Update arduino_LA.ino

arduino_LA.ino

@@ -1,17 +1,27 @@
+/*
+ * LA.cpp
+ *
+ * Created: 11/12/2016 19.35.51
+ * Author : Vincenzo
+ */ 
+
+#define F_CPU 16000000UL
+#include <avr/io.h>
+#include <avr/interrupt.h>
+#include <util/delay.h>
+
 #define samples 200
 
-uint8_t state, old_state, initial;
-uint8_t changed[samples];
+uint8_t initial, state, old_state;
+uint8_t pinChanged[samples];
 uint32_t timer[samples];
 uint16_t event = 0;
 
-volatile uint64_t overflow_count = 0;
-volatile uint64_t total_count = 0;
-
-
-int main(void) {
-  Serial.begin(9600);
+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
@@ -20,39 +30,21 @@ int main(void) {
   PORTC = (0 << 0); DDRC |= (1 << 0); // led A0
   DDRB |= 0x00;     // pin 8-13 input
   PORTB |= 0x3F;    // pull-up
-
-  start();
-
-  while (1) {
-    old_state = state;
-    state = PINB;
-
-    if (old_state != state) {
-      timer[event] = get_time();
-      changed[event] = old_state ^ state;
-      event++;
-
-      if (event == samples) {
-        sendData();
-        while (Serial.read() != 'G') ; //wait for the "go"
-        start();
-      }
-    }
-  }
+  
 }
 
+
 void start() {
   _delay_ms(1000);
 
-  TCNT2 = 0;
   overflow_count = 0;
   event = 0;
+  TCNT2 = 0;
 
   PORTC = (1 << 0);
   initial = PINB;
   state = initial;
 
-  //in futuro potrei fare in modo che time[0] è impostato qui
 }
 
 
@@ -60,13 +52,13 @@ void sendData() {
   PORTC = (0 << 0);   //turn off led
 
   //initial data
-  Serial.print("S"); Serial.println("");
+  Serial.println("S");
   Serial.print(initial); Serial.print(":");
   Serial.println(samples);
 
   //data
   for (int i = 0; i < samples; i++) {
-    Serial.print(changed[i]); Serial.print(":");
+    Serial.print(pinChanged[i]); Serial.print(":");
     Serial.println(timer[i]);
   }
 }
@@ -74,14 +66,15 @@ void sendData() {
 
 //timer:
 uint32_t get_time() {
+  
   cli();
   uint8_t tcnt2_save = TCNT2;
-  boolean flag_save = TIMSK2 & (1 << TIFR2); //timer2 overflow flag
+  uint8_t flag_save = TOV2;  //timer2 overflow flag
 
   if (flag_save) {
     tcnt2_save = TCNT2;
     overflow_count++;     //manual increment of the overflow counter
-    TIFR2 = (1 << TIFR2); //reset overflow flag to prevent execution of the ISR
+    TIFR2 = (0 << TOV2); //reset overflow flag to prevent execution of the ISR
   }
 
   total_count = (overflow_count * 256 + tcnt2_save) / 2;
@@ -92,3 +85,29 @@ uint32_t get_time() {
 ISR(TIMER2_OVF_vect) {
   overflow_count++;
 }
+
+int main(void) {
+  Serial.begin(9600);
+  
+  init_board();
+
+  start();
+
+  while (1) {
+    
+    old_state = state;
+    state = PINB;
+  
+  if (old_state != state) {
+    timer[event] = get_time();
+    pinChanged[event] = state ^ old_state;
+    event++;
+
+    if (event == samples) {
+      sendData();
+      while (Serial.read() != 'G') ;  //wait for the "go"
+      start();
+    }
+    }
+  }
+}