70 lines
1.9 KiB
C
70 lines
1.9 KiB
C
/*
|
|
* File : cputime_cortexm.c
|
|
* This file is part of RT-Thread RTOS
|
|
* COPYRIGHT (C) 2017, RT-Thread Development Team
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with this program; if not, write to the Free Software Foundation, Inc.,
|
|
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
|
|
*
|
|
* Change Logs:
|
|
* Date Author Notes
|
|
* 2017-12-23 Bernard first version
|
|
*/
|
|
|
|
#include <rthw.h>
|
|
#include <rtdevice.h>
|
|
#include <rtthread.h>
|
|
|
|
#include <board.h>
|
|
|
|
/* Use Cycle counter of Data Watchpoint and Trace Register for CPU time */
|
|
|
|
static float cortexm_cputime_getres(void)
|
|
{
|
|
float ret = 1000 * 1000 * 1000;
|
|
|
|
ret = ret / SystemCoreClock;
|
|
return ret;
|
|
}
|
|
|
|
static uint32_t cortexm_cputime_gettime(void)
|
|
{
|
|
return DWT->CYCCNT;
|
|
}
|
|
|
|
const static struct rt_clock_cputime_ops _cortexm_ops =
|
|
{
|
|
cortexm_cputime_getres,
|
|
cortexm_cputime_gettime
|
|
};
|
|
|
|
int cortexm_cputime_init(void)
|
|
{
|
|
/* check support bit */
|
|
if ((DWT->CTRL & (1UL << DWT_CTRL_NOCYCCNT_Pos)) == 0)
|
|
{
|
|
/* whether cycle counter not enabled */
|
|
if ((DWT->CTRL & (1UL << DWT_CTRL_CYCCNTENA_Pos)) == 0)
|
|
{
|
|
/* enable cycle counter */
|
|
DWT->CTRL |= (1UL << DWT_CTRL_CYCCNTENA_Pos);
|
|
}
|
|
|
|
clock_cpu_setops(&_cortexm_ops);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
INIT_BOARD_EXPORT(cortexm_cputime_init);
|