diff options
Diffstat (limited to 'drivers/src/fsl_rtc.c')
| -rw-r--r-- | drivers/src/fsl_rtc.c | 381 |
1 files changed, 381 insertions, 0 deletions
diff --git a/drivers/src/fsl_rtc.c b/drivers/src/fsl_rtc.c new file mode 100644 index 0000000..d68055a --- /dev/null +++ b/drivers/src/fsl_rtc.c @@ -0,0 +1,381 @@ +/* + * Copyright (c) 2015, Freescale Semiconductor, Inc. + * Copyright 2016-2017 NXP + * + * Redistribution and use in source and binary forms, with or without modification, + * are permitted provided that the following conditions are met: + * + * o Redistributions of source code must retain the above copyright notice, this list + * of conditions and the following disclaimer. + * + * o Redistributions in binary form must reproduce the above copyright notice, this + * list of conditions and the following disclaimer in the documentation and/or + * other materials provided with the distribution. + * + * o Neither the name of the copyright holder nor the names of its + * contributors may be used to endorse or promote products derived from this + * software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED + * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR + * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES + * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON + * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include "fsl_rtc.h" + +/******************************************************************************* + * Definitions + ******************************************************************************/ +#define SECONDS_IN_A_DAY (86400U) +#define SECONDS_IN_A_HOUR (3600U) +#define SECONDS_IN_A_MINUTE (60U) +#define DAYS_IN_A_YEAR (365U) +#define YEAR_RANGE_START (1970U) +#define YEAR_RANGE_END (2099U) + +/******************************************************************************* + * Prototypes + ******************************************************************************/ +/*! + * @brief Checks whether the date and time passed in is valid + * + * @param datetime Pointer to structure where the date and time details are stored + * + * @return Returns false if the date & time details are out of range; true if in range + */ +static bool RTC_CheckDatetimeFormat(const rtc_datetime_t *datetime); + +/*! + * @brief Converts time data from datetime to seconds + * + * @param datetime Pointer to datetime structure where the date and time details are stored + * + * @return The result of the conversion in seconds + */ +static uint32_t RTC_ConvertDatetimeToSeconds(const rtc_datetime_t *datetime); + +/*! + * @brief Converts time data from seconds to a datetime structure + * + * @param seconds Seconds value that needs to be converted to datetime format + * @param datetime Pointer to the datetime structure where the result of the conversion is stored + */ +static void RTC_ConvertSecondsToDatetime(uint32_t seconds, rtc_datetime_t *datetime); + +/******************************************************************************* + * Code + ******************************************************************************/ +static bool RTC_CheckDatetimeFormat(const rtc_datetime_t *datetime) +{ + assert(datetime); + + /* Table of days in a month for a non leap year. First entry in the table is not used, + * valid months start from 1 + */ + uint8_t daysPerMonth[] = {0U, 31U, 28U, 31U, 30U, 31U, 30U, 31U, 31U, 30U, 31U, 30U, 31U}; + + /* Check year, month, hour, minute, seconds */ + if ((datetime->year < YEAR_RANGE_START) || (datetime->year > YEAR_RANGE_END) || (datetime->month > 12U) || + (datetime->month < 1U) || (datetime->hour >= 24U) || (datetime->minute >= 60U) || (datetime->second >= 60U)) + { + /* If not correct then error*/ + return false; + } + + /* Adjust the days in February for a leap year */ + if ((((datetime->year & 3U) == 0) && (datetime->year % 100 != 