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