// MCP23017 I/O test

#include <Adafruit_MCP23X17.h>
#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27,16,2);
Adafruit_MCP23X17 mcp;
int inputData;
int outputData;
int cnt;
boolean x;
  
void setup() {
  lcd.init(); 
  lcd.backlight();
  lcd.setCursor(0, 0);
  lcd.print("COSMOLIGHT");
  lcd.setCursor(0, 1);
  lcd.print("Project Arduino");

  mcp.begin_I2C(0x20);
  // GPA0~7を出力に設定
  for (int i = 0; i <= 7; i++) {
    mcp.pinMode(i, OUTPUT);
  }
  // GPB0~7を入力に設定
  for (int i = 8; i <= 15; i++) {
    mcp.pinMode(i, INPUT);
  }
  delay(3000);
  cnt = 0;
}

void lcdDisp(void) {
  lcd.clear();
  lcd.setCursor(0, 0);
  lcd.print("SW data");
  lcd.setCursor(0, 1);
  lcd.print(String(outputData, BIN));  
}

void loop(){
  byte inputData = 0;
  // GPB0～7の状態をGPA0～7へ出力
  for (int i = 8; i <= 15; i++) {
    x = mcp.digitalRead(i);
    mcp.digitalWrite(i - 8, x);
    inputData = inputData | (x << (i - 8));
  }
  outputData = ~inputData;
  if (cnt > 5) {
    lcdDisp();
    cnt = 0;
    outputData = 0;
  }
  cnt++;
  delay(200);
}