0)) || (datetime->year % 400 == 0)) + { + daysPerMonth[2] = 29U; + } + + /* Check the validity of the day */ + if ((datetime->day > daysPerMonth[datetime->month]) || (datetime->day < 1U)) + { + return false; + } + + return true; +} + +static uint32_t RTC_ConvertDatetimeToSeconds(const rtc_datetime_t *datetime) +{ + assert(datetime); + + /* Number of days from begin of the non Leap-year*/ + /* Number of days from begin of the non Leap-year*/ + uint16_t monthDays[] = {0U, 0U, 31U, 59U, 90U, 120U, 151U, 181U, 212U, 243U, 273U, 304U, 334U}; + uint32_t seconds; + + /* Compute number of days from 1970 till given year*/ + seconds = (datetime->year - 1970U) * DAYS_IN_A_YEAR; + /* Add leap year days */ + seconds += ((datetime->year / 4) - (1970U / 4)); + /* Add number of days till given month*/ + seconds += monthDays[datetime->month]; + /* Add days in given month. We subtract the current day as it is + * represented in the hours, minutes and seconds field*/ + seconds += (datetime->day - 1); + /* For leap year if month less than or equal to Febraury, decrement day counter*/ + if ((!(datetime->year & 3U)) && (datetime->month <= 2U)) + { + seconds--; + } + + seconds = (seconds * SECONDS_IN_A_DAY) + (datetime->hour * SECONDS_IN_A_HOUR) + + (datetime->minute * SECONDS_IN_A_MINUTE) + datetime->second; + + return seconds; +} + +static void RTC_ConvertSecondsToDatetime(uint32_t seconds, rtc_datetime_t *datetime) +{ + assert(datetime); + + uint32_t x; + uint32_t secondsRemaining, days; + uint16_t daysInYear; + /* Table of days in a month for a non leap year. First entry in the table is not used, + * valid months start from 1 + */ + uint8_t daysPerMonth[] = {0U, 31U, 28U, 31U, 30U, 31U, 30U, 31U, 31U, 30U, 31U, 30U, 31U}; + + /* Start with the seconds value that is passed in to be converted to date time format */ + secondsRemaining = seconds; + + /* Calcuate the number of days, we add 1 for the current day which is represented in the + * hours and seconds field + */ + days = secondsRemaining / SECONDS_IN_A_DAY + 1; + + /* Update seconds left*/ + secondsRemaining = secondsRemaining % SECONDS_IN_A_DAY; + + /* Calculate the datetime hour, minute and second fields */ + datetime->hour = secondsRemaining / SECONDS_IN_A_HOUR; + secondsRemaining = secondsRemaining % SECONDS_IN_A_HOUR; + datetime->minute = secondsRemaining / 60U; + datetime->second = secondsRemaining % SECONDS_IN_A_MINUTE; + + /* Calculate year */ + daysInYear = DAYS_IN_A_YEAR; + datetime->year = YEAR_RANGE_START; + while (days > daysInYear) + { + /* Decrease day count by a year and increment year by 1 */ + days -= daysInYear; + datetime->year++; + + /* Adjust the number of days for a leap year */ + if (datetime->year & 3U) + { + daysInYear = DAYS_IN_A_YEAR; + } + else + { + daysInYear = DAYS_IN_A_YEAR + 1; + } + } + + /* Adjust the days in February for a leap year */ + if (!(datetime->year & 3U)) + { + daysPerMonth[2] = 29U; + } + + for (x = 1U; x <= 12U; x++) + { + if (days <= daysPerMonth[x]) + { + datetime->month = x; + break; + } + else + { + days -= daysPerMonth[x]; + } + } + + datetime->day = days; +} + +void RTC_Init(RTC_Type *base, const rtc_config_t *config) +{ + assert(config); + + uint32_t reg; + +#if !(defined(FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) && FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL) + CLOCK_EnableClock(kCLOCK_Rtc0); +#endif /* FSL_SDK_DISABLE_DRIVER_CLOCK_CONTROL */ + + /* Issue a software reset if timer is invalid */ + if (RTC_GetStatusFlags(RTC) & kRTC_TimeInvalidFlag) + { + RTC_Reset(RTC); + } + + reg = base->CR; + /* Setup the update mode and supervisor access mode */ + reg &= ~(RTC_CR_UM_MASK | RTC_CR_SUP_MASK); + reg |= RTC_CR_UM(config->updateMode) | RTC_CR_SUP(config->supervisorAccess); +#if defined(FSL_FEATURE_RTC_HAS_WAKEUP_PIN_SELECTION) && FSL_FEATURE_RTC_HAS_WAKEUP_PIN_SELECTION + /* Setup the wakeup pin select */ + reg &= ~(RTC_CR_WPS_MASK); + reg |= RTC_CR_WPS(config->wakeupSelect); +#endif /* FSL_FEATURE_RTC_HAS_WAKEUP_PIN */ + base->CR = reg; + + /* Configure the RTC time compensation register */ + base->TCR = (RTC_TCR_CIR(config->compensationInterval) | RTC_TCR_TCR(config->compensationTime)); +} + +void RTC_GetDefaultConfig(rtc_config_t *config) +{ + assert(config); + + /* Wakeup pin will assert if the RTC interrupt asserts or if the wakeup pin is turned on */ + config->wakeupSelect = false; + /* Registers cannot be written when locked */ + config->updateMode = false; + /* Non-supervisor mode write accesses are not supported and will generate a bus error */ + config->supervisorAccess = false; + /* Compensation interval used by the crystal compensation logic */ + config->compensationInterval = 0; + /* Compensation time used by the crystal compensation logic */ + config->compensationTime = 0; +} + +status_t RTC_SetDatetime(RTC_Type *base, const rtc_datetime_t *datetime) +{ + assert(datetime); + + /* Return error if the time provided is not valid */ + if (!(RTC_CheckDatetimeFormat(datetime))) + { + return kStatus_InvalidArgument; + } + + /* Set time in seconds */ + base->TSR = RTC_ConvertDatetimeToSeconds(datetime); + + return kStatus_Success; +} + +void RTC_GetDatetime(RTC_Type *base, rtc_datetime_t *datetime) +{ + assert(datetime); + + uint32_t seconds = 0; + + seconds = base->TSR; + RTC_ConvertSecondsToDatetime(seconds, datetime); +} + +status_t RTC_SetAlarm(RTC_Type *base, const rtc_datetime_t *alarmTime) +{ + assert(alarmTime); + + uint32_t alarmSeconds = 0; + uint32_t currSeconds = 0; + + /* Return error if the alarm time provided is not valid */ + if (!(RTC_CheckDatetimeFormat(alarmTime))) + { + return kStatus_InvalidArgument; + } + + alarmSeconds = RTC_ConvertDatetimeToSeconds(alarmTime); + + /* Get the current time */ + currSeconds = base->TSR; + + /* Return error if the alarm time has passed */ + if (alarmSeconds < currSeconds) + { + return kStatus_Fail; + } + + /* Set alarm in seconds*/ + base->TAR = alarmSeconds; + + return kStatus_Success; +} + +void RTC_GetAlarm(RTC_Type *base, rtc_datetime_t *datetime) +{ + assert(datetime); + + uint32_t alarmSeconds = 0; + + /* Get alarm in seconds */ + alarmSeconds = base->TAR; + + RTC_ConvertSecondsToDatetime(alarmSeconds, datetime); +} + +void RTC_ClearStatusFlags(RTC_Type *base, uint32_t mask) +{ + /* The alarm flag is cleared by writing to the TAR register */ + if (mask & kRTC_AlarmFlag) + { + base->TAR = 0U; + } + + /* The timer overflow flag is cleared by initializing the TSR register. + * The time counter should be disabled for this write to be successful + */ + if (mask & kRTC_TimeOverflowFlag) + { + base->TSR = 1U; + } + + /* The timer overflow flag is cleared by initializing the TSR register. + * The time counter should be disabled for this write to be successful + */ + if (mask & kRTC_TimeInvalidFlag) + { + base->TSR = 1U; + } +} + +#if defined(FSL_FEATURE_RTC_HAS_MONOTONIC) && (FSL_FEATURE_RTC_HAS_MONOTONIC) + +void RTC_GetMonotonicCounter(RTC_Type *base, uint64_t *counter) +{ + assert(counter); + + *counter = (((uint64_t)base->MCHR << 32) | ((uint64_t)base->MCLR)); +} + +void RTC_SetMonotonicCounter(RTC_Type *base, uint64_t counter) +{ + /* Prepare to initialize the register with the new value written */ + base->MER &= ~RTC_MER_MCE_MASK; + + base->MCHR = (uint32_t)((counter) >> 32); + base->MCLR = (uint32_t)(counter); +} + +status_t RTC_IncrementMonotonicCounter(RTC_Type *base) +{ + if (base->SR & (RTC_SR_MOF_MASK | RTC_SR_TIF_MASK)) + { + return kStatus_Fail; + } + + /* Prepare to switch to increment mode */ + base->MER |= RTC_MER_MCE_MASK; + /* Write anything so the counter increments*/ + base->MCLR = 1U; + + return kStatus_Success; +} + +#endif /* FSL_FEATURE_RTC_HAS_MONOTONIC */ |