mirror of https://github.com/ARMmbed/mbed-os.git
129 lines
4.1 KiB
C
129 lines
4.1 KiB
C
/* mbed Microcontroller Library
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* Copyright (c) 2006-2013 ARM Limited
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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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* Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
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*/
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#include "rtc_api.h"
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// ensure rtc is running (unchanged if already running)
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/* Setup the RTC based on a time structure, ensuring RTC is enabled
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*
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* Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock
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* - We want to use the 32khz clock, allowing for sleep mode
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*
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* Most registers are not changed by a Reset
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* - We must initialize these registers between power-on and setting the RTC into operation
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* Clock Control Register
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* RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled
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* RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset
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* RTC_CCR[4] : Clock Source - 0 = Prescaler, 1 = 32k Xtal
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*
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* The RTC may already be running, so we should set it up
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* without impacting if it is the case
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*/
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void rtc_init(void) {
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// Return, if already enabled
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if (LPC_RTC->CCR & 1)
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return;
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// Enable 1kHz output of 32kHz oscillator
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LPC_CREG->CREG0 &= ~((1 << 3) | (1 << 2));
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LPC_CREG->CREG0 |= (0x03 << 6) | (1 << 1) | (1 << 0);
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// Enable RTC
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do {
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LPC_RTC->CCR |= 1 << 0;
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} while ((LPC_RTC->CCR & 1) == 0);
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}
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void rtc_free(void) {
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// [TODO]
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}
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/*
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* Little check routine to see if the RTC has been enabled
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*
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* Clock Control Register
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* RTC_CCR[0] : 0 = Disabled, 1 = Enabled
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*
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*/
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int rtc_isenabled(void) {
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return(((LPC_RTC->CCR) & 0x01) != 0);
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}
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/*
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* RTC Registers
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* RTC_SEC Seconds 0-59
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* RTC_MIN Minutes 0-59
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* RTC_HOUR Hour 0-23
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* RTC_DOM Day of Month 1-28..31
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* RTC_DOW Day of Week 0-6
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* RTC_DOY Day of Year 1-365
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* RTC_MONTH Month 1-12
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* RTC_YEAR Year 0-4095
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*
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* struct tm
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* tm_sec seconds after the minute 0-61
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* tm_min minutes after the hour 0-59
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* tm_hour hours since midnight 0-23
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* tm_mday day of the month 1-31
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* tm_mon months since January 0-11
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* tm_year years since 1900
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* tm_wday days since Sunday 0-6
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* tm_yday days since January 1 0-365
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* tm_isdst Daylight Saving Time flag
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*/
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time_t rtc_read(void) {
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// Setup a tm structure based on the RTC
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struct tm timeinfo;
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timeinfo.tm_sec = LPC_RTC->TIME[RTC_TIMETYPE_SECOND];
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timeinfo.tm_min = LPC_RTC->TIME[RTC_TIMETYPE_MINUTE];
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timeinfo.tm_hour = LPC_RTC->TIME[RTC_TIMETYPE_HOUR];
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timeinfo.tm_mday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFMONTH];
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timeinfo.tm_wday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFWEEK];
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timeinfo.tm_yday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFYEAR];
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timeinfo.tm_mon = LPC_RTC->TIME[RTC_TIMETYPE_MONTH] - 1;
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timeinfo.tm_year = LPC_RTC->TIME[RTC_TIMETYPE_YEAR] - 1900;
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// Convert to timestamp
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time_t t = mktime(&timeinfo);
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return t;
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}
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void rtc_write(time_t t) {
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// Convert the time in to a tm
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struct tm *timeinfo = localtime(&t);
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// Pause clock, and clear counter register (clears us count)
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LPC_RTC->CCR |= 2;
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// Set the RTC
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LPC_RTC->TIME[RTC_TIMETYPE_SECOND] = timeinfo->tm_sec;
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LPC_RTC->TIME[RTC_TIMETYPE_MINUTE] = timeinfo->tm_min;
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LPC_RTC->TIME[RTC_TIMETYPE_HOUR] = timeinfo->tm_hour;
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LPC_RTC->TIME[RTC_TIMETYPE_DAYOFMONTH] = timeinfo->tm_mday;
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LPC_RTC->TIME[RTC_TIMETYPE_DAYOFWEEK] = timeinfo->tm_wday;
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LPC_RTC->TIME[RTC_TIMETYPE_DAYOFYEAR] = timeinfo->tm_yday;
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LPC_RTC->TIME[RTC_TIMETYPE_MONTH] = timeinfo->tm_mon + 1;
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LPC_RTC->TIME[RTC_TIMETYPE_YEAR] = timeinfo->tm_year + 1900;
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// Restart clock
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LPC_RTC->CCR &= ~((uint32_t)2);
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}
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