/****************************************************************************** * Copyright (C) 2023 Maxim Integrated Products, Inc., All Rights Reserved. * * Permission is hereby granted, free of charge, to any person obtaining a * copy of this software and associated documentation files (the "Software"), * to deal in the Software without restriction, including without limitation * the rights to use, copy, modify, merge, publish, distribute, sublicense, * and/or sell copies of the Software, and to permit persons to whom the * Software is furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES * OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR * OTHER DEALINGS IN THE SOFTWARE. * * Except as contained in this notice, the name of Maxim Integrated * Products, Inc. shall not be used except as stated in the Maxim Integrated * Products, Inc. Branding Policy. * * The mere transfer of this software does not imply any licenses * of trade secrets, proprietary technology, copyrights, patents, * trademarks, maskwork rights, or any other form of intellectual * property whatsoever. Maxim Integrated Products, Inc. retains all * ownership rights. * ******************************************************************************/ #include <stdbool.h> #include <stddef.h> #include "gpio_regs.h" #include "mxc_delay.h" #include "mxc_device.h" #include "mxc_errors.h" #include "mxc_sys.h" #include "rtc.h" #include "rtc_reva.h" #include "tmr.h" #if TARGET_NUM == 32650 #include "pwrseq_regs.h" #endif void MXC_RTC_Wait_BusyToClear(void) { while (MXC_RTC_REVA_IS_BUSY) {} } int MXC_RTC_RevA_GetBusyFlag(mxc_rtc_reva_regs_t *rtc) { if (MXC_RTC_REVA_IS_BUSY) { return E_BUSY; } return E_SUCCESS; } int MXC_RTC_RevA_EnableInt(mxc_rtc_reva_regs_t *rtc, uint32_t mask) { mask &= (MXC_RTC_INT_EN_LONG | MXC_RTC_INT_EN_SHORT | MXC_RTC_INT_EN_READY); if (!mask) { /* No bits set? Wasn't something we can enable. */ return E_BAD_PARAM; } MXC_RTC_Wait_BusyToClear(); rtc->ctrl |= mask; /* If TOD and SSEC interrupt enable, check busy after CTRL register write*/ mask &= ~MXC_RTC_INT_EN_READY; if (mask) { MXC_RTC_Wait_BusyToClear(); } return E_SUCCESS; } int MXC_RTC_RevA_DisableInt(mxc_rtc_reva_regs_t *rtc, uint32_t mask) { mask &= (MXC_RTC_INT_EN_LONG | MXC_RTC_INT_EN_SHORT | MXC_RTC_INT_EN_READY); if (!mask) { /* No bits set? Wasn't something we can enable. */ return E_BAD_PARAM; } MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~mask; /* If TOD and SSEC interrupt enable, check busy after CTRL register write*/ mask &= ~MXC_RTC_INT_EN_READY; if (mask) { MXC_RTC_Wait_BusyToClear(); } return E_SUCCESS; } int MXC_RTC_RevA_SetTimeofdayAlarm(mxc_rtc_reva_regs_t *rtc, uint32_t ras) { // ras can only be written if BUSY = 0 & (RTCE = 0 or ADE = 0); if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->toda = (ras << MXC_F_RTC_REVA_TODA_TOD_ALARM_POS) & MXC_F_RTC_REVA_TODA_TOD_ALARM; return E_SUCCESS; } int MXC_RTC_RevA_SetSubsecondAlarm(mxc_rtc_reva_regs_t *rtc, uint32_t rssa) { // ras can only be written if BUSY = 0 & (RTCE = 0 or ASE = 0); if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->sseca = (rssa << MXC_F_RTC_REVA_SSECA_SSEC_ALARM_POS) & MXC_F_RTC_REVA_SSECA_SSEC_ALARM; return E_SUCCESS; } int MXC_RTC_RevA_Start(mxc_rtc_reva_regs_t *rtc) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->ctrl |= MXC_F_RTC_REVA_CTRL_WR_EN; // Allow writing to