#include <DFRobot_MCP23017.h>
#include <HardwareSerial.h>

HardwareSerial Sender(2);   // Define a Serial port instance called 'Sender' using serial port 1

#define Sender_Txd_pin 17
#define Sender_Rxd_pin 16

int EtatLED = 0;
int  EtatBP = 0;
int  EtatPrecd = 0;
int EtatLEDPrecd =0;
bool Unefois = false;


DFRobot_MCP23017 mcp027(Wire, /*addr =*/0x27);//constructor, change the Level of A2, A1, A0 via DIP switch to revise I2C address within 0x20~0x27

//Prepare: connect the LED to a digital pin of IO expansion board(eg:eGPA7)
void setup(void)
{
 Serial.begin(115200);                                             // Define and start serial monitor
 Sender.begin(9600, SERIAL_8N1, Sender_Txd_pin, Sender_Rxd_pin);
 
  while(mcp027.begin() != 0){
    Serial.println("Initialization of the chip failed, please confirm that the chip connection is correct!");
     delay(1000);
  }
 
 
  mcp027.pinMode(/*pin = */mcp027.eGPB0, /*mode = */OUTPUT);
  mcp027.pinMode(/*pin = */mcp027.eGPA0, /*mode = */INPUT);
 
}

void loop(void)
{
      EtatPrecd = EtatBP ;
      EtatBP = mcp027.digitalRead(/*pin = */mcp027.eGPA0);
      delay(100);
      //Serial.print("EtatBP  :");
      //Serial.println(EtatBP);
      /*delay(1000);
      Serial.print("verrou1  :");
      Serial.println(verrou);*/
 
 if  ((EtatPrecd == 1) && (EtatBP == 0 )) { 
      Serial.print("BP pressé  :");
      //Serial.println(verrou);
      EtatLEDPrecd = EtatLED;
      EtatLED = !EtatLED;
      Serial.print("EtatLED  :");
      Serial.println(EtatLED);
      }  
  if(EtatLED == 0 ){
  mcp027.digitalWrite(mcp027.eGPB0, LOW); 
  if ( Unefois == false ) {
      Sender.print("allume"); 
      Unefois = !Unefois ;
  }   
  Serial.print("Valeur transmise avec appui BP  : ");
  Serial.println(EtatLED );
  delay(100);
 
  }
  else if  (( EtatLED ==1 ) && (EtatLEDPrecd == 0)) {
  mcp027.digitalWrite(mcp027.eGPB0, HIGH);
  //Sender.print(EtatLED ); 
  if ( Unefois == true) {
      Sender.print("eteint"); 
      Unefois = !Unefois ;
  }   
  Serial.print("Valeur transmise sans appui BP   : ");
  Serial.println(EtatLED );
  delay(100);
  }

}