stm32标准库 中断串口接收字符串例程
时间: 2023-09-04 11:15:49 浏览: 176
下是一个使用STM32标准库实现的串口接收字符串的例程,其中包括了中断处理函数和字符串处理函数:
```c
#include "stm32f10x.h"
#include <stdio.h>
#include <string.h>
#define RX_BUFFER_SIZE 100
volatile char rx_buffer[RX_BUFFER_SIZE];
volatile uint32_t rx_index;
void USART1_IRQHandler(void)
{
if(USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
{
char rx_data = USART_ReceiveData(USART1);
if(rx_data == '\r' || rx_data == '\n')
{
rx_buffer[rx_index] = '\0';
rx_index = 0;
printf("Received: %s\r\n", rx_buffer);
}
else if(rx_index < RX_BUFFER_SIZE - 1)
{
rx_buffer[rx_index++] = rx_data;
}
}
}
int main(void)
{
USART_InitTypeDef USART_InitStructure;
GPIO_InitTypeDef GPIO_InitStructure;
NVIC_InitTypeDef NVIC_InitStructure;
/* Enable GPIO clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE);
/* Configure USART Tx as alternate function push-pull */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_9;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_AF_PP;
GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Configure USART Rx as input floating */
GPIO_InitStructure.GPIO_Pin = GPIO_Pin_10;
GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN_FLOATING;
GPIO_Init(GPIOA, &GPIO_InitStructure);
/* Enable USART Clock */
RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);
/* Configure USART */
USART_InitStructure.USART_BaudRate = 9600;
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);
/* Enable USART Receive interrupts */
USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);
/* Enable the USART1 IRQ */
NVIC_InitStructure.NVIC_IRQChannel = USART1_IRQn;
NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
NVIC_Init(&NVIC_InitStructure);
/* Enable USART */
USART_Cmd(USART1, ENABLE);
while(1)
{
// Main loop
}
}
```
在这个例程中,我们使用USART1接收数据,并在接收到回车或换行符时打印出接收到的字符串。
在中断处理函数USART1_IRQHandler中,我们首先检查是否接收到了数据(USART_IT_RXNE)。如果接收到了数据,则读取接收缓冲区中的数据,并进行处理。如果接收到的是回车或换行符,则将接收缓冲区中的数据转换为字符串,并打印出来。如果接收到的是普通字符,则将其存储在接收缓冲区中。在存储字符之前,我们需要先检查接收缓冲区是否已满,以避免溢出。
在主函数中,我们初始化USART1,并启用USART1的接收中断。然后进入主循环,等待中断处理函数处理接收数据。
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