From 72836e52e1e386c2f4f5dd70553914a3c8feb325 Mon Sep 17 00:00:00 2001
From: Jonas Gunz <jonas.gunz@googlemail.com>
Date: Sun, 19 Oct 2014 22:35:32 +0200
Subject: Uploaded

---
 Tacho_screen.c | 189 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 189 insertions(+)
 create mode 100644 Tacho_screen.c

(limited to 'Tacho_screen.c')

diff --git a/Tacho_screen.c b/Tacho_screen.c
new file mode 100644
index 0000000..df8d34c
--- /dev/null
+++ b/Tacho_screen.c
@@ -0,0 +1,189 @@
+/*
+ * Tacho.c
+ *
+ * Created: 19.06.2014 15:33:40
+ *  Author: Jonas
+ */ 
+
+#define F_CPU 1000000
+#include <avr/io.h>
+#include <util/delay.h>
+#include <avr/interrupt.h>
+
+#define _PRIM PORTC
+#define _SEC  PORTD
+
+#define _WHEEL_SIZE 207
+
+//Define characters (negative)
+#define _C1 0b10101111//0b01010000
+#define _C2 0b11001000//0b00110111
+#define _C3 0b10101000//0b00000000
+#define _C4 0b10100101//0b00000000
+#define _C5 0b10110000//0b00000000
+#define _C6 0b10010001//0b00000000
+#define _C7 0b10101110//0b00000000
+#define _C8 0b10000000//0b00000000
+#define _C9 0b10100000//0b00000000
+#define _C0 0b10000010//0b00000000
+#define _C_ 0b11111101
+#define _CCLEAR 255
+ 
+uint32_t cntr; 
+unsigned int speed;
+ 
+ISR(TIMER0_OVF_vect)
+{
+	cntr++;
+}
+
+inline void calcSpeed(void)
+{
+	float tmrSpeed = F_CPU / 256;
+	float tmrTime  = 1 / tmrSpeed;
+	float comTime  = tmrTime * cntr;
+	
+	float mps      = (_WHEEL_SIZE / 100) / comTime;
+	
+	float kmph     = mps * 3.6;
+	
+	speed = (int)kmph;
+}//calcSpeed()
+
+inline void render(int _screen)
+{
+	char cNr[16];
+	
+	int i1, i2;
+	
+	itoa(_screen, cNr, 10); //convert int to string for rendering
+	
+	if(_screen < 10)
+	{
+		i1 = 0;
+		i2 = 1;
+		cNr[1] = '0';
+	}
+	else
+	{
+		i1 = 1;
+		i2 = 0;
+	}
+	
+	if(_screen > 99 || _screen < 0)
+	{
+		_SEC = _PRIM = _C_;
+	}
+	else
+	{
+		switch (cNr[i1]) //first character
+		{
+			case '0':
+				_PRIM = _C0;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '1':
+				_PRIM = _C1;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '2':
+				_PRIM = _C2;
+				PORTB |= (1<<PB2);
+			break;
+			case '3':
+				_PRIM = _C3;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '4':
+				_PRIM = _C4;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '5':
+				_PRIM = _C5;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '6':
+				_PRIM = _C6;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '7':
+				_PRIM = _C7;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '8':
+				_PRIM = _C8;
+				PORTB &= ~(1<<PB2);
+			break;
+			case '9':
+				_PRIM = _C9;
+				PORTB &= ~(1<<PB2);
+			break;
+		}
+		
+		switch (cNr[i2])//second character
+		{
+			case '0':
+				_SEC = _C0;
+			break;
+			case '1':
+				_SEC = _C1;
+			break;
+			case '2':
+				_SEC = _C2;
+			break;
+			case '3':
+				_SEC = _C3;
+			break;
+			case '4':
+				_SEC = _C4;
+			break;
+			case '5':
+				_SEC = _C5;
+			break;
+			case '6':
+				_SEC = _C6;
+			break;
+			case '7':
+				_SEC = _C7;
+			break;
+			case '8':
+				_SEC = _C8;
+			break;
+			case '9':
+				_SEC = _C9;
+			break;
+		}
+	}
+}//render()
+
+int main(void)
+{
+	TCCR0 = (1 << CS00); // Prescaler 1
+	TIMSK = (1<<TOIE0); //Enable Overflowinterrupt
+	
+	cntr = 0; //counter for Timer
+	DDRC = DDRD = 255; // Output for scrren pins
+	DDRB |= (1<<PB2);
+	DDRB &= ~(1<<PB1);
+	
+	sei();
+	
+	render(0);
+	
+	//PORTC = 0b01010000;
+    while(1)//main loop
+	{	
+		while(PINB & (1 << PB1) && cntr < 30000){} // wait for reed
+		TCCR0 = ~(1 << CS00); //disable counter
+		cli(); //disable interrupts
+		calcSpeed();
+		//reset all variables
+		cntr = 0;
+		TCNT0 = 0;
+		sei();//enable interrupts
+		TCCR0 = (1 << CS00); //enable counter
+		
+		render(speed);//render the calculated speed
+		_delay_ms(100);
+	}
+}//main()
\ No newline at end of file
-- 
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