STM32的DMA演示，USART

#include "stm32f10x_lib.h"
#include"stdio.h"


#define USART1_DR_Base0x40013804


#define SENDBUFF_SIZE10240
vu8 SendBuff[SENDBUFF_SIZE];
vu8 RecvBuff[10];
vu8 recv_ptr;

void RCC_Configuration(void);
void GPIO_Configuration(void);
void NVIC_Configuration(void);
void DMA_Configuration(void);
void USART1_Configuration(void);
int fputc(int ch, FILE *f);
void Delay(void);


int main(void)
{
u16 i;
#ifdef DEBUG
debug();
#endif
recv_ptr = 0;
RCC_Configuration();
GPIO_Configuration();
NVIC_Configuration();
DMA_Configuration();
USART1_Configuration();
printf("rnSystem Start...rn");
printf("Initialling SendBuff... rn");
for(i=0;i{
SendBuff[i] = i&0xff;
}
printf("Initial success!rnWaiting for transmission...rn");
//發(fā)送去數(shù)據(jù)已經(jīng)準(zhǔn)備好，按下按鍵即開始傳輸
while(GPIO_ReadInputDataBit(GPIOD, GPIO_Pin_3));
printf("Start DMA transmission!rn");
//這里是開始DMA傳輸前的一些準(zhǔn)備工作，將USART1模塊設(shè)置成DMA方式工作
USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE);
//開始一次DMA傳輸！
DMA_Cmd(DMA1_Channel4, ENABLE);
//等待DMA傳輸完成，此時(shí)我們來做另外一些事，點(diǎn)燈
//實(shí)際應(yīng)用中，傳輸數(shù)據(jù)期間，可以執(zhí)行另外的任務(wù)
while(DMA_GetFlagStatus(DMA1_FLAG_TC4) == RESET)
{
LED_1_REV;//LED翻轉(zhuǎn)
Delay();//浪費(fèi)時(shí)間
}
//DMA傳輸結(jié)束后，自動(dòng)關(guān)閉了DMA通道，而無需手動(dòng)關(guān)閉
//下面的語句被注釋
//DMA_Cmd(DMA1_Channel4, DISABLE);
printf("rnDMA transmission successful!rn");

while (1)
{
}
}

int fputc(int ch, FILE *f)
{
//USART_SendData(USART1, (u8) ch);
USART1->DR = (u8) ch;

while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET)
{
}
return ch;
}

void Delay(void)
{
u32 i;
for(i=0;i<0xF0000;i++);
return;
}

void RCC_Configuration(void)
{
ErrorStatus HSEStartUpStatus;
//使能外部晶振
RCC_HSEConfig(RCC_HSE_ON);
//等待外部晶振穩(wěn)定
HSEStartUpStatus = RCC_WaitForHSEStartUp();
//如果外部晶振啟動(dòng)成功，則進(jìn)行下一步操作
if(HSEStartUpStatus==SUCCESS)
{
//設(shè)置HCLK（AHB時(shí)鐘）=SYSCLK
RCC_HCLKConfig(RCC_SYSCLK_Div1);
//PCLK1(APB1) = HCLK/2
RCC_PCLK1Config(RCC_HCLK_Div2);
//PCLK2(APB2) = HCLK
RCC_PCLK2Config(RCC_HCLK_Div1);
//FLASH時(shí)序控制
//推薦值：SYSCLK = 0~24MHzLatency=0
//SYSCLK = 24~48MHzLatency=1
//SYSCLK = 48~72MHzLatency=2
FLASH_SetLatency(FLASH_Latency_2);
//開啟FLASH預(yù)取指功能
FLASH_PrefetchBufferCmd(FLASH_PrefetchBuffer_Enable);
//PLL設(shè)置 SYSCLK/1 * 9 = 8*1*9 = 72MHz
RCC_PLLConfig(RCC_PLLSource_HSE_Div1, RCC_PLLMul_9);
//啟動(dòng)PLL
RCC_PLLCmd(ENABLE);
//等待PLL穩(wěn)定
while(RCC_GetFlagStatus(RCC_FLAG_PLLRDY) == RESET);
//系統(tǒng)時(shí)鐘SYSCLK來自PLL輸出
RCC_SYSCLKConfig(RCC_SYSCLKSource_PLLCLK);
//切換時(shí)鐘后等待系統(tǒng)時(shí)鐘穩(wěn)定
while(RCC_GetSYSCLKSource()!=0x08);

}
//下面是給各模塊開啟時(shí)鐘
//啟動(dòng)GPIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_GPIOB |
RCC_APB2Periph_GPIOC | RCC_APB2Periph_GPIOD,
ENABLE);
//啟動(dòng)AFIO
RCC_APB2PeriphClockCmd(RCC_APB2Periph_AFIO, ENABLE);
//啟動(dòng)USART1
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
//啟動(dòng)DMA時(shí)鐘
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}

void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
//PC口4567腳設(shè)置GPIO輸出，推挽 2M
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_4 | GPIO_Pin_5 | GPIO_Pin_6 | GPIO_Pin_7;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
GPIO_Init(GPIOC, &GPIO_InitStructure);
//KEY2 KEY3 JOYKEY
//位于PD口的3 4 11-15腳，使能設(shè)置為輸入
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3 | GPIO_Pin_4 | GPIO_Pin_11 | GPIO_Pin_12 |
GPIO_Pin_13 | GPIO_Pin_14 | GPIO_Pin_15;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOD, &GPIO_InitStructure);
//USART1_TX
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_Init(GPIOA, &GPIO_InitStructure);
//USART1_RX
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}

void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
#ifdefVECT_TAB_RAM
// Set the Vector Table base location at 0x20000000
NVIC_SetVectorTable(NVIC_VectTab_RAM, 0x0);
#else
// Set the Vector Table base location at 0x08000000
NVIC_SetVectorTable(NVIC_VectTab_FLASH, 0x0);
#endif
//設(shè)置NVIC優(yōu)先級分組為Group2：0-3搶占式優(yōu)先級，0-3的響應(yīng)式優(yōu)先級
NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2);
//串口接收中斷打開
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQChannel;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}

void USART1_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 9600;
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_Tx | USART_Mode_Rx;
USART_Init(USART1, &USART_InitStructure);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
USART_Cmd(USART1, ENABLE);
}
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
//DMA設(shè)置：
//設(shè)置DMA源：內(nèi)存地址&串口數(shù)據(jù)寄存器地址
//方向：內(nèi)存-->外設(shè)
//每次傳輸位：8bit
//傳輸大小DMA_BufferSize=SENDBUFF_SIZE
//地址自增模式：外設(shè)地址不增，內(nèi)存地址自增1
//DMA模式：一次傳輸，非循環(huán)
//優(yōu)先級：中
DMA_DeInit(DMA1_Channel4);
DMA_InitStructure.DMA_PeripheralBaseAddr = USART1_DR_Base;
DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = SENDBUFF_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;
DMA_InitStructure.DMA_Mode = DMA_Mode_Normal;
DMA_InitStructure.DMA_Priority = DMA_Priority_Medium;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
}