void uart_init(u32 bound);

void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx);

#endif

usart.C

//初始化IO 串口1

//bound:波特率

void uart_init(u32 bound)

{

//GPIO端口設(shè)置

GPIO_InitTypeDef GPIO_InitStructure;

USART_InitTypeDef USART_InitStructure;

NVIC_InitTypeDef NVIC_InitStructure;

DMA_InitTypeDef DMA_InitStructure;

RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1|RCC_APB2Periph_GPIOA,ENABLE); //使能USART1，GPIOA時(shí)鐘

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

RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);//使能USART2時(shí)鐘

USART_DeInit(USART1); //復(fù)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; //復(fù)用推挽輸出

GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA9

//USART1_RX PA.10

GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;

GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;//浮空輸入

GPIO_Init(GPIOA, &GPIO_InitStructure); //初始化PA10

//Usart1 NVIC 配置

NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;

NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=3 ;//搶占優(yōu)先級(jí)3

NVIC_InitStructure.NVIC_IRQChannelSubPriority = 3; //子優(yōu)先級(jí)3

NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; //IRQ通道使能

NVIC_Init(&NVIC_InitStructure); //根據(jù)指定的參數(shù)初始化VIC寄存器

//USART 初始化設(shè)置

USART_InitStructure.USART_BaudRate = bound;

USART_InitStructure.USART_WordLength = USART_WordLength_8b;//字長(zhǎng)為8位數(shù)據(jù)格式

USART_InitStructure.USART_StopBits = USART_StopBits_1;//一個(gè)停止位

USART_InitStructure.USART_Parity = USART_Parity_No;//無(wú)奇偶校驗(yàn)位

USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;//無(wú)硬件數(shù)據(jù)流控制

USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; //收發(fā)模式

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

USART_ITConfig(USART1, USART_IT_IDLE, ENABLE);//開(kāi)啟空閑中斷

USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); //使能串口1 DMA接收

USART_Cmd(USART1, ENABLE); //使能串口

//相應(yīng)的DMA配置

DMA_DeInit(DMA1_Channel5); //將DMA的通道5寄存器重設(shè)為缺省值 串口1對(duì)應(yīng)的是DMA通道5

DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)&USART1->DR; //DMA外設(shè)usart基地址

DMA_InitStructure.DMA_MemoryBaseAddr = (u32)DMA_Rece_Buf; //DMA內(nèi)存基地址

DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //數(shù)據(jù)傳輸方向，從外設(shè)讀取發(fā)送到內(nèi)存

DMA_InitStructure.DMA_BufferSize = DMA_Rec_Len; //DMA通道的DMA緩存的大小

DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址寄存器不變

DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址寄存器遞增

DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //數(shù)據(jù)寬度為8位

DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //數(shù)據(jù)寬度為8位

DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; //工作在正常緩存模式

DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; //DMA通道 x擁有中優(yōu)先級(jí)

DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //DMA通道x沒(méi)有設(shè)置為內(nèi)存到內(nèi)存?zhèn)鬏?/p>

DMA_Init(DMA1_Channel5, &DMA_InitStructure); //根據(jù)DMA_InitStruct中指定的參數(shù)初始化DMA的通道

DMA_Cmd(DMA1_Channel5, ENABLE); //正式驅(qū)動(dòng)DMA傳輸

}

//重新恢復(fù)DMA指針

void MYDMA_Enable(DMA_Channel_TypeDef*DMA_CHx)

{

DMA_Cmd(DMA_CHx, DISABLE ); //關(guān)閉USART1 TX DMA1所指示的通道

DMA_SetCurrDataCounter(DMA_CHx,DMA_Rec_Len);//DMA通道的DMA緩存的大小

DMA_Cmd(DMA_CHx, ENABLE); //打開(kāi)USART1 TX DMA1所指示的通道

}

//發(fā)送len個(gè)字節(jié)

//buf:發(fā)送區(qū)首地址

//len:發(fā)送的字節(jié)數(shù)

void Usart1_Send(u8 *buf,u8 len)

{

u8 t;

for(t=0;t<len;t++) //循環(huán)發(fā)送數(shù)據(jù)

{

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

USART_SendData(USART1,buf[t]);

}

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

}

//串口中斷函數(shù)

void USART1_IRQHandler(void) //串口1中斷服務(wù)程序

{

if(USART_GetITStatus(USART1, USART_IT_IDLE) != RESET) //接收中斷(接收到的數(shù)據(jù)必須是0x0d 0x0a結(jié)尾)

{

USART_ReceiveData(USART1);//讀取數(shù)據(jù)注意：這句必須要，否則不能夠清除中斷標(biāo)志位。

Usart1_Rec_Cnt =DMA_Rec_Len-DMA_GetCurrDataCounter(DMA1_Channel5); //算出接本幀數(shù)據(jù)長(zhǎng)度

//***********幀數(shù)據(jù)處理函數(shù)************//

printf ("Thelenght:%d\r\n",Usart1_Rec_Cnt);

printf ("The data:\r\n");

Usart1_Send(DMA_Rece_Buf,Usart1_Rec_Cnt);

printf ("\r\nOver! \r\n");

//*************************************//

USART_ClearITPendingBit(USART1,USART_IT_IDLE); //清除中斷標(biāo)志

MYDMA_Enable(DMA1_Channel5); //恢復(fù)DMA指針，等待下一次的接收

}

}