STM32 DMA 串口透?jìng)?/h1>
一直沒(méi)有好好的搗鼓過(guò)ＤＭＡ,在調(diào)BLE項(xiàng)目的時(shí)候，遇到了DMA串口傳輸?shù)膯?wèn)題，傷心流涕甚長(zhǎng)時(shí)間!!!DMA 網(wǎng)上的解釋一大堆，簡(jiǎn)單總結(jié)一下：
本文引用地址：http://www.biyoush.com/article/201611/318108.htmDMA處理過(guò)程全部是由硬件來(lái)實(shí)現(xiàn)的，速度很快！
DMA在專門的DMA控制下，實(shí)現(xiàn)高速外設(shè)與主存儲(chǔ)期之間自動(dòng)成批量的數(shù)據(jù)交換。
通常有兩種交換方式：1獨(dú)占總線方式 2周期挪用方式
DMA傳送過(guò)程
DMA預(yù)處理
DMA數(shù)據(jù)傳送
DMA結(jié)束處理將總線控制權(quán)交換給CPU
DMA內(nèi)部寄存器
地址寄存器：存放DMA傳輸是儲(chǔ)存單元地址
字節(jié)寄存器：存放DMA傳輸字節(jié)數(shù)
控制寄存器：存放CPU設(shè)定的DMA傳輸方式
狀態(tài)寄存器：存放DMAC當(dāng)前的狀態(tài)
DMA外設(shè)地址：基地址+偏移地址
兩種方法設(shè)定地址：
#defineUSART1_DR_Base 0x40013804
#defineUSART1_DR_Base (&(USART1->DR)) 覺(jué)得還是第二種方法比較直接
DMA兩種中斷觸發(fā)方式：
DMA_IT_TC1傳輸完成中斷：每次更新發(fā)生在計(jì)數(shù)>=設(shè)定值
DMA_IT_HT1傳輸過(guò)半中斷：每次更新發(fā)生在計(jì)數(shù)>（設(shè)定值/2）
DMA_IT_GL1全局中斷：（實(shí)驗(yàn)了幾次和過(guò)半中斷傳輸情況一致）
編程的時(shí)候根據(jù)DMA請(qǐng)求映像來(lái)判斷通道號(hào)，然后找到目的地址和原地址基本上就算完事兒了。當(dāng)然得分清是傳輸是外設(shè)和內(nèi)存，內(nèi)存和外設(shè)，內(nèi)存和內(nèi)存三種情況，會(huì)有 （DMA_InitTypeDef 結(jié)構(gòu)體).DMA_M2M 進(jìn)行設(shè)置。
下面是DMA串口收發(fā)簡(jiǎn)單例子，并沒(méi)有用到FIFO精確收發(fā)，有時(shí)間再好好寫(xiě)寫(xiě)~
DMA_Configuration（）是DMA5通道 串口1接收通道配置函數(shù)
DMA_Configuration2（）是DMA4通道 串口1發(fā)送通道配置函數(shù)
對(duì)于發(fā)送 可以每當(dāng)發(fā)送的時(shí)候 都執(zhí)行DMA_Configuration2（），進(jìn)行發(fā)送操作
對(duì)于接收 理應(yīng)采用FIFO,對(duì)于接收數(shù)組進(jìn)行處理，這里只是簡(jiǎn)單的接收，沒(méi)有進(jìn)一步處理
/* Includes ------------------------------------------------------------------*/#include "stm32f10x.h"#include "stm32f10x_tim.h" #include "stm32f10x_rcc.h"#include "stm32f10x_map.h" #include "stm32f10x_it.h" #include "misc.h" #include "bsp_timer.h"#include "stm32f10x_usart.h"#include "stm32f10x_dma.h"#include "stdio.h"#define SENDBUFF_SIZE 10vu8 SendBuff[SENDBUFF_SIZE]={0};vu8 TxBuffer[] = "hello xiao lei !!! ";vu8 NbrOfDataToTransfer = sizeof(TxBuffer)-1;GPIO_InitTypeDef GPIO_InitStructure;#define LED1_ON GPIO_SetBits(GPIOB, GPIO_Pin_5); #define LED1_OFF GPIO_ResetBits(GPIOB, GPIO_Pin_5); #define LED2_ON GPIO_SetBits(GPIOD, GPIO_Pin_6); #define LED2_OFF GPIO_ResetBits(GPIOD, GPIO_Pin_6); #define LED3_ON GPIO_SetBits(GPIOD, GPIO_Pin_3); #define LED3_OFF GPIO_ResetBits(GPIOD, GPIO_Pin_3); void RCC_Configuration(void);void LED_Config(void);void Delay(__IO uint32_t nCount);int fputc(int ch, FILE *f){USART_SendData(USART1, (u8) ch);while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET){}return ch;}/* 名 稱：void LED_Config(void)* 功 能：LED 控制初始化函數(shù)* 入口參數(shù)：無(wú)* 出口參數(shù)：無(wú)* 說(shuō) 明：* 調(diào)用方法：無(wú) / void LED_Config(void){RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD , ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //LED1 V6 //將V6,V7,V8 配置為通用推挽輸出 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //口線翻轉(zhuǎn)速度為50MHzGPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_3; //LED2, LED3 V7 