Changeset c35e9622 in rtems for c/src/lib/libbsp/i386/go32/timer/timer.c

Timestamp:

07/24/95 15:43:17 (28 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

3d3a3590

Parents:

2f2a597

Message:

times reported reasonably correctly

File:

• c/src/lib/libbsp/i386/go32/timer/timer.c (modified) (3 diffs)

c/src/lib/libbsp/i386/go32/timer/timer.c

@@ -36 +36 @@
 }
 #else
+#define US_PER_ISR  250
 extern rtems_isr timerisr();
 static rtems_isr_entry Old_Ticker;
@@ -84 +85 @@
             continue;
 
-        /* load timer for 250 microsecond period */
+        /* load timer for US_PER_ISR microsecond period */
         outport_byte( TIMER_MODE, TIMER_SEL0|TIMER_16BIT|TIMER_RATEGEN );
-        outport_byte( TIMER_CNTR0, US_TO_TICK(250) >> 0 & 0xff );
-        outport_byte( TIMER_CNTR0, US_TO_TICK(250) >> 8 & 0xff );
+        outport_byte( TIMER_CNTR0, US_TO_TICK(US_PER_ISR) >> 0 & 0xff );
+        outport_byte( TIMER_CNTR0, US_TO_TICK(US_PER_ISR) >> 8 & 0xff );
 #endif /* PENTIUM */
     }
@@ -118 +119 @@
     inport_byte( TIMER_CNTR0, msb );
     clicks = msb << 8 | lsb;
-    total = Ttimer_val + 250 - TICK_TO_US( clicks );
+    total = (Ttimer_val * US_PER_ISR) + (US_PER_ISR - TICK_TO_US( clicks ));
 #endif /* pentium */