EL4121 Embedded System / mbed-os

mbed-os

Dependents:   cobaLCDJoyMotor_Thread odometry_omni_3roda_v3 odometry_omni_3roda_v1 odometry_omni_3roda_v2 ... more

targets/TARGET_NXP/TARGET_LPC43XX/rtc_api.c@0:b74591d5ab33, 2017-12-11 (annotated)

Committer:
be_bryan
Date:
Mon Dec 11 17:54:04 2017 +0000
Revision:
0:b74591d5ab33
motor ++

Who changed what in which revision?

UserRevisionLine numberNew contents of line
be_bryan 0:b74591d5ab33 1 /* mbed Microcontroller Library
be_bryan 0:b74591d5ab33 2 * Copyright (c) 2006-2013 ARM Limited
be_bryan 0:b74591d5ab33 3 *
be_bryan 0:b74591d5ab33 4 * Licensed under the Apache License, Version 2.0 (the "License");
be_bryan 0:b74591d5ab33 5 * you may not use this file except in compliance with the License.
be_bryan 0:b74591d5ab33 6 * You may obtain a copy of the License at
be_bryan 0:b74591d5ab33 7 *
be_bryan 0:b74591d5ab33 8 * http://www.apache.org/licenses/LICENSE-2.0
be_bryan 0:b74591d5ab33 9 *
be_bryan 0:b74591d5ab33 10 * Unless required by applicable law or agreed to in writing, software
be_bryan 0:b74591d5ab33 11 * distributed under the License is distributed on an "AS IS" BASIS,
be_bryan 0:b74591d5ab33 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
be_bryan 0:b74591d5ab33 13 * See the License for the specific language governing permissions and
be_bryan 0:b74591d5ab33 14 * limitations under the License.
be_bryan 0:b74591d5ab33 15 *
be_bryan 0:b74591d5ab33 16 * Ported to NXP LPC43XX by Micromint USA <support@micromint.com>
be_bryan 0:b74591d5ab33 17 */
be_bryan 0:b74591d5ab33 18 #include "rtc_api.h"
be_bryan 0:b74591d5ab33 19 #include "mbed_mktime.h"
be_bryan 0:b74591d5ab33 20
be_bryan 0:b74591d5ab33 21 // ensure rtc is running (unchanged if already running)
be_bryan 0:b74591d5ab33 22
be_bryan 0:b74591d5ab33 23 /* Setup the RTC based on a time structure, ensuring RTC is enabled
be_bryan 0:b74591d5ab33 24 *
be_bryan 0:b74591d5ab33 25 * Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock
be_bryan 0:b74591d5ab33 26 * - We want to use the 32khz clock, allowing for sleep mode
be_bryan 0:b74591d5ab33 27 *
be_bryan 0:b74591d5ab33 28 * Most registers are not changed by a Reset
be_bryan 0:b74591d5ab33 29 * - We must initialize these registers between power-on and setting the RTC into operation
be_bryan 0:b74591d5ab33 30
be_bryan 0:b74591d5ab33 31 * Clock Control Register
be_bryan 0:b74591d5ab33 32 * RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled
be_bryan 0:b74591d5ab33 33 * RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset
be_bryan 0:b74591d5ab33 34 * RTC_CCR[4] : Clock Source - 0 = Prescaler, 1 = 32k Xtal
