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ChibiOS/os/hal/platforms/LPC17xx/rtc_lld.c

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/*
ChibiOS/RT - Copyright (C) 2006-2013 Giovanni Di Sirio
LPC17xx RTC driver - Copyright (C) 2013 Marcin Jokel
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.
*/
/*
Concepts and parts of this file have been contributed by Uladzimir Pylinsky
aka barthess.
*/
/**
* @file LPC17xx/rtc_lld.c
* @brief LPC17xx RTC low level driver.
*
* @addtogroup RTC
* @{
*/
#include "ch.h"
#include "hal.h"
#if HAL_USE_RTC || defined(__DOXYGEN__)
/*===========================================================================*/
/* Driver local definitions. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver exported variables. */
/*===========================================================================*/
/**
* @brief RTC driver identifier.
*/
RTCDriver RTCD1;
/*===========================================================================*/
/* Driver local variables and types. */
/*===========================================================================*/
/*===========================================================================*/
/* Driver local functions. */
/*===========================================================================*/
/**
* @brief Enable RTC clock.
*/
#define _rtc_clk_enable() \
LPC_RTC->CCR |= CCR_CLKEN
/**
* @brief Disable RTC clock.
*/
#define _rtc_clk_disable() \
LPC_RTC->CCR &= ~CCR_CLKEN
/*===========================================================================*/
/* Driver interrupt handlers. */
/*===========================================================================*/
/**
* @brief RTC interrupt handler.
*
* @isr
*/
#if LPC17xx_RTC_USE_ALARM || defined(__DOXYGEN__)
CH_IRQ_HANDLER(Vector84) {
uint32_t status;
CH_IRQ_PROLOGUE();
status = LPC_RTC->ILR;
LPC_RTC->ILR = status; /* Clear interrupt flag */
if ((status & ILR_RTCALF) && (RTCD1.callback != NULL))
RTCD1.callback(&RTCD1, RTC_EVENT_ALARM);
CH_IRQ_EPILOGUE();
}
#endif
/*===========================================================================*/
/* Driver exported functions. */
/*===========================================================================*/
/**
* @brief Enable access to registers.
*
* @api
*/
void rtc_lld_init(void) {
if(LPC_RTC->RTC_AUX & RTC_AUX_RTC_OSCF) { /* Set after RTC power was first turn. */
LPC_RTC->CCR = CCR_CCALEN; /* Disable calibration and RTC clock. */
LPC_RTC->CALIBRATION = 0;
LPC_RTC->RTC_AUX = RTC_AUX_RTC_OSCF; /* Clear RTC Oscillator Fail detect flag. */
LPC_RTC->CIIR = 0; /* Disable Counter Increment Interrupt. */
LPC_RTC->AMR = AMR_MASK_ALL; /* Mask alarm interrupt. */
LPC_RTC->ILR = ILR_RTCALF | ILR_RTCCIF; /* Clear interrupt flags. */
/* Set date to Saturday 01.01.2000 00:00:00 */
LPC_RTC->SEC = 0;
LPC_RTC->MIN = 0;
LPC_RTC->HOUR = 0;
LPC_RTC->DOM = 1;
LPC_RTC->MONTH = 1;
LPC_RTC->YEAR = 2000;
LPC_RTC->DOW = 6;
LPC_RTC->DOY = 1;
_rtc_clk_enable(); /* Enable RTC clock. */
}
#if LPC17xx_RTC_USE_ALARM
nvicEnableVector(RTC_IRQn, CORTEX_PRIORITY_MASK(LPC17xx_RTC_IRQ_PRIORITY));
#endif
return;
}
/**
* @brief Set current time.
