STM32F103多個串口配置DMA程序(純代碼版詳解)

1、軟件：KeilMDK芯片：STM32F103/STM32F107串口數(shù)量：4備注：4個串口均配置為DMA讀取/串口1初始化函數(shù)void uart1_init(u32 bound) /GPIO端口設置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時

2、鐘USART_DeInit(USART1); /復位串口1/USART1_TX PA.9GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9; /PA.9GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;/復用推挽輸出GPIO_Init(GPIOA, &GPIO_InitStructure); /初始化PA9/USART1_RX PA.10GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;GP

3、IO_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=1 ;/搶占優(yōu)先級3NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;/子優(yōu)先級3NVIC_InitStruc

4、ture.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/*Enable DMA Channel4 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStruc

5、ture.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*Enable DMA Channel5 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel5_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_IRQChannelCmd =

6、 ENABLE;NVIC_Init(&NVIC_InitStructure);/USART 參數(shù)初始化設置USART_InitStructure.USART_BaudRate = bound;/一般設置為9600;USART_InitStructure.USART_WordLength = USART_WordLength_8b;/字長為8位數(shù)據(jù)格式USART_InitStructure.USART_StopBits = USART_StopBits_1;/一個停止位USART_InitStructure.USART_Parity = USART_Parity_No;/無奇偶校驗位USART_

7、InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;/無硬件數(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_RXNE, ENABLE);/開啟中斷USART_ITConfig(USART1, USART_IT_IDLE , ENABLE);/開

8、啟空閑中斷USART_Cmd(USART1, ENABLE); /使能串口 /串口2初始化函數(shù)void uart2_init(u32 bound)GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);/使能GPIOA時鐘RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART2,ENABLE);/

9、使能USART2時鐘GPIO_InitStructure.GPIO_Pin = GPIO_Pin_2;/PA2GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;/復用推挽GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOA, &GPIO_InitStructure);GPIO_InitStructure.GPIO_Pin = GPIO_Pin_3;/PA3GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING; /浮空輸入GP

10、IO_Init(GPIOA, &GPIO_InitStructure); RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,ENABLE);/復位串口2RCC_APB1PeriphResetCmd(RCC_APB1Periph_USART2,DISABLE);/停止復位USART_InitStructure.USART_BaudRate = bound;/一般設置為9600;USART_InitStructure.USART_WordLength = USART_WordLength_8b;/8位數(shù)據(jù)長度USART_InitStructure.USART

11、_StopBits = USART_StopBits_1;/一個停止位USART_InitStructure.USART_Parity = USART_Parity_No;/奇偶校驗位USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;/無硬件數(shù)據(jù)流控制USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;/收發(fā)模式USART_Init(USART2, &USART_InitStructure); ; /初始化串口NV

12、IC_InitStructure.NVIC_IRQChannel = USART2_IRQn; /使能串口2中斷NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1; /先占優(yōu)先級2級NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; /從優(yōu)先級2級NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; /使能外部中斷通道NVIC_Init(&NVIC_InitStructure); /根據(jù)NVIC_InitStruct中指定的參數(shù)初始化外設NV

13、IC寄存器/Enable DMA Channel7 Interrupt /NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel7_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 2;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*Enable DMA Channel6

14、Interrupt */NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel6_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/ USART_ITConfig(USART1, USART_IT_RXNE, ENABLE)

15、;/開啟中斷USART_ITConfig(USART2, USART_IT_IDLE , ENABLE);/開啟空閑中斷USART_Cmd(USART2, ENABLE); /使能串口 /串口3初始化函數(shù)void uart3_init(u32 bound) /GPIO端口設置GPIO_InitTypeDef GPIO_InitStructure;USART_InitTypeDef USART_InitStructure;NVIC_InitTypeDef NVIC_InitStructure;RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOB, ENABLE)

16、;/使能GPIOB時鐘RCC_APB1PeriphClockCmd(RCC_APB1Periph_USART3,ENABLE);/使能USART3時鐘USART_DeInit(USART3); /復位串口3/USART1_TX PB.10GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; /PB.10GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;/復用推挽輸出GPIO_Init(GPIOB, &GPIO_InitSt

