Tux Leon / mbed-dev

mbed library sources. Supersedes mbed-src.

Fork of mbed-dev by mbed official

targets/TARGET_NUVOTON/TARGET_M451/rtc_api.c@181:96ed750bd169, 2018-01-17 (annotated)

Committer:
Anna Bridge
Date:
Wed Jan 17 15:23:54 2018 +0000
Revision:
181:96ed750bd169
Parent:
176:447f873cad2f 
mbed-dev libray. Release version 158

Who changed what in which revision?

UserRevisionLine numberNew contents of line
<> 144:ef7eb2e8f9f7 1 /* mbed Microcontroller Library
<> 144:ef7eb2e8f9f7 2 * Copyright (c) 2015-2016 Nuvoton
<> 144:ef7eb2e8f9f7 3 *
<> 144:ef7eb2e8f9f7 4 * Licensed under the Apache License, Version 2.0 (the "License");
<> 144:ef7eb2e8f9f7 5 * you may not use this file except in compliance with the License.
<> 144:ef7eb2e8f9f7 6 * You may obtain a copy of the License at
<> 144:ef7eb2e8f9f7 7 *
<> 144:ef7eb2e8f9f7 8 * http://www.apache.org/licenses/LICENSE-2.0
<> 144:ef7eb2e8f9f7 9 *
<> 144:ef7eb2e8f9f7 10 * Unless required by applicable law or agreed to in writing, software
<> 144:ef7eb2e8f9f7 11 * distributed under the License is distributed on an "AS IS" BASIS,
<> 144:ef7eb2e8f9f7 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
<> 144:ef7eb2e8f9f7 13 * See the License for the specific language governing permissions and
<> 144:ef7eb2e8f9f7 14 * limitations under the License.
<> 144:ef7eb2e8f9f7 15 */
<> 144:ef7eb2e8f9f7 16
<> 144:ef7eb2e8f9f7 17 #include "rtc_api.h"
<> 144:ef7eb2e8f9f7 18
<> 144:ef7eb2e8f9f7 19 #if DEVICE_RTC
<> 144:ef7eb2e8f9f7 20
<> 160:d5399cc887bb 21 #include "mbed_wait_api.h"
<> 144:ef7eb2e8f9f7 22 #include "mbed_error.h"
<> 144:ef7eb2e8f9f7 23 #include "nu_modutil.h"
<> 144:ef7eb2e8f9f7 24 #include "nu_miscutil.h"
AnnaBridge 167:e84263d55307 25 #include "mbed_mktime.h"
<> 144:ef7eb2e8f9f7 26
<> 144:ef7eb2e8f9f7 27 #define YEAR0 1900
<> 144:ef7eb2e8f9f7 28 //#define EPOCH_YR 1970
<> 144:ef7eb2e8f9f7 29
<> 144:ef7eb2e8f9f7 30 static const struct nu_modinit_s rtc_modinit = {RTC_0, RTC_MODULE, 0, 0, 0, RTC_IRQn, NULL};
<> 144:ef7eb2e8f9f7 31
<> 144:ef7eb2e8f9f7 32 void rtc_init(void)
<> 144:ef7eb2e8f9f7 33 {
AnnaBridge 172:7d866c31b3c5 34 if (rtc_isenabled()) {
<> 144:ef7eb2e8f9f7 35 return;
<> 144:ef7eb2e8f9f7 36 }
<> 144:ef7eb2e8f9f7 37
<> 144:ef7eb2e8f9f7 38 RTC_Open(NULL);
<> 144:ef7eb2e8f9f7 39 }
<> 144:ef7eb2e8f9f7 40
<> 144:ef7eb2e8f9f7 41 void rtc_free(void)
<> 144:ef7eb2e8f9f7 42 {
AnnaBridge 172:7d866c31b3c5 43 // N/A
<> 144:ef7eb2e8f9f7 44 }
<> 144:ef7eb2e8f9f7 45
<> 144:ef7eb2e8f9f7 46 int rtc_isenabled(void)
<> 144:ef7eb2e8f9f7 47 {
AnnaBridge 172:7d866c31b3c5 48 // NOTE: To access (RTC) registers, clock must be enabled first.
AnnaBridge 172:7d866c31b3c5 49 if (! (CLK->APBCLK0 & CLK_APBCLK0_RTCCKEN_Msk)) {
AnnaBridge 172:7d866c31b3c5 50 // Enable IP clock
AnnaBridge 172:7d866c31b3c5 51 CLK_EnableModuleClock(rtc_modinit.clkidx);
AnnaBridge 172:7d866c31b3c5 52 }
AnnaBridge 172:7d866c31b3c5 53
AnnaBridge 172:7d866c31b3c5 54 // NOTE: Check RTC Init Active flag to support crossing reset cycle.
AnnaBridge 172:7d866c31b3c5 55 return !! (RTC->INIT & RTC_INIT_ACTIVE_Msk);
<> 144:ef7eb2e8f9f7 56 }
<> 144:ef7eb2e8f9f7 57
<> 144:ef7eb2e8f9f7 58 /*
<> 144:ef7eb2e8f9f7 59 struct tm
<> 144:ef7eb2e8f9f7 60 tm_sec seconds after the minute 0-61
<> 144:ef7eb2e8f9f7 61 tm_min minutes after the hour 0-59
<> 144:ef7eb2e8f9f7 62 tm_hour hours since midnight 0-23
<> 144:ef7eb2e8f9f7 63 tm_mday day of the month 1-31
<> 144:ef7eb2e8f9f7 64 tm_mon months since January 0-11