be_bryan 0:b74591d5ab33 35 *
be_bryan 0:b74591d5ab33 36 * The RTC may already be running, so we should set it up
be_bryan 0:b74591d5ab33 37 * without impacting if it is the case
be_bryan 0:b74591d5ab33 38 */
be_bryan 0:b74591d5ab33 39
be_bryan 0:b74591d5ab33 40 void rtc_init(void) {
be_bryan 0:b74591d5ab33 41 // Return, if already enabled
be_bryan 0:b74591d5ab33 42 if (LPC_RTC->CCR & 1)
be_bryan 0:b74591d5ab33 43 return;
be_bryan 0:b74591d5ab33 44
be_bryan 0:b74591d5ab33 45 // Enable 1kHz output of 32kHz oscillator
be_bryan 0:b74591d5ab33 46 LPC_CREG->CREG0 &= ~((1 << 3) | (1 << 2));
be_bryan 0:b74591d5ab33 47 LPC_CREG->CREG0 |= (0x03 << 6) | (1 << 1) | (1 << 0);
be_bryan 0:b74591d5ab33 48
be_bryan 0:b74591d5ab33 49 // Enable RTC
be_bryan 0:b74591d5ab33 50 do {
be_bryan 0:b74591d5ab33 51 LPC_RTC->CCR |= 1 << 0;
be_bryan 0:b74591d5ab33 52 } while ((LPC_RTC->CCR & 1) == 0);
be_bryan 0:b74591d5ab33 53 }
be_bryan 0:b74591d5ab33 54
be_bryan 0:b74591d5ab33 55 void rtc_free(void) {
be_bryan 0:b74591d5ab33 56 // [TODO]
be_bryan 0:b74591d5ab33 57 }
be_bryan 0:b74591d5ab33 58
be_bryan 0:b74591d5ab33 59 /*
be_bryan 0:b74591d5ab33 60 * Little check routine to see if the RTC has been enabled
be_bryan 0:b74591d5ab33 61 *
be_bryan 0:b74591d5ab33 62 * Clock Control Register
be_bryan 0:b74591d5ab33 63 * RTC_CCR[0] : 0 = Disabled, 1 = Enabled
be_bryan 0:b74591d5ab33 64 *
be_bryan 0:b74591d5ab33 65 */
be_bryan 0:b74591d5ab33 66 int rtc_isenabled(void) {
be_bryan 0:b74591d5ab33 67 return(((LPC_RTC->CCR) & 0x01) != 0);
be_bryan 0:b74591d5ab33 68 }
be_bryan 0:b74591d5ab33 69
be_bryan 0:b74591d5ab33 70 /*
be_bryan 0:b74591d5ab33 71 * RTC Registers
be_bryan 0:b74591d5ab33 72 * RTC_SEC Seconds 0-59
be_bryan 0:b74591d5ab33 73 * RTC_MIN Minutes 0-59
be_bryan 0:b74591d5ab33 74 * RTC_HOUR Hour 0-23
be_bryan 0:b74591d5ab33 75 * RTC_DOM Day of Month 1-28..31
be_bryan 0:b74591d5ab33 76 * RTC_DOW Day of Week 0-6
be_bryan 0:b74591d5ab33 77 * RTC_DOY Day of Year 1-365
be_bryan 0:b74591d5ab33 78 * RTC_MONTH Month 1-12
be_bryan 0:b74591d5ab33 79 * RTC_YEAR Year 0-4095
be_bryan 0:b74591d5ab33 80 *
be_bryan 0:b74591d5ab33 81 * struct tm
be_bryan 0:b74591d5ab33 82 * tm_sec seconds after the minute 0-61
be_bryan 0:b74591d5ab33 83 * tm_min minutes after the hour 0-59
be_bryan 0:b74591d5ab33 84 * tm_hour hours since midnight 0-23
be_bryan 0:b74591d5ab33 85 * tm_mday day of the month 1-31
be_bryan 0:b74591d5ab33 86 * tm_mon months since January 0-11
be_bryan 0:b74591d5ab33 87 * tm_year years since 1900
be_bryan 0:b74591d5ab33 88 * tm_wday days since Sunday 0-6
be_bryan 0:b74591d5ab33 89 * tm_yday days since January 1 0-365
