Update arduino_LA.ino

arduino_LA.ino

@@ -5,41 +5,74 @@
  * Author : Vincenzo
  */ 
 
+
 #define F_CPU 16000000UL
 #include <avr/io.h>
 #include <avr/interrupt.h>
 #include <util/delay.h>
 
 #define samples 200
+#define prescaler 0x02
+volatile uint16_t timer1_overflow_count;
 
 uint8_t initial, state, old_state;
 uint8_t pinChanged[samples];
 uint32_t timer[samples];
 uint16_t event = 0;
 
-volatile uint16_t overflow_count = 0;
-volatile uint32_t total_count = 0;
-
 void init_board() {
   
-  TCCR2B = TCCR2B & 0b11111000 | 0x02;
-  TIMSK2 |= (1 << TIMSK2);  // enable Timer2 overflow interrupt
-  TCCR2A &= 0b11111100;     // timer2 working parameters
-  TCCR2B &= 0b11110111;
-
   PORTC = (0 << 0); DDRC |= (1 << 0); // led A0
   DDRB |= 0x00;     // pin 8-13 input
   PORTB |= 0x3F;    // pull-up
   
 }
 
+void init_timer() {
+
+  //clear
+  TCCR1A = 0b00000000;
+  TCCR1B = 0b00000000;
+  TIMSK1 = 0b00000000;
+
+  //settings
+  TCCR1A |= (0 << COM1A1) | (0 << COM1A0) | (0 << COM1B1) | (0 << COM1B0); //normal port operation
+  TCCR1A |= (0 << WGM11) | (0 << WGM10); //normal operation
+  TCCR1B |= (0 << WGM13) | (0 << WGM12); //normal operation
+  TCCR1B |= prescaler; //(0 << CS12) | (0 << CS11) | (1 << CS10); //clock prescaler
+
+  sei();    //enable interrupts
+  TIMSK1 |= (1 << TOIE1);   // enable overflow interrupt
+
+}
+
+ISR(TIMER1_OVF_vect) {
+  timer1_overflow_count++;
+}
+
+void reset_timer1 () {
+  TCNT1 = 0;
+  timer1_overflow_count = 0;
+}
+
+uint32_t myMicros () {
+  cli();
+
+  if (TIFR1 & (1 << TOV1)) {
+    TIFR1 = (0 << TOV1);
+    timer1_overflow_count++;
+  }
+  
+  uint32_t total_time = (65536 * timer1_overflow_count + TCNT1) / 2;
+  sei();
+  return total_time;
+}
 
 void start() {
   _delay_ms(1000);
 
-  overflow_count = 0;
+  reset_timer1();
   event = 0;
-  TCNT2 = 0;
 
   PORTC = (1 << 0);
   initial = PINB;
@@ -64,32 +97,11 @@ void sendData() {
 }
 
 
-//timer:
-uint32_t get_time() {
-  
-  cli();
-  uint8_t tcnt2_save = TCNT2;
-  uint8_t flag_save = TOV2;  //timer2 overflow flag
-
-  if (flag_save) {
-    tcnt2_save = TCNT2;
-    overflow_count++;     //manual increment of the overflow counter
-    TIFR2 = (0 << TOV2); //reset overflow flag to prevent execution of the ISR
-  }
-
-  total_count = (overflow_count * 256 + tcnt2_save) / 2;
-  sei();
-  return total_count;
-}
-
-ISR(TIMER2_OVF_vect) {
-  overflow_count++;
-}
-
 int main(void) {
   Serial.begin(9600);
   
   init_board();
+  init_timer();
 
   start();
 
@@ -99,7 +111,7 @@ int main(void) {
     state = PINB;
   
   if (old_state != state) {
-    timer[event] = get_time();
+    timer[event] = myMicros();
     pinChanged[event] = state ^ old_state;
     event++;