diff options
| author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2001-01-22 14:11:09 +0000 |
|---|---|---|
| committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2001-01-22 14:11:09 +0000 |
| commit | 4dd1aa53ed40bdb6fabcf0fca470a27e20c8a568 (patch) | |
| tree | 585a4889ed374bb371d1180d8605a71936f2617b /c/src/lib/libcpu | |
| parent | 2001-01-22 Ralf Corsepius <corsepiu@faw.uni-ulm.de> (diff) | |
| download | rtems-4dd1aa53ed40bdb6fabcf0fca470a27e20c8a568.tar.bz2 | |
2001-01-22 Radzislaw Galler <rgaller@et.put.poznan.pl>
* clock/ckinit.c (Install_clock): Modified MTU timer 0 initialization
to generate an interrupt exactly every 1us
Diffstat (limited to 'c/src/lib/libcpu')
| -rw-r--r-- | c/src/lib/libcpu/sh/sh7045/ChangeLog | 5 | ||||
| -rw-r--r-- | c/src/lib/libcpu/sh/sh7045/clock/ckinit.c | 16 |
2 files changed, 14 insertions, 7 deletions
diff --git a/c/src/lib/libcpu/sh/sh7045/ChangeLog b/c/src/lib/libcpu/sh/sh7045/ChangeLog index 3ad6d6c5c2..2ec7b10031 100644 --- a/c/src/lib/libcpu/sh/sh7045/ChangeLog +++ b/c/src/lib/libcpu/sh/sh7045/ChangeLog @@ -1,3 +1,8 @@ +2001-01-22 Radzislaw Galler <rgaller@et.put.poznan.pl> + + * clock/ckinit.c (Install_clock): Modified MTU timer 0 initialization + to generate an interrupt exactly every 1us + 2001-01-05 Joel Sherrill <joel@OARcorp.com> * /dev/null moved to libmisc. diff --git a/c/src/lib/libcpu/sh/sh7045/clock/ckinit.c b/c/src/lib/libcpu/sh/sh7045/clock/ckinit.c index 9e9278c24c..c37c8ce7cd 100644 --- a/c/src/lib/libcpu/sh/sh7045/clock/ckinit.c +++ b/c/src/lib/libcpu/sh/sh7045/clock/ckinit.c @@ -44,7 +44,7 @@ #include <rtems/score/ispsh7045.h> #include <rtems/score/iosh7045.h> -#define _MTU_COUNTER0_MICROSECOND (Clock_MHZ/4) +#define _MTU_COUNTER0_MICROSECOND (Clock_MHZ/16) #ifndef CLOCKPRIO #define CLOCKPRIO 10 @@ -53,7 +53,7 @@ #define MTU0_STARTMASK 0xfe #define MTU0_SYNCMASK 0xfe #define MTU0_MODEMASK 0xc0 -#define MTU0_TCRMASK 0x01 /* bit 7 also used, vs 703x */ +#define MTU0_TCRMASK 0x22 /* bit 7 also used, vs 703x */ #define MTU0_STAT_MASK 0xc0 #define MTU0_IRQMASK 0xfe #define MTU0_TIERMASK 0x01 @@ -150,6 +150,8 @@ void Install_clock( ) { unsigned8 temp8 = 0; + unsigned32 factor = 1000000; + /* * Initialize the clock tick device driver variables @@ -158,8 +160,9 @@ void Install_clock( Clock_driver_ticks = 0; Clock_isrs_const = rtems_configuration_get_microseconds_per_tick() / 10000; Clock_isrs = Clock_isrs_const; - - Clock_MHZ = rtems_cpu_configuration_get_clicks_per_second() / 1000000 ; + + factor /= rtems_configuration_get_microseconds_per_tick(); /* minimalization of integer division error */ + Clock_MHZ = rtems_cpu_configuration_get_clicks_per_second() / factor ; rtems_interrupt_catch( Clock_isr, CLOCK_VECTOR, &Old_ticker ); @@ -182,7 +185,7 @@ void Install_clock( temp8 = read8( MTU_TMDR0) & MTU0_MODEMASK; write8( temp8, MTU_TMDR0); - /* TCNT is cleared by GRA ; internal clock /4 */ + /* TCNT is cleared by GRA ; internal clock /16 */ write8( MTU0_TCRMASK , MTU_TCR0); /* use GRA without I/O - pins */ @@ -201,8 +204,7 @@ void Install_clock( rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED); /* set counter limits */ - write16( _MTU_COUNTER0_MICROSECOND * - rtems_configuration_get_microseconds_per_tick(), MTU_GR0A); + write16( _MTU_COUNTER0_MICROSECOND, MTU_GR0A); /* start counter */ temp8 = read8( MTU_TSTR) |~MTU0_STARTMASK; |