/*
    Description: Control 4 relays and demonstrate the asynchronous control relay LED
*/

#include <M5Stack.h>

/*-----------------------------------------------------------------------------*/
// |RELAY control reg          | 0x10
// |-----------------------------------------------------------------------------
// |Relay_ctrl_mode_reg[0]     | R/W | System control
//                                   | 7 | 6 | 5 | 4 | 3 | 2 | 1 |     0     |
//                                   | R | R | R | R | R | R | R | Sync Mode |
//                                   | -Sync Mode:0 LED&Relay Async
//                                   | -Sync Mode:1 LED&Relay Sync
//---------------------------------------------------------------------------------
// |Relay_ctrl_mode_reg[1]     | R/W | Relay & LED control
//                             |  7  |  6  |  5  |  4  |  3  |  2  |  1  |  0  |
//                             | LED1| LED2| LED3| LED4| RLY1| RLY2| RLY3| RLY4|
//
/*-------------------------------------------------------------------------------*/

void WriteRelayReg( int regAddr, int data )
{
    Wire.beginTransmission(0x26);
    Wire.write(regAddr);
    Wire.write(data);
    Wire.endTransmission();
    Serial.printf("[ W ] %02X : %02X. \r\n", regAddr, data);
}

int readRelayReg(int regAddr)
{
    Wire.beginTransmission(0x26);
    Wire.write(regAddr);
    Wire.endTransmission();
    Wire.requestFrom(0x26, 1);
    int data = Wire.read() & 0x00ff;
    Serial.printf("[ R ] %02X : %02X. \r\n", regAddr, data);
    return data;
}

void WriteRelayNumber( int number, int state )
{
    int StateFromDevice = readRelayReg(0x11);
    if( state == 0 )
    {
        StateFromDevice &= ~( 0x01 << number );
    }
    else
    {
        StateFromDevice |= ( 0x01 << number );
    }
    WriteRelayReg(0x11,StateFromDevice);
}

void setup() {
  // put your setup code here, to run once:
  M5.begin(true, true, true, true);
  M5.Lcd.setCursor(90, 0, 4);
  M5.Lcd.setTextColor(TFT_GREEN, TFT_BLACK);
  M5.Lcd.print("4-RELAY UNIT");
  M5.Lcd.setCursor(0, 220, 2);
  M5.Lcd.print("Independent Switch");
  M5.Lcd.setCursor(130, 220, 2);
  M5.Lcd.print("LED Sync/Async");
  M5.Lcd.setCursor(250, 220, 2);
  M5.Lcd.print("ALL Relay");
  M5.Lcd.setCursor(20, 50, 4);
  M5.Lcd.print("Relay State: ");
  M5.Lcd.setCursor(20, 80, 4);
  M5.Lcd.print("Sync Mode: ");
  readRelayReg(0x10);
  readRelayReg(0x11);
  WriteRelayReg(0x10,1);
  WriteRelayReg(0x11,0);
  //WriteRelayNumber(0,0);
}

int count_i = 0;
bool flag_led, flag_relay = false;


void loop() {
    if(M5.BtnA.wasPressed()){
      M5.Lcd.fillRect(160, 50, 100, 20, TFT_BLACK);
      M5.Lcd.setCursor(160, 50, 4);
      M5.Lcd.printf("%d ON", count_i);
      WriteRelayReg(0x11,(0x01 << count_i));
      count_i++;    
      if( count_i >= 4 ) count_i = 0; 
    }
    if(M5.BtnB.wasPressed()){
      M5.Lcd.fillRect(160, 80, 100, 20, TFT_BLACK);
      if(!flag_led){
        M5.Lcd.setCursor(160, 80, 4);
        M5.Lcd.print("Async");
        WriteRelayReg(0x10, 0);
      }else {
        M5.Lcd.setCursor(160, 80, 4);
        M5.Lcd.print("Sync");
        WriteRelayReg(0x10, 1);
      }
      flag_led = !flag_led;     
    }
    if(M5.BtnC.wasPressed()){
        M5.Lcd.fillRect(160, 50, 100, 20, TFT_BLACK);
        for(int i=0; i<4; i++){
          if(!flag_relay) {
            M5.Lcd.setCursor(160, 50, 4);
            M5.Lcd.print("ON");
            WriteRelayNumber(i, 1);    
          }else {
            M5.Lcd.setCursor(160, 50, 4);
            M5.Lcd.print("OFF");
            WriteRelayNumber(i, 0); 
          }
        }
        flag_relay = !flag_relay;
    }
    M5.update();
}