<> 144:ef7eb2e8f9f7 65 tm_year years since 1900
<> 144:ef7eb2e8f9f7 66 tm_wday days since Sunday 0-6
<> 144:ef7eb2e8f9f7 67 tm_yday days since January 1 0-365
<> 144:ef7eb2e8f9f7 68 tm_isdst Daylight Saving Time flag
<> 144:ef7eb2e8f9f7 69 */
<> 144:ef7eb2e8f9f7 70
<> 144:ef7eb2e8f9f7 71 time_t rtc_read(void)
<> 144:ef7eb2e8f9f7 72 {
AnnaBridge 172:7d866c31b3c5 73 // NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency.
AnnaBridge 172:7d866c31b3c5 74 // RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect.
AnnaBridge 172:7d866c31b3c5 75 if (! rtc_isenabled()) {
<> 144:ef7eb2e8f9f7 76 rtc_init();
<> 144:ef7eb2e8f9f7 77 }
<> 144:ef7eb2e8f9f7 78
<> 144:ef7eb2e8f9f7 79 S_RTC_TIME_DATA_T rtc_datetime;
<> 144:ef7eb2e8f9f7 80 RTC_GetDateAndTime(&rtc_datetime);
<> 144:ef7eb2e8f9f7 81
<> 144:ef7eb2e8f9f7 82 struct tm timeinfo;
<> 144:ef7eb2e8f9f7 83
<> 144:ef7eb2e8f9f7 84 // Convert struct tm to S_RTC_TIME_DATA_T
<> 144:ef7eb2e8f9f7 85 timeinfo.tm_year = rtc_datetime.u32Year - YEAR0;
<> 144:ef7eb2e8f9f7 86 timeinfo.tm_mon = rtc_datetime.u32Month - 1;
<> 144:ef7eb2e8f9f7 87 timeinfo.tm_mday = rtc_datetime.u32Day;
<> 144:ef7eb2e8f9f7 88 timeinfo.tm_wday = rtc_datetime.u32DayOfWeek;
<> 144:ef7eb2e8f9f7 89 timeinfo.tm_hour = rtc_datetime.u32Hour;
AnnaBridge 176:447f873cad2f 90 if (rtc_datetime.u32TimeScale == RTC_CLOCK_12 && rtc_datetime.u32AmPm == RTC_PM) {
AnnaBridge 176:447f873cad2f 91 timeinfo.tm_hour += 12;
AnnaBridge 176:447f873cad2f 92 }
<> 144:ef7eb2e8f9f7 93 timeinfo.tm_min = rtc_datetime.u32Minute;
<> 144:ef7eb2e8f9f7 94 timeinfo.tm_sec = rtc_datetime.u32Second;
<> 144:ef7eb2e8f9f7 95
<> 144:ef7eb2e8f9f7 96 // Convert to timestamp
AnnaBridge 167:e84263d55307 97 time_t t = _rtc_mktime(&timeinfo);
<> 144:ef7eb2e8f9f7 98
<> 144:ef7eb2e8f9f7 99 return t;
<> 144:ef7eb2e8f9f7 100 }
<> 144:ef7eb2e8f9f7 101
<> 144:ef7eb2e8f9f7 102 void rtc_write(time_t t)
<> 144:ef7eb2e8f9f7 103 {
AnnaBridge 172:7d866c31b3c5 104 if (! rtc_isenabled()) {
<> 144:ef7eb2e8f9f7 105 rtc_init();
<> 144:ef7eb2e8f9f7 106 }
<> 144:ef7eb2e8f9f7 107
<> 144:ef7eb2e8f9f7 108 // Convert timestamp to struct tm
AnnaBridge 167:e84263d55307 109 struct tm timeinfo;
AnnaBridge 167:e84263d55307 110 if (_rtc_localtime(t, &timeinfo) == false) {
AnnaBridge 167:e84263d55307 111 return;
AnnaBridge 167:e84263d55307 112 }
<> 144:ef7eb2e8f9f7 113
<> 144:ef7eb2e8f9f7 114 S_RTC_TIME_DATA_T rtc_datetime;
<> 144:ef7eb2e8f9f7 115
<> 144:ef7eb2e8f9f7 116 // Convert S_RTC_TIME_DATA_T to struct tm
AnnaBridge 167:e84263d55307 117 rtc_datetime.u32Year = timeinfo.tm_year + YEAR0;
AnnaBridge 167:e84263d55307 118 rtc_datetime.u32Month = timeinfo.tm_mon + 1;
AnnaBridge 167:e84263d55307 119 rtc_datetime.u32Day = timeinfo.tm_mday;
AnnaBridge 167:e84263d55307 120 rtc_datetime.u32DayOfWeek = timeinfo.tm_wday;
AnnaBridge 167:e84263d55307 121 rtc_datetime.u32Hour = timeinfo.tm_hour;
AnnaBridge 167:e84263d55307 122 rtc_datetime.u32Minute = timeinfo.tm_min;
AnnaBridge 167:e84263d55307 123 rtc_datetime.u32Second = timeinfo.tm_sec;
<> 144:ef7eb2e8f9f7 124 rtc_datetime.u32TimeScale = RTC_CLOCK_24;
<> 144:ef7eb2e8f9f7 125
<> 144:ef7eb2e8f9f7 126 // NOTE: Timing issue with write to RTC registers. This delay is empirical, not rational.
<> 144:ef7eb2e8f9f7 127 RTC_SetDateAndTime(&rtc_datetime);
<> 144:ef7eb2e8f9f7 128 //nu_nop(6000);
<> 144:ef7eb2e8f9f7 129 wait_us(100);
<> 144:ef7eb2e8f9f7 130 }
<> 144:ef7eb2e8f9f7 131
<> 144:ef7eb2e8f9f7 132 #endif