V8GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOD, &GPIO_InitStructure);GPIO_Init(GPIOD, &GPIO_InitStructure);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //LCD背光控制GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOD, &GPIO_InitStructure);GPIO_ResetBits(GPIOD, GPIO_Pin_13); //LCD背光關(guān)閉 }void USART1_Configration(){USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);//USART1_TXGPIO_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_RXGPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_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_Cmd(USART1, ENABLE);}void DMA_Configuration(void){DMA_InitTypeDef DMA_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸DMA_DeInit(DMA1_Channel5);DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&(USART1->DR));DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外設(shè)作源頭//外設(shè)是作為數(shù)據(jù)傳輸?shù)哪康牡剡€是來(lái)源DMA_InitStructure.DMA_BufferSize = 5; //DMA緩存的大小 單位在下邊設(shè)定DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址寄存器不遞增DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址遞增DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外設(shè)字節(jié)為單位DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //內(nèi)存字節(jié)為單位DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //工作在循環(huán)緩存模式DMA_InitStructure.DMA_Priority = DMA_Priority_High; //4優(yōu)先級(jí)之一的(高優(yōu)先) VeryHigh/High/Medium/LowDMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非內(nèi)存到內(nèi)存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1寄存器DMA_ITConfig(DMA1_Channel5, DMA_IT_HT, ENABLE); //DMA5半傳輸完成中斷USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); //使能USART1的接收DMA請(qǐng)求DMA_Cmd(DMA1_Channel5, ENABLE); DMA_ClearFlag(DMA1_FLAG_TC5); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}void DMA_Configuration2(void){DMA_InitTypeDef DMA_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸DMA_DeInit(DMA1_Channel4);DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&(USART1->DR));DMA_InitStructure.DMA_MemoryBaseAddr = (u32)TxBuffer;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST ; //外設(shè)作源頭//外設(shè)是作為數(shù)據(jù)傳輸?shù)哪康牡剡€是來(lái)源DMA_InitStructure.DMA_BufferSize = NbrOfDataToTransfer; //DMA緩存的大小 單位在下邊設(shè)定DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址寄存器不遞增DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址遞增DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外設(shè)字節(jié)為單位DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //內(nèi)存字節(jié)為單位DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ; //工作在循環(huán)緩存模式DMA_InitStructure.DMA_Priority = DMA_Priority_High; //4優(yōu)先級(jí)之一的(高優(yōu)先) VeryHigh/High/Medium/LowDMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //內(nèi)存到非內(nèi)存DMA_Init(DMA1_Channel4, &DMA_InitStructure); //根據(jù)DMA_InitStruct中指定的參數(shù)初始化DMA的通道1寄存器DMA_ITConfig(DMA1_Channel4, DMA_IT_TC , ENABLE); //DMA4傳輸完成中斷USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE); //使能USART1的發(fā)送DMA請(qǐng)求DMA_Cmd(DMA1_Channel4, ENABLE); DMA_ClearFlag(DMA1_FLAG_TC4); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}/* 