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Last commit 20 Feb 2019 by mbed official

targets/hal/TARGET_NXP/TARGET_LPC43XX/rtc_api.c@463:5c73c3744533, 2015-02-03 (annotated)

Committer:
mbed_official
Date:
Tue Feb 03 17:00:07 2015 +0000
Revision:
463:5c73c3744533
Parent:
441:d2c15dda23c1 
Synchronized with git revision 134a67aab259d410373367cb96b73420b390d385



Full URL: https://github.com/mbedmicro/mbed/commit/134a67aab259d410373367cb96b73420b390d385/

Who changed what in which revision?

UserRevisionLine numberNew contents of line
bogdanm 20:4263a77256ae 1 /* mbed Microcontroller Library
bogdanm 20:4263a77256ae 2 * Copyright (c) 2006-2013 ARM Limited
bogdanm 20:4263a77256ae 3 *
bogdanm 20:4263a77256ae 4 * Licensed under the Apache License, Version 2.0 (the "License");
bogdanm 20:4263a77256ae 5 * you may not use this file except in compliance with the License.
bogdanm 20:4263a77256ae 6 * You may obtain a copy of the License at
bogdanm 20:4263a77256ae 7 *
bogdanm 20:4263a77256ae 8 * http://www.apache.org/licenses/LICENSE-2.0
bogdanm 20:4263a77256ae 9 *
bogdanm 20:4263a77256ae 10 * Unless required by applicable law or agreed to in writing, software
bogdanm 20:4263a77256ae 11 * distributed under the License is distributed on an "AS IS" BASIS,
bogdanm 20:4263a77256ae 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
bogdanm 20:4263a77256ae 13 * See the License for the specific language governing permissions and
bogdanm 20:4263a77256ae 14 * limitations under the License.
bogdanm 20:4263a77256ae 15 *
bogdanm 20:4263a77256ae 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
bogdanm 20:4263a77256ae 17 */
bogdanm 20:4263a77256ae 18 #include "rtc_api.h"
bogdanm 20:4263a77256ae 19
bogdanm 20:4263a77256ae 20 // ensure rtc is running (unchanged if already running)
bogdanm 20:4263a77256ae 21
bogdanm 20:4263a77256ae 22 /* Setup the RTC based on a time structure, ensuring RTC is enabled
bogdanm 20:4263a77256ae 23 *
bogdanm 20:4263a77256ae 24 * Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock
bogdanm 20:4263a77256ae 25 * - We want to use the 32khz clock, allowing for sleep mode
bogdanm 20:4263a77256ae 26 *
bogdanm 20:4263a77256ae 27 * Most registers are not changed by a Reset
bogdanm 20:4263a77256ae 28 * - We must initialize these registers between power-on and setting the RTC into operation
bogdanm 20:4263a77256ae 29
bogdanm 20:4263a77256ae 30 * Clock Control Register
bogdanm 20:4263a77256ae 31 * RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled
bogdanm 20:4263a77256ae 32 * RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset
bogdanm 20:4263a77256ae 33 * RTC_CCR[4] : Clock Source - 0 = Prescaler, 1 = 32k Xtal
bogdanm 20:4263a77256ae 34 *
bogdanm 20:4263a77256ae 35 * The RTC may already be running, so we should set it up
bogdanm 20:4263a77256ae 36 * without impacting if it is the case
bogdanm 20:4263a77256ae 37 */
mbed_official 441:d2c15dda23c1 38
bogdanm 20:4263a77256ae 39 void rtc_init(void) {
mbed_official 441:d2c15dda23c1 40 // Return, if already enabled
mbed_official 441:d2c15dda23c1 41 if (LPC_RTC->CCR & 1)
mbed_official 441:d2c15dda23c1 42 return;
bogdanm 20:4263a77256ae 43
mbed_official 441:d2c15dda23c1 44 // Enable 1kHz output of 32kHz oscillator
mbed_official 441:d2c15dda23c1 45 LPC_CREG->CREG0 &= ~((1 << 3) | (1 << 2));
mbed_official 441:d2c15dda23c1 46 LPC_CREG->CREG0 |= (0x03 << 6) | (1 << 1) | (1 << 0);
mbed_official 441:d2c15dda23c1 47
mbed_official 441:d2c15dda23c1 48 // Enable RTC
mbed_official 441:d2c15dda23c1 49 do {
mbed_official 441:d2c15dda23c1 50 LPC_RTC->CCR |= 1 << 0;
mbed_official 441:d2c15dda23c1 51 } while ((LPC_RTC->CCR & 1) == 0);
bogdanm 20:4263a77256ae 52 }
bogdanm 20:4263a77256ae 53
bogdanm 20:4263a77256ae 54 void rtc_free(void) {
bogdanm 20:4263a77256ae 55 // [TODO]
bogdanm 20:4263a77256ae 56 }
bogdanm 20:4263a77256ae 57
bogdanm 20:4263a77256ae 58 /*
bogdanm 20:4263a77256ae 59 * Little check routine to see if the RTC has been enabled