17、ructure); /初始化PB.11/USART1_RX PB.11GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11;GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;/浮空輸入GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;GPIO_Init(GPIOB, &GPIO_InitStructure); /初始化PB/USART 初始化設置/#ifdef EN_USART3_RX /如果使能了接收USART_InitStructure.USART_Baud

18、Rate = bound;/一般設置為9600;USART_InitStructure.USART_WordLength = USART_WordLength_8b;/字長為8位數(shù)據(jù)格式USART_InitStructure.USART_StopBits = USART_StopBits_1;/一個停止位USART_InitStructure.USART_Parity = USART_Parity_No;/無奇偶校驗位USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;/無硬件數(shù)據(jù)流控制U

19、SART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;/收發(fā)模式USART_Init(USART3, &USART_InitStructure); /初始化串口/Usart1 NVIC 配置NVIC_InitStructure.NVIC_IRQChannel = USART3_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority=1;/搶占優(yōu)先級3NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;/子優(yōu)先級3NVI

20、C_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/ /*Enable DMA Channel2 Interrupt */ /NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel2_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1

21、;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/*Enable DMA Channel3 Interrupt */NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel3_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;NVIC_InitStructure.NVIC_

22、IRQChannelCmd = ENABLE;NVIC_Init(&NVIC_InitStructure);/ USART_ITConfig(USART3, USART_IT_RXNE, ENABLE);/開啟中斷USART_ITConfig(USART3, USART_IT_IDLE , ENABLE);/開啟空閑中斷USART_Cmd(USART3, ENABLE); /使能串口 /串口4初始化函數(shù)void uart4_init(u32 bound)GPIO_InitTypeDef GPIO_InitStructure; USART_InitTypeDef USART_InitStruct

23、ure;NVIC_InitTypeDef NVIC_InitStructure;DMA_InitTypeDef DMA_InitStructure; /定義DMA初始化結(jié)構(gòu)體DMA_InitStructure /NVIC_PriorityGroupConfig(NVIC_PriorityGroup_0); /選擇NVIC優(yōu)先級分組0 RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA2, ENABLE); RCC_APB2PeriphClockCmd(RCC_A

24、PB2Periph_GPIOC,ENABLE);/ 打開串口外設的時鐘RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART4, ENABLE);/串口4所使用管腳輸出輸入定義/定義UART4 Tx (PC.10)腳為復用推挽輸出GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10; /IO口的第2腳GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; /IO口速度GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP; /IO口復用推挽輸出GPIO_

25、Init(GPIOC, &GPIO_InitStructure); /初始化串口1輸出IO口/定義 UART4 Rx (PC.11)為懸空輸入 GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; /IO口的第3腳GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;/IO口懸空輸入GPIO_Init(GPIOC, &GPIO_InitStructure); /初始化串口1輸入IO口 /串口4參數(shù)初始化定義部分,串口1參數(shù)為9600 ， 8 ，1 ，N 接收中斷方式 USART_InitStructure.US

26、ART_BaudRate = bound; /設定傳輸速率USART_InitStructure.USART_WordLength = USART_WordLength_8b; /設定傳輸數(shù)據(jù)位數(shù)USART_InitStructure.USART_StopBits = USART_StopBits_1; /設定停止位個數(shù)USART_InitStructure.USART_Parity = USART_Parity_No ; /不用校驗位USART_InitStructure.USART_HardwareFlowControl = USART_HardwareFlowControl_None;/

27、不用流量控制USART_InitStructure.USART_Mode = USART_Mode_Rx | USART_Mode_Tx; /使用接收和發(fā)送功能USART_Init(UART4, &USART_InitStructure); /初始化串口4USART_ITConfig(UART4, USART_IT_IDLE,ENABLE); /使能串口4接收中斷USART_Cmd(UART4, ENABLE); /使能串口4USART_ClearFlag(UART4, USART_FLAG_TC); / 清標志(后增加) DMA_DeInit(DMA2_Channel3); /重置DMA 2

