stm32h743vet6 编写6主机口一从机口的 串口缓冲器
时间: 2024-02-29 22:51:27 浏览: 12
您可以参考以下步骤来编写 STM32H743VET6 的 6 主机口一从机口的串口缓冲器:
1. 首先需要确定串口的配置参数,包括波特率、数据位、校验位和停止位等;
2. 使能串口和 DMA,并设置 DMA 的传输模式为循环模式;
3. 定义缓冲区,可以使用数组或者环形缓冲器;
4. 在串口接收中断中,将接收到的数据存入缓冲区中;
5. 在主程序中,可以通过查询缓冲区中的数据来获取串口接收的数据;
6. 在需要发送数据时,将数据存入发送缓冲区,并启动 DMA 发送数据。
下面是一些代码示例,仅供参考:
```c
// 定义缓冲区
#define BUF_SIZE 256
uint8_t rx_buf[BUF_SIZE];
uint8_t tx_buf[BUF_SIZE];
uint16_t rx_index = 0;
uint16_t tx_index = 0;
void UART_Configuration(void)
{
// 配置串口
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);
// 配置 DMA
DMA_InitTypeDef DMA_InitStructure;
DMA_InitStructure.DMA_PeripheralBaseAddr = (uint32_t)&USART1->DR;
DMA_InitStructure.DMA_MemoryBaseAddr = (uint32_t)&rx_buf;
DMA_InitStructure.DMA_DIR = DMA_DIR_PeripheralToMemory;
DMA_InitStructure.DMA_BufferSize = BUF_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_HalfFull;
DMA_InitStructure.DMA_MemoryBurst = DMA_MemoryBurst_Single;
DMA_InitStructure.DMA_PeripheralBurst = DMA_PeripheralBurst_Single;
DMA_Init(DMA2_Stream2, &DMA_InitStructure);
// 使能 DMA 接收中断
DMA_ITConfig(DMA2_Stream2, DMA_IT_TC, ENABLE);
NVIC_EnableIRQ(DMA2_Stream2_IRQn);
// 使能串口和 DMA 接收
USART_Cmd(USART1, ENABLE);
USART_DMACmd(USART1, USART_DMAReq_Rx, ENABLE);
DMA_Cmd(DMA2_Stream2, ENABLE);
}
void DMA2_Stream2_IRQHandler(void)
{
if (DMA_GetITStatus(DMA2_Stream2, DMA_IT_TCIF2))
{
DMA_ClearITPendingBit(DMA2_Stream2, DMA_IT_TCIF2);
rx_index += BUF_SIZE;
if (rx_index >= BUF_SIZE * 2)
{
rx_index = 0;
}
}
}
uint16_t USART_GetRxCount(void)
{
uint16_t count = 0;
if (DMA2_Stream2->CR & DMA_SxCR_CT)
{
count = BUF_SIZE - DMA2_Stream2->NDTR;
}
else
{
count = BUF_SIZE * 2 - DMA2_Stream2->NDTR;
}
return count;
}
void USART_SendData(uint8_t *buffer, uint16_t length)
{
memcpy(tx_buf + tx_index, buffer, length);
tx_index += length;
DMA_Cmd(DMA2_Stream7, ENABLE);
}
void DMA2_Stream7_IRQHandler(void)
{
if (DMA_GetITStatus(DMA2_Stream7, DMA_IT_TCIF7))
{
DMA_ClearITPendingBit(DMA2_Stream7, DMA_IT_TCIF7);
tx_index = 0;
DMA_Cmd(DMA2_Stream7, DISABLE);
}
}
```
以上代码仅供参考,具体实现还需要根据您的具体需求来进行调整和完善。