/************************************************************************************ * arch/arm/src/stm32/stm32_rtcc.c * * Copyright (C) 2012-2017 Gregory Nutt. All rights reserved. * Author: Gregory Nutt * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. 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. * 3. Neither the name NuttX 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 OWNER 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. * ************************************************************************************/ /************************************************************************************ * Included Files ************************************************************************************/ #include #include #include #include #include #include #include #include #include "up_arch.h" #include "stm32_rcc.h" #include "stm32_pwr.h" #include "stm32_exti.h" #include "stm32_rtc.h" #ifdef CONFIG_RTC /************************************************************************************ * Pre-processor Definitions ************************************************************************************/ /* Configuration ********************************************************************/ /* This RTC implementation supports only date/time RTC hardware */ #ifndef CONFIG_RTC_DATETIME # error "CONFIG_RTC_DATETIME must be set to use this driver" #endif #ifdef CONFIG_RTC_HIRES # error "CONFIG_RTC_HIRES must NOT be set with this driver" #endif #ifndef CONFIG_STM32_PWR # error "CONFIG_STM32_PWR must selected to use this driver" #endif /* Constants ************************************************************************/ #define SYNCHRO_TIMEOUT (0x00020000) #define INITMODE_TIMEOUT (0x00010000) /************************************************************************************ * Private Data ************************************************************************************/ /* Callback to use when the alarm expires */ #ifdef CONFIG_RTC_ALARM static alarmcb_t g_alarmcb; #endif /************************************************************************************ * Public Data ************************************************************************************/ /* g_rtc_enabled is set true after the RTC has successfully initialized */ volatile bool g_rtc_enabled = false; /************************************************************************************ * Private Functions ************************************************************************************/ /************************************************************************************ * Name: rtc_dumpregs * * Description: * Disable RTC write protection * * Input Parameters: * None * * Returned Value: * None * ************************************************************************************/ #ifdef CONFIG_DEBUG_RTC_INFO static void rtc_dumpregs(FAR const char *msg) { rtcinfo("%s:\n", msg); rtcinfo(" TR: %08x\n", getreg32(STM32_RTC_TR)); rtcinfo(" DR: %08x\n", getreg32(STM32_RTC_DR)); rtcinfo(" CR: %08x\n", getreg32(STM32_RTC_CR)); rtcinfo(" ISR: %08x\n", getreg32(STM32_RTC_ISR)); rtcinfo(" PRER: %08x\n", getreg32(STM32_RTC_PRER)); rtcinfo(" WUTR: %08x\n", getreg32(STM32_RTC_WUTR)); #ifndef CONFIG_STM32_STM32F30XX rtcinfo(" CALIBR: %08x\n", getreg32(STM32_RTC_CALIBR)); #endif rtcinfo(" ALRMAR: %08x\n", getreg32(STM32_RTC_ALRMAR)); rtcinfo(" ALRMBR: %08x\n", getreg32(STM32_RTC_ALRMBR)); rtcinfo(" SHIFTR: %08x\n", getreg32(STM32_RTC_SHIFTR)); rtcinfo(" TSTR: %08x\n", getreg32(STM32_RTC_TSTR)); rtcinfo(" TSDR: %08x\n", getreg32(STM32_RTC_TSDR)); rtcinfo(" TSSSR: %08x\n", getreg32(STM32_RTC_TSSSR)); rtcinfo(" CALR: %08x\n", getreg32(STM32_RTC_CALR)); rtcinfo(" TAFCR: %08x\n", getreg32(STM32_RTC_TAFCR)); rtcinfo("ALRMASSR: %08x\n", getreg32(STM32_RTC_ALRMASSR)); rtcinfo("ALRMBSSR: %08x\n", getreg32(STM32_RTC_ALRMBSSR)); rtcinfo("MAGICREG: %08x\n", getreg32(RTC_MAGIC_REG)); } #else # define rtc_dumpregs(msg) #endif /************************************************************************************ * Name: rtc_dumptime * * Description: * Disable RTC write protection * * Input Parameters: * None * * Returned Value: * None * ************************************************************************************/ #ifdef CONFIG_DEBUG_RTC_INFO static void rtc_dumptime(FAR struct tm *tp, FAR const char *msg) { rtcinfo("%s:\n", msg); rtcinfo(" tm_sec: %08x\n", tp->tm_sec); rtcinfo(" tm_min: %08x\n", tp->tm_min); rtcinfo(" tm_hour: %08x\n", tp->tm_hour); rtcinfo(" tm_mday: %08x\n", tp->tm_mday); rtcinfo(" tm_mon: %08x\n", tp->tm_mon); rtcinfo(" tm_year: %08x\n", tp->tm_year); } #else # define rtc_dumptime(tp, msg) #endif /************************************************************************************ * Name: rtc_wprunlock * * Description: * Disable RTC write protection * * Input Parameters: * None * * Returned Value: * None * ************************************************************************************/ static void rtc_wprunlock(void) { /* Enable write access to the backup domain (RTC registers, RTC backup data * registers and backup SRAM). */ stm32_pwr_enablebkp(true); /* The following steps are required to unlock the write protection on all the * RTC registers (except for RTC_ISR[13:8], RTC_TAFCR, and RTC_BKPxR). * * 1. Write 0xCA into the RTC_WPR register. * 2. Write 0x53 into the RTC_WPR register. * * Writing a wrong key re-activates the write protection. */ putreg32(0xca, STM32_RTC_WPR); putreg32(0x53, STM32_RTC_WPR); } /************************************************************************************ * Name: rtc_wprlock * * Description: * Enable RTC write protection * * Input Parameters: * None * * Returned Value: * None * ************************************************************************************/ static inline void rtc_wprlock(void) { /* Writing any wrong key re-activates the write protection. */ putreg32(0xff, STM32_RTC_WPR); /* Disable write access to the backup domain (RTC registers, RTC backup data * registers and backup SRAM). */ stm32_pwr_enablebkp(false); } /************************************************************************************ * Name: rtc_synchwait * * Description: * Waits until the RTC Time and Date registers (RTC_TR and RTC_DR) are * synchronized with RTC APB clock. * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ static int rtc_synchwait(void) { volatile uint32_t timeout; uint32_t regval; int ret; /* Disable the write protection for RTC registers */ rtc_wprunlock(); /* Clear Registers synchronization flag (RSF) */ regval = getreg32(STM32_RTC_ISR); regval &= ~RTC_ISR_RSF; putreg32(regval, STM32_RTC_ISR); /* Now wait the registers to become synchronised */ ret = -ETIMEDOUT; for (timeout = 0; timeout < SYNCHRO_TIMEOUT; timeout++) { regval = getreg32(STM32_RTC_ISR); if ((regval & RTC_ISR_RSF) != 0) { /* Synchronized */ ret = OK; break; } } /* Re-enable the write protection for RTC registers */ rtc_wprlock(); return ret; } /************************************************************************************ * Name: rtc_enterinit * * Description: * Enter RTC initialization mode. * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ static int rtc_enterinit(void) { volatile uint32_t timeout; uint32_t regval; int ret; /* Check if the Initialization mode is already set */ regval = getreg32(STM32_RTC_ISR); ret = OK; if ((regval & RTC_ISR_INITF) == 0) { /* Set the Initialization mode */ putreg32(RTC_ISR_INIT, STM32_RTC_ISR); /* Wait until the RTC is in the INIT state (or a timeout occurs) */ ret = -ETIMEDOUT; for (timeout = 0; timeout < INITMODE_TIMEOUT; timeout++) { regval = getreg32(STM32_RTC_ISR); if ((regval & RTC_ISR_INITF) != 0) { ret = OK; break; } } } return ret; } /************************************************************************************ * Name: rtc_exitinit * * Description: * Exit RTC initialization mode. * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ static void rtc_exitinit(void) { uint32_t regval; regval = getreg32(STM32_RTC_ISR); regval &= ~(RTC_ISR_INIT); putreg32(regval, STM32_RTC_ISR); } /************************************************************************************ * Name: rtc_bin2bcd * * Description: * Converts a 2 digit binary to BCD format * * Input Parameters: * value - The byte to be converted. * * Returned Value: * The value in BCD representation * ************************************************************************************/ static uint32_t rtc_bin2bcd(int value) { uint32_t msbcd = 0; while (value >= 10) { msbcd++; value -= 10; } return (msbcd << 4) | value; } /************************************************************************************ * Name: rtc_bin2bcd * * Description: * Convert from 2 digit BCD to binary. * * Input Parameters: * value - The BCD value to be converted. * * Returned Value: * The value in binary representation * ************************************************************************************/ static int rtc_bcd2bin(uint32_t value) { uint32_t tens = (value >> 4) * 10; return (int)(tens + (value & 0x0f)); } /************************************************************************************ * Name: rtc_setup * * Description: * Performs first time configuration of the RTC. A special value written into * back-up register 0 will prevent this function from being called on sub-sequent * resets or power up. * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ static int rtc_setup(void) { uint32_t regval; int ret; /* Disable the write protection for RTC registers */ rtc_wprunlock(); /* Set Initialization mode */ ret = rtc_enterinit(); if (ret == OK) { /* Set the 24 hour format by clearing the FMT bit in the RTC * control register */ regval = getreg32(STM32_RTC_CR); regval &= ~RTC_CR_FMT; putreg32(regval, STM32_RTC_CR); /* Configure RTC pre-scaler with the required values */ #ifdef CONFIG_RTC_HSECLOCK /* For a 1 MHz clock this yields 0.9999360041 Hz on the second * timer - which is pretty close. */ putreg32(((uint32_t)7182 << RTC_PRER_PREDIV_S_SHIFT) | ((uint32_t)0x7f << RTC_PRER_PREDIV_A_SHIFT), STM32_RTC_PRER); #else /* Correct values for 32.768 KHz LSE clock and inaccurate LSI clock */ putreg32(((uint32_t)0xff << RTC_PRER_PREDIV_S_SHIFT) | ((uint32_t)0x7f << RTC_PRER_PREDIV_A_SHIFT), STM32_RTC_PRER); #endif /* Exit RTC initialization mode */ rtc_exitinit(); } /* Re-enable the write protection for RTC registers */ rtc_wprlock(); return ret; } /************************************************************************************ * Name: rtc_resume * * Description: * Called when the RTC was already initialized on a previous power cycle. This * just brings the RTC back into full operation. * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ static void rtc_resume(void) { #ifdef CONFIG_RTC_ALARM uint32_t regval; /* Clear the RTC alarm flags */ regval = getreg32(STM32_RTC_ISR); regval &= ~(RTC_ISR_ALRAF | RTC_ISR_ALRBF); putreg32(regval, STM32_RTC_ISR); /* Clear the EXTI Line 17 Pending bit (Connected internally to RTC Alarm) */ putreg32((1 << 17), STM32_EXTI_PR); #endif } /************************************************************************************ * Public Functions ************************************************************************************/ /************************************************************************************ * Name: up_rtc_initialize * * Description: * Initialize the hardware