mirror of https://github.com/ARMmbed/mbed-os.git
197 lines
4.1 KiB
C
197 lines
4.1 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2020 ARM Limited
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "mbed_assert.h"
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#include "device.h"
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#if DEVICE_RTC
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#include "rtc_api.h"
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#include "iodefine.h"
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#include "mbed_drv_cfg.h"
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#ifdef USE_RTCX1_CLK
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#elif defined(USE_EXTAL_CLK)
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#else
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#error Select RTC clock input !
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#endif
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#define READ_LOOP_MAX (2000)
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#define TIME_ERROR_VAL (0u)
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/*
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* Setup the RTC based on a time structure.
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* The rtc_init function should be executed first.
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* [in]
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* None.
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* [out]
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* None.
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*/
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void rtc_init(void)
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{
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volatile int i;
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CPG.STBCR5.BIT.MSTP52 = 0;
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// Set control register
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#if defined(USE_RTCX1_CLK)
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RTC_BCNT1.RCR4.BIT.RCKSEL = 0;
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RTC_BCNT1.RCR3.BIT.RTCEN = 1;
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#elif defined(USE_EXTAL_CLK)
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PMG.RTCXTALSEL.BIT.RTC1XT = 1;
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RTC_BCNT1.RCR4.BIT.RCKSEL = 1;
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RTC_BCNT1.RCR3.BIT.RTCEN = 0;
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#endif
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i = 0;
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while (i < 1000) {
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i++;
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}
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RTC_BCNT1.RCR2.BIT.START = 0;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.START != 0); i++) {
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;
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}
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#if defined(USE_EXTAL_CLK)
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// Clockin = 24MHz
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RTC_BCNT1.RFRH.WORD = 0x0001;
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RTC_BCNT1.RFRL.WORD = 0x6E35;
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#endif
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RTC_BCNT1.RCR2.BIT.CNTMD = 1;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.CNTMD != 1); i++) {
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;
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}
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RTC_BCNT1.RCR2.BIT.RESET = 1;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.RESET != 0); i++) {
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;
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}
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RTC_BCNT1.RCR1.BIT.AIE = 1;
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RTC_BCNT1.RCR1.BIT.PIE = 0;
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RTC_BCNT1.RCR2.BIT.START = 1;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.START != 1); i++) {
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;
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}
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}
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/*
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* Release the RTC based on a time structure.
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* @note This function does not stop the RTC from counting
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* [in]
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* None.
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* [out]
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* None.
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*/
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void rtc_free(void)
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{
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#if defined(USE_EXTAL_CLK)
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PMG.RTCXTALSEL.BIT.RTC1XT = 0;
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#endif
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}
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/*
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* Check the RTC has been enabled.
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* Clock Control Register RTC_BCNT1.RCR1.BYTE(bit3): 0 = Disabled, 1 = Enabled.
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* [in]
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* None.
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* [out]
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* 0:Disabled, 1:Enabled.
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*/
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int rtc_isenabled(void)
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{
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int ret_val = 0;
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if (RTC_BCNT1.RCR2.BIT.START == 1) { // RTC ON ?
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ret_val = 1;
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}
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return ret_val;
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}
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/*
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* RTC read function.
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* [in]
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* None.
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* [out]
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* UNIX timestamp value.
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*/
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time_t rtc_read(void)
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{
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time_t t;
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if (rtc_isenabled() != 0) {
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RTC_BCNT1.RCR1.BIT.CIE = 0; // CIE = 0
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do {
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RTC_BCNT1.RSR.BIT.CF = 0;
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// Read RTC register
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t = ((time_t)RTC_BCNT1.BCNT0.BYTE << 0)
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| ((time_t)RTC_BCNT1.BCNT1.BYTE << 8)
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| ((time_t)RTC_BCNT1.BCNT2.BYTE << 16)
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| ((time_t)RTC_BCNT1.BCNT3.BYTE << 24);
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} while (RTC_BCNT1.RSR.BIT.CF != 0);
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} else {
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// Error
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t = TIME_ERROR_VAL;
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}
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return t;
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}
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/*
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* RTC write function
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* [in]
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* t:UNIX timestamp value
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* [out]
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* None.
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*/
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void rtc_write(time_t t)
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{
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volatile int i;
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if (rtc_isenabled() != 0) {
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RTC_BCNT1.RCR2.BIT.START = 0;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.START != 0); i++) {
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;
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}
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RTC_BCNT1.RCR2.BIT.RESET = 1;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.RESET != 0); i++) {
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;
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}
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RTC_BCNT1.BCNT0.BYTE = (uint8_t)(t >> 0);
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RTC_BCNT1.BCNT1.BYTE = (uint8_t)(t >> 8);
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RTC_BCNT1.BCNT2.BYTE = (uint8_t)(t >> 16);
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RTC_BCNT1.BCNT3.BYTE = (uint8_t)(t >> 24);
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RTC_BCNT1.RCR2.BIT.START = 1;
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for (i = 0; (i < READ_LOOP_MAX) && (RTC_BCNT1.RCR2.BIT.START != 1); i++) {
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;
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}
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}
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}
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#endif /* DEVICE_RTC */
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