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Diff: targets/TARGET_NUVOTON/TARGET_NANO100/rtc_api.c
- Revision:
- 175:b96e65c34a4d
- Child:
- 177:447f873cad2f
diff -r e131a1973e81 -r b96e65c34a4d targets/TARGET_NUVOTON/TARGET_NANO100/rtc_api.c --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/targets/TARGET_NUVOTON/TARGET_NANO100/rtc_api.c Mon Oct 02 15:33:19 2017 +0100 @@ -0,0 +1,128 @@ +/* mbed Microcontroller Library + * Copyright (c) 2015-2017 Nuvoton + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#include "rtc_api.h" + +#if DEVICE_RTC + +#include "mbed_wait_api.h" +#include "mbed_error.h" +#include "nu_modutil.h" +#include "nu_miscutil.h" +#include "mbed_mktime.h" + +#define YEAR0 1900 + + +static const struct nu_modinit_s rtc_modinit = {RTC_0, RTC_MODULE, 0, 0, 0, RTC_IRQn, NULL}; + +void rtc_init(void) +{ + if (rtc_isenabled()) { + return; + } + + RTC_Open(NULL); +} + +void rtc_free(void) +{ + // N/A +} + +int rtc_isenabled(void) +{ + // NOTE: To access (RTC) registers, clock must be enabled first. + if (! (CLK->APBCLK & CLK_APBCLK_RTC_EN_Msk)) { + // Enable IP clock + CLK_EnableModuleClock(rtc_modinit.clkidx); + } + + // NOTE: Check RTC Init Active flag to support crossing reset cycle. + return !! (RTC->INIR & RTC_INIR_ACTIVE_Msk); +} + +/* + struct tm + tm_sec seconds after the minute 0-61 + tm_min minutes after the hour 0-59 + tm_hour hours since midnight 0-23 + tm_mday day of the month 1-31 + tm_mon months since January 0-11 + tm_year years since 1900 + tm_wday days since Sunday 0-6 + tm_yday days since January 1 0-365 + tm_isdst Daylight Saving Time flag +*/ + +time_t rtc_read(void) +{ + // NOTE: After boot, RTC time registers are not synced immediately, about 1 sec latency. + // RTC time got (through RTC_GetDateAndTime()) in this sec would be last-synced and incorrect. + if (! rtc_isenabled()) { + rtc_init(); + } + + S_RTC_TIME_DATA_T rtc_datetime; + RTC_GetDateAndTime(&rtc_datetime); + + struct tm timeinfo; + + // Convert struct tm to S_RTC_TIME_DATA_T + timeinfo.tm_year = rtc_datetime.u32Year - YEAR0; + timeinfo.tm_mon = rtc_datetime.u32Month - 1; + timeinfo.tm_mday = rtc_datetime.u32Day; + timeinfo.tm_wday = rtc_datetime.u32DayOfWeek; + timeinfo.tm_hour = rtc_datetime.u32Hour; + timeinfo.tm_min = rtc_datetime.u32Minute; + timeinfo.tm_sec = rtc_datetime.u32Second; + + // Convert to timestamp + time_t t = _rtc_mktime(&timeinfo); + + return t; +} + +void rtc_write(time_t t) +{ + if (! rtc_isenabled()) { + rtc_init(); + } + + // Convert timestamp to struct tm + struct tm timeinfo; + if (_rtc_localtime(t, &timeinfo) == false) { + return; + } + + S_RTC_TIME_DATA_T rtc_datetime; + + // Convert S_RTC_TIME_DATA_T to struct tm + rtc_datetime.u32Year = timeinfo.tm_year + YEAR0; + rtc_datetime.u32Month = timeinfo.tm_mon + 1; + rtc_datetime.u32Day = timeinfo.tm_mday; + rtc_datetime.u32DayOfWeek = timeinfo.tm_wday; + rtc_datetime.u32Hour = timeinfo.tm_hour; + rtc_datetime.u32Minute = timeinfo.tm_min; + rtc_datetime.u32Second = timeinfo.tm_sec; + rtc_datetime.u32TimeScale = RTC_CLOCK_24; + + RTC_SetDateAndTime(&rtc_datetime); + // Wait 3 cycles of engine clock to ensure previous CTL write action is finish + wait_us(30 * 3); +} + +#endif