420 lines
11 KiB
C
420 lines
11 KiB
C
/* ****************************************************************************
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* Copyright (C) 2017 Maxim Integrated Products, Inc., All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the "Software"),
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* to deal in the Software without restriction, including without limitation
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* the rights to use, copy, modify, merge, publish, distribute, sublicense,
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* and/or sell copies of the Software, and to permit persons to whom the
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* Software is furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included
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* in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
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* IN NO EVENT SHALL MAXIM INTEGRATED BE LIABLE FOR ANY CLAIM, DAMAGES
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* OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
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* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
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* OTHER DEALINGS IN THE SOFTWARE.
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*
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* Except as contained in this notice, the name of Maxim Integrated
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* Products, Inc. shall not be used except as stated in the Maxim Integrated
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* Products, Inc. Branding Policy.
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*
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* The mere transfer of this software does not imply any licenses
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* of trade secrets, proprietary technology, copyrights, patents,
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* trademarks, maskwork rights, or any other form of intellectual
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* property whatsoever. Maxim Integrated Products, Inc. retains all
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* ownership rights.
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*
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*
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**************************************************************************** */
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#include "mxc_config.h"
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#include "rtc_regs.h"
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#include "rtc.h"
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#include "mxc_sys.h"
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#include "mxc_delay.h"
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#include "gpio_regs.h"
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#include "mxc_errors.h"
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#if TARGET == 32650
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#include "pwrseq_regs.h"
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#endif
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#define RTC_CTRL_RESET_DEFAULT (0x0000UL)
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#define RTC_IS_BUSY (MXC_RTC->ctrl & MXC_F_RTC_CTRL_BUSY)
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#define RTC_IS_ENABLED (MXC_RTC->ctrl & MXC_F_RTC_CTRL_RTCE)
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#define BUSY_TIMEOUT 1000 // Timeout counts for the Busy bit
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// *****************************************************************************
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int RTC_EnableTimeofdayInterrupt(mxc_rtc_regs_t *rtc)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_ADE; // Enable Time-of-day Interrupt
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_DisableTimeofdayInterrupt(mxc_rtc_regs_t *rtc)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_ADE; // Disable Time-of-day Interrupt
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_EnableSubsecondInterrupt(mxc_rtc_regs_t *rtc)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_ASE; // Enable Sub-Second Interrupt
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_DisableSubsecondInterrupt(mxc_rtc_regs_t *rtc)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_ASE; // Alarm Sub-Second Interrupt disabled
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_SetTimeofdayAlarm(mxc_rtc_regs_t *rtc, uint32_t ras)
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{
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// ras can only be written if BUSY = 0 & (RTCE = 0 or ADE = 0);
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if(RTC_DisableTimeofdayInterrupt(rtc) == E_BUSY) {
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return E_BUSY;
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}
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ras = (ras << MXC_F_RTC_RAS_RAS_POS) & MXC_F_RTC_RAS_RAS;
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if(RTC_EnableTimeofdayInterrupt(rtc) == E_BUSY) {
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return E_BUSY;
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}
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_SetSubsecondAlarm(mxc_rtc_regs_t *rtc, uint32_t rssa)
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{
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// ras can only be written if BUSY = 0 & (RTCE = 0 or ASE = 0);
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if(RTC_DisableSubsecondInterrupt(rtc) == E_BUSY) {
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return E_BUSY;
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}
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->rssa = (rssa << MXC_F_RTC_RSSA_RSSA_POS) & MXC_F_RTC_RSSA_RSSA;
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if(RTC_EnableSubsecondInterrupt(rtc) == E_BUSY) {
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return E_BUSY;
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}
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_EnableRTCE(mxc_rtc_regs_t *rtc)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_WE; // Allow writing to registers
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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// Can only write if WE=1 and BUSY=0
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rtc->ctrl |= MXC_F_RTC_CTRL_RTCE; // setting RTCE = 1
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_WE; // Prevent Writing...
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_DisableRTCE(mxc_rtc_regs_t *rtc)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_WE; // Allow writing to registers
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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// Can only write if WE=1 and BUSY=0
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rtc->ctrl &= ~MXC_F_RTC_CTRL_RTCE; // setting RTCE = 0
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_WE; // Prevent Writing...
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_Init(mxc_rtc_regs_t *rtc, uint32_t sec, uint8_t ssec, sys_cfg_rtc_t *sys_cfg)
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{
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#if((TARGET == 32650) || (TARGET == 32660))
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SYS_ClockEnable_X32K(sys_cfg);
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#else
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SYS_RTCClockEnable(sys_cfg);
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#endif
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl = MXC_F_RTC_CTRL_WE; // Allow Writes
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl = RTC_CTRL_RESET_DEFAULT; // Start with a Clean Register
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_WE; // Set Write Enable, allow writing to reg.
