From dd756332457b900a88999f7ae7158513233061f6 Mon Sep 17 00:00:00 2001 From: Michael Aherne Date: Tue, 26 Feb 2013 21:22:19 -0800 Subject: Adding some useful functions for wakeup timer interrupts --- lib/stm32/common/rtc_common_bcd.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+) (limited to 'lib/stm32') diff --git a/lib/stm32/common/rtc_common_bcd.c b/lib/stm32/common/rtc_common_bcd.c index c302ea2..cddfe9b 100644 --- a/lib/stm32/common/rtc_common_bcd.c +++ b/lib/stm32/common/rtc_common_bcd.c @@ -75,4 +75,35 @@ void rtc_lock(void) { RTC_WPR = 0xff; } +/*---------------------------------------------------------------------------*/ +/** @brief Sets the wakeup time auto-reload value + +*/ +void rtc_set_wakeup_time(u16 wkup_time, u8 rtc_cr_wucksel) { +// FTFM: +// The following sequence is required to configure or change the wakeup timer +// auto-reload value (WUT[15:0] in RTC_WUTR): +// 1. Clear WUTE in RTC_CR to disable the wakeup timer. + RTC_CR &= ~RTC_CR_WUTE; +// 2. Poll WUTWF until it is set in RTC_ISR to make sure the access to wakeup +// auto-reload counter and to WUCKSEL[2:0] bits is allowed. It takes around 2 +// RTCCLK clock cycles (due to clock synchronization). + while (!((RTC_ISR) & (RTC_ISR_WUTWF))) { } +// 3. Program the wakeup auto-reload value WUT[15:0], and the wakeup clock +// selection (WUCKSEL[2:0] bits in RTC_CR).Set WUTE in RTC_CR to enable the +// timer again. The wakeup timer restarts down-counting. + RTC_WUTR = wkup_time; + RTC_CR |= (rtc_cr_wucksel << RTC_CR_WUCLKSEL_SHIFT); + RTC_CR |= RTC_CR_WUTE; +} + +/*---------------------------------------------------------------------------*/ +/** @brief Clears the wakeup flag + + @details This function should be called first in the rtc_wkup_isr() +*/ +void rtc_clear_wakeup_flag(void) { + RTC_ISR &= ~RTC_ISR_WUTF; +} + /**@}*/ -- cgit v1.2.3