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2001-01-22 Radzislaw Galler <rgaller@et.put.poznan.pl>

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* clock/ckinit.c (Install_clock): Modified MTU timer 0 initialization
	to generate an interrupt exactly every 1us
This commit is contained in:
Joel Sherrill
2001-01-22 14:11:09 +00:00
parent d6b1d73bc7
commit 4dd1aa53ed
2 changed files with 14 additions and 7 deletions
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5
c/src/lib/libcpu/sh/sh7045/ChangeLog
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@@ -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> 2001-01-05 Joel Sherrill <joel@OARcorp.com>
* /dev/null moved to libmisc. * /dev/null moved to libmisc.

16
c/src/lib/libcpu/sh/sh7045/clock/ckinit.c
View File

@@ -44,7 +44,7 @@
#include <rtems/score/ispsh7045.h> #include <rtems/score/ispsh7045.h>
#include <rtems/score/iosh7045.h> #include <rtems/score/iosh7045.h>
#define _MTU_COUNTER0_MICROSECOND (Clock_MHZ/4) #define _MTU_COUNTER0_MICROSECOND (Clock_MHZ/16)
#ifndef CLOCKPRIO #ifndef CLOCKPRIO
#define CLOCKPRIO 10 #define CLOCKPRIO 10
@@ -53,7 +53,7 @@
#define MTU0_STARTMASK 0xfe #define MTU0_STARTMASK 0xfe
#define MTU0_SYNCMASK 0xfe #define MTU0_SYNCMASK 0xfe
#define MTU0_MODEMASK 0xc0 #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_STAT_MASK 0xc0
#define MTU0_IRQMASK 0xfe #define MTU0_IRQMASK 0xfe
#define MTU0_TIERMASK 0x01 #define MTU0_TIERMASK 0x01
@@ -150,6 +150,8 @@ void Install_clock(
) )
{ {
unsigned8 temp8 = 0; unsigned8 temp8 = 0;
unsigned32 factor = 1000000;
/* /*
* Initialize the clock tick device driver variables * Initialize the clock tick device driver variables
@@ -158,8 +160,9 @@ void Install_clock(
Clock_driver_ticks = 0; Clock_driver_ticks = 0;
Clock_isrs_const = rtems_configuration_get_microseconds_per_tick() / 10000; Clock_isrs_const = rtems_configuration_get_microseconds_per_tick() / 10000;
Clock_isrs = Clock_isrs_const; 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 ); rtems_interrupt_catch( Clock_isr, CLOCK_VECTOR, &Old_ticker );
@@ -182,7 +185,7 @@ void Install_clock(
temp8 = read8( MTU_TMDR0) & MTU0_MODEMASK; temp8 = read8( MTU_TMDR0) & MTU0_MODEMASK;
write8( temp8, MTU_TMDR0); 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); write8( MTU0_TCRMASK , MTU_TCR0);
/* use GRA without I/O - pins */ /* use GRA without I/O - pins */
@@ -201,8 +204,7 @@ void Install_clock(
rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED); rtems_fatal_error_occurred( RTEMS_NOT_CONFIGURED);
/* set counter limits */ /* set counter limits */
write16( _MTU_COUNTER0_MICROSECOND * write16( _MTU_COUNTER0_MICROSECOND, MTU_GR0A);
rtems_configuration_get_microseconds_per_tick(), MTU_GR0A);
/* start counter */ /* start counter */
temp8 = read8( MTU_TSTR) |~MTU0_STARTMASK; temp8 = read8( MTU_TSTR) |~MTU0_STARTMASK;