus(USART1,USART_FLAG_ORE)== SET)
{

Res =USART_ReceiveData(USART1); //读DR ,读得太慢，已经溢出
}

}

//初始化IO 串口1
//bound:波特率
void USART1_init( ){
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟
USART_DeInit(USART1); //复位串口1
//USART1_TX PA.9
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; //PA.9
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA9

//USART1_RX

A.10
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA10

//Usart1 NVIC 配置

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

//USART 初始化设置

USART_InitStructure.USART_BaudRate = 115200;//一般设置为9600;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收发模式

USART_Init(USART1, &USART_InitStructure); //初始化串口

USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);//开启中断

USART_Cmd(USART1, ENABLE); //使能串口




}

//////////////////////////////////////////////////////////////
#define KEY_H GPIOA->BSRR = GPIO_Pin_4
#define KEY_L GPIOA->BRR = GPIO_Pin_4

//初始化IO 串口2
//bound:波特率
void USART2_init( ){
//GPIO端口设置
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); //使能USART1，GPIOA时钟

RCC_APB1PeriphClockCmd( RCC_APB1Periph_USART2, ENABLE);

USART_DeInit(USART2); //复位串口1
//USART1_TX PA.2
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2; //PA.2
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; //复用推挽输出
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA2

//USART1_RX

A.3
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空输入
GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA3

//Usart1 NVIC 配置

NVIC_InitStructure.NVIC_IRQChannel = USART2_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器

//USART 初始化设置

USART_InitStructure.USART_BaudRate = 38400;//一般设置为38400;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx; //收发模式

USART_Init(USART2, &USART_InitStructure); //初始化串口
USART_ITConfig(USART2, USART_IT_RXNE, ENABLE);//开启中断
USART_Cmd(USART2, ENABLE); //使能串口






GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 ;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);




}

void USART2_setBaud( int band){

USART_InitTypeDef USART_InitStructure;

USART_Cmd(USART2, DISABLE);

USART_InitStructure.USART_BaudRate = band;//一般设置为38400;
USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字长为8位数据格式
USART_InitStructure.USART_StopBits = USART_StopBits_1;//一个停止位
USART_InitStructure.USART_Parity = USART_Parity_No;//无奇偶校验位
USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;//无硬件数据流控制
USART_InitStructure.USART_Mode = USART_Mode_Tx|USART_Mode_Rx; //收发模式

USART_Init(USART2, &USART_InitStructure); //初始化串口

USART_Cmd(USART2, ENABLE); //使能串口







}

void USART2_IRQHandler(void) //串口1中断服务程序
{

u8 Res;



if(USART_GetITStatus(USART2, USART_IT_RXNE) != RESET) //接收中断(接收到的数据必须是0x0d 0x0a结尾)
{
USART_ClearITPendingBit(USART2,USART_IT_RXNE);
Res =USART_ReceiveData(USART2);//(USART1->DR); //读取接收到的数据

if( at_flag == 1)
{
if( at_wire_len <199)
{
at_wire_buff[at_wire_len++]=Res;
}
else
{
at_wire_buff[at_wire_len]=0;
}



}
else
{
wirewrite_push( Res);

}






}

if(USART_GetFlagStatus(USART2,USART_FLAG_ORE)== SET)
{

Res =USART_ReceiveData(USART2); //读DR ,读得太慢，已经溢出
}

}

void usart1_send( char sdnd[],int len)
{
/*
int i;
USART_ClearFlag(USART1,USART_FLAG_TC);

for(i=0;i<len;i++)
{
USART_SendData(USART1,sdnd);

while(USART_GetFlagStatus(USART1,USART_FLAG_TC) == RESET );

}
*/


Flag_Uart1_Send=1;
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); //使能串口1的DMA发送
MYDMA1_Enable(DMA1_Channel4,len);//开始一次DMA传输！
//等待DMA传输完成，此时我们来做另外一些事，点灯
//实际应用中，传输数据期间，可以执行另外的任务



}

void usart2_send( char sdnd[],int len)
{

/* int i;
USART_ClearFlag(USART2,USART_FLAG_TC);

for(i=0;i<len;i++)
{
USART_SendData(USART2,sdnd);

while(USART_GetFlagStatus(USART2,USART_FLAG_TC) == RESET );

}

return ;
*/

Flag_Uart2_Send=1;
USART_DMACmd(USART2, USART_DMAReq_Tx, ENABLE); //使能串口1的DMA发送
MYDMA2_Enable(DMA1_Channel7,len);//开始一次DMA传输！
//等待DMA传输完成，此时我们来做另外一些事，点灯
//实际应用中，传输数据期间，可以执行另外的任务


}

void MYDMA1_Config(DMA_Channel_TypeDef* DMA_CHx,u32 cpar,u32 cmar,u16 cndtr)
{

NVIC_InitTypeDef NVIC_InitStructure;


RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA传输

DMA_DeInit(DMA_CHx); //将DMA的通道1寄存器重设为缺省值

DMA_InitStructure.DMA_PeripheralBaseAddr = cpar; //DMA外设ADC基地址
DMA_InitStructure.DMA_MemoryBaseAddr = cmar; //DMA内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外设作为数据传输的目的地
DMA_InitStructure.DMA_BufferSize = cndtr; //DMA通道的DMA缓存的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //数据宽度为8位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //数据宽度为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA通道 x拥有中优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x没有设置为内存到内存传输
DMA_Init(DMA_CHx, &DMA_InitStructure); //根据DMA_InitStruct中指定的参数初始化DMA的通道USART1_Tx_DMA_Channel所标识的寄存器


