Arti Zirk
244fdbc35c
subrepo: subdir: "libopencm3" merged: "f5813a54" upstream: origin: "https://github.com/libopencm3/libopencm3" branch: "master" commit: "f5813a54" git-subrepo: version: "0.4.3" origin: "???" commit: "???"
339 lines
10 KiB
C
339 lines
10 KiB
C
/** @addtogroup rtc_file RTC peripheral API
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@ingroup peripheral_apis
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@author @htmlonly © @endhtmlonly 2012 Karl Palsson <karlp@tweak.net.au>
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*/
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/*
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* This file is part of the libopencm3 project.
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*
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* Copyright (C) 2012 Karl Palsson <karlp@tweak.net.au>
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*
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* This library is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this library. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**@{*/
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#include <libopencm3/stm32/rtc.h>
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static uint8_t _rtc_dec_to_bcd(uint8_t dec)
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{
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return ((dec / 10) << 4) | (dec % 10);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Set RTC prescalars.
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This sets the RTC synchronous and asynchronous prescalars.
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*/
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void rtc_set_prescaler(uint32_t sync, uint32_t async)
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{
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/*
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* Even if only one of the two fields needs to be changed,
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* 2 separate write accesses must be performed to the RTC_PRER register.
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*/
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RTC_PRER = (sync & RTC_PRER_PREDIV_S_MASK);
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RTC_PRER |= (async << RTC_PRER_PREDIV_A_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Wait for RTC registers to be synchronised with the APB1 bus
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Time and Date are accessed through shadow registers which must be synchronized
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*/
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void rtc_wait_for_synchro(void)
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{
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/* Unlock RTC registers */
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RTC_WPR = 0xca;
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RTC_WPR = 0x53;
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RTC_ISR &= ~(RTC_ISR_RSF);
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while (!(RTC_ISR & RTC_ISR_RSF));
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/* disable write protection again */
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RTC_WPR = 0xff;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Unlock write access to the RTC registers
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*/
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void rtc_unlock(void)
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{
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RTC_WPR = 0xca;
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RTC_WPR = 0x53;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Lock write access to the RTC registers
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*/
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void rtc_lock(void)
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{
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RTC_WPR = 0xff;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the wakeup time auto-reload value
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*/
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void rtc_set_wakeup_time(uint16_t wkup_time, uint8_t rtc_cr_wucksel)
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{
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/* FTFM:
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* The following sequence is required to configure or change the wakeup
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* timer auto-reload value (WUT[15:0] in RTC_WUTR):
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* 1. Clear WUTE in RTC_CR to disable the wakeup timer.
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*/
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RTC_CR &= ~RTC_CR_WUTE;
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/* 2. Poll WUTWF until it is set in RTC_ISR to make sure the access to
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* wakeup auto-reload counter and to WUCKSEL[2:0] bits is allowed.
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* It takes around 2 RTCCLK clock cycles (due to clock
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* synchronization).
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*/
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while (!((RTC_ISR) & (RTC_ISR_WUTWF)));
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/* 3. Program the wakeup auto-reload value WUT[15:0], and the wakeup
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* clock selection (WUCKSEL[2:0] bits in RTC_CR).Set WUTE in RTC_CR
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* to enable the timer again. The wakeup timer restarts
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* down-counting.
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*/
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RTC_WUTR = wkup_time;
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RTC_CR &= ~(RTC_CR_WUCLKSEL_MASK << RTC_CR_WUCLKSEL_SHIFT);
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RTC_CR |= (rtc_cr_wucksel << RTC_CR_WUCLKSEL_SHIFT);
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RTC_CR |= RTC_CR_WUTE;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Clears the wakeup flag
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@details This function should be called first in the rtc_wkup_isr()
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*/
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void rtc_clear_wakeup_flag(void)
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{
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RTC_ISR &= ~RTC_ISR_WUTF;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the initialization flag
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_set_init_flag(void)
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{
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RTC_ISR |= RTC_ISR_INIT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Clears (resets) the initialization flag
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_clear_init_flag(void)
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{
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RTC_ISR &= ~RTC_ISR_INIT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Returns if the RTC_ISR init flag RTC_ISR_INITF is set
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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bool rtc_init_flag_is_ready(void)
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{
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return (RTC_ISR & RTC_ISR_INITF);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Waits infinitely for initialization flag to be set in RTC_ISR
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_wait_for_init_ready(void)
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{
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while (!rtc_init_flag_is_ready());
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the bypass shadow bit in RTC_CR
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_enable_bypass_shadow_register(void)
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{
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RTC_CR |= RTC_CR_BYPSHAD;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Clears the bypass shadow bit in RTC_CR
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_disable_bypass_shadow_register(void)
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{
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RTC_CR &= ~RTC_CR_BYPSHAD;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC control register hour format to AM (24h)
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_set_am_format(void)
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{
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RTC_CR &= ~RTC_CR_FMT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC control register hour format to PM (12h)
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@details Requires unlocking backup domain write protection (PWR_CR_DBP)
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*/
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void rtc_set_pm_format(void)
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{
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RTC_CR |= RTC_CR_FMT;
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD calendar year value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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The year value should only be the abbreviated year tens, meaning if 2021 is
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desired pass in only 21.
