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author | Joel Sherrill <joel.sherrill@OARcorp.com> | 2001-05-25 16:28:46 +0000 |
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committer | Joel Sherrill <joel.sherrill@OARcorp.com> | 2001-05-25 16:28:46 +0000 |
commit | 332484b52e06e5ee8318297610ffa472a4087da8 (patch) | |
tree | bd9d988742a26002e6efff4c2c3383afef0a816c /c/src/lib/libbsp/m68k/mrm332/timer/timer.c | |
parent | 2000-05-25 Matt Cross <profesor@gweep.net> (diff) | |
download | rtems-332484b52e06e5ee8318297610ffa472a4087da8.tar.bz2 |
2000-05-25 Matt Cross <profesor@gweep.net>
* New MRM332 BSP for the Mini RoboMind board based
on the 68332 microcontroller designed and build by Mark
Castelluccio. For details on the MRM see http://www.robominds.com.
* .cvsignore, ChangeLog Makefile.am, README, bsp_specs,
clock/.cvsignore, clock/Makefile.am, clock/ckinit.c, configure.in,
console/.cvsignore, console/Makefile.am, console/console.c,
include/.cvsignore, include/Makefile.am, include/bsp.h,
include/mrm332.h, misc/dotests, misc/gdbinit68, misc/interr.c,
spurious/.cvsignore, spurious/Makefile.am, spurious/spinit.c,
start/.cvsignore, start/Makefile.am, start/start.c, startup/.cvsignore,
startup/Makefile.am, startup/bspclean.c, startup/bspstart.c,
startup/except_vect_332_ROM.S, startup/linkcmds, startup/linkcmds_ROM,
timer/.cvsignore, timer/Makefile.am, timer/timer.c, times,
wrapup/.cvsignore, wrapup/Makefile.am: Initial files.
Diffstat (limited to 'c/src/lib/libbsp/m68k/mrm332/timer/timer.c')
-rw-r--r-- | c/src/lib/libbsp/m68k/mrm332/timer/timer.c | 83 |
1 files changed, 83 insertions, 0 deletions
diff --git a/c/src/lib/libbsp/m68k/mrm332/timer/timer.c b/c/src/lib/libbsp/m68k/mrm332/timer/timer.c new file mode 100644 index 0000000000..7fa8f3b718 --- /dev/null +++ b/c/src/lib/libbsp/m68k/mrm332/timer/timer.c @@ -0,0 +1,83 @@ +/* Timer_init() + * + * This routine initializes a timer in efi68k's DP8570A TCP + * + * Input parameters: NONE + * + * Output parameters: NONE + * + * NOTE: It is important that the timer start/stop overhead be + * determined when porting or modifying this code. + * + * COPYRIGHT (c) 1989-1999. + * On-Line Applications Research Corporation (OAR). + * + * The license and distribution terms for this file may be + * found in the file LICENSE in this distribution or at + * http://www.OARcorp.com/rtems/license.html. + * + * $Id$ + */ + + +#include <bsp.h> + +rtems_boolean Timer_driver_Find_average_overhead; + +extern rtems_isr Clock_isr(); + +void Timer_initialize( void ) +{ +} + +/* + * The following controls the behavior of Read_timer(). + * + * FIND_AVG_OVERHEAD * instructs the routine to return the "raw" count. + * + * AVG_OVEREHAD is the overhead for starting and stopping the timer. It + * is usually deducted from the number returned. + * + * LEAST_VALID is the lowest number this routine should trust. Numbers + * below this are "noise" and zero is returned. + */ + +#define AVG_OVERHEAD 0 /* It typically takes X.X microseconds */ + /* (Y countdowns) to start/stop the timer. */ + /* This value is in microseconds. */ +#define LEAST_VALID 1 /* Don't trust a clicks value lower than this */ + +/* + * Return timer value in 1/2-microsecond units + */ +int Read_timer( void ) +{ + rtems_unsigned32 total; + total = 0; + + if ( Timer_driver_Find_average_overhead == 1 ) + return total; /* in XXX microsecond units */ + + if ( total < LEAST_VALID ) + return 0; /* below timer resolution */ + + return (total - AVG_OVERHEAD); +} + + +/* + * Empty function call used in loops to measure basic cost of looping + * in Timing Test Suite. + */ + +rtems_status_code Empty_function(void) +{ + return RTEMS_SUCCESSFUL; +} + +void Set_find_average_overhead( + rtems_boolean find_flag +) +{ + Timer_driver_Find_average_overhead = find_flag; +} |