registers MXC_RTC_Wait_BusyToClear(); // Can only write if WE=1 and BUSY=0 rtc->ctrl |= MXC_F_RTC_REVA_CTRL_EN; // setting RTCE = 1 MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_WR_EN; // Prevent Writing... return E_SUCCESS; } int MXC_RTC_RevA_Stop(mxc_rtc_reva_regs_t *rtc) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->ctrl |= MXC_F_RTC_REVA_CTRL_WR_EN; // Allow writing to registers MXC_RTC_Wait_BusyToClear(); // Can only write if WE=1 and BUSY=0 rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_EN; // setting RTCE = 0 MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_WR_EN; // Prevent Writing... return E_SUCCESS; } int MXC_RTC_RevA_Init(mxc_rtc_reva_regs_t *rtc, uint32_t sec, uint32_t ssec) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->ctrl = MXC_F_RTC_REVA_CTRL_WR_EN; // Allow Writes MXC_RTC_Wait_BusyToClear(); rtc->ctrl = MXC_RTC_REVA_CTRL_RESET_DEFAULT; // Start with a Clean Register MXC_RTC_Wait_BusyToClear(); rtc->ctrl |= MXC_F_RTC_REVA_CTRL_WR_EN; // Set Write Enable, allow writing to reg. MXC_RTC_Wait_BusyToClear(); rtc->ssec = ssec; MXC_RTC_Wait_BusyToClear(); rtc->sec = sec; MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_WR_EN; // Prevent Writing... return E_SUCCESS; } int MXC_RTC_RevA_SquareWave(mxc_rtc_reva_regs_t *rtc, mxc_rtc_reva_sqwave_en_t sqe, mxc_rtc_freq_sel_t ft) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->ctrl |= MXC_F_RTC_REVA_CTRL_WR_EN; // Allow writing to registers MXC_RTC_Wait_BusyToClear(); if (sqe == MXC_RTC_REVA_SQUARE_WAVE_ENABLED) { if (ft == MXC_RTC_F_32KHZ) { // if 32KHz output is selected... rtc->oscctrl |= MXC_F_RTC_REVA_OSCCTRL_SQW_32K; // Enable 32KHz wave MXC_RTC_Wait_BusyToClear(); rtc->ctrl |= MXC_F_RTC_REVA_CTRL_SQW_EN; // Enable output on the pin } else { // if 1Hz, 512Hz, 4KHz output is selected rtc->oscctrl &= ~MXC_F_RTC_REVA_OSCCTRL_SQW_32K; // Must make sure that the 32KHz is disabled MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_SQW_SEL; MXC_RTC_Wait_BusyToClear(); rtc->ctrl |= (MXC_F_RTC_REVA_CTRL_SQW_EN | ft); // Enable Sq. wave, } MXC_RTC_Wait_BusyToClear(); rtc->ctrl |= MXC_F_RTC_REVA_CTRL_EN; // Enable Real Time Clock } else { // Turn off the square wave output on the pin rtc->oscctrl &= ~MXC_F_RTC_REVA_OSCCTRL_SQW_32K; // Must make sure that the 32KHz is disabled MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_SQW_EN; // No sq. wave output } MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_WR_EN; // Disable Writing to register return E_SUCCESS; } int MXC_RTC_RevA_Trim(mxc_rtc_reva_regs_t *rtc, int8_t trim) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } rtc->ctrl |= MXC_F_RTC_REVA_CTRL_WR_EN; MXC_RTC_Wait_BusyToClear(); MXC_SETFIELD(rtc->trim, MXC_F_RTC_REVA_TRIM_TRIM, trim << MXC_F_RTC_REVA_TRIM_TRIM_POS); MXC_RTC_Wait_BusyToClear(); rtc->ctrl &= ~MXC_F_RTC_REVA_CTRL_WR_EN; // Disable Writing to register return E_SUCCESS; } int MXC_RTC_RevA_GetFlags(mxc_rtc_reva_regs_t *rtc) { return rtc->ctrl & (MXC_RTC_INT_FL_LONG | MXC_RTC_INT_FL_SHORT | MXC_RTC_INT_FL_READY); } int MXC_RTC_RevA_ClearFlags(mxc_rtc_reva_regs_t *rtc, int flags) { rtc->ctrl &= ~(flags & (MXC_RTC_INT_FL_LONG | MXC_RTC_INT_FL_SHORT | MXC_RTC_INT_FL_READY)); return E_SUCCESS; } int MXC_RTC_RevA_GetSubSecond(mxc_rtc_reva_regs_t *rtc) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } #if TARGET_NUM == 32650 int ssec; if (ChipRevision > 0xA1) { ssec = ((MXC_PWRSEQ->ctrl >> 12) & 0xF00) | (rtc->ssec & 0xFF); } else { ssec = rtc->ssec; } return ssec; #else return rtc->ssec; #endif } int MXC_RTC_RevA_GetSecond(mxc_rtc_reva_regs_t *rtc) { if (MXC_RTC_RevA_GetBusyFlag(rtc)) { return E_BUSY; } return rtc->sec; } int MXC_RTC_RevA_GetTime(mxc_rtc_reva_regs_t *rtc, uint32_t *sec, uint32_t *subsec) { uint32_t temp_sec = 0; if (sec == NULL || subsec == NULL) { return E_NULL_PTR; } do { // Check if an update is about to happen. if (!