DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
时间: 2024-06-17 16:07:04 浏览: 8
DMA_ITConfig函数是一个STM32内核中的DMA库函数,它用于配置DMA通道中传输完成(Transfer Complete)中断的开关控制。其第一个参数为DMA通道号,第二个参数为中断类型,第三个参数为开关控制(ENABLE或DISABLE)。在本例中,该函数的作用是使DMA1通道5在传输完成时触发中断,并使该中断被开启。这意味着当DMA1通道5完成数据传输时,该中断将被触发并执行相应的中断处理程序。需要注意的是,开启中断后还需要相应的中断处理函数来实现具体的功能。
相关问题
用STM32F4的库函数写通过DMA_GetCurrentMemoryTarget函数判断DMA中断里面需要处理双缓冲哪一组数据
以下是用STM32F4的库函数写通过DMA_GetCurrentMemoryTarget函数判断DMA中断里面需要处理双缓冲哪一组数据的示例代码:
```c
#include "stm32f4xx.h"
#define BUFFER_SIZE 256
uint16_t buffer1[BUFFER_SIZE];
uint16_t buffer2[BUFFER_SIZE];
DMA_InitTypeDef DMA_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
void init_DMA(void)
{
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
DMA_InitStructure.DMA_Channel = DMA_Channel_0;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&ADC1->DR;
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)buffer1;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = BUFFER_SIZE;
DMA_InitStructure.DMA_PeripheralInc = DMA_PeripheralInc_Disable;
DMA_InitStructure.DMA_MemoryInc = DMA_MemoryInc_Enable;
DMA_InitStructure.DMA_PeripheralDataSize = DMA_PeripheralDataSize_HalfWord;
DMA_InitStructure.DMA_MemoryDataSize = DMA_MemoryDataSize_HalfWord;
DMA_InitStructure.DMA_Mode = DMA_Mode_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream0, &DMA_InitStructure);
DMA_ITConfig(DMA1_Stream0, DMA_IT_TC, ENABLE);
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream0_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
DMA_Cmd(DMA1_Stream0, ENABLE);
}
void DMA1_Stream0_IRQHandler(void)
{
if (DMA_GetITStatus(DMA1_Stream0, DMA_IT_TCIF0))
{
DMA_ClearITPendingBit(DMA1_Stream0, DMA_IT_TCIF0);
if (DMA_GetCurrentMemoryTarget(DMA1_Stream0) == 0)
{
// Process buffer1
}
else
{
// Process buffer2
}
}
}
int main(void)
{
init_DMA();
while (1)
{
// Main program loop
}
}
```
在这个示例代码中,首先定义了两个缓冲区`buffer1`和`buffer2`,并且使用DMA将ADC1的数据传输到这两个缓冲区中。在DMA中断里面,使用`DMA_GetCurrentMemoryTarget`函数判断当前需要处理的是哪一个缓冲区,然后进行相应的处理。
需要注意的是,在初始化DMA的时候,要将`DMA_Mode`设置为`DMA_Mode_Circular`,这样才能实现双缓冲的功能。另外,在使用`DMA_GetCurrentMemoryTarget`函数之前,要确保DMA已经传输了至少一次数据,否则该函数会返回错误的结果。
stm32f103 usart1 使用dma中断接收发送实现
下面是使用DMA中断实现STM32F103 USART1接收和发送的示例代码:
```c
#include "stm32f10x.h"
#define USART1_DR_Address 0x40013804
#define BUFFER_SIZE 256
uint8_t RxBuffer[BUFFER_SIZE];
uint8_t TxBuffer[BUFFER_SIZE];
volatile uint16_t RxCounter = 0;
volatile uint16_t TxCounter = 0;
volatile uint8_t RxComplete = 0;
volatile uint8_t TxComplete = 0;
void RCC_Configuration(void)
{
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);
RCC_AHBPeriphClockCmd(RCC_AHBPeriph_DMA1, ENABLE);
}
void GPIO_Configuration(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
}
void USART_Configuration(void)
{
USART_InitTypeDef USART_InitStructure;
USART_InitStructure.USART_BaudRate = 115200;
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_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStructure);
USART_Cmd(USART1, ENABLE);
}
void DMA_Configuration(void)
{
DMA_InitTypeDef DMA_InitStructure;
DMA_DeInit(DMA1_Channel4);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)USART1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)RxBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralSRC;
DMA_InitStructure.DMA_BufferSize = BUFFER_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_Circular;
DMA_InitStructure.DMA_Priority = DMA_Priority_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel4, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel4, DMA_IT_TC, ENABLE);
DMA_DeInit(DMA1_Channel5);
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)USART1_DR_Address;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)TxBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralDST;
DMA_InitStructure.DMA_BufferSize = BUFFER_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_High;
DMA_InitStructure.DMA_M2M = DMA_M2M_Disable;
DMA_Init(DMA1_Channel5, &DMA_InitStructure);
DMA_ITConfig(DMA1_Channel5, DMA_IT_TC, ENABLE);
}
void NVIC_Configuration(void)
{
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Channel4_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
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 DMA1_Channel4_IRQHandler(void)
{
if (DMA_GetITStatus(DMA1_IT_TC4) == SET) {
DMA_ClearITPendingBit(DMA1_IT_TC4);
RxComplete = 1;
}
}
void DMA1_Channel5_IRQHandler(void)
{
if (DMA_GetITStatus(DMA1_IT_TC5) == SET) {
DMA_ClearITPendingBit(DMA1_IT_TC5);
TxComplete = 1;
}
}
void USART1_DMA_Send(uint8_t* buffer, uint16_t size)
{
while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
DMA_Cmd(DMA1_Channel5, DISABLE);
while (DMA_GetCmdStatus(DMA1_Channel5) == ENABLE);
DMA_SetCurrDataCounter(DMA1_Channel5, size);
DMA_MemoryTargetConfig(DMA1_Channel5, (uint32_t) buffer, DMA_Memory_0);
DMA_Cmd(DMA1_Channel5, ENABLE);
}
void USART1_DMA_Receive(uint8_t* buffer, uint16_t size)
{
DMA_Cmd(DMA1_Channel4, DISABLE);
while (DMA_GetCmdStatus(DMA1_Channel4) == ENABLE);
DMA_SetCurrDataCounter(DMA1_Channel4, size);
DMA_MemoryTargetConfig(DMA1_Channel4, (uint32_t) buffer, DMA_Memory_0);
DMA_Cmd(DMA1_Channel4, ENABLE);
}
int main(void)
{
RCC_Configuration();
GPIO_Configuration();
USART_Configuration();
DMA_Configuration();
NVIC_Configuration();
USART1_DMA_Receive(RxBuffer, BUFFER_SIZE);
while (1) {
if (RxComplete) {
RxComplete = 0;
RxCounter = BUFFER_SIZE - DMA_GetCurrDataCounter(DMA1_Channel4);
// 处理接收到的数据
// ...
USART1_DMA_Send(TxBuffer, TxCounter);
}
if (TxComplete) {
TxComplete = 0;
TxCounter = 0;
// 发送完成
}
}
}
```
代码中使用了DMA的循环模式,接收和发送缓冲区大小均为256字节,可以根据需要进行修改。接收完成后会触发DMA中断,处理接收到的数据并发送响应数据。发送完成后会触发DMA中断,可以进行下一次发送。
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