帮我写一个esp32cam和stm32之间的uart串口通讯代码，esp32cam基于Arduino,stm32基于keil5

好的，我可以为您提供基于Arduino的ESP32CAM和基于Keil5的STM32之间进行UART串口通讯的代码。

ESP32CAM代码：

#include <HardwareSerial.h>

HardwareSerial Serial2(2);

void setup() {
  Serial.begin(115200);
  Serial2.begin(115200, SERIAL_8N1, 16, 17);
}

void loop() {
  String message = "Hello STM32!";
  Serial.print("Sending message: ");
  Serial.println(message);
  Serial2.println(message);

  if (Serial2.available() > 0) {
    String receivedMessage = Serial2.readString();
    Serial.print("Received message: ");
    Serial.println(receivedMessage);
  }
  
  delay(1000);
}

STM32代码：

#include "stm32f4xx.h"
#include <stdio.h>
#include <string.h>

USART_InitTypeDef USART_InitStructure;

void init_USART1(void)
{
    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_Cmd(USART1, ENABLE);
}

void sendString(char* str){
    while(*str){
        while(USART_GetFlagStatus(USART1, USART_FLAG_TDRE) == RESET);
        USART_SendData(USART1, *str++);
        while(USART_GetFlagStatus(USART1, USART_FLAG_TC) == RESET);
    }
}

void main()
{
    init_USART1();

    while (1)
    {
        if (USART_GetFlagStatus(USART1, USART_FLAG_RXNE) == SET)
        {
            char receivedChar = USART_ReceiveData(USART1);

            if (receivedChar == '\n')
            {
                sendString("Received message: ");
            }

            while (USART_GetFlagStatus(USART1, USART_FLAG_TXE) == RESET);
            USART_SendData(USART1, receivedChar);
        }
    }
}

这些代码可能需要根据您的具体需求进行调整，但是它们应该可以让ESP32CAM和STM32之间进行UART串口通讯。如果您有任何问题，请随时向我提问。