bogdanm 20:4263a77256ae 60 *
bogdanm 20:4263a77256ae 61 * Clock Control Register
bogdanm 20:4263a77256ae 62 * RTC_CCR[0] : 0 = Disabled, 1 = Enabled
bogdanm 20:4263a77256ae 63 *
bogdanm 20:4263a77256ae 64 */
bogdanm 20:4263a77256ae 65 int rtc_isenabled(void) {
bogdanm 20:4263a77256ae 66 return(((LPC_RTC->CCR) & 0x01) != 0);
bogdanm 20:4263a77256ae 67 }
bogdanm 20:4263a77256ae 68
bogdanm 20:4263a77256ae 69 /*
bogdanm 20:4263a77256ae 70 * RTC Registers
bogdanm 20:4263a77256ae 71 * RTC_SEC Seconds 0-59
bogdanm 20:4263a77256ae 72 * RTC_MIN Minutes 0-59
bogdanm 20:4263a77256ae 73 * RTC_HOUR Hour 0-23
bogdanm 20:4263a77256ae 74 * RTC_DOM Day of Month 1-28..31
bogdanm 20:4263a77256ae 75 * RTC_DOW Day of Week 0-6
bogdanm 20:4263a77256ae 76 * RTC_DOY Day of Year 1-365
bogdanm 20:4263a77256ae 77 * RTC_MONTH Month 1-12
bogdanm 20:4263a77256ae 78 * RTC_YEAR Year 0-4095
bogdanm 20:4263a77256ae 79 *
bogdanm 20:4263a77256ae 80 * struct tm
bogdanm 20:4263a77256ae 81 * tm_sec seconds after the minute 0-61
bogdanm 20:4263a77256ae 82 * tm_min minutes after the hour 0-59
bogdanm 20:4263a77256ae 83 * tm_hour hours since midnight 0-23
bogdanm 20:4263a77256ae 84 * tm_mday day of the month 1-31
bogdanm 20:4263a77256ae 85 * tm_mon months since January 0-11
bogdanm 20:4263a77256ae 86 * tm_year years since 1900
bogdanm 20:4263a77256ae 87 * tm_wday days since Sunday 0-6
bogdanm 20:4263a77256ae 88 * tm_yday days since January 1 0-365
bogdanm 20:4263a77256ae 89 * tm_isdst Daylight Saving Time flag
bogdanm 20:4263a77256ae 90 */
bogdanm 20:4263a77256ae 91 time_t rtc_read(void) {
bogdanm 20:4263a77256ae 92 // Setup a tm structure based on the RTC
bogdanm 20:4263a77256ae 93 struct tm timeinfo;
bogdanm 20:4263a77256ae 94 timeinfo.tm_sec = LPC_RTC->TIME[RTC_TIMETYPE_SECOND];
bogdanm 20:4263a77256ae 95 timeinfo.tm_min = LPC_RTC->TIME[RTC_TIMETYPE_MINUTE];
bogdanm 20:4263a77256ae 96 timeinfo.tm_hour = LPC_RTC->TIME[RTC_TIMETYPE_HOUR];
bogdanm 20:4263a77256ae 97 timeinfo.tm_mday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFMONTH];
bogdanm 20:4263a77256ae 98 timeinfo.tm_wday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFWEEK];
bogdanm 20:4263a77256ae 99 timeinfo.tm_yday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFYEAR];
bogdanm 20:4263a77256ae 100 timeinfo.tm_mon = LPC_RTC->TIME[RTC_TIMETYPE_MONTH] - 1;
bogdanm 20:4263a77256ae 101 timeinfo.tm_year = LPC_RTC->TIME[RTC_TIMETYPE_YEAR] - 1900;
bogdanm 20:4263a77256ae 102
bogdanm 20:4263a77256ae 103 // Convert to timestamp
bogdanm 20:4263a77256ae 104 time_t t = mktime(&timeinfo);
bogdanm 20:4263a77256ae 105
bogdanm 20:4263a77256ae 106 return t;
bogdanm 20:4263a77256ae 107 }
bogdanm 20:4263a77256ae 108
bogdanm 20:4263a77256ae 109 void rtc_write(time_t t) {
bogdanm 20:4263a77256ae 110 // Convert the time in to a tm
bogdanm 20:4263a77256ae 111 struct tm *timeinfo = localtime(&t);
bogdanm 20:4263a77256ae 112
bogdanm 20:4263a77256ae 113 // Pause clock, and clear counter register (clears us count)
bogdanm 20:4263a77256ae 114 LPC_RTC->CCR |= 2;
bogdanm 20:4263a77256ae 115
bogdanm 20:4263a77256ae 116 // Set the RTC
bogdanm 20:4263a77256ae 117 LPC_RTC->TIME[RTC_TIMETYPE_SECOND] = timeinfo->tm_sec;
bogdanm 20:4263a77256ae 118 LPC_RTC->TIME[RTC_TIMETYPE_MINUTE] = timeinfo->tm_min;
bogdanm 20:4263a77256ae 119 LPC_RTC->TIME[RTC_TIMETYPE_HOUR] = timeinfo->tm_hour;
bogdanm 20:4263a77256ae 120 LPC_RTC->TIME[RTC_TIMETYPE_DAYOFMONTH] = timeinfo->tm_mday;
bogdanm 20:4263a77256ae 121 LPC_RTC->TIME[RTC_TIMETYPE_DAYOFWEEK] = timeinfo->tm_wday;
bogdanm 20:4263a77256ae 122 LPC_RTC->TIME[RTC_TIMETYPE_DAYOFYEAR] = timeinfo->tm_yday;
bogdanm 20:4263a77256ae 123 LPC_RTC->TIME[RTC_TIMETYPE_MONTH] = timeinfo->tm_mon + 1;
bogdanm 20:4263a77256ae 124 LPC_RTC->TIME[RTC_TIMETYPE_YEAR] = timeinfo->tm_year + 1900;
bogdanm 20:4263a77256ae 125
bogdanm 20:4263a77256ae 126 // Restart clock
bogdanm 20:4263a77256ae 127 LPC_RTC->CCR &= ~((uint32_t)2);
bogdanm 20:4263a77256ae 128 }