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Code: Select all

#define BitRead(_Value, _Bit) !(0x01 & (_Value >> (_Bit - 1 ) )) // 1...8 instead of 0...7

Code: Select all

#define BitRead(_Value, _Bit) !(0x01 & (_Value >> (_Bit - 1 ) )) // 1...8 instead of 0...7

int PCF8574ReadPins(byte port, byte address){
  byte cnt = 2;
  byte I2CMsg[];
  byte inbuf[];
  byte nByteReady = 0;
  int  result = -1;

  ArrayBuild(I2CMsg, address);

  while (I2CStatus(port, nByteReady) == STAT_COMM_PENDING){
    Yield();
  }

  if (I2CBytes(port, I2CMsg, cnt, inbuf)) {
    result = inbuf[1];
  }
  if(result==-1){
     TextOut(0, LCD_LINE1, "Error: Check the");
     TextOut(0, LCD_LINE2, "   connection!");
     Wait(500);
     ClearScreen();
  }
  return result;
}


task main() {
  byte PCF8574array[9]; // just to have slots 1...8 to access
  byte PCF8574port=S4, PCF8574addr=0x4E, result;

  SetSensorLowspeed(S4);
  
  while(true) {

    result=PCF8574ReadPins(PCF8574port, PCF8574addr);  // poll the PCF byte once

    for (char i=1; i<9; ++i) {
      PCF8574array[i]= BitRead(result, i);             // bit read the PCF byte
      NumOut( 0, 56-(8*i), i);
      NumOut(18, 56-(8*i), PCF8574array[i]);
    }

    Wait(5);
  }

}

Code: Select all

#define BitRead(_Value, _Bit) (0x01 & ((~_Value) >> (_Bit - 1 ) )) // 1...8 instead of 0...7