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Adding f4-specific rtc functions

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These should also work with the f2
This commit is contained in:
Michael Aherne 2013-02-26 18:23:31 -08:00
parent 8c8b6440e7
commit a121769785
2 changed files with 68 additions and 1 deletions
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11
include/libopencm3/stm32/f4/rtc.h
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@ -36,4 +36,13 @@ LGPL License Terms @ref lgpl_license
#include <libopencm3/stm32/memorymap.h> #include <libopencm3/stm32/memorymap.h>
#include <libopencm3/stm32/common/rtc_common_bcd.h> #include <libopencm3/stm32/common/rtc_common_bcd.h>
#endif BEGIN_DECLS
void rtc_enable_wakeup_timer(void);
void rtc_disable_wakeup_timer(void);
void rtc_enable_wakeup_timer_interrupt(void);
void rtc_disable_wakeup_timer_interrupt(void);
END_DECLS
#endif

58
lib/stm32/f4/rtc.c
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@ -25,3 +25,61 @@
#include <libopencm3/stm32/rtc.h> #include <libopencm3/stm32/rtc.h>
#include <libopencm3/stm32/common/rtc_common_bcd.h> #include <libopencm3/stm32/common/rtc_common_bcd.h>
/*---------------------------------------------------------------------------*/
/** @brief Enable the wakeup timer
@warning You must unlock the registers before using this function
*/
void rtc_enable_wakeup_timer(void) {
RTC_CR |= RTC_CR_WUTE | (RTC_CR_OSEL_WAKEUP << RTC_CR_OSEL_SHIFT);
rtc_enable_wakeup_timer_interrupt();
}
/*---------------------------------------------------------------------------*/
/** @brief Disable the wakeup timer
@warning You must unlock the registers before using this function
*/
void rtc_disable_wakeup_timer(void) {
RTC_CR &= ~RTC_CR_WUTE;
rtc_disable_wakeup_timer_interrupt();
}
/*---------------------------------------------------------------------------*/
/** @brief Enable the wakeup timer interrupt
@warning You must unlock the registers before using this function
*/
void rtc_enable_wakeup_timer_interrupt(void) {
// FTFM:
// To enable the RTC Wakeup interrupt, the following sequence is required:
// 1. Configure and enable the EXTI Line 22 in interrupt mode and select the
// rising edge sensitivity.
exti_enable_request(EXTI22);
exti_set_trigger(EXTI22, EXTI_TRIGGER_RISING);
// 2. Configure and enable the RTC_WKUP IRQ channel in the NVIC.
nvic_enable_irq(NVIC_RTC_WKUP_IRQ);
nvic_set_priority(NVIC_RTC_WKUP_IRQ, 1);
// 3. Configure the RTC to generate the RTC wakeup timer event.
RTC_CR |= RTC_CR_WUTIE; // Enable the interrupt
}
/*---------------------------------------------------------------------------*/
/** @brief Disable the wakeup timer interrupt
@warning You must unlock the registers before using this function
*/
void rtc_disable_wakeup_timer_interrupt(void) {
// 1. Disable EXTI Line 22
exti_disable_request(EXTI22);
// 2. Disable RTC_WKUP IRQ channel in the NVIC.
nvic_disable_irq(NVIC_RTC_WKUP_IRQ);
// 3. Disable RTC wakeup timer event.
RTC_CR &= ~RTC_CR_WUTIE;
}