c语言，串口，stm32，根据串口输入的不同字符串，打印不同的信息

可以使用STM32的串口接收中断来实现该功能。首先需要在代码中定义一个接收缓冲区，用于存储串口接收到的数据。然后在串口接收中断中，将接收到的数据存储到接收缓冲区中。接着，根据接收到的字符串内容，使用条件语句来判断需要打印的信息，并将其发送到串口输出缓冲区中，最后通过串口发送中断将信息发送出去。以下是示例代码：

#include "stm32f10x.h"

#define RX_BUF_SIZE  64

uint8_t rx_buf[RX_BUF_SIZE];
uint8_t rx_len = 0;

void USART1_IRQHandler(void)
{
    if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET)
    {
        uint8_t data = USART_ReceiveData(USART1);
        if (rx_len < RX_BUF_SIZE)
        {
            rx_buf[rx_len++] = data;
        }
    }
}

void print_info(uint8_t* str)
{
    if (strcmp(str, "hello") == 0)
    {
        printf("Hello World!\r\n");
    }
    else if (strcmp(str, "name") == 0)
    {
        printf("My name is C知道.\r\n");
    }
    else
    {
        printf("Unknown command.\r\n");
    }
}

int main(void)
{
    USART_InitTypeDef USART_InitStructure;

    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1, ENABLE);

    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);

    USART_ITConfig(USART1, USART_IT_RXNE, ENABLE);

    NVIC_InitTypeDef NVIC_InitStructure;

    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);

    USART_Cmd(USART1, ENABLE);

    while (1)
    {
        if (rx_len > 0)
        {
            print_info(rx_buf);
            rx_len = 0;
        }
    }
}