* @note Fractional part will be silently ignored. There is no possibility
* to set it on STM32 platform.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] timespec pointer to a @p RTCTime structure
*
* @api
*/
void rtc_lld_set_time(RTCDriver *rtcp, const RTCTime *timespec) {
(void)rtcp;
_rtc_clk_disable(); /* Disable RTC clock. */
LPC_RTC->SEC = timespec->sec;
LPC_RTC->MIN = timespec->min;
LPC_RTC->HOUR = timespec->hour;
LPC_RTC->DOM = timespec->dom;
LPC_RTC->MONTH = timespec->month;
LPC_RTC->YEAR = timespec->year;
LPC_RTC->DOW = timespec->dow;
LPC_RTC->DOY = timespec->doy;
_rtc_clk_enable(); /* Enable RTC clock. */
}
/**
* @brief Get current time.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[out] timespec pointer to a @p RTCTime structure
*
* @api
*/
void rtc_lld_get_time(RTCDriver *rtcp, RTCTime *timespec) {
(void)rtcp;
timespec->sec = LPC_RTC->SEC;
timespec->min = LPC_RTC->MIN;
timespec->hour = LPC_RTC->HOUR;
timespec->dom = LPC_RTC->DOM;
timespec->month = LPC_RTC->MONTH;
timespec->year = LPC_RTC->YEAR;
timespec->dow = LPC_RTC->DOW;
timespec->doy = LPC_RTC->DOY;
}
/**
* @brief Set alarm time.
*
* @note Default value after BKP domain reset for both comparators is 0.
* @note Function does not performs any checks of alarm time validity.
*
* @param[in] rtcp Pointer to RTC driver structure.
* @param[in] alarm Alarm identifier. Can be 1 or 2.
* @param[in] alarmspec Pointer to a @p RTCAlarm structure.
*
* @api
*/
void rtc_lld_set_alarm(RTCDriver *rtcp,
rtcalarm_t alarm,
const RTCAlarm *alarmspec) {
(void)rtcp;
(void)alarm;
LPC_RTC->ALSEC = alarmspec->alsec;
LPC_RTC->ALMIN = alarmspec->almin;
LPC_RTC->ALHOUR = alarmspec->alhour;
LPC_RTC->ALDOM = alarmspec->aldom;
LPC_RTC->ALMON = alarmspec->almonth;
LPC_RTC->ALYEAR = alarmspec->alyear;
LPC_RTC->ALDOW = alarmspec->aldow;
LPC_RTC->ALDOY = alarmspec->aldoy;
}
/**
* @brief Get alarm time.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] alarm alarm identifier
* @param[out] alarmspec pointer to a @p RTCAlarm structure
*
* @api
*/
void rtc_lld_get_alarm(RTCDriver *rtcp,
rtcalarm_t alarm,
RTCAlarm *alarmspec) {
(void)rtcp;
(void)alarm;
alarmspec->alsec = LPC_RTC->ALSEC;
alarmspec->almin = LPC_RTC->ALMIN;
alarmspec->alhour = LPC_RTC->ALHOUR;
alarmspec->aldom = LPC_RTC->ALDOM;
alarmspec->almonth = LPC_RTC->ALMON;
alarmspec->alyear = LPC_RTC->ALYEAR;
alarmspec->aldow = LPC_RTC->ALDOW;
alarmspec->aldoy = LPC_RTC->ALDOY;
}
/**
* @brief Enables or disables RTC callbacks.
* @details This function enables or disables callbacks, use a @p NULL pointer
* in order to disable a callback.
*
* @param[in] rtcp pointer to RTC driver structure
* @param[in] callback callback function pointer or @p NULL
*
* @notapi
*/
void rtc_lld_set_callback(RTCDriver *rtcp, rtccb_t callback) {
LPC_RTC->AMR = AMR_MASK_ALL; /* Mask alarm interrupt. */
LPC_RTC->ILR = ILR_RTCALF; /* Clear interrupt flag. */
if (callback != NULL) {
/* IRQ sources enabled only after setting up the callback.*/
rtcp->callback = callback;
LPC_RTC->AMR = 0; /* Enable alarm interrupt. */
}
else {
/* Callback set to NULL only after disabling the IRQ sources.*/
rtcp->callback = NULL;
}
}
#include "chrtclib.h"
/**
* @brief Get current time in format suitable for usage in FatFS.
*
* @param[in] rtcp pointer to RTC driver structure
* @return FAT time value.
*
* @api
*/
uint32_t rtc_lld_get_time_fat(RTCDriver *rtcp) {
uint32_t fattime;
struct tm timp;
rtcGetTimeTm(rtcp, &timp);
fattime = (timp.tm_sec) >> 1;
fattime |= (timp.tm_min) << 5;
fattime |= (timp.tm_hour) << 11;
fattime |= (timp.tm_mday) << 16;
fattime |= (timp.tm_mon + 1) << 21;
fattime |= (timp.tm_year - 80) << 25;
return fattime;
}
#endif /* HAL_USE_RTC */
/** @} */
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