hal库串口中断例程
时间: 2023-06-29 15:06:24 浏览: 104
下面是一个使用HAL库的串口中断例程:
```c
#include "stm32f4xx_hal.h"
#define UART_BUFFER_SIZE 128
UART_HandleTypeDef huart2;
uint8_t uart_rx_buffer[UART_BUFFER_SIZE];
volatile uint8_t uart_rx_head = 0;
volatile uint8_t uart_rx_tail = 0;
void HAL_UART_RxCpltCallback(UART_HandleTypeDef *huart)
{
if (huart->Instance == USART2)
{
// 将接收到的字节存储到环形缓冲区中
uart_rx_buffer[uart_rx_head] = huart->Instance->DR;
uart_rx_head = (uart_rx_head + 1) % UART_BUFFER_SIZE;
// 启动下一次接收中断
HAL_UART_Receive_IT(&huart2, &uart_rx_buffer[uart_rx_tail], 1);
}
}
int main(void)
{
HAL_Init();
__HAL_RCC_GPIOA_CLK_ENABLE();
__HAL_RCC_USART2_CLK_ENABLE();
GPIO_InitTypeDef GPIO_InitStruct;
GPIO_InitStruct.Pin = GPIO_PIN_2 | GPIO_PIN_3;
GPIO_InitStruct.Mode = GPIO_MODE_AF_PP;
GPIO_InitStruct.Pull = GPIO_PULLUP;
GPIO_InitStruct.Speed = GPIO_SPEED_FREQ_VERY_HIGH;
GPIO_InitStruct.Alternate = GPIO_AF7_USART2;
HAL_GPIO_Init(GPIOA, &GPIO_InitStruct);
huart2.Instance = USART2;
huart2.Init.BaudRate = 115200;
huart2.Init.WordLength = UART_WORDLENGTH_8B;
huart2.Init.StopBits = UART_STOPBITS_1;
huart2.Init.Parity = UART_PARITY_NONE;
huart2.Init.Mode = UART_MODE_TX_RX;
huart2.Init.HwFlowCtl = UART_HWCONTROL_NONE;
HAL_UART_Init(&huart2);
// 启动接收中断
HAL_UART_Receive_IT(&huart2, &uart_rx_buffer[uart_rx_tail], 1);
while (1)
{
// 处理接收到的字节
if (uart_rx_head != uart_rx_tail)
{
uint8_t ch = uart_rx_buffer[uart_rx_tail];
uart_rx_tail = (uart_rx_tail + 1) % UART_BUFFER_SIZE;
// 处理接收到的字节
// ...
}
}
}
```
在这个例程中,我们使用了环形缓冲区来存储接收到的字节。当接收到一个字节时,我们将它存储到缓冲区中,并启动下一次接收中断。在主循环中,我们不断地检查缓冲区是否有新的数据,如果有就处理它们。
请注意,在使用HAL库时,我们需要在`main()`函数之外实现中断回调函数。在这个例程中,我们实现了`HAL_UART_RxCpltCallback()`函数来处理串口接收中断。当接收到一个字节时,我们将它存储到缓冲区中,并启动下一次接收中断。
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