标准库实现USART8 DMA通信代码
时间: 2023-06-20 11:06:23 浏览: 67
下面是一个使用标准库实现USART8 DMA通信的示例代码:
```c
#include "stm32f4xx.h"
#include "stm32f4xx_dma.h"
#include "stm32f4xx_usart.h"
#define BUFF_SIZE 32
uint8_t TxBuffer[BUFF_SIZE] = "Hello, world!";
uint8_t RxBuffer[BUFF_SIZE];
void init_USART8(void)
{
GPIO_InitTypeDef GPIO_InitStructure;
USART_InitTypeDef USART_InitStructure;
DMA_InitTypeDef DMA_InitStructure;
/* Enable the USART8 and DMA1 clocks */
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_GPIOE, ENABLE);
RCC_APB1PeriphClockCmd(RCC_APB1Periph_UART8, ENABLE);
RCC_AHB1PeriphClockCmd(RCC_AHB1Periph_DMA1, ENABLE);
/* Configure GPIO pins for USART8 transmit and receive */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_1 | GPIO_Pin_0;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_UP;
GPIO_Init(GPIOE, &GPIO_InitStructure);
/* Connect USART8 pins to AF8 */
GPIO_PinAFConfig(GPIOE, GPIO_PinSource0, GPIO_AF_UART8);
GPIO_PinAFConfig(GPIOE, GPIO_PinSource1, GPIO_AF_UART8);
/* Configure USART8 */
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(UART8, &USART_InitStructure);
/* Configure DMA for USART8 transmit and receive */
DMA_InitStructure.DMA_Channel = DMA_Channel_5;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(UART8->DR);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)TxBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_MemoryToPeripheral;
DMA_InitStructure.DMA_BufferSize = BUFF_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_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream0, &DMA_InitStructure);
DMA_InitStructure.DMA_Channel = DMA_Channel_5;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&(UART8->DR);
DMA_InitStructure.DMA_Memory0BaseAddr = (uint32_t)RxBuffer;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = BUFF_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_FIFOMode = DMA_FIFOMode_Disable;
DMA_InitStructure.DMA_FIFOThreshold = DMA_FIFOThreshold_Full;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA1_Stream1, &DMA_InitStructure);
/* Enable USART8 and DMA1 */
USART_Cmd(UART8, ENABLE);
DMA_Cmd(DMA1_Stream0, ENABLE);
DMA_Cmd(DMA1_Stream1, ENABLE);
/* Enable DMA interrupts */
DMA_ITConfig(DMA1_Stream1, DMA_IT_TC, ENABLE);
/* Configure NVIC for DMA interrupts */
NVIC_InitTypeDef NVIC_InitStructure;
NVIC_InitStructure.NVIC_IRQChannel = DMA1_Stream1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
}
void DMA1_Stream1_IRQHandler(void)
{
if (DMA_GetITStatus(DMA1_Stream1, DMA_IT_TCIF1) != RESET)
{
/* Clear the DMA interrupt flag */
DMA_ClearITPendingBit(DMA1_Stream1, DMA_IT_TCIF1);
/* Handle the received data */
uint8_t ch;
for (int i = 0; i < BUFF_SIZE; i++)
{
ch = RxBuffer[i];
// do something with ch...
}
}
}
int main(void)
{
/* Initialize USART8 and DMA */
init_USART8();
/* Send data via DMA */
while (1)
{
DMA_Cmd(DMA1_Stream0, ENABLE);
while (DMA_GetFlagStatus(DMA1_Stream0, DMA_FLAG_TCIF0) == RESET)
;
DMA_Cmd(DMA1_Stream0, DISABLE);
/* Wait for a bit */
for (int i = 0; i < 1000000; i++)
;
}
}
```
这个示例中,我们使用USART8和DMA1来实现串口通信。我们配置了USART8的GPIO引脚,并启用了USART8和DMA1的时钟。然后,我们配置了USART8和DMA1的初始化参数,并使用标准库函数进行初始化。在主循环中,我们使用DMA发送数据,并在DMA传输完成后禁用DMA。我们还使用DMA接收数据,并在DMA传输完成后处理接收到的数据。我们使用一个简单的延时循环来模拟发送数据的间隔,并使用DMA中断处理接收数据。