xref: /nrf52832-nimble/rt-thread/components/drivers/rtc/soft_rtc.c (revision 042d53a763ad75cb1465103098bb88c245d95138)
1 /*
2  * Copyright (c) 2006-2018, RT-Thread Development Team
3  *
4  * SPDX-License-Identifier: Apache-2.0
5  *
6  * Change Logs:
7  * Date           Author       Notes
8  * 2018-01-30     armink       the first version
9  */
10 
11 #include <time.h>
12 #include <string.h>
13 #include <rtthread.h>
14 
15 #include <drivers/rtc.h>
16 
17 #ifdef RT_USING_SOFT_RTC
18 
19 /* 2018-01-30 14:44:50 = RTC_TIME_INIT(2018, 1, 30, 14, 44, 50)  */
20 #define RTC_TIME_INIT(year, month, day, hour, minute, second)        \
21     {.tm_year = year - 1900, .tm_mon = month - 1, .tm_mday = day, .tm_hour = hour, .tm_min = minute, .tm_sec = second}
22 
23 #ifndef SOFT_RTC_TIME_DEFAULT
24 #define SOFT_RTC_TIME_DEFAULT                    RTC_TIME_INIT(2018, 1, 1, 0, 0 ,0)
25 #endif
26 
27 static struct rt_device soft_rtc_dev;
28 static rt_tick_t init_tick;
29 static time_t init_time;
30 
31 static rt_err_t soft_rtc_control(rt_device_t dev, int cmd, void *args)
32 {
33     time_t *time;
34     struct tm time_temp;
35 
36     RT_ASSERT(dev != RT_NULL);
37     memset(&time_temp, 0, sizeof(struct tm));
38 
39     switch (cmd)
40     {
41     case RT_DEVICE_CTRL_RTC_GET_TIME:
42         time = (time_t *) args;
43         *time = init_time + (rt_tick_get() - init_tick) / RT_TICK_PER_SECOND;
44         break;
45 
46     case RT_DEVICE_CTRL_RTC_SET_TIME:
47     {
48         time = (time_t *) args;
49         init_time = *time - (rt_tick_get() - init_tick) / RT_TICK_PER_SECOND;
50         break;
51     }
52     }
53 
54     return RT_EOK;
55 }
56 
57 #ifdef RT_USING_DEVICE_OPS
58 const static struct rt_device_ops soft_rtc_ops =
59 {
60     RT_NULL,
61     RT_NULL,
62     RT_NULL,
63     RT_NULL,
64     RT_NULL,
65     soft_rtc_control
66 };
67 #endif
68 
69 int rt_soft_rtc_init(void)
70 {
71     static rt_bool_t init_ok = RT_FALSE;
72     struct tm time_new = SOFT_RTC_TIME_DEFAULT;
73 
74     if (init_ok)
75     {
76         return 0;
77     }
78     /* make sure only one 'rtc' device */
79     RT_ASSERT(!rt_device_find("rtc"));
80 
81     init_tick = rt_tick_get();
82     init_time = mktime(&time_new);
83 
84     soft_rtc_dev.type    = RT_Device_Class_RTC;
85 
86     /* register rtc device */
87 #ifdef RT_USING_DEVICE_OPS
88     soft_rtc_dev.ops     = &soft_rtc_ops;
89 #else
90     soft_rtc_dev.init    = RT_NULL;
91     soft_rtc_dev.open    = RT_NULL;
92     soft_rtc_dev.close   = RT_NULL;
93     soft_rtc_dev.read    = RT_NULL;
94     soft_rtc_dev.write   = RT_NULL;
95     soft_rtc_dev.control = soft_rtc_control;
96 #endif
97 
98     /* no private */
99     soft_rtc_dev.user_data = RT_NULL;
100 
101     rt_device_register(&soft_rtc_dev, "rtc", RT_DEVICE_FLAG_RDWR);
102 
103     init_ok = RT_TRUE;
104 
105     return 0;
106 }
107 INIT_DEVICE_EXPORT(rt_soft_rtc_init);
108 
109 #endif /* RT_USING_SOFT_RTC */
110