1 /*
2 * Copyright (c) 2006-2025, RT-Thread Development Team
3 *
4 * SPDX-License-Identifier: Apache-2.0
5 *
6 * Change Logs:
7 * Date Author Notes
8 * 2020-09-08 Chenyingchun first version
9 */
10
11 #include "board.h"
12 #include <rtthread.h>
13 #include <rtdevice.h>
14 #include <sys/time.h>
15 #include <nrfx_rtc.h>
16 #include <nrfx_clock.h>
17
18 #ifdef BSP_USING_ONCHIP_RTC
19
20 #define LOG_TAG "drv.rtc"
21 #define DBG_LVL DBG_LOG
22 #include <rtdbg.h>
23
24 /* 2018-01-30 14:44:50 = RTC_TIME_INIT(2018, 1, 30, 14, 44, 50) */
25 #define RTC_TIME_INIT(year, month, day, hour, minute, second) \
26 {.tm_year = year - 1900, .tm_mon = month - 1, .tm_mday = day, .tm_hour = hour, .tm_min = minute, .tm_sec = second}
27
28 #ifndef ONCHIP_RTC_TIME_DEFAULT
29 #define ONCHIP_RTC_TIME_DEFAULT RTC_TIME_INIT(2018, 1, 1, 0, 0 ,0)
30 #endif
31
32 #ifndef RTC_INSTANCE_ID
33 #define RTC_INSTANCE_ID (2)
34 #endif
35
36 #define TICK_FREQUENCE_HZ (RT_TICK_PER_SECOND) /* RTC tick frequence, in HZ */
37
38 static struct rt_rtc_device rtc;
39 static time_t init_time;
40 static uint32_t tick = 0;
41
rtc_callback(nrfx_rtc_int_type_t int_type)42 static void rtc_callback(nrfx_rtc_int_type_t int_type)
43 {
44 static uint32_t count = 0;
45
46 if (int_type == NRFX_RTC_INT_TICK)
47 {
48 count++;
49 if((count % TICK_FREQUENCE_HZ) == 0)
50 {
51 tick++;
52 }
53 }
54 }
55
rt_rtc_config(struct rt_device * dev)56 static rt_err_t rt_rtc_config(struct rt_device *dev)
57 {
58 #define SYSTICK_CLOCK_HZ (32768UL)
59 #define RTC_PRESCALER ((uint32_t) (NRFX_ROUNDED_DIV(SYSTICK_CLOCK_HZ, TICK_FREQUENCE_HZ) - 1))
60
61 const nrfx_rtc_t rtc_instance = NRFX_RTC_INSTANCE(RTC_INSTANCE_ID);
62 nrf_clock_lf_src_set(NRF_CLOCK, (nrf_clock_lfclk_t)NRFX_CLOCK_CONFIG_LF_SRC);
63 nrfx_clock_lfclk_start();
64
65 /* Initialize RTC instance */
66 nrfx_rtc_config_t config = NRFX_RTC_DEFAULT_CONFIG;
67 config.prescaler = RTC_PRESCALER;
68
69 nrfx_rtc_init(&rtc_instance, &config, rtc_callback);
70
71 nrfx_rtc_tick_enable(&rtc_instance, true);
72
73 /* Power on RTC instance */
74 nrfx_rtc_enable(&rtc_instance);
75
76 return RT_EOK;
77 }
78
rt_rtc_control(rt_device_t dev,int cmd,void * args)79 static rt_err_t rt_rtc_control(rt_device_t dev, int cmd, void *args)
80 {
81 time_t *time;
82 RT_ASSERT(dev != RT_NULL);
83
84 switch (cmd)
85 {
86 case RT_DEVICE_CTRL_RTC_GET_TIME:
87 {
88 time = (time_t *) args;
89 *time = init_time + tick;
90 break;
91 }
92 case RT_DEVICE_CTRL_RTC_SET_TIME:
93 {
94 time = (time_t *) args;
95 init_time = *time - tick;
96 break;
97 }
98 }
99 return RT_EOK;
100 }
101
102
103 #ifdef RT_USING_DEVICE_OPS
104 const static struct rt_device_ops rtc_ops =
105 {
106 RT_NULL,
107 RT_NULL,
108 RT_NULL,
109 RT_NULL,
110 RT_NULL,
111 rt_rtc_control
112 };
113 #endif
114
115
rt_hw_rtc_init(void)116 int rt_hw_rtc_init(void)
117 {
118 rt_err_t result;
119
120 result = rt_hw_rtc_register(&rtc, "rtc", RT_DEVICE_FLAG_RDWR,RT_NULL);
121
122 if (result != RT_EOK)
123 {
124 LOG_E("rtc register err code: %d", result);
125 return result;
126 }
127 LOG_D("rtc init success");
128 return RT_EOK;
129 }
130 INIT_DEVICE_EXPORT(rt_hw_rtc_init);
131
132 #endif /* BSP_USING_ONCHIP_RTC */
133
134