#include <TinyWireM.h>
#include <Tiny4kOLED.h>
#include "font16x32digits.h"
#include <avr/io.h>
//#include <avr/sleep.h>
//#include <avr/interrupt.h>

#include <PinChangeInterrupt.h>

// normal delay() won't work anymore because we are changing Timer1 behavior
// Adds delay_ms and delay_us functions
//#include <util/delay.h>

// Clock at 1mHz
//#define F_CPU 1000000  //F_CPU 1000000. This is used by delay.h library

#define pulses 3
#define reset 4

#define PWMpin6 1

volatile long cpt = 0;
int var = 0;
String nombre = "000";
unsigned long debut;

void splash() {
  //oled.setCursor(15, 1);
  //oled.print(F("ATtiny85+SSD1306"));

  //oled.setCursor(12, 3);
  //oled.print(F("Blue Ring Testeur"));

  oled.setCursor(35, 7);
  oled.print(F("Andre BENARD"));
}

 void PWM_config(){
 //DDRB |= (1<<PB1); //Set pin PB0 as output
 //TCNT0 = 0;
 TCCR0A=0;
 TCCR0B=0;
 
 TCCR0A |= (1 << WGM01 ) | (1 << WGM00); //Fast PWM
 TCCR0A |= (1 << COM0B1) | (1 << COM0B0); 
 
 //TCCR0B |= (1 << CS02) | (1 << CS00); // Prescaler Clk/1024 N=1024
 TCCR0B |= (1 << CS02); // Prescaler Clk/256 N=256

// Fréquence de sortie
// f_pwm = fclock/(N*256)=8000000/(1024*256) = 30Hz
// f_pwm = fclock/(N*256)=1000000/(256*256) = 15Hz
// f_pwm = fclock/(N*256)=1000000/(64*256) = 61Hz
 
 // Port PB0 - pas de génération de signaux PB0, car PB0 sur utilisé pour I2C
 //OCR0A=50; // OC0A +Duty = 50/255*100 = 19.6%

 //Port PB1
 //OCR0B=50; // OC0B +Duty = (255-50)/255*100 = 80.4%  -Duty = 50/255*100 = 19.6%
 OCR0B=6; // OC0B +Duty = (255-6)/255*100 = 97.65%  -Duty = 6/255*100 = 2.35

 // Make PWM pins OUTPUT
 //DDRB |=(1<<DDB0);  // PB0 en sortie - pas de génération de signaux PB0, car PB0 sur utilisé pour I2C
 //DDRB |=(1<<DDB1);  // PB1 en sortie
}

void setup() {
  // set pins to input with a pullup
  pinMode(reset, INPUT); // Pull down 47K externe
  pinMode(pulses, INPUT_PULLUP);
  pinMode(PWMpin6, OUTPUT);

  oled.begin(128, 64, sizeof(tiny4koled_init_128x64br), tiny4koled_init_128x64br);

  // Two fonts are supplied with this library, FONT8X16 and FONT6X8
  oled.setFont(FONT6X8);

  // To clear all the memory
  oled.clear();
  oled.on();

  splash();

  delay(3000);

  init_Display();
 
//attach the new PinChangeInterrupts and enable event functions below
  attachPinChangeInterrupt(digitalPinToPinChangeInterrupt(pulses), pulses_prog, FALLING);
  attachPinChangeInterrupt(digitalPinToPinChangeInterrupt(reset), reset_prog, RISING);

 PWM_config();

}
    
void loop() {
  unsigned long maintenant = millis();
  enablePinChangeInterrupt(digitalPinToPinChangeInterrupt(pulses));
  enablePinChangeInterrupt(digitalPinToPinChangeInterrupt(reset));
      
if (maintenant - debut >= 250) {   
  Affich();
  }
}

void pulses_prog(void) {
// increase value
  cpt++;
}

void reset_prog(void) {
// reset value
  disablePinChangeInterrupt(digitalPinToPinChangeInterrupt(pulses));
  disablePinChangeInterrupt(digitalPinToPinChangeInterrupt(reset));
  cpt=0;
}

void init_Display() {
  oled.clear();
  oled.setFont(FONT8X16P);
  oled.setCursor(5, 0);
  oled.print("Blue Ring Tester");
  oled.setCursor(8, 1);
  oled.setFont(FONT16X32DIGITS);
  oled.setCursor(42, 4);
  oled.print(cpt);
  }

void Affich() {
  //disablePinChangeInterrupt(digitalPinToPinChangeInterrupt(pulses));
  oled.setCursor(42, 4);
  nombre = String(cpt);
  var = nombre.length();

  switch (var) {
  case 1:
    nombre = "00" + String(cpt);
    break;
  case 2:
    nombre = "0" + String(cpt);
    break;
  default:
    nombre = String(cpt);
    break;
  }
  oled.print(nombre);
  debut = millis();
  //delay(3000);
  cpt=0;
  //enablePinChangeInterrupt(digitalPinToPinChangeInterrupt(pulses));
 }