1 | /* |
---|
2 | * Copyright (c) 2011, 2018 Sebastian Huber. All rights reserved. |
---|
3 | * |
---|
4 | * embedded brains GmbH |
---|
5 | * Dornierstr. 4 |
---|
6 | * 82178 Puchheim |
---|
7 | * Germany |
---|
8 | * <rtems@embedded-brains.de> |
---|
9 | * |
---|
10 | * The license and distribution terms for this file may be |
---|
11 | * found in the file LICENSE in this distribution or at |
---|
12 | * http://www.rtems.org/license/LICENSE. |
---|
13 | */ |
---|
14 | |
---|
15 | #ifndef BSP_CLOCK_ARMV7M_H |
---|
16 | #define BSP_CLOCK_ARMV7M_H |
---|
17 | |
---|
18 | #include <rtems/score/armv7m.h> |
---|
19 | #include <rtems/timecounter.h> |
---|
20 | |
---|
21 | #include <bsp.h> |
---|
22 | |
---|
23 | #ifdef __cplusplus |
---|
24 | extern "C" { |
---|
25 | #endif /* __cplusplus */ |
---|
26 | |
---|
27 | #ifdef ARM_MULTILIB_ARCH_V7M |
---|
28 | |
---|
29 | typedef struct { |
---|
30 | struct timecounter base; |
---|
31 | uint32_t ticks; |
---|
32 | } ARMV7M_Timecounter; |
---|
33 | |
---|
34 | extern ARMV7M_Timecounter _ARMV7M_TC; |
---|
35 | |
---|
36 | static inline uint32_t _ARMV7M_Clock_frequency(void) |
---|
37 | { |
---|
38 | #ifdef BSP_ARMV7M_SYSTICK_FREQUENCY |
---|
39 | return BSP_ARMV7M_SYSTICK_FREQUENCY; |
---|
40 | #else |
---|
41 | volatile ARMV7M_Systick *systick = _ARMV7M_Systick; |
---|
42 | return ARMV7M_SYSTICK_CALIB_TENMS_GET(systick->calib) * 100; |
---|
43 | #endif |
---|
44 | } |
---|
45 | |
---|
46 | static uint32_t _ARMV7M_Clock_counter(ARMV7M_Timecounter *tc) |
---|
47 | { |
---|
48 | volatile ARMV7M_Systick *systick; |
---|
49 | rtems_interrupt_level level; |
---|
50 | uint32_t interval; |
---|
51 | uint32_t counter; |
---|
52 | uint32_t ticks; |
---|
53 | uint32_t csr; |
---|
54 | |
---|
55 | rtems_interrupt_disable(level); |
---|
56 | systick = _ARMV7M_Systick; |
---|
57 | counter = systick->cvr; |
---|
58 | csr = systick->csr; |
---|
59 | interval = systick->rvr; |
---|
60 | ticks = tc->ticks; |
---|
61 | |
---|
62 | if (RTEMS_PREDICT_FALSE((csr & ARMV7M_SYSTICK_CSR_COUNTFLAG) != 0)) { |
---|
63 | counter = systick->cvr; |
---|
64 | ticks += interval; |
---|
65 | tc->ticks = ticks; |
---|
66 | } |
---|
67 | |
---|
68 | counter = interval - counter + ticks; |
---|
69 | rtems_interrupt_enable(level); |
---|
70 | |
---|
71 | return counter; |
---|
72 | } |
---|
73 | |
---|
74 | #endif /* ARM_MULTILIB_ARCH_V7M */ |
---|
75 | |
---|
76 | #ifdef __cplusplus |
---|
77 | } |
---|
78 | #endif /* __cplusplus */ |
---|
79 | |
---|
80 | #endif /* BSP_CLOCK_ARMV7M_H */ |
---|