GPIO pins go high on startup

[svollenweider]

Dear all
The GPIO pins seem to go high on startup when calling digital_programmables.init(). I have fixed it by setting the Pin to off before setting the pinMode.

Line 86 of ArduinoIOExpander.cpp looks now like this. Everything seems to work as intended

  void ArduinoIOExpanderClass::initPins()
  {
      if (_tca.getAddress() == IO_ADD) {
        PinStatus status = SWITCH_OFF;
        set(IO_WRITE_CH_PIN_00, status);
        set(IO_WRITE_CH_PIN_01, status);
        set(IO_WRITE_CH_PIN_02, status);
        set(IO_WRITE_CH_PIN_03, status);
        set(IO_WRITE_CH_PIN_04, status);
        set(IO_WRITE_CH_PIN_05, status);
        set(IO_WRITE_CH_PIN_06, status);
        set(IO_WRITE_CH_PIN_07, status);
        set(IO_WRITE_CH_PIN_08, status);
        set(IO_WRITE_CH_PIN_09, status);
        set(IO_WRITE_CH_PIN_10, status);
        set(IO_WRITE_CH_PIN_11, status);
        
        pinMode(IO_WRITE_CH_PIN_00, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_01, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_02, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_03, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_04, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_05, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_06, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_07, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_08, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_09, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_10, OUTPUT);
        pinMode(IO_WRITE_CH_PIN_11, OUTPUT);
        pinMode(IO_READ_CH_PIN_00, INPUT);
        pinMode(IO_READ_CH_PIN_01, INPUT);
        pinMode(IO_READ_CH_PIN_02, INPUT);
        pinMode(IO_READ_CH_PIN_03, INPUT);
        pinMode(IO_READ_CH_PIN_04, INPUT);
        pinMode(IO_READ_CH_PIN_05, INPUT);
        pinMode(IO_READ_CH_PIN_06, INPUT);
        pinMode(IO_READ_CH_PIN_07, INPUT);
        pinMode(IO_READ_CH_PIN_08, INPUT);
        pinMode(IO_READ_CH_PIN_09, INPUT);
        pinMode(IO_READ_CH_PIN_10, INPUT);
        pinMode(IO_READ_CH_PIN_11, INPUT);
      } else {
        pinMode(DIN_READ_CH_PIN_00, INPUT);
        pinMode(DIN_READ_CH_PIN_01, INPUT);
        pinMode(DIN_READ_CH_PIN_02, INPUT);
        pinMode(DIN_READ_CH_PIN_03, INPUT);
        pinMode(DIN_READ_CH_PIN_04, INPUT);
        pinMode(DIN_READ_CH_PIN_05, INPUT);
        pinMode(DIN_READ_CH_PIN_06, INPUT);
        pinMode(DIN_READ_CH_PIN_07, INPUT);
      }
  }

So far I have not observed any unwanted effects from this change

[svollenweider]

Hi,
Any Updates on this?