名 稱：int main(void)* 功 能：主函數(shù)* 入口參數(shù)：無(wú)* 出口參數(shù)：無(wú)* 說(shuō) 明：* 調(diào)用方法：無(wú) / int main(void){int i,j;RCC_Configuration(); //系統(tǒng)時(shí)鐘配置//TIM3_Configuration();NVIC_Configuration(); LED_Config(); USART1_Configration();DMA_Configuration(); //DMA_Configuration2();//LED控制配置// printf("Start DMA transmission!rn");//LED1_ON ;for(i=0;i<1000000;i++);// for(j=0;j<20;j++); DMA_Configuration2();while (1){}}/* 名 稱：void RCC_Configuration(void)* 功 能：系統(tǒng)時(shí)鐘配置為72MHZ* 入口參數(shù)：無(wú)* 出口參數(shù)：無(wú)* 說(shuō) 明：* 調(diào)用方法：無(wú) / void RCC_Configuration(void){ SystemInit();}void DMA1_Channel5_IRQHandler(void){u8 end;int i; printf("Start DMA transmission!rn");/ 全傳輸完成*/// if(DMA_GetITStatus(DMA1_IT_TC5))// { // end = DMA_GetCurrDataCounter(DMA1_Channel5);// DMA_ClearITPendingBit(DMA1_IT_GL5);///* 清中斷源// DMA_ClearFlag(DMA1_FLAG_TC5); // // printf("AA%dAA:", end);// printf("%srn", SendBuff);// for(i=0;i<100000;i++); // }/// 半傳輸完成*/if(DMA_GetITStatus(DMA1_FLAG_HT5)){ end = DMA_GetCurrDataCounter(DMA1_Channel5);DMA_ClearITPendingBit(DMA1_IT_GL5);///* 清中斷源DMA_ClearFlag(DMA1_IT_TC5); printf("AA%dAA:", end);printf("%srn", SendBuff);for(i=0;i<100000;i++); }//}void DMA1_Channel4_IRQHandler(void){if(DMA_GetITStatus(DMA1_IT_TC4)==SET){DMA_ClearFlag(DMA1_IT_TC4);//TCIE,TE,RE printf("AAAA!");}}
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DMA 網(wǎng)上的解釋一大堆，簡(jiǎn)單總結(jié)一下：
本文引用地址：http://www.biyoush.com/article/201611/318108.htmDMA處理過(guò)程全部是由硬件來(lái)實(shí)現(xiàn)的，速度很快！
DMA在專門的DMA控制下，實(shí)現(xiàn)高速外設(shè)與主存儲(chǔ)期之間自動(dòng)成批量的數(shù)據(jù)交換。
通常有兩種交換方式：1獨(dú)占總線方式 2周期挪用方式
DMA傳送過(guò)程
DMA預(yù)處理
DMA數(shù)據(jù)傳送
DMA結(jié)束處理將總線控制權(quán)交換給CPU
DMA內(nèi)部寄存器
地址寄存器：存放DMA傳輸是儲(chǔ)存單元地址
字節(jié)寄存器：存放DMA傳輸字節(jié)數(shù)
控制寄存器：存放CPU設(shè)定的DMA傳輸方式
狀態(tài)寄存器：存放DMAC當(dāng)前的狀態(tài)
DMA外設(shè)地址：基地址+偏移地址
兩種方法設(shè)定地址：
#defineUSART1_DR_Base 0x40013804
#defineUSART1_DR_Base (&(USART1->DR)) 覺(jué)得還是第二種方法比較直接
DMA兩種中斷觸發(fā)方式：
DMA_IT_TC1傳輸完成中斷：每次更新發(fā)生在計(jì)數(shù)>=設(shè)定值
DMA_IT_HT1傳輸過(guò)半中斷：每次更新發(fā)生在計(jì)數(shù)>（設(shè)定值/2）
DMA_IT_GL1全局中斷：（實(shí)驗(yàn)了幾次和過(guò)半中斷傳輸情況一致）
編程的時(shí)候根據(jù)DMA請(qǐng)求映像來(lái)判斷通道號(hào)，然后找到目的地址和原地址基本上就算完事兒了。當(dāng)然得分清是傳輸是外設(shè)和內(nèi)存，內(nèi)存和外設(shè)，內(nèi)存和內(nèi)存三種情況，會(huì)有 （DMA_InitTypeDef 結(jié)構(gòu)體).DMA_M2M 進(jìn)行設(shè)置。
下面是DMA串口收發(fā)簡(jiǎn)單例子，并沒(méi)有用到FIFO精確收發(fā)，有時(shí)間再好好寫(xiě)寫(xiě)~
DMA_Configuration（）是DMA5通道 串口1接收通道配置函數(shù)
DMA_Configuration2（）是DMA4通道 串口1發(fā)送通道配置函數(shù)
對(duì)于發(fā)送 可以每當(dāng)發(fā)送的時(shí)候 都執(zhí)行DMA_Configuration2（），進(jìn)行發(fā)送操作
對(duì)于接收 理應(yīng)采用FIFO,對(duì)于接收數(shù)組進(jìn)行處理，這里只是簡(jiǎn)單的接收，沒(méi)有進(jìn)一步處理
