Changeset 1690c6b in rtems for c/src/lib/libbsp/i386

Timestamp:

07/21/95 20:10:49 (28 years ago)

Author:

Joel Sherrill <joel.sherrill@…>

Branches:

4.10, 4.11, 4.8, 4.9, 5, master

Children:

2f2a597

Parents:

9e738b65

Message:

after testing go32 and cvme961

Location:

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

Files:

• timer.c (modified) (3 diffs)
• timerisr.s (modified) (1 diff)

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

@@ -41 +41 @@
 #else /* pentium */
 rtems_isr timerisr();
+
+#define TIMER_ISR_US  10000
+
 #endif /* pentium */
 
@@ -75 +78 @@
        WAIT();
 
-       /* load timer for 250 microsecond period */
+       /* load timer for TIMER_ISR_US 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(TIMER_ISR_US) >> 0 & 0xff);
+       outport_byte( TIMER_CNTR0, US_TO_TICK(TIMER_ISR_US) >> 8 & 0xff);
     }
 
@@ -102 +105 @@
     inport_byte( TIMER_CNTR0, msb );
     clicks = msb << 8 | lsb;
-    total = Ttimer_val + (250 - TICK_TO_US( clicks ));
+    total = (Ttimer_val * TIMER_ISR_US) + (TIMER_ISR_US - TICK_TO_US( clicks ));
 #endif /* pentium */
 

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

@@ -28 +28 @@
 
 SYM (timerisr): 
-        addl    $250,_Ttimer_val   # another 250 microseconds
+        addl    $1,_Ttimer_val   # another tick
         push    edx
         push    eax