be_bryan 0:b74591d5ab33 90 * tm_isdst Daylight Saving Time flag
be_bryan 0:b74591d5ab33 91 */
be_bryan 0:b74591d5ab33 92 time_t rtc_read(void) {
be_bryan 0:b74591d5ab33 93 // Setup a tm structure based on the RTC
be_bryan 0:b74591d5ab33 94 struct tm timeinfo;
be_bryan 0:b74591d5ab33 95 timeinfo.tm_sec = LPC_RTC->TIME[RTC_TIMETYPE_SECOND];
be_bryan 0:b74591d5ab33 96 timeinfo.tm_min = LPC_RTC->TIME[RTC_TIMETYPE_MINUTE];
be_bryan 0:b74591d5ab33 97 timeinfo.tm_hour = LPC_RTC->TIME[RTC_TIMETYPE_HOUR];
be_bryan 0:b74591d5ab33 98 timeinfo.tm_mday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFMONTH];
be_bryan 0:b74591d5ab33 99 timeinfo.tm_wday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFWEEK];
be_bryan 0:b74591d5ab33 100 timeinfo.tm_yday = LPC_RTC->TIME[RTC_TIMETYPE_DAYOFYEAR];
be_bryan 0:b74591d5ab33 101 timeinfo.tm_mon = LPC_RTC->TIME[RTC_TIMETYPE_MONTH] - 1;
be_bryan 0:b74591d5ab33 102 timeinfo.tm_year = LPC_RTC->TIME[RTC_TIMETYPE_YEAR] - 1900;
be_bryan 0:b74591d5ab33 103
be_bryan 0:b74591d5ab33 104 // Convert to timestamp
be_bryan 0:b74591d5ab33 105 time_t t = _rtc_mktime(&timeinfo);
be_bryan 0:b74591d5ab33 106
be_bryan 0:b74591d5ab33 107 return t;
be_bryan 0:b74591d5ab33 108 }
be_bryan 0:b74591d5ab33 109
be_bryan 0:b74591d5ab33 110 void rtc_write(time_t t) {
be_bryan 0:b74591d5ab33 111 // Convert the time in to a tm
be_bryan 0:b74591d5ab33 112 struct tm timeinfo;
be_bryan 0:b74591d5ab33 113 if (_rtc_localtime(t, &timeinfo) == false) {
be_bryan 0:b74591d5ab33 114 return;
be_bryan 0:b74591d5ab33 115 }
be_bryan 0:b74591d5ab33 116
be_bryan 0:b74591d5ab33 117 // Pause clock, and clear counter register (clears us count)
be_bryan 0:b74591d5ab33 118 LPC_RTC->CCR |= 2;
be_bryan 0:b74591d5ab33 119
be_bryan 0:b74591d5ab33 120 // Set the RTC
be_bryan 0:b74591d5ab33 121 LPC_RTC->TIME[RTC_TIMETYPE_SECOND] = timeinfo.tm_sec;
be_bryan 0:b74591d5ab33 122 LPC_RTC->TIME[RTC_TIMETYPE_MINUTE] = timeinfo.tm_min;
be_bryan 0:b74591d5ab33 123 LPC_RTC->TIME[RTC_TIMETYPE_HOUR] = timeinfo.tm_hour;
be_bryan 0:b74591d5ab33 124 LPC_RTC->TIME[RTC_TIMETYPE_DAYOFMONTH] = timeinfo.tm_mday;
be_bryan 0:b74591d5ab33 125 LPC_RTC->TIME[RTC_TIMETYPE_DAYOFWEEK] = timeinfo.tm_wday;
be_bryan 0:b74591d5ab33 126 LPC_RTC->TIME[RTC_TIMETYPE_DAYOFYEAR] = timeinfo.tm_yday;
be_bryan 0:b74591d5ab33 127 LPC_RTC->TIME[RTC_TIMETYPE_MONTH] = timeinfo.tm_mon + 1;
be_bryan 0:b74591d5ab33 128 LPC_RTC->TIME[RTC_TIMETYPE_YEAR] = timeinfo.tm_year + 1900;
be_bryan 0:b74591d5ab33 129
be_bryan 0:b74591d5ab33 130 // Restart clock
be_bryan 0:b74591d5ab33 131 LPC_RTC->CCR &= ~((uint32_t)2);
be_bryan 0:b74591d5ab33 132 }