X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=firmware%2Ftimer.c;h=b218ed607e038370833867ff092c01b8835e82a5;hb=a99e18c8e7ec3276ba6a881d1eaccf2d7fc26ea6;hp=043dff8a4037389afbc0bb894548753fbb0881f1;hpb=d8a31ed675778c08ca781beb62863c62d6f0bd94;p=model-railway-devices.git

diff --git a/firmware/timer.c b/firmware/timer.c
index 043dff8..b218ed6 100644
--- a/firmware/timer.c
+++ b/firmware/timer.c
@@ -1,55 +1,108 @@
+/* $Id$
+
+This file is part of R²C²
+Copyright © 2010  Mikkosoft Productions, Mikko Rasa
+Distributed under the GPL
+*/
+
 #include <avr/io.h>
-#include <avr/interrupt.h>
 #include "timer.h"
 
 #define BIT(n) (1<<(n))
 
-static TimerCallback *timer_callback;
-
-void timer_init(uint16_t freq_p, uint8_t freq_q)
+static void timer_start(uint8_t num, uint32_t period)
 {
-	uint32_t period = F_CPU*freq_q/freq_p;
 	uint8_t cs;
 
-	if(period<0x10000)
-	{
-		cs = BIT(CS10);
-	}
-	else if(period<0x80000)
-	{
-		cs = BIT(CS11);
-		period /= 8;
-	}
-	else if(period<0x400000)
-	{
-		cs = BIT(CS11) | BIT(CS10);
-		period /= 64;
-	}
-	else if(period<0x1000000)
+	if(num==0)
 	{
-		cs = BIT(CS12);
-		period /= 256;
+		if(period<0x100)
+		{
+			cs = BIT(CS00);
+		}
+		else if(period<0x800)
+		{
+			cs = BIT(CS01);
+			period /= 8;
+		}
+		else if(period<0x4000)
+		{
+			cs = BIT(CS01) | BIT(CS00);
+			period /= 64;
+		}
+		else if(period<0x10000)
+		{
+			cs = BIT(CS02);
+			period /= 256;
+		}
+		else
+		{
+			cs = BIT(CS02) | BIT(CS00);
+			period /= 1024;
+			if(period>0xFF)
+				period = 0xFF;
+		}
+		TCCR0A = BIT(WGM01);
+		TCCR0B = cs;
+		OCR0A = period;
+		TIMSK0 = BIT(OCIE0A);
 	}
-	else
+	if(num==1)
 	{
-		cs = BIT(CS12) | BIT(CS10);
-		period /= 1024;
-		if(period>0xFFFF)
-			period = 0xFFFF;
+		if(period<0x10000)
+		{
+			cs = BIT(CS10);
+		}
+		else if(period<0x80000)
+		{
+			cs = BIT(CS11);
+			period /= 8;
+		}
+		else if(period<0x400000)
+		{
+			cs = BIT(CS11) | BIT(CS10);
+			period /= 64;
+		}
+		else if(period<0x1000000)
+		{
+			cs = BIT(CS12);
+			period /= 256;
+		}
+		else
+		{
+			cs = BIT(CS12) | BIT(CS10);
+			period /= 1024;
+			if(period>0xFFFF)
+				period = 0xFFFF;
+		}
+		TCCR1A = 0;
+		TCCR1B = BIT(WGM12) | cs;
+		OCR1AH = period>>8;
+		OCR1AL = period;
+		TIMSK1 = BIT(OCIE1A);
 	}
-	TCCR1A = 0;
-	TCCR1B = BIT(WGM12) | cs;
-	OCR1AH = period>>8;
-	OCR1AL = period;
 }
 
-void timer_set_callback(TimerCallback *cb)
+void timer_start_hz(uint8_t num, uint32_t freq_p, uint8_t freq_q)
+{
+	timer_start(num, F_CPU*freq_q/freq_p);
+}
+
+void timer_start_us(uint8_t num, uint32_t us)
 {
-	timer_callback = cb;
-	TIMSK1 |= BIT(OCIE1A);
+	timer_start(num, F_CPU/1000000*us);
 }
 
-ISR(TIMER1_COMPA_vect)
+void timer_stop(uint8_t num)
 {
-	timer_callback();
+	if(num==0)
+	{
+		TCCR0B = 0;
+		TIMSK0 = 0;
+	}
+	else if(num==1)
+	{
+		TCCR1B = 0;
+		TIMSK1 = 0;
+	}
 }