X-Git-Url: https://codewiz.org/gitweb?a=blobdiff_plain;f=drv%2Ftimer_avr.h;h=24db1bcf8102d33d68809b2f5c809a489d3a55a6;hb=3bb41294aab4b0d1ee4cf5bea166848180863b54;hp=15bf8730f476ce61dc7b11eb45bd1c94c5635fe7;hpb=d0c3b9f14ce6bcf214e6957b888183a30baae13d;p=bertos.git

diff --git a/drv/timer_avr.h b/drv/timer_avr.h
index 15bf8730..24db1bcf 100755
--- a/drv/timer_avr.h
+++ b/drv/timer_avr.h
@@ -15,6 +15,18 @@
 
 /*
  * $Log$
+ * Revision 1.11  2004/08/03 15:53:17  aleph
+ * Fix spacing
+ *
+ * Revision 1.10  2004/08/02 20:20:29  aleph
+ * Merge from project_ks
+ *
+ * Revision 1.9  2004/07/22 02:01:14  bernie
+ * Use TIMER_PRESCALER consistently.
+ *
+ * Revision 1.8  2004/07/20 23:50:20  bernie
+ * Also define TIMER_PRESCALER.
+ *
  * Revision 1.7  2004/07/20 23:49:40  bernie
  * Compute value of OCR_DIVISOR from CLOCK_FREQ.
  *
@@ -49,7 +61,10 @@
 #endif
 
 
-#define timer_hw_irq()  /* Not needed, IRQ timer flag cleared automatically */
+/* Not needed, IRQ timer flag cleared automatically */
+#define timer_hw_irq() do {} while (0)
+
+#define TIMER_PRESCALER 64
 
 /*!
  * System timer: additional division after the prescaler
@@ -72,10 +87,15 @@
 		TIFR = BV(OCF0) | BV(TOV0);
 
 		/* Setup Timer/Counter interrupt */
-		ASSR = 0x00;                  /* internal system clock */
-		TCCR0 = BV(WGM01) | BV(CS02); /* Clear on Compare match & prescaler = 64. When changing
-		                                 prescaler change TIMER_HW_HPTICKS_PER_SEC too */
-		TCNT0 = 0x00;                 /* initialization of Timer/Counter */
+		ASSR = 0x00;                  /* Internal system clock */
+		TCCR0 = BV(WGM01)             /* Clear on Compare match */
+			#if TIMER_PRESCALER == 64
+				| BV(CS02)
+			#else
+				#error Unsupported value of TIMER_PRESCALER
+			#endif
+		;
+		TCNT0 = 0x00;                 /* Initialization of Timer/Counter */
 		OCR0 = OCR_DIVISOR;           /* Timer/Counter Output Compare Register */
 
 		/* Enable timer interrupts: Timer/Counter2 Output Compare (OCIE2) */
@@ -86,7 +106,7 @@
 	}
 
 	//! Frequency of the hardware high precision timer
-	#define TIMER_HW_HPTICKS_PER_SEC  (CLOCK_FREQ / 64)
+	#define TIMER_HW_HPTICKS_PER_SEC  (CLOCK_FREQ / TIMER_PRESCALER)
 
 	INLINE hptime_t timer_hw_hpread(void)
 	{
@@ -143,7 +163,13 @@
 		TIFR = BV(OCF2) | BV(TOV2);
 
 		/* Setup Timer/Counter interrupt */
-		TCCR2 = BV(WGM21) | BV(CS21) | BV(CS20);
+		TCCR2 = BV(WGM21)
+			#if TIMER_PRESCALER == 64
+				| BV(CS21) | BV(CS20)
+			#else
+				#error Unsupported value of TIMER_PRESCALER
+			#endif
+		;
 		/* Clear on Compare match & prescaler = 64, internal sys clock.
 		   When changing prescaler change TIMER_HW_HPTICKS_PER_SEC too */
 		TCNT2 = 0x00;         /* initialization of Timer/Counter */
@@ -157,7 +183,7 @@
 	}
 
 	//! Frequency of the hardware high precision timer
-	#define TIMER_HW_HPTICKS_PER_SEC  (CLOCK_FREQ / 64)
+	#define TIMER_HW_HPTICKS_PER_SEC  (CLOCK_FREQ / TIMER_PRESCALER)
 
 	INLINE hptime_t timer_hw_hpread(void)
 	{