(rtc->ctrl & MXC_F_RTC_REVA_CTRL_RDY)) { return E_BUSY; } // Read the seconds count. temp_sec = MXC_RTC_RevA_GetSecond(rtc); if (temp_sec == E_BUSY) { return E_BUSY; } // Check if an update is about to happen. if (!(rtc->ctrl & MXC_F_RTC_REVA_CTRL_RDY)) { return E_BUSY; } // Read the sub-seconds count. *subsec = MXC_RTC_RevA_GetSubSecond(rtc); // Check if an update is about to happen. if (!(rtc->ctrl & MXC_F_RTC_REVA_CTRL_RDY)) { return E_BUSY; } // Read the seconds count. *sec = MXC_RTC_RevA_GetSecond(rtc); // Repeat until a steady state is reached. } while (temp_sec != *sec); return E_NO_ERROR; } int MXC_RTC_RevA_TrimCrystal(mxc_rtc_reva_regs_t *rtc, mxc_tmr_regs_t *tmr) { int err, ppm = 0; uint32_t sec = 0, ssec = 0, ctrl = 0; uint32_t sec_sample[MXC_RTC_REVA_TRIM_PERIODS + 1] = { 0 }; uint32_t ssec_sample[MXC_RTC_REVA_TRIM_PERIODS + 1] = { 0 }; bool rtc_en = true; if (!(rtc->ctrl & MXC_F_RTC_REVA_CTRL_EN)) { // If RTC not enable, initialize it rtc_en = false; while ((sec = MXC_RTC_RevA_GetSecond(rtc)) < 0) {} // Save state while ((ssec = MXC_RTC_RevA_GetSubSecond(rtc)) < 0) {} while (rtc->ctrl & MXC_F_RTC_CTRL_BUSY) {} ctrl = rtc->ctrl; if ((err = MXC_RTC_Init(0, 0)) != E_NO_ERROR) { return err; } MXC_RTC_Start(); } MXC_TMR_ClearFlags(tmr); MXC_TMR_Start(tmr); // Sample the RTC ticks in MXC_RTC_REVA_TRIM_PERIODS number of periods while ((sec_sample[0] = MXC_RTC_RevA_GetSecond(rtc)) < 0) {} while ((ssec_sample[0] = MXC_RTC_RevA_GetSubSecond(rtc)) < 0) {} for (int i = 1; i < (MXC_RTC_REVA_TRIM_PERIODS + 1); i++) { while (!(MXC_TMR_GetFlags(tmr) & MXC_RTC_TRIM_TMR_IRQ)) {} // Wait for time trim period to elapse while ((sec_sample[i] = MXC_RTC_RevA_GetSecond(rtc)) < 0) {} // Take time sample while ((ssec_sample[i] = MXC_RTC_RevA_GetSubSecond(rtc)) < 0) {} MXC_TMR_ClearFlags(tmr); } MXC_TMR_Stop(tmr); // Shutdown timer MXC_TMR_Shutdown(tmr); if (!rtc_en) { // If RTC wasn't enabled entering the function, restore state MXC_RTC_Stop(); while (rtc->ctrl & MXC_F_RTC_REVA_CTRL_BUSY) {} MXC_SETFIELD(rtc->ssec, MXC_F_RTC_REVA_SSEC_SSEC, (ssec << MXC_F_RTC_REVA_SSEC_SSEC_POS)); while (rtc->ctrl & MXC_F_RTC_REVA_CTRL_BUSY) {} MXC_SETFIELD(rtc->sec, MXC_F_RTC_REVA_SEC_SEC, (sec << MXC_F_RTC_REVA_SEC_SEC_POS)); while (rtc->ctrl & MXC_F_RTC_REVA_CTRL_BUSY) {} rtc->ctrl = ctrl; } for (int i = 0; i < MXC_RTC_REVA_TRIM_PERIODS; i++) { // Get total error in RTC ticks over MXC_RTC_REVA_TRIM_PERIODS number of sample periods if (sec_sample[i] < sec_sample[i + 1]) { ppm += MXC_RTC_REVA_TICKS_PER_PERIOD - ((MXC_RTC_MAX_SSEC - ssec_sample[i]) + ssec_sample[i + 1]); } else { ppm += MXC_RTC_REVA_TICKS_PER_PERIOD - (ssec_sample[i + 1] - ssec_sample[i]); } } ppm /= MXC_RTC_REVA_TRIM_PERIODS; ppm = PPM(ppm); // Convert total error to PPM and set trim if (ppm < -128 || ppm > 127) { return E_OVERFLOW; } return MXC_RTC_RevA_Trim(rtc, (int8_t)ppm); // Set Trim }