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-rw-r--r--os/hal/platforms/LPC17xx/rtc_lld.c290
1 files changed, 290 insertions, 0 deletions
diff --git a/os/hal/platforms/LPC17xx/rtc_lld.c b/os/hal/platforms/LPC17xx/rtc_lld.c
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+++ b/os/hal/platforms/LPC17xx/rtc_lld.c
@@ -0,0 +1,290 @@
+/*
+ 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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