blob: 16e971f85ad67e828bb00b7a75115b07cd16efd7 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
|
/*
* Copyright (c) 2016 embedded brains GmbH. All rights reserved.
*
* embedded brains GmbH
* Dornierstr. 4
* 82178 Puchheim
* Germany
* <rtems@embedded-brains.de>
*
* 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.
*/
#include <rtems/score/armv7m.h>
#include <rtems/counter.h>
#include <rtems/sysinit.h>
#include <bsp.h>
#include <bsp/fatal.h>
CPU_Counter_ticks _CPU_Counter_read(void)
{
volatile ARMV7M_DWT *dwt = _ARMV7M_DWT;
return dwt->cyccnt;
}
static void armv7m_cpu_counter_initialize(void)
{
volatile ARMV7M_DWT *dwt = _ARMV7M_DWT;
uint32_t dwt_ctrl;
dwt_ctrl = dwt->ctrl;
if ((dwt_ctrl & ARMV7M_DWT_CTRL_NOCYCCNT) == 0) {
#ifdef BSP_ARMV7M_SYSTICK_FREQUENCY
uint64_t freq = BSP_ARMV7M_SYSTICK_FREQUENCY;
#else
volatile ARMV7M_Systick *systick = _ARMV7M_Systick;
uint64_t freq = ARMV7M_SYSTICK_CALIB_TENMS_GET(systick->calib) * 100ULL;
#endif
dwt->ctrl = dwt_ctrl | ARMV7M_DWT_CTRL_CYCCNTENA;
rtems_counter_initialize_converter(freq);
} else {
bsp_fatal(BSP_ARM_ARMV7M_CPU_COUNTER_INIT);
}
}
RTEMS_SYSINIT_ITEM(
armv7m_cpu_counter_initialize,
RTEMS_SYSINIT_BSP_START,
RTEMS_SYSINIT_ORDER_FIRST
);
|
