需要給esp32和stm32進(jìn)行通信，想著先用串口連接，調(diào)試一下功能，記錄如下：

物料

ESP32-S3-DevKitC-1（淘寶買的）
STM32F103C8T6（嘉立創(chuàng)的地闊星-新人送的）

接線

電腦-esp32-stm32-led

特別注意自己的引腳！！！
ESP32-S3-DEVKITC-1的引腳是17和18，不是16和17
Serial1.begin需要傳入指定引腳，不能用HardwareSerial里的宏定義

詳細(xì)引腳見espressif

HardwareSerial引腳定義

實(shí)物圖如下

ESP32代碼

#include <Arduino.h>
#include <USB.h>
#include <USBCDC.h>

USBCDC USBSerial;

int counter = 0;

void setup() {
  USB.begin();
  USBSerial.begin(115200);

  // 等待USB CDC連接
  while (!USBSerial) {
    delay(10);
  }
  USBSerial.println("ESP32 starting...");

  // 初始化Serial1 (GPIO17/GPIO18) 用于與STM32通信
  Serial1.begin(115200, SERIAL_8N1, 17, 18);
  USBSerial.println("ESP32 ready to communicate with STM32");
}

void loop() {
  // 發(fā)送數(shù)據(jù)到STM32
  String message = String(counter);
  Serial2.println(message);
  USBSerial.println("esp32 send: " + message);

  delay(1000);

  // 檢查是否收到STM32的數(shù)據(jù)
  if (Serial2.available()) {
    USBSerial.print("Received from STM32 (");
    USBSerial.print(Serial2.available());
    USBSerial.print(" bytes): ");
    USBSerial.println(Serial2.readStringUntil('\n'));
  } else {
    USBSerial.println("No data received from STM32");
  }

  counter++;
  // delay(1000);
}

STM32代碼

/*
 * Test program for the STM32F103C8T6
 * 通過USART1 (PA9/PA10) 與ESP32通信
 */
#include "Arduino.h"

void setup() {
  // 初始化USB串口用于調(diào)試
  Serial1.begin(115200);
  Serial1.println("STM32 starting...");
  pinMode(PA1, OUTPUT);
  Serial1.println("STM32 ready to communicate with ESP32");
}

void loop() {
  // 發(fā)送數(shù)據(jù)到ESP32
  if (Serial1.available()) {
    String message = "STM32 " + Serial1.readStringUntil('\n');
    Serial1.println(message);
  }else{
    Serial1.println("stm32 nothing");
  }
  // LED指示
  digitalWrite(PA1, HIGH);
  delay(500);
  digitalWrite(PA1, LOW);
  delay(500);
}

運(yùn)行結(jié)果

13:42:08.316 -> Received from STM32 (12 bytes): STM32 462


13:42:08.316 -> esp32 send: 465
13:42:09.317 -> Received from STM32 (12 bytes): STM32 463


13:42:09.317 -> esp32 send: 466
13:42:10.331 -> Received from STM32 (12 bytes): STM32 464


13:42:10.331 -> esp32 send: 467
13:42:11.315 -> Received from STM32 (12 bytes): STM32 465


13:42:11.315 -> esp32 send: 468
13:42:12.314 -> Received from STM32 (12 bytes): STM32 466


13:42:12.314 -> esp32 send: 469
13:42:13.324 -> Received from STM32 (12 bytes): STM32 467


13:42:13.324 -> esp32 send: 470
13:42:14.300 -> Received from STM32 (12 bytes): STM32 468


13:42:14.300 -> esp32 send: 471
13:42:15.300 -> Received from STM32 (12 bytes): STM32 469


13:42:15.300 -> esp32 send: 472
13:42:16.327 -> Received from STM32 (12 bytes): STM32 470


13:42:16.327 -> esp32 send: 473

說明

1. ESP32的Serial2和STM32的Serial1通信，默認(rèn)io口為ESP32的17/18對應(yīng)STM32的A10/A09
2. ESP32需要Serial2.begin(115200, SERIAL_8N1, 17, 18)，否則會(huì)讀不到數(shù)據(jù)，available結(jié)果是240
3. STM32接一個(gè)LED燈表示STM32在運(yùn)行