28、通道配置DMA_InitStructure.DMA_PeripheralBaseAddr = 0x40004C04; /外設地址 DMA_InitStructure.DMA_MemoryBaseAddr = (u32)USART4_RECEIVE_DATA; /內(nèi)存地址 DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; /外設作為數(shù)據(jù)目的地 DMA_InitStructure.DMA_BufferSize = 512; /DMA緩存大小:BufferSize DMA_InitStructure.DMA_PeripheralInc = DMA_

29、PeripheralInc_Disable; /外設地址寄存器不遞增 DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; /內(nèi)存地址寄存器遞增DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; /外設數(shù)據(jù)寬度為8位 DMA_InitStructure.DMA_MemoryDataSize = DMA_PeripheralDataSize_Byte; /內(nèi)存數(shù)據(jù)寬度為8位 DMA_InitStructure.DMA_Mode = DMA_Mode

30、_Circular; /工作在正常緩存模式 DMA_InitStructure.DMA_Priority = DMA_Priority_VeryHigh; /設置DMA通道優(yōu)先級為高 DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; /禁止DMA通道設置為內(nèi)存至內(nèi)存?zhèn)鬏?DMA_Init(DMA2_Channel3, &DMA_InitStructure); /初始化 DMA_ITConfig(DMA2_Channel3, DMA_IT_TC, ENABLE);DMA_ITConfig(DMA2_Channel3, DMA_IT_TE, ENABLE);

31、 USART_DMACmd(UART4, USART_DMAReq_Rx, ENABLE);DMA_Cmd(DMA2_Channel3, ENABLE);/使能串口4中斷NVIC_InitStructure.NVIC_IRQChannel = UART4_IRQn;NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 1;NVIC_InitStructure.NVIC_IRQChannelSubPriority = 1;NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;NVIC_Init(&NV

32、IC_InitStructure); NVIC_InitStructure.NVIC_IRQChannel = DMA2_Channel3_IRQn; NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 2; NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0; NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE; NVIC_Init(&NVIC_InitStructure);USART_Cmd(UART4, ENABLE);/DMA的配置void

33、 DMA_Configuration(void) DMA_InitTypeDef DMA_InitStructure; /* DMA clock enable */ RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);/DMA1/串口1 dma配置/ /* DMA1 Channel4 （串口1 TX) Config */ DMA_DeInit(DMA1_Channel4); DMA_InitStructure.DMA_PeripheralBaseAddr = 0x; DMA_InitStructure.DMA_MemoryBaseAddr = (

34、uint32_t)USART1_SEND_DATA; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 512; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralData

35、Size_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; /DMA工作模式DMA_Mode_Circular DMA_Mode_Normal DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel4, &DMA_InitStructu

36、re); DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE); DMA_ITConfig(DMA1_Channel4, DMA_IT_TE, ENABLE); /* Enable USART1 DMA TX request */ USART_DMACmd(USART1, USART_DMAReq_Tx, ENABLE); DMA_Cmd(DMA1_Channel4, DISABLE); /使能 /* DMA1 Channel5 (串口1 RX) Config */ DMA_DeInit(DMA1_Channel5); DMA_InitStructure

37、.DMA_PeripheralBaseAddr = 0x; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART1_RECEIVE_DATA; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 512; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_Memory

38、Inc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; /DMA工作模式DMA_Mode_Circular DMA_Mode_Normal DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitSt

39、ructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel5, &DMA_InitStructure); DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE); DMA_ITConfig(DMA1_Channel5, DMA_IT_TE, ENABLE); /* Enable USART1 DMA RX request */ USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE); DMA_Cmd(DMA1_Channel5, ENABLE); /使能/串口2 dm

40、a配置/ /* DMA1 Channel7 (串口2 TX) Config */ DMA_DeInit(DMA1_Channel7); DMA_InitStructure.DMA_PeripheralBaseAddr = 0x; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART2_SEND_DATA; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 512; DMA_InitStructure.DMA_Perip

41、heralInc = 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工作模式 DMA_Mode_Circul