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ssec = ssec;
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->sec = sec;
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_WE; // Prevent Writing...
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_SquareWave(mxc_rtc_regs_t *rtc, rtc_sqwave_en_t sqe, rtc_freq_sel_t ft,
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rtc_osc_mode_t x32kmd, const sys_cfg_rtc_t* sys_cfg)
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{
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SYS_RTC_SqwavInit(sys_cfg); // Set the Output pins for the squarewave.
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_WE; // Allow writing to registers
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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if (sqe == SQUARE_WAVE_ENABLED) {
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if (ft == F_32KHZ){ // if 32KHz output is selected...
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rtc->oscctrl |= MXC_F_RTC_OSCCTRL_OUT32K; // Enable 32KHz wave
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_SQE; // Enable output on the pin
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} else { // if 1Hz, 512Hz, 4KHz output is selected
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rtc->oscctrl &= ~MXC_F_RTC_OSCCTRL_OUT32K; // Must make sure that the 32KHz is disabled
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~(MXC_F_RTC_CTRL_FT | MXC_F_RTC_CTRL_X32KMD);
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= (MXC_F_RTC_CTRL_SQE | ft | x32kmd); // Enable Sq. wave,
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}
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_RTCE; // Enable Real Time Clock
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} else { // Turn off the square wave output on the pin
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rtc->oscctrl &= ~MXC_F_RTC_OSCCTRL_OUT32K; // Must make sure that the 32KHz is disabled
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_SQE; // No sq. wave output
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}
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_WE; // Disable Writing to register
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_Trim(mxc_rtc_regs_t *rtc, int8_t trim)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl |= MXC_F_RTC_CTRL_WE;
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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MXC_SETFIELD(rtc->trim, MXC_F_RTC_TRIM_TRIM, trim << MXC_F_RTC_TRIM_TRIM_POS);
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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rtc->ctrl &= ~MXC_F_RTC_CTRL_WE; // Disable Writing to register
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_CheckBusy(void)
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{
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// Time-out transfer if it takes > BUSY_TIMEOUT microseconds
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mxc_delay_start(MXC_DELAY_USEC(BUSY_TIMEOUT));
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while (RTC_IS_BUSY) {
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if (mxc_delay_check() != E_BUSY){
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return E_BUSY;
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}
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}
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mxc_delay_stop();
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_GetFlags(void)
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{
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return MXC_RTC->ctrl & (MXC_F_RTC_CTRL_ALDF | MXC_F_RTC_CTRL_ALSF | MXC_F_RTC_CTRL_RDY);
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}
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// *****************************************************************************
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int RTC_ClearFlags(int flags)
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{
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if (RTC_CheckBusy()) {
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return E_BUSY;
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}
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MXC_RTC->ctrl &= ~(flags & (MXC_F_RTC_CTRL_ALDF | MXC_F_RTC_CTRL_ALSF | MXC_F_RTC_CTRL_RDY));
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return E_SUCCESS;
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}
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// *****************************************************************************
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int RTC_GetSubSecond(void)
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{
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#if TARGET == 32650
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int ssec;
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if(ChipRevision > 0xA1){
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ssec = ((MXC_PWRSEQ->lpcn >> 12)& 0xF00) | (MXC_RTC->ssec & 0xFF);
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}else{
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ssec = MXC_RTC->ssec;
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}
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return ssec;
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#else
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return MXC_RTC->ssec;
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#endif
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}
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// *****************************************************************************
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int RTC_GetSecond(void)
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{
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return MXC_RTC->sec;
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}
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// *****************************************************************************
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int RTC_GetTime(uint32_t* sec, uint32_t* subsec)
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{
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uint32_t temp_sec;
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do {
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// Check if an update is about to happen.
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if(!(MXC_RTC->ctrl & MXC_F_RTC_CTRL_RDY)) {
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return E_BUSY;
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}
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// Read the seconds count.
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temp_sec = RTC_GetSecond();
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// Check if an update is about to happen.
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if(!(MXC_RTC->ctrl & MXC_F_RTC_CTRL_RDY)) {
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return E_BUSY;
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}
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// Read the sub-seconds count.
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*subsec = RTC_GetSubSecond();
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// Check if an update is about to happen.
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if(!(MXC_RTC->ctrl & MXC_F_RTC_CTRL_RDY)) {
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return E_BUSY;
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}
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// Read the seconds count.
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*sec = RTC_GetSecond();
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// Repeat until a steady state is reached.
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} while (temp_sec != *sec);
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return E_NO_ERROR;
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}
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// *****************************************************************************
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int RTC_IsEnabled(void)
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{
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return RTC_IS_ENABLED;
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}
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