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|
/*===============================================================*\
| Project: RTEMS generic mcf548x BSP |
+-----------------------------------------------------------------+
| File: timer.c |
+-----------------------------------------------------------------+
| The file contains the diagnostic timer code of generic MCF548x |
| BSP. |
+-----------------------------------------------------------------+
| Copyright (c) 2007 |
| Embedded Brains GmbH |
| Obere Lagerstr. 30 |
| D-82178 Puchheim |
| Germany |
| rtems@embedded-brains.de |
+-----------------------------------------------------------------+
| |
| Parts of the code has been derived from the "dBUG source code" |
| package Freescale is providing for M548X EVBs. The usage of |
| the modified or unmodified code and it's integration into the |
| generic mcf548x BSP has been done according to the Freescale |
| license terms. |
| |
| The Freescale license terms can be reviewed in the file |
| |
| Freescale_license.txt |
| |
+-----------------------------------------------------------------+
| |
| The generic mcf548x BSP has been developed on the basic |
| structures and modules of the av5282 BSP. |
| |
+-----------------------------------------------------------------+
| |
| The license and distribution terms for this file may be |
| found in the file LICENSE in this distribution or at |
| |
| http://www.rtems.org/license/LICENSE. |
| |
+-----------------------------------------------------------------+
| |
| date history ID |
| ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ |
| 12.11.07 1.0 ras |
| |
\*===============================================================*/
/*
* Timer Init
*
* Use the second slice timer (SLT1) as the diagnostic timer.
*/
#include <rtems.h>
#include <rtems/btimer.h>
#include <bsp.h>
#include <mcf548x/mcf548x.h>
bool benchmark_timer_find_average_overhead;
static uint32_t microsecond_timer_value = 0;
void benchmark_timer_initialize(void)
{
MCF548X_SLT_SLTCNT1 = 0xFFFFFFFF;
MCF548X_SLT_SCR1 |= (MCF548X_SLT_SCR_TEN | MCF548X_SLT_SCR_RUN);
}
/*
* Return timer value in microsecond units
* XLB clock 100 MHz / 1us is equal to 100 counts
*/
uint32_t
benchmark_timer_read(void)
{
microsecond_timer_value = (0xFFFFFFFF - MCF548X_SLT_SCNT1)/100;
return microsecond_timer_value;
}
void
benchmark_timer_disable_subtracting_average_overhead(bool find_flag)
{
benchmark_timer_find_average_overhead = find_flag;
}
|
