STM32 uart 中断fifo 接收字符串例程 标准库
时间: 2023-10-07 12:14:16 浏览: 68
好的,下面是一个基于STM32标准库的UART中断FIFO接收字符串的例程:
```c
#include "stm32f10x.h"
#define RX_BUFFER_SIZE 128
volatile uint8_t rx_buffer[RX_BUFFER_SIZE];
volatile uint8_t rx_head = 0;
volatile uint8_t rx_tail = 0;
void USART1_IRQHandler(void)
{
// Check if the USART1 receive interrupt flag was set
if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
// Read one byte from the USART1 receive data register
uint8_t data = USART_ReceiveData(USART1);
// Calculate the index of the next location to write to
uint8_t next_head = (rx_head + 1) % RX_BUFFER_SIZE;
// Check if the buffer is full
if (next_head != rx_tail)
{
// Store the received byte in the buffer
rx_buffer[rx_head] = data;
rx_head = next_head;
}
}
}
void USART1_Init(void)
{
USART_InitTypeDef USART_InitStruct;
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
USART_InitStruct.USART_BaudRate = 115200;
USART_InitStruct.USART_WordLength = USART_WordLength_8b;
USART_InitStruct.USART_StopBits = USART_StopBits_1;
USART_InitStruct.USART_Parity = USART_Parity_No;
USART_InitStruct.USART_HardwareFlowControl = USART_HardwareFlowControl_None;
USART_InitStruct.USART_Mode = USART_Mode_Rx | USART_Mode_Tx;
USART_Init(USART1, &USART_InitStruct);
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
NVIC_EnableIRQ(USART1_IRQn);
USART_Cmd(USART1, ENABLE);
}
int main(void)
{
USART1_Init();
while (1)
{
// Check if there is data in the buffer
if (rx_head != rx_tail)
{
// Process the received data
while (rx_head != rx_tail)
{
uint8_t data = rx_buffer[rx_tail];
rx_tail = (rx_tail + 1) % RX_BUFFER_SIZE;
// Check for a newline character
if (data == '\n')
{
// Process the received string
// ...
// Clear the buffer
rx_head = rx_tail = 0;
}
}
}
}
}
```
在此例程中,我们使用了一个循环队列作为接收缓冲区,当接收到一个字节时,将其存储在队列的尾部,并将队列头指针向前移动一个位置。如果队列已满,则忽略接收的字节。在主循环中,我们检查队列是否非空,如果是,则逐个处理已接收的字节,直到遇到一个换行符('\n'),表示已接收到完整的字符串。在处理完字符串后,我们清空队列,以便接收下一个字符串。
请注意,此例程仅演示了如何接收字符串,您需要根据自己的需求进行修改。例如,您可能需要添加一些错误处理代码,以避免接收到意外的字符或超出缓冲区大小。
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