DMA_ITConfig(DMA1_Channel4,DMA_IT_TC,ENABLE);


NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器






}
//开启一次DMA传输
void MYDMA1_Enable(DMA_Channel_TypeDef*DMA_CHx,u8 len)
{
DMA_Cmd(DMA_CHx, DISABLE ); //关闭USART1 TX DMA1 所指示的通道
DMA_InitStructure.DMA_BufferSize = len;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
DMA_Cmd(DMA_CHx, ENABLE); //使能USART1 TX DMA1 所指示的通道
}

void MYDMA2_Config(DMA_Channel_TypeDef* DMA_CHx,u32 cpar,u32 cmar,u16 cndtr)
{

NVIC_InitTypeDef NVIC_InitStructure;


RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA传输

DMA_DeInit(DMA_CHx); //将DMA的通道1寄存器重设为缺省值

DMA_InitStructure.DMA_PeripheralBaseAddr = cpar; //DMA外设ADC基地址
DMA_InitStructure.DMA_MemoryBaseAddr = cmar; //DMA内存基地址
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; //外设作为数据传输的目的地
DMA_InitStructure.DMA_BufferSize = cndtr; //DMA通道的DMA缓存的大小
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外设地址寄存器不变
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //内存地址寄存器递增
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //数据宽度为8位
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //数据宽度为8位
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常缓存模式
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA通道 x拥有中优先级
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x没有设置为内存到内存传输
DMA_Init(DMA_CHx, &DMA_InitStructure); //根据DMA_InitStruct中指定的参数初始化DMA的通道USART1_Tx_DMA_Channel所标识的寄存器




DMA_ITConfig(DMA1_Channel7,DMA_IT_TC,ENABLE);


NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//抢占优先级3
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; //子优先级3
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能
NVIC_Init(&NVIC_InitStructure); //根据指定的参数初始化VIC寄存器




}
//开启一次DMA传输
void MYDMA2_Enable(DMA_Channel_TypeDef*DMA_CHx,u8 len)
{
DMA_Cmd(DMA_CHx, DISABLE ); //关闭USART1 TX DMA1 所指示的通道
DMA_InitStructure.DMA_BufferSize = len;
DMA_Init(DMA1_Channel7, &DMA_InitStructure);
DMA_Cmd(DMA_CHx, ENABLE); //使能USART1 TX DMA1 所指示的通道
}

int SendData(char *buf,int len )
{

if (len >90)
{
return 0;
}
int nsend=0;


uart1senbuf[0]=0xAA;
uart1senbuf[1]=0x55;
uart1senbuf[2]=len;


uart1senbuf[3+len]=checksum(&uart1senbuf[2],len+1);

usart1_send( uart1senbuf,4+len);



}

int wireSendData(char *buf,int len )
{

if (len >90)
{
return 0;
}
int nsend=0;


uart2senbuf[0]=0xAA;
uart2senbuf[1]=0x55;
uart2senbuf[2]=len;


uart2senbuf[3+len]=checksum(&uart2senbuf[2],len+1);

usart2_send( uart2senbuf,4+len);



}

int main(void)
{
u8 highspeed=0;

u8 sendsum=0;

u8 isblue=0; //0表示在，1，表示错误，需要断电模块。


Demo_Init();
NVIC_Configuration();

SysTick_Config(7200); //配置SYSTICK时钟节拍为0.1ms一次





USART1_init( );

USART2_init( );



MYDMA2_Config(DMA1_Channel7,(u32)&USART2->DR,(u32)uart2senbuf,100);//DMA1通道7,外设为串口2

MYDMA1_Config(DMA1_Channel4,(u32)&USART1->DR,(u32)uart1senbuf,100);//DMA1通道4,外设为串口1


while(1)
{


if(Flag_Uart1_Send ==0 )
{


u8 speed;

int lensend=10 ;
if(lensend> 0 )
{
SendData(uart1senbuf,lensend);
}

}




highdelay_ms(1500);

if(Flag_Uart2_Send ==0 )
{


u8 speed;

int lensend=10 ;
if(lensend> 0 )
{
wireSendData(uart2senbuf,lensend);
}

}




highdelay_ms(1500);

}


}

以上为全部代码

MYDMA2_Config(DMA1_Channel7,(u32)&USART2->DR,(u32)uart2senbuf,100);//DMA1通道7,外设为串口2

MYDMA1_Config(DMA1_Channel4,(u32)&USART1->DR,(u32)uart1senbuf,100);//DMA1通道4,外设为串口1

这两个哪个放在后边，那个串口发送生效。
请问如何使usart1,usart2同时起作用。

q2386736357 · 发表于 2015-4-13 18:53:33

版主，请问这是什么问题，感觉代码没错，就是

MYDMA1_Config(DMA1_Channel4,(u32)&USART1->DR,(u32)uart1senbuf,100);//DMA1通道4,外设为串口1

MYDMA2_Config(DMA1_Channel7,(u32)&USART2->DR,(u32)uart2senbuf,100);//DMA1通道7,外设为串口2

这么写，usart1 就发不出去了，但是都可以进入dma发送中断