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*/
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void rtc_calendar_set_year(uint8_t year)
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{
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uint8_t bcd_year = _rtc_dec_to_bcd(year);
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RTC_DR &= ~(RTC_DR_YT_MASK << RTC_DR_YT_SHIFT | RTC_DR_YU_MASK << RTC_DR_YU_SHIFT);
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RTC_DR |= (((bcd_year >> 4) & RTC_DR_YT_MASK) << RTC_DR_YT_SHIFT) |
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((bcd_year & RTC_DR_YU_MASK) << RTC_DR_YU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD calendar weekday
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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*/
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void rtc_calendar_set_weekday(enum rtc_weekday rtc_dr_wdu)
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{
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RTC_DR &= ~(RTC_DR_WDU_MASK << RTC_DR_WDU_SHIFT);
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RTC_DR |= (rtc_dr_wdu << RTC_DR_WDU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD calendar month value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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*/
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void rtc_calendar_set_month(uint8_t month)
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{
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uint8_t bcd_month = _rtc_dec_to_bcd(month);
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RTC_DR &= ~(RTC_DR_MT_MASK << RTC_DR_MT_SHIFT | RTC_DR_MU_MASK << RTC_DR_MU_SHIFT);
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RTC_DR |= (((bcd_month >> 4) & RTC_DR_MT_MASK) << RTC_DR_MT_SHIFT) |
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((bcd_month & RTC_DR_MU_MASK) << RTC_DR_MU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD calendar day value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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*/
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void rtc_calendar_set_day(uint8_t day)
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{
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uint8_t bcd_day = _rtc_dec_to_bcd(day);
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RTC_DR &= ~(RTC_DR_DT_MASK << RTC_DR_DT_SHIFT | RTC_DR_DU_MASK << RTC_DR_DU_SHIFT);
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RTC_DR |= (((bcd_day >> 4) & RTC_DR_DT_MASK) << RTC_DR_DT_SHIFT) |
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((bcd_day & RTC_DR_DU_MASK) << RTC_DR_DU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD calendar value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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The year value should only be the abbreviated year tens, meaning if 2021 is
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desired pass in only 21.
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*/
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void rtc_calendar_set_date(uint8_t year, uint8_t month, uint8_t day, enum rtc_weekday rtc_dr_wdu)
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{
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rtc_calendar_set_year(year);
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rtc_calendar_set_month(month);
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rtc_calendar_set_weekday(rtc_dr_wdu);
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rtc_calendar_set_day(day);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD time hour value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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Pass true to use_am_notation to use 24-hour input time; pass false to
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use_am_notation to use 12-hour (AM/PM) input time
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*/
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void rtc_time_set_hour(uint8_t hour, bool use_am_notation)
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{
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if (use_am_notation) {
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RTC_TR &= ~(RTC_TR_PM);
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} else {
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RTC_TR |= RTC_TR_PM;
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}
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uint8_t bcd_hour = _rtc_dec_to_bcd(hour);
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RTC_TR &= ~(RTC_TR_HT_MASK << RTC_TR_HT_SHIFT | RTC_TR_HU_MASK << RTC_TR_HU_SHIFT);
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RTC_TR |= (((bcd_hour >> 4) & RTC_TR_HT_MASK) << RTC_TR_HT_SHIFT) |
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((bcd_hour & RTC_TR_HU_MASK) << RTC_TR_HU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD time minute value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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*/
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void rtc_time_set_minute(uint8_t minute)
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{
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uint8_t bcd_minute = _rtc_dec_to_bcd(minute);
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RTC_TR &= ~(RTC_TR_MNT_MASK << RTC_TR_MNT_SHIFT | RTC_TR_MNU_MASK << RTC_TR_MNU_SHIFT);
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RTC_TR |= (((bcd_minute >> 4) & RTC_TR_MNT_MASK) << RTC_TR_MNT_SHIFT) |
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((bcd_minute & RTC_TR_MNU_MASK) << RTC_TR_MNU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD time second value
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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*/
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void rtc_time_set_second(uint8_t second)
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{
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uint8_t bcd_second = _rtc_dec_to_bcd(second);
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RTC_TR &= ~(RTC_TR_ST_MASK << RTC_TR_ST_SHIFT | RTC_TR_SU_MASK << RTC_TR_SU_SHIFT);
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RTC_TR |= (((bcd_second >> 4) & RTC_TR_ST_MASK) << RTC_TR_ST_SHIFT) |
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((bcd_second & RTC_TR_SU_MASK) << RTC_TR_SU_SHIFT);
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}
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/*---------------------------------------------------------------------------*/
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/** @brief Sets the RTC BCD time
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@details Requires unlocking the RTC write-protection (RTC_WPR)
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*/
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void rtc_time_set_time(uint8_t hour, uint8_t minute, uint8_t second, bool use_am_notation)
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{
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rtc_time_set_hour(hour, use_am_notation);
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rtc_time_set_minute(minute);
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rtc_time_set_second(second);
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}
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/**@}*/
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