RTOS/rtems
1
0
Fork 0
forked from Imagelibrary/rtems
Code Pull Requests Activity

2001-01-12 Joel Sherrill <joel@OARcorp.com>

Browse Source 
* include/bsp.h, timer/timer.c: Updated so timer appears to
	work and support tm27.  I would prefer to time a software
	interrupt rather than an use an extra timer though.
This commit is contained in:
Joel Sherrill
2001-01-12 13:28:27 +00:00
parent 3e7e859428
commit 4d6b3b66e1
3 changed files with 46 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files

22
c/src/lib/libbsp/mips/jmr3904/timer/timer.c
View File

@@ -26,21 +26,21 @@ void Timer_initialize()
* it run long enough and accurate enough not to require an interrupt.
* but if it ever does generate an interrupt, we will simply fault.
*
* NOTE: This is identical to the clock driver initialization
* NOTE: This is similar to the clock driver initialization
* with the exception that the divider is disabled and
* the compare register is set to the maximum value.
*/
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_CCDR, 0x3 );
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_TRR, 0x0 );
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_CPRA, 0xFFFFFFFF );
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_TISR, 0x00 );
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_ITMR, 0x8001 );
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_TCR, 0xc0 );
*((volatile unsigned32 *) 0xFFFFC01C) = 0x00000700;
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_CCDR, 0x3 );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_TRR, 0x0 );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_CPRA, 0xFFFFFFFF );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_TISR, 0x00 );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_ITMR, 0x8001 );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_TCR, 0x20 );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_TCR, 0xe0 );
}
#define AVG_OVERHEAD 0 /* It typically takes 24 instructions */
#define AVG_OVERHEAD 0 /* It typically takes N instructions */
/* to start/stop the timer. */
#define LEAST_VALID 1 /* Don't trust a value lower than this */
/* tx39 simulator can count instructions. :) */
@@ -49,8 +49,8 @@ int Read_timer()
{
rtems_unsigned32 total;
TX3904_TIMER_WRITE( TX3904_TIMER0_BASE, TX3904_TIMER_TCR, 0x03 );
total = TX3904_TIMER_READ( TX3904_TIMER0_BASE, TX3904_TIMER_TRR );
TX3904_TIMER_WRITE( TX3904_TIMER1_BASE, TX3904_TIMER_TCR, 0x03 );
total = TX3904_TIMER_READ( TX3904_TIMER1_BASE, TX3904_TIMER_TRR );
if ( Timer_driver_Find_average_overhead == 1 )
return total; /* in one microsecond units */