retry_read_tca

#include <Wire.h>
#include "TCA9555.h"
TCA9555 TCA1(0x20);
TCA9555 TCA2(0x21);
byte pin_tca[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 };

#define TCA9555_INPUT_PORT_REGISTER_0 0x00  //  read(0-7)
#define TCA9555_INPUT_PORT_REGISTER_1 0x01  //  read(8-15)
byte data_tca1_port0 = 0;
byte data_tca1_port1 = 0;
unsigned long cur_time, old_time;
bool port0 = 0;
bool port1 = 1;

byte addr_tca1 = 0x20;
byte addr_tca2 = 0x21;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Wire.begin();
  TCA1.begin();
  TCA2.begin();
  for (int i = 0; i < sizeof(pin_tca); i++) {
    Serial.print(i);
    Serial.print(",");
    TCA1.pinMode(pin_tca[i], INPUT_PULLUP);
    TCA2.pinMode(pin_tca[i], INPUT_PULLUP);
  }
}

void loop() {
  // put your main code here, to run repeatedly:
  cur_time = millis();
  if (cur_time - old_time > 100) {
    byte _retry = 0;
    while (!baca_input1(addr_tca1, port0) && _retry < 10) {
      _retry++;
      Serial.print("retry: ");
      Serial.println(_retry);
      delay(20);
    }
    _retry = 0;
    while (!baca_input1(addr_tca1, port1) && _retry < 10) {
      _retry++;
      Serial.print("retry: ");
      Serial.println(_retry);
      delay(20);
    }

    Serial.print("tca1 port0: ");
    Serial.println(data_tca1_port0,BIN);
    Serial.print("tca1 port1: ");
    Serial.println(data_tca1_port1,BIN);

    old_time = millis();
  }
}

bool baca_input1(byte addr, byte mask) {
  bool flag_tca = 0;
  Wire.beginTransmission(addr);
  switch (mask) {
    case 0:
      Wire.write(TCA9555_INPUT_PORT_REGISTER_0);
      break;
    case 1:
      Wire.write(TCA9555_INPUT_PORT_REGISTER_1);
      break;
  }

  int rv = 0;
  rv = Wire.endTransmission();
  if (rv != 0) {
    flag_tca = 0;
    Serial.println("gagal baca");
  } else {
    Wire.requestFrom(addr, (uint8_t)1);
    switch (mask) {
      case 0:
        data_tca1_port0 = Wire.read();
        break;
      case 1:
        data_tca1_port1 = Wire.read();
        break;
    }

    flag_tca = 1;
  }
  return flag_tca;
}