42、ar DMA_Mode_Normal DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel7, &DMA_InitStructure); DMA_ITConfig(DMA1_Channel7, DMA_IT_TC, ENABLE); DMA_ITConfig(DMA1_Channel7, DMA_IT_TE, ENABLE); /* Enable USART1 DMA TX request */ USART_DM

43、ACmd(USART2, USART_DMAReq_Tx, ENABLE); DMA_Cmd(DMA1_Channel7, DISABLE); /使能 /* DMA1 Channel6 (串口2 RX) Config */ DMA_DeInit(DMA1_Channel6); DMA_InitStructure.DMA_PeripheralBaseAddr = 0x; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART2_RECEIVE_DATA; DMA_InitStructure.DMA_DIR = DMA_DIR_Peripher

44、alSRC; DMA_InitStructure.DMA_BufferSize = 512; 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_By

45、te; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; /DMA工作模式DMA_Mode_Circular DMA_Mode_Normal DMA_InitStructure.DMA_Priority = DMA_Priority_Medium; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel6, &DMA_InitStructure); DMA_ITConfig(DMA1_Channel6, DMA_IT_TC, ENABLE); DMA_ITConfig(D

46、MA1_Channel6, DMA_IT_TE, ENABLE); /* Enable USART2 DMA RX request */ USART_DMACmd(USART2, USART_DMAReq_Rx, ENABLE); DMA_Cmd(DMA1_Channel6, ENABLE); /使能/串口3 dma配置/ /* DMA1 Channel2 (串口3 TX) Config */ DMA_DeInit(DMA1_Channel2); DMA_InitStructure.DMA_PeripheralBaseAddr =0x; DMA_InitStructure.DMA_Memory

47、BaseAddr = (uint32_t)USART3_SEND_DATA; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST; DMA_InitStructure.DMA_BufferSize = 512; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_Pe

48、ripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Normal; /DMA工作模式 DMA_Mode_Circular DMA_Mode_Normal DMA_InitStructure.DMA_Priority = DMA_Priority_High; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel2, &DM

49、A_InitStructure); DMA_ITConfig(DMA1_Channel2, DMA_IT_TC, ENABLE); DMA_ITConfig(DMA1_Channel2, DMA_IT_TE, ENABLE); /* Enable USART1 DMA TX request */ USART_DMACmd(USART3, USART_DMAReq_Tx, ENABLE); DMA_Cmd(DMA1_Channel2, DISABLE); /使能 /* DMA1 Channel3 (串口3 RX) Config */ DMA_DeInit(DMA1_Channel3); DMA_

50、InitStructure.DMA_PeripheralBaseAddr = 0x; DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)USART3_RECEIVE_DATA; DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC; DMA_InitStructure.DMA_BufferSize = 512; DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable; DMA_InitStructure.DMA_MemoryInc

51、 = DMA_MemoryInc_Enable; DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_Byte; DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_Byte; DMA_InitStructure.DMA_Mode = DMA_Mode_Circular; /DMA工作模式DMA_Mode_Circular DMA_Mode_Normal DMA_InitStructure.DMA_Priority = DMA_Priority_Med

52、ium; DMA_InitStructure.DMA_M2M = DMA_M2M_Disable; DMA_Init(DMA1_Channel3, &DMA_InitStructure); DMA_ITConfig(DMA1_Channel3, DMA_IT_TC, ENABLE); DMA_ITConfig(DMA1_Channel3, DMA_IT_TE, ENABLE); /* Enable USART2 DMA RX request */ USART_DMACmd(USART3, USART_DMAReq_Rx, ENABLE); DMA_Cmd(DMA1_Channel3, ENABLE); /使能/使用DMA發(fā)數(shù)據(jù)中斷服務程序/void DMA1_Channel4_IRQHandler(void) DMA_ClearITPendingBit(DMA1_IT_TC4); DMA_ClearITPendingBit(DMA1_IT_TE4); DMA_Cmd(DMA1_Channel4, DISABLE);/關閉DMA USART1_TX_Fin