树莓派4与stm32f103串口通信，stm32接收信息，stm32f103代码

好的，下面是一个用于STM32F103与树莓派4串口通信的接收代码示例：

#include "stm32f10x.h"
#include <stdio.h>

#define BUFFER_SIZE 100

char rx_buffer[BUFFER_SIZE];
uint8_t rx_index = 0;
uint8_t rx_data_available = 0;

void USART1_IRQHandler(void) {
    if (USART_GetITStatus(USART1, USART_IT_RXNE) != RESET) {
        rx_buffer[rx_index] = USART_ReceiveData(USART1);
        rx_index++;
        if (rx_index >= BUFFER_SIZE) {
            rx_index = 0; // Reset buffer index if it exceeds the buffer size
        }
        rx_data_available = 1;
    }
}

void USART1_Init(void) {
    GPIO_InitTypeDef GPIO_InitStruct;
    USART_InitTypeDef USART_InitStruct;
    NVIC_InitTypeDef NVIC_InitStruct;

    // Enable clock for USART1 and GPIOA
    RCC_APB2PeriphClockCmd(RCC_APB2Periph_USART1 | RCC_APB2Periph_GPIOA, ENABLE);

    // Configure pins for USART1
    GPIO_InitStruct.GPIO_Pin = GPIO_Pin_9;＊＊＊