stm32使用环形队列实现串口收发
时间: 2023-09-12 10:03:35 浏览: 240
使用环形队列实现串口收发,可以有效地解决数据丢失、串口阻塞等问题。下面是一个基于STM32的环形队列串口收发的实现示例:
首先,定义一个环形队列结构体:
```
typedef struct{
uint8_t *buffer; // 数据缓冲区
uint16_t head; // 队头指针
uint16_t tail; // 队尾指针
uint16_t size; // 队列大小
} RingBuffer_t;
```
然后,在串口中断回调函数中,将接收到的数据放入环形队列中:
```
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
static uint8_t data;
if(huart->Instance == USARTx){
data = (uint8_t)(huart->Instance->DR & (uint8_t)0x00FF);
if(RingBuffer_Write(&rxBuffer, &data, 1) != 1){
// 队列已满,处理溢出情况
}
HAL_UART_Receive_IT(&huart, &data, 1); // 重新开启接收中断
}
}
```
在发送函数中,从队列中读取数据发送:
```
void UART_SendData(UART_HandleTypeDef *huart, uint8_t *pData, uint16_t size)
{
uint16_t i;
for(i = 0; i < size; i++){
while(RingBuffer_IsEmpty(&txBuffer)); // 等待队列非空
RingBuffer_Read(&txBuffer, pData + i, 1);
}
HAL_UART_Transmit_IT(huart, pData, size); // 发送数据
}
```
最后,实现环形队列的读写操作:
```
int RingBuffer_Write(RingBuffer_t *buffer, uint8_t *data, uint16_t size)
{
uint16_t i;
for(i = 0; i < size; i++){
if(RingBuffer_IsFull(buffer)){
return i; // 队列已满,返回写入的字节数
}
buffer->buffer[buffer->head] = data[i];
buffer->head = (buffer->head + 1) % buffer->size;
}
return i; // 返回写入的字节数
}
int RingBuffer_Read(RingBuffer_t *buffer, uint8_t *data, uint16_t size)
{
uint16_t i;
for(i = 0; i < size; i++){
if(RingBuffer_IsEmpty(buffer)){
return i; // 队列已空,返回读取的字节数
}
data[i] = buffer->buffer[buffer->tail];
buffer->tail = (buffer->tail + 1) % buffer->size;
}
return i; // 返回读取的字节数
}
int RingBuffer_IsFull(RingBuffer_t *buffer)
{
return ((buffer->head + 1) % buffer->size) == buffer->tail;
}
int RingBuffer_IsEmpty(RingBuffer_t *buffer)
{
return buffer->head == buffer->tail;
}
```
这样,就可以在STM32上使用环形队列实现串口收发了。需要注意的是,缓冲区大小应该根据实际需求进行调整,避免溢出或浪费内存。
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