DMA mtp

一、 结构体配置

void DMA_mtp_Config(void)
{
	DMA_InitTypeDef DMA_InitStructure;								
	
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

	DMA_InitStructure.DMA_PeripheralBaseAddr = USART_DR_addr;	    //USART地址
	DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SendBuff;	    //储存器地址
	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;		    //传输方向
	//DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
	
	DMA_InitStructure.DMA_BufferSize = 5;					//传输数目
	DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;        //外设地址增量模式
	DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;			//储存器地址增量模式
	DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte;         //储存器数据宽度（串口只能为8位）同外设一致

	DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//外设数据宽度
	DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;				//传输模式 只传输一次
	DMA_InitStructure.DMA_Priority = DMA_Priority_High;			//通道优先级
	DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;				//MtoM模式
	
	DMA_Init(DMA1_Channel4, &DMA_InitStructure);

	DMA_Cmd(DMA1_Channel4, ENABLE);
	

二、程序源码

dma_mtp.c

#include "dma_mtp.h"


uint8_t SendBuff[5]={1,2,3,4,5};

void USART_config(void)																	//串口初始化配置函数
{
	
	GPIO_InitTypeDef GPIO_InitStructure;					//定义GPIO初始化结构体
	USART_InitTypeDef USART_InitStructure;					//定义GPIO初始化结构体
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA,ENABLE);	//打开GPIO时钟
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;				//选择串口接收引脚
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;	//浮空输入
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	
	GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;				//选择串口发送引脚
	GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;				//复用推挽输出
	GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;			//输出速率
	GPIO_Init(GPIOA,&GPIO_InitStructure);
	
	RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1,ENABLE);	//开启串口1时钟
	USART_InitStructure.USART_BaudRate = 115200;					//设置串口波比特率
	USART_InitStructure.USART_StopBits =USART_StopBits_1 ;//停止位
	USART_InitStructure.USART_Parity =USART_Parity_No;		//校验位  
	USART_InitStructure.USART_WordLength =USART_WordLength_8b ;//数据位
	USART_InitStructure.USART_Mode =USART_Mode_Rx|USART_Mode_Tx;//选择串口模式
	USART_InitStructure.USART_HardwareFlowControl =USART_HardwareFlowControl_None;//配置硬件控制流
	USART_Init(USART1, &USART_InitStructure);
	
	//NVIC_Configuration();																	//调用中断控制函数
	
	//USART_ITConfig(USART1,USART_IT_RXNE,ENABLE);					//串口接收使能
	
	USART_Cmd(USART1, ENABLE);														//串口使能
	
}

void DMA_mtp_Config(void)
{
	DMA_InitTypeDef DMA_InitStructure;								
	
	RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);

	DMA_InitStructure.DMA_PeripheralBaseAddr = USART_DR_addr;			//USART地址
	DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)SendBuff;		//储存器地址
	DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;			//传输方向
	//DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
	
	DMA_InitStructure.DMA_BufferSize = 5;							//传输数目
	DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;//外设地址增量模式
	DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;					//储存器地址增量模式
	DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; //储存器数据宽度（串口只能为8位）同外设一致
	
	DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte;//外设数据宽度
	DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ;						//传输模式 只传输一次
	DMA_InitStructure.DMA_Priority = DMA_Priority_High;					//通道优先级
	DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;						//MtoM模式
	
	DMA_Init(DMA1_Channel4, &DMA_InitStructure);

	DMA_Cmd(DMA1_Channel4, ENABLE);
	
}

dma_mtp.h

#ifndef __DMA_MTP_H
#define __DMA_MTP_H
#include "stm32f10x.h"
#include <stdio.h>

#define USART_DR_addr    (USART1_BASE+0X04)     //外设寄存器地址

void DMA_mtp_Config(void);
void USART_config(void);

#endif  //__DMA_MTM_H

main.c

#include "stm32f10x.h"   // 相当于51单片机中的  #include <reg51.h>
#include "bsp_led.h"
#include "dma_mtp.h"

extern uint8_t SendBuff[5];                //声明外部文件变量

int main(void)
{
	USART_config();                                //串口初始化
	
	USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE);    //DMA使能
	DMA_mtp_Config();                                //DMA初始化

	while(1);

}