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os_sys_time.c
1
2//=======================================================================================================
3// @file os_sys_time.c
4//
5// @brief contains the function for the system time
6//
7// @note counting up the time can/should be done in the interrupt routine of the scheduler
8// reading the time can also be done outside of the interrupt without any conflicts
9//
10// @author M52409
11//
12// @date 2019-08-09
13//=======================================================================================================
14
15#include <string.h>
16#include "os/os_sys_time.h"
17#include "os_config.h"
18
19#if OS_USE_SYSTIME == 1
20
21static volatile OS_SYSTIME_t os_systime;
22
23//=======================================================================================================
24// @brief call this function every millisecond from the interrupt in your scheduler
25//=======================================================================================================
26void OS_SysTime_IncrementTime_1ms(void)
27{
28 if (os_systime.millisecond < 999U)
29 {
30 os_systime.millisecond++;
31 }
32 else
33 {
34 os_systime.millisecond = 0U;
35 if (os_systime.second < 59U)
36 {
37 os_systime.second++;
38 }
39 else
40 {
41 os_systime.second = 0U;
42 if (os_systime.minute < 59U)
43 {
44 os_systime.minute++;
45 }
46 else
47 {
48 os_systime.minute = 0U;
49 if (os_systime.hour < 23U)
50 {
51 os_systime.hour++;
52 }
53 else
54 {
55 os_systime.hour = 0U;
56 }
57 }
58 }
59 }
60}
61
62
63//=======================================================================================================
64// @brief function to reset the time to zero
65// @ note use this function at boot up time or in the init function of your scheduler or
66// whenever you want to set the system time to zero
67//=======================================================================================================
68void OS_SysTime_ResetTime(void)
69{
70 os_systime.millisecond = 0U; //starting with milliseconds is important for consistency
71 os_systime.second = 0U;
72 os_systime.minute = 0U;
73 os_systime.hour = 0U;
74}
75
76
77//=======================================================================================================
78// @brief get the time now
79// @ note use this function to get a copy of the system time
80//=======================================================================================================
81void OS_SysTime_GetTime(OS_SYSTIME_t* retVal)
82{
83 /* LDRA_EXCLUDE 45 D */
84 /* The void* returned by memcpy is not required in this function */
85 /* LDRA_EXCLUDE 382 S */
86 memcpy (retVal, (void*) &os_systime, sizeof(OS_SYSTIME_t));
87 // if the 1ms interrupt changed the system time during this copy operation, the copy is not valid
88 // so we have to check for that with a simple while loop and copy again in such a case
89 /* We are comparing the right sizes between the structure pointers and the
90 return from memcmp is an int, which is being rightly checked*/
91 /* LDRA_EXCLUDE 618 S */
92 /* LDRA_EXCLUDE 114 S */
93 while (memcmp(retVal, (void*) &os_systime, sizeof(OS_SYSTIME_t) != 0U))
94 {
95 /* LDRA_EXCLUDE 382 S */
96 memcpy (retVal, (void*) &os_systime, sizeof(OS_SYSTIME_t));
97 }
98}
99
100#endif //OS_USE_SYSTIME
OS_SYSTIME_t
Definition os_sys_time.h:26
OS_SYSTIME_t::millisecond
uint16_t millisecond
Definition os_sys_time.h:27
OS_SYSTIME_t::second
uint8_t second
Definition os_sys_time.h:28
OS_SYSTIME_t::minute
uint8_t minute
Definition os_sys_time.h:29
OS_SYSTIME_t::hour
uint8_t hour
Definition os_sys_time.h:30