barCodeScanningGun/bledome/qr.h

//https://blog.csdn.net/luyang14/article/details/115796909

#include <HardwareSerial.h>

// 定义串口对象Serial2
HardwareSerial Serial2(1);
#define PIN_RX 1
#define PIN_TX 0
#define PIN_BUTTON 2

String qrData = "";
int qrType=0;

String qrOpen = "c:...";
String qrEnd = "c:end";

// 串口2接收中断服务程序
void serialEvent() {

    while (Serial2.available() > 0) {

      if(qrType==0)qrData = "";

      qrType = 1;
      
      char incomingByte = Serial2.read();
      qrData += (char)incomingByte;

    }

    if(qrType==1){

      Serial.println("qrData: " + qrData);
      String str = "c:" + qrData;
      pCharacteristic->setValue(str.c_str());
      digitalWrite(PIN_BUTTON,HIGH); //这里扫码成功后需要你自己拉高电频 不然扫码成功后返回数据你再次拉低失败的
      qrType = 0;
    }

}

void qrCommand(){

    String command = pCharacteristic->getValue().c_str();

    if (command.startsWith("2:0")) {

      pCharacteristic->setValue(qrOpen.c_str());

      digitalWrite(PIN_BUTTON,LOW);

    } else if (command.startsWith("2:1")) {

      pCharacteristic->setValue(qrEnd.c_str());

      digitalWrite(PIN_BUTTON,HIGH);
    } 
    
}

void qrSetup(){

  Serial2.begin(9600, SERIAL_8N1,PIN_RX,PIN_TX); // 设置串口的波特率、1数据位、奇偶校验位和停止位

  pinMode(PIN_BUTTON,OUTPUT);//设置引脚为输出
  digitalWrite(PIN_BUTTON,HIGH);//高电平关
  // digitalWrite(PIN_BUTTON,LOW);//低电平开
  
}

int loopQrSize=1000; //loop间隔
int qrMillisTime;
void qrLoop(){

    //1秒读取一次指令
  int qrTimeCurrent = millis();
  
  if(qrTimeCurrent<=0)qrMillisTime = qrTimeCurrent;

  if((qrTimeCurrent - qrMillisTime)>loopQrSize){

    qrMillisTime = qrTimeCurrent;

    qrCommand();
    serialEvent();
  }
}