diff options
| -rw-r--r-- | c/src/lib/libcpu/arm/ChangeLog | 10 | ||||
| -rw-r--r-- | c/src/lib/libcpu/arm/at91rm9200/clock/clock.c | 5 |
2 files changed, 11 insertions, 4 deletions
diff --git a/c/src/lib/libcpu/arm/ChangeLog b/c/src/lib/libcpu/arm/ChangeLog index ca9ebc86e6..cd5211cc03 100644 --- a/c/src/lib/libcpu/arm/ChangeLog +++ b/c/src/lib/libcpu/arm/ChangeLog @@ -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. diff --git a/c/src/lib/libcpu/arm/at91rm9200/clock/clock.c b/c/src/lib/libcpu/arm/at91rm9200/clock/clock.c index 5bba53c101..c6876c2aa6 100644 --- a/c/src/lib/libcpu/arm/at91rm9200/clock/clock.c +++ b/c/src/lib/libcpu/arm/at91rm9200/clock/clock.c @@ -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 */ |