/* Includes ------------------------------------------------------------------*/#include "stm32f10x.h"#include "stm32f10x_tim.h" #include "stm32f10x_rcc.h"#include "stm32f10x_map.h" #include "stm32f10x_it.h" #include "misc.h" #include "bsp_timer.h"#include "stm32f10x_usart.h"#include "stm32f10x_dma.h"#include "stdio.h"#define SENDBUFF_SIZE 10vu8 SendBuff[SENDBUFF_SIZE]={0};vu8 TxBuffer[] = "hello xiao lei !!! ";vu8 NbrOfDataToTransfer = sizeof(TxBuffer)-1;GPIO_InitTypeDef GPIO_InitStructure;#define LED1_ON GPIO_SetBits(GPIOB, GPIO_Pin_5); #define LED1_OFF GPIO_ResetBits(GPIOB, GPIO_Pin_5); #define LED2_ON GPIO_SetBits(GPIOD, GPIO_Pin_6); #define LED2_OFF GPIO_ResetBits(GPIOD, GPIO_Pin_6); #define LED3_ON GPIO_SetBits(GPIOD, GPIO_Pin_3); #define LED3_OFF GPIO_ResetBits(GPIOD, GPIO_Pin_3); void RCC_Configuration(void);void LED_Config(void);void Delay(__IO uint32_t nCount);int fputc(int ch, FILE *f){USART_SendData(USART1, (u8) ch);while(USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET){}return ch;}/* 名 稱：void LED_Config(void)* 功 能：LED 控制初始化函數(shù)* 入口參數(shù)：無(wú)* 出口參數(shù)：無(wú)* 說(shuō) 明：* 調(diào)用方法：無(wú) / void LED_Config(void){RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB | RCC_APB2Periph_GPIOD , ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_5; //LED1 V6 //將V6,V7,V8 配置為通用推挽輸出 GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; //口線翻轉(zhuǎn)速度為50MHzGPIO_Init(GPIOB, &GPIO_InitStructure); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_6|GPIO_Pin_3; //LED2, LED3 V7 V8GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOD, &GPIO_InitStructure);GPIO_Init(GPIOD, &GPIO_InitStructure);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_13; //LCD背光控制GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP;GPIO_Init(GPIOD, &GPIO_InitStructure);GPIO_ResetBits(GPIOD, GPIO_Pin_13); //LCD背光關(guān)閉 }void USART1_Configration(){USART_InitTypeDef USART_InitStructure; GPIO_InitTypeDef GPIO_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA | RCC_APB2Periph_USART1, ENABLE);//USART1_TXGPIO_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_RXGPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;GPIO_Init(GPIOA, &GPIO_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_Cmd(USART1, ENABLE);}void DMA_Configuration(void){DMA_InitTypeDef DMA_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸DMA_DeInit(DMA1_Channel5);DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&(USART1->DR));DMA_InitStructure.DMA_MemoryBaseAddr = (u32)SendBuff;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; //外設(shè)作源頭//外設(shè)是作為數(shù)據(jù)傳輸?shù)哪康牡剡€是來(lái)源DMA_InitStructure.DMA_BufferSize = 5; //DMA緩存的大小 單位在下邊設(shè)定DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址寄存器不遞增DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址遞增DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外設(shè)字節(jié)為單位DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //內(nèi)存字節(jié)為單位DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; //工作在循環(huán)緩存模式DMA_InitStructure.DMA_Priority = DMA_Priority_High; //4優(yōu)先級(jí)之一的(高優(yōu)先) VeryHigh/High/Medium/LowDMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //非內(nèi)存到內(nèi)存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1寄存器DMA_ITConfig(DMA1_Channel5, DMA_IT_HT, ENABLE); //DMA5半傳輸完成中斷USART_DMACmd(USART1,USART_DMAReq_Rx,ENABLE); //使能USART1的接收DMA請(qǐng)求DMA_Cmd(DMA1_Channel5, ENABLE); DMA_ClearFlag(DMA1_FLAG_TC5); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}void DMA_Configuration2(void){DMA_InitTypeDef DMA_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE); //使能DMA傳輸DMA_DeInit(DMA1_Channel4);DMA_InitStructure.DMA_PeripheralBaseAddr = (u32)(&(USART1->DR));DMA_InitStructure.DMA_MemoryBaseAddr = (u32)TxBuffer;DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST ; //外設(shè)作源頭//外設(shè)是作為數(shù)據(jù)傳輸?shù)哪康牡剡€是來(lái)源DMA_InitStructure.DMA_BufferSize = NbrOfDataToTransfer; //DMA緩存的大小 單位在下邊設(shè)定DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; //外設(shè)地址寄存器不遞增DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; //內(nèi)存地址遞增DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; //外設(shè)字節(jié)為單位DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; //內(nèi)存字節(jié)為單位DMA_InitStructure.DMA_Mode = DMA_Mode_Normal ; //工作在循環(huán)緩存模式DMA_InitStructure.DMA_Priority = DMA_Priority_High; //4優(yōu)先級(jí)之一的(高優(yōu)先) VeryHigh/High/Medium/LowDMA_InitStructure.DMA_M2M = DMA_M2M_Disable; //內(nèi)存到非內(nèi)存DMA_Init(DMA1_Channel4, &DMA_InitStructure); //根據(jù)DMA_InitStruct中指定的參數(shù)初始化DMA的通道1寄存器DMA_ITConfig(DMA1_Channel4, DMA_IT_TC , ENABLE); //DMA4傳輸完成中斷USART_DMACmd(USART1,USART_DMAReq_Tx,ENABLE); //使能USART1的發(fā)送DMA請(qǐng)求DMA_Cmd(DMA1_Channel4, ENABLE); DMA_ClearFlag(DMA1_FLAG_TC4); NVIC_PriorityGroupConfig(NVIC_PriorityGroup_2); NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);}/* 名 稱：int main(void)* 功 能：主函數(shù)* 入口參數(shù)：無(wú)* 出口參數(shù)：無(wú)* 說(shuō) 明：* 調(diào)用方法：無(wú) / int main(void){int i,j;RCC_Configuration(); //系統(tǒng)時(shí)鐘配置//TIM3_Configuration();NVIC_Configuration(); LED_Config(); USART1_Configration();DMA_Configuration(); //DMA_Configuration2();//LED控制配置// printf("Start DMA transmission!rn");//LED1_ON ;for(i=0;i<1000000;i++);// for(j=0;j<20;j++); DMA_Configuration2();while (1){}}/* 名 稱：void RCC_Configuration(void)* 功 能：系統(tǒng)時(shí)鐘配置為72MHZ* 入口參數(shù)：無(wú)* 出口參數(shù)：無(wú)* 說(shuō) 明：* 調(diào)用方法：無(wú) / void RCC_Configuration(void){ SystemInit();}void DMA1_Channel5_IRQHandler(void){u8 end;int i; printf("Start DMA transmission!rn");/ 全傳輸完成*/// if(DMA_GetITStatus(DMA1_IT_TC5))// { // end = DMA_GetCurrDataCounter(DMA1_Channel5);// DMA_ClearITPendingBit(DMA1_IT_GL5);///* 清中斷源// DMA_ClearFlag(DMA1_FLAG_TC5); // // printf("AA%dAA:", end);// printf("%srn", SendBuff);// for(i=0;i<100000;i++); // }/// 半傳輸完成*/if(DMA_GetITStatus(DMA1_FLAG_HT5)){ end = DMA_GetCurrDataCounter(DMA1_Channel5);DMA_ClearITPendingBit(DMA1_IT_GL5);///* 清中斷源DMA_ClearFlag(DMA1_IT_TC5); printf("AA%dAA:", end);printf("%srn", SendBuff);for(i=0;i<100000;i++); }//}void DMA1_Channel4_IRQHandler(void){if(DMA_GetITStatus(DMA1_IT_TC4)==SET){DMA_ClearFlag(DMA1_IT_TC4);//TCIE,TE,RE printf("AAAA!");}}
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