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2006-03-07 Lars Munch <lars@segv.dk>

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* at91rm9200/clock/clock.c: The clock tick is not very precise on
	at91rm9200. The attached patch improves the situation by:
	  (1) Not reloading the "period interval timer" register in the
	      interrupt handler since this is done automatically.
	  (2) Use integer rounding in the calculation of the "period interval
	      timer" register value to get as close as posible to the
	      CONFIGURE_MICROSECONDS_PER_TICK value.
This commit is contained in:
Joel Sherrill
2006-03-07 21:05:28 +00:00
parent d3490f2756
commit 75bf564ba1
2 changed files with 11 additions and 4 deletions
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10
c/src/lib/libcpu/arm/ChangeLog
View File

@@ -1,3 +1,13 @@
2006-03-07 Lars Munch <lars@segv.dk>
* at91rm9200/clock/clock.c: The clock tick is not very precise on
at91rm9200. The attached patch improves the situation by:
(1) Not reloading the "period interval timer" register in the
interrupt handler since this is done automatically.
(2) Use integer rounding in the calculation of the "period interval
timer" register value to get as close as posible to the
CONFIGURE_MICROSECONDS_PER_TICK value.
2005-11-04 Ralf Corsepius <ralf.corsepius@rtems.org>
* configure.ac: Remove RTEMS_CHECK_CUSTOM_BSP.

5
c/src/lib/libcpu/arm/at91rm9200/clock/clock.c
View File

@@ -54,9 +54,6 @@ rtems_isr clock_isr(rtems_vector_number vector)
/* read the status to clear the int */
st_str = ST_REG(ST_SR);
/* reload the timer value */
ST_REG(ST_PIMR) = st_pimr_reload;
rtems_clock_tick();
}
@@ -71,7 +68,7 @@ void Install_clock(rtems_isr_entry clock_isr)
/* the system timer is driven from SLCK */
slck = at91rm9200_get_slck();
st_pimr_reload = ((BSP_Configuration.microseconds_per_tick * slck) /
st_pimr_reload = (((BSP_Configuration.microseconds_per_tick * slck) + (1000000/2))/
1000000);
/* read the status to clear the int */