RTC per the selected configuration. This function is * called once during the OS initialization sequence * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ int up_rtc_initialize(void) { uint32_t regval; uint32_t tr_bkp; uint32_t dr_bkp; int ret; int maxretry = 10; int nretry = 0; /* Clocking for the PWR block must be provided. However, this is done * unconditionally in stm32f40xxx_rcc.c on power up. This done unconditionally * because the PWR block is also needed to set the internal voltage regulator for * maximum performance. */ rtc_dumpregs("On reset"); /* Select the clock source */ /* Save the token before losing it when resetting */ regval = getreg32(RTC_MAGIC_REG); stm32_pwr_enablebkp(true); if (regval != RTC_MAGIC && regval != RTC_MAGIC_TIME_SET) { /* Some boards do not have the external 32khz oscillator installed, for those * boards we must fallback to the crummy internal RC clock or the external high * rate clock */ #ifdef CONFIG_RTC_HSECLOCK /* Use the HSE clock as the input to the RTC block */ modifyreg32(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_HSE); #elif defined(CONFIG_RTC_LSICLOCK) /* Use the LSI clock as the input to the RTC block */ modifyreg32(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_LSI); #elif defined(CONFIG_RTC_LSECLOCK) /* Use the LSE clock as the input to the RTC block */ modifyreg32(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_LSE); #endif /* Enable the RTC Clock by setting the RTCEN bit in the RCC register */ modifyreg32(STM32_RCC_BDCR, 0, RCC_BDCR_RTCEN); } else /* The RTC is already in use: check if the clock source is changed */ { #if defined(CONFIG_RTC_HSECLOCK) || defined(CONFIG_RTC_LSICLOCK) || \ defined(CONFIG_RTC_LSECLOCK) uint32_t clksrc = getreg32(STM32_RCC_BDCR); #if defined(CONFIG_RTC_HSECLOCK) if ((clksrc & RCC_BDCR_RTCSEL_MASK) != RCC_BDCR_RTCSEL_HSE) #elif defined(CONFIG_RTC_LSICLOCK) if ((clksrc & RCC_BDCR_RTCSEL_MASK) != RCC_BDCR_RTCSEL_LSI) #elif defined(CONFIG_RTC_LSECLOCK) if ((clksrc & RCC_BDCR_RTCSEL_MASK) != RCC_BDCR_RTCSEL_LSE) #endif #endif { tr_bkp = getreg32(STM32_RTC_TR); dr_bkp = getreg32(STM32_RTC_DR); modifyreg32(STM32_RCC_BDCR, 0, RCC_BDCR_BDRST); modifyreg32(STM32_RCC_BDCR, RCC_BDCR_BDRST, 0); #if defined(CONFIG_RTC_HSECLOCK) /* Change to the new clock as the input to the RTC block */ modifyreg32(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_HSE); #elif defined(CONFIG_RTC_LSICLOCK) modifyreg32(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_LSI); #elif defined(CONFIG_RTC_LSECLOCK) modifyreg32(STM32_RCC_BDCR, RCC_BDCR_RTCSEL_MASK, RCC_BDCR_RTCSEL_LSE); #endif putreg32(tr_bkp, STM32_RTC_TR); putreg32(dr_bkp, STM32_RTC_DR); /* Remember that the RTC is initialized */ putreg32(RTC_MAGIC, RTC_MAGIC_REG); /* Enable the RTC Clock by setting the RTCEN bit in the RCC register */ modifyreg32(STM32_RCC_BDCR, 0, RCC_BDCR_RTCEN); } } stm32_pwr_enablebkp(false); /* Loop, attempting to initialize/resume the RTC. This loop is necessary * because it seems that occasionally it takes longer to initialize the RTC * (the actual failure is in rtc_synchwait()). */ do { /* Wait for the RTC Time and Date registers to be synchronized with RTC APB * clock. */ ret = rtc_synchwait(); /* Check that rtc_syncwait() returned successfully */ switch (ret) { case OK: { rtcinfo("rtc_syncwait() okay\n"); break; } default: { rtcerr("ERROR: rtc_syncwait() failed (%d)\n", ret); break; } } } while (ret != OK && ++nretry < maxretry); /* Check if the one-time initialization of the RTC has already been * performed. We can determine this by checking if the magic number * has been writing to to back-up date register DR0. */ if (regval != RTC_MAGIC && regval != RTC_MAGIC_TIME_SET) { rtcinfo("Do setup\n"); /* Perform the one-time setup of the LSE clocking to the RTC */ ret = rtc_setup(); /* Enable write access to the backup domain (RTC registers, RTC * backup data registers and backup SRAM). */ stm32_pwr_enablebkp(true); /* Remember that the RTC is initialized */ putreg32(RTC_MAGIC, RTC_MAGIC_REG); /* Disable write access to the backup domain (RTC registers, RTC * backup data registers and backup SRAM). */ stm32_pwr_enablebkp(false); } else { rtcinfo("Do resume\n"); /* RTC already set-up, just resume normal operation */ rtc_resume(); rtc_dumpregs("Did resume"); } if (ret != OK && nretry > 0) { rtcinfo("setup/resume ran %d times and failed with %d\n", nretry, ret); return -ETIMEDOUT; } /* Configure RTC interrupt to catch alarm interrupts. All RTC interrupts are * connected to the EXTI controller. To enable the RTC Alarm interrupt, the * following sequence is required: * * 1. Configure and enable the EXTI Line 17 in interrupt mode and select the * rising edge sensitivity. * 2. Configure and enable the RTC_Alarm IRQ channel in the NVIC. * 3. Configure the RTC to generate RTC alarms (Alarm A or Alarm B). */ g_rtc_enabled = true; rtc_dumpregs("After Initialization"); return OK; } /************************************************************************************ * Name: stm32_rtc_irqinitialize * * Description: * Initialize IRQs for RTC, not possible during up_rtc_initialize because * up_irqinitialize is called later. * * Input Parameters: * None * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ int stm32_rtc_irqinitialize(void) { #ifdef CONFIG_RTC_ALARM # warning "Missing logic" #endif return OK; } /************************************************************************************ * Name: stm32_rtc_getdatetime_with_subseconds * * Description: * Get the current date and time from the date/time RTC. This interface * is only supported by the date/time RTC hardware implementation. * It is used to replace the system timer. It is only used by the RTOS during * initialization to set up the system time when CONFIG_RTC and CONFIG_RTC_DATETIME * are selected (and CONFIG_RTC_HIRES is not). * * NOTE: Some date/time RTC hardware is capability of sub-second accuracy. That * sub-second accuracy is returned through 'nsec'. * * Input Parameters: * tp - The location to return the high resolution time value. * nsec - The location to return the subsecond time value. * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ #ifdef CONFIG_STM32_HAVE_RTC_SUBSECONDS int stm32_rtc_getdatetime_with_subseconds(FAR struct tm *tp, FAR long *nsec) #else int up_rtc_getdatetime(FAR struct tm *tp) #endif { #ifdef CONFIG_STM32_HAVE_RTC_SUBSECONDS uint32_t ssr; #endif uint32_t dr; uint32_t tr; uint32_t tmp; /* Sample the data time registers. There is a race condition here... If * we sample the time just before midnight on December 31, the date could * be wrong because the day rolled over while were sampling. Thus loop for * checking overflow here is needed. There is a race condition with * subseconds too. If we sample TR register just before second rolling * and subseconds are read at wrong second, we get wrong time. */ do { dr = getreg32(STM32_RTC_DR); tr = getreg32(STM32_RTC_TR); #ifdef CONFIG_STM32_HAVE_RTC_SUBSECONDS ssr = getreg32(STM32_RTC_SSR); tmp = getreg32(STM32_RTC_TR); if (tmp != tr) { continue; } #endif tmp = getreg32(STM32_RTC_DR); if (tmp == dr) { break; } } while (1); rtc_dumpregs("Reading Time"); /* Convert the RTC time to fields in struct tm format. All of the STM32 * ranges of values correspond between struct tm and the time register. */ tmp = (tr & (RTC_TR_SU_MASK | RTC_TR_ST_MASK)) >> RTC_TR_SU_SHIFT; tp->tm_sec = rtc_bcd2bin(tmp); tmp = (tr & (RTC_TR_MNU_MASK | RTC_TR_MNT_MASK)) >> RTC_TR_MNU_SHIFT; tp->tm_min = rtc_bcd2bin(tmp); tmp = (tr & (RTC_TR_HU_MASK | RTC_TR_HT_MASK)) >> RTC_TR_HU_SHIFT; tp->tm_hour = rtc_bcd2bin(tmp); /* Now convert the RTC date to fields in struct tm format: * Days: 1-31 match in both cases. * Month: STM32 is 1-12, struct tm is 0-11. * Years: STM32 is 00-99, struct tm is years since 1900. * WeekDay: STM32 is 1 = Mon - 7 = Sun * * Issue: I am not sure what the STM32 years mean. Are these the * years 2000-2099? I'll assume so. */ tmp = (dr & (RTC_DR_DU_MASK | RTC_DR_DT_MASK)) >> RTC_DR_DU_SHIFT; tp->tm_mday = rtc_bcd2bin(tmp); tmp = (dr & (RTC_DR_MU_MASK | RTC_DR_MT)) >> RTC_DR_MU_SHIFT; tp->tm_mon = rtc_bcd2bin(tmp) - 1; tmp = (dr & (RTC_DR_YU_MASK | RTC_DR_YT_MASK)) >> RTC_DR_YU_SHIFT; tp->tm_year = rtc_bcd2bin(tmp) + 100; #if defined(CONFIG_LIBC_LOCALTIME) || defined(CONFIG_TIME_EXTENDED) tmp = (dr & RTC_DR_WDU_MASK) >> RTC_DR_WDU_SHIFT; tp->tm_wday = tmp % 7; tp->tm_yday = tp->tm_mday + clock_daysbeforemonth(tp->tm_mon, clock_isleapyear(tp->tm_year + 1900)); tp->tm_isdst = 0; #endif #ifdef CONFIG_STM32_HAVE_RTC_SUBSECONDS /* Return RTC sub-seconds if no configured and if a non-NULL value * of nsec has been provided to receive the sub-second value. */ if (nsec) { uint32_t prediv_s; uint32_t usecs; prediv_s = getreg32(STM32_RTC_PRER) & RTC_PRER_PREDIV_S_MASK; prediv_s >>= RTC_PRER_PREDIV_S_SHIFT; ssr &= RTC_SSR_MASK; /* Maximum prediv_s is 0x7fff, thus we can multiply by 100000 and * still fit 32-bit unsigned integer. */ usecs = (((prediv_s - ssr) * 100000) / (prediv_s + 1)) * 10; *nsec = usecs * 1000; } #endif /* CONFIG_STM32_HAVE_RTC_SUBSECONDS */ rtc_dumptime(tp, "Returning"); return OK; } /************************************************************************************ * Name: up_rtc_getdatetime * * Description: * Get the current date and time from the date/time RTC. This interface * is only supported by the date/time RTC hardware implementation. * It is used to replace the system timer. It is only used by the RTOS during * initialization to set up the system time when CONFIG_RTC and CONFIG_RTC_DATETIME * are selected (and CONFIG_RTC_HIRES is not). * * NOTE: Some date/time RTC hardware is capability of sub-second accuracy. That * sub-second accuracy is lost in this interface. However, since the system time * is reinitialized on each power-up/reset, there will be no timing inaccuracy in * the long run. * * Input Parameters: * tp - The location to return the high resolution time value. * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ #ifdef CONFIG_STM32_HAVE_RTC_SUBSECONDS int up_rtc_getdatetime(FAR struct tm *tp) { return stm32_rtc_getdatetime_with_subseconds(tp, NULL); } #endif /************************************************************************************ * Name: up_rtc_getdatetime_with_subseconds * * Description: * Get the current date and time from the date/time RTC. This interface * is only supported by the date/time RTC hardware implementation. * It is used to replace the system timer. It is only used by the RTOS during * initialization to set up the system time when CONFIG_RTC and CONFIG_RTC_DATETIME * are selected (and CONFIG_RTC_HIRES is not). * * NOTE: This interface exposes sub-second accuracy capability of RTC hardware. * This interface allow maintaining timing accuracy when system time needs constant * resynchronization with RTC, for example on MCU with low-power state that * stop system timer. * * Input Parameters: * tp - The location to return the high resolution time value. * nsec - The location to return the subsecond time value. * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ #ifdef CONFIG_ARCH_HAVE_RTC_SUBSECONDS # ifndef CONFIG_STM32_HAVE_RTC_SUBSECONDS # error "Invalid config, enable CONFIG_STM32_HAVE_RTC_SUBSECONDS." # endif int up_rtc_getdatetime_with_subseconds(FAR struct tm *tp, FAR long *nsec) { return stm32_rtc_getdatetime_with_subseconds(tp, nsec); } #endif /************************************************************************************ * Name: stm32_rtc_setdatetime * * Description: * Set the RTC to the provided time. RTC implementations which provide * up_rtc_getdatetime() (CONFIG_RTC_DATETIME is selected) should provide this * function. * * Input Parameters: * tp - the time to use * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ int stm32_rtc_setdatetime(FAR const struct tm *tp) { uint32_t tr; uint32_t dr; int ret; rtc_dumptime(tp, "Setting time"); /* Then write the broken out values to the RTC */ /* Convert the struct tm format to RTC time register fields. All of the STM32 * All of the ranges of values correspond between struct tm and the time * register. */ tr = (rtc_bin2bcd(tp->tm_sec) << RTC_TR_SU_SHIFT) | (rtc_bin2bcd(tp->tm_min) << RTC_TR_MNU_SHIFT) | (rtc_bin2bcd(tp->tm_hour) << RTC_TR_HU_SHIFT); tr &= ~RTC_TR_RESERVED_BITS; /* Now convert the fields in struct tm format to the RTC date register fields: * Days: 1-31 match in both cases. * Month: STM32 is 1-12, struct tm is 0-11. * Years: STM32 is 00-99, struct tm is years since 1900. * WeekDay: STM32 is 1 = Mon - 7 = Sun * Issue: I am not sure what the STM32 years mean. Are these the * years 2000-2099? I'll assume so. */ dr = (rtc_bin2bcd(tp->tm_mday) << RTC_DR_DU_SHIFT) | ((rtc_bin2bcd(tp->tm_mon + 1)) << RTC_DR_MU_SHIFT) | #if defined(CONFIG_LIBC_LOCALTIME) || defined(CONFIG_TIME_EXTENDED) ((tp->tm_wday == 0 ? 7 : (tp->tm_wday & 7)) << RTC_DR_WDU_SHIFT) | #endif ((rtc_bin2bcd(tp->tm_year - 100)) << RTC_DR_YU_SHIFT); dr &= ~RTC_DR_RESERVED_BITS; /* Disable the write protection for RTC registers */ rtc_wprunlock(); /* Set Initialization mode */ ret = rtc_enterinit(); if (ret == OK) { /* Set the RTC TR and DR registers */ putreg32(tr, STM32_RTC_TR); putreg32(dr, STM32_RTC_DR); /* Exit Initialization mode and wait for the RTC Time and Date * registers to be synchronized with RTC APB clock. */ rtc_exitinit(); ret = rtc_synchwait(); } /* Remember that the RTC is initialized and had its time set. */ if (getreg32(RTC_MAGIC_REG) != RTC_MAGIC_TIME_SET) { stm32_pwr_enablebkp(true); putreg32(RTC_MAGIC_TIME_SET, RTC_MAGIC_REG); stm32_pwr_enablebkp(false); } /* Re-enable the write protection for RTC registers */ rtc_wprlock(); rtc_dumpregs("New time setting"); return ret; } /************************************************************************************ * Name: up_rtc_settime * * Description: * Set the RTC to the provided time. All RTC implementations must be able to * set their time based on a standard timespec. * * Input Parameters: * tp - the time to use * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ int up_rtc_settime(FAR const struct timespec *tp) { FAR struct tm newtime; /* Break out the time values (not that the time is set only to units of seconds) */ (void)gmtime_r(&tp->tv_sec, &newtime); return stm32_rtc_setdatetime(&newtime); } /************************************************************************************ * Name: stm32_rtc_setalarm * * Description: * Set up an alarm. Up to two alarms can be supported (ALARM A and ALARM B). * * Input Parameters: * tp - the time to set the alarm * callback - the function to call when the alarm expires. * * Returned Value: * Zero (OK) on success; a negated errno on failure * ************************************************************************************/ #ifdef CONFIG_RTC_ALARM int stm32_rtc_setalarm(FAR const struct timespec *tp, alarmcb_t callback) { int ret = -EBUSY; /* Is there already something waiting on the ALARM? */ if (g_alarmcb == NULL) { /* No.. Save the callback function pointer */ g_alarmcb = callback; /* Break out the time values */ #warning "Missing logic" /* The set the alarm */ #warning "Missing logic" ret = OK; } return ret; } #endif #endif /* CONFIG_RTC */