ON Semiconductor / mbed-os

5.2.1 - Updated I2C files

Dependents:   mbed-TFT-example-NCS36510 mbed-Accelerometer-example-NCS36510 mbed-Accelerometer-example-NCS36510

targets/TARGET_NXP/TARGET_LPC408X/rtc_api.c@0:098463de4c5d, 2017-01-25 (annotated)

Committer:
group-onsemi
Date:
Wed Jan 25 20:34:15 2017 +0000
Revision:
0:098463de4c5d
Initial commit

Who changed what in which revision?

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group-onsemi 0:098463de4c5d 1 /* mbed Microcontroller Library
group-onsemi 0:098463de4c5d 2 * Copyright (c) 2006-2013 ARM Limited
group-onsemi 0:098463de4c5d 3 *
group-onsemi 0:098463de4c5d 4 * Licensed under the Apache License, Version 2.0 (the "License");
group-onsemi 0:098463de4c5d 5 * you may not use this file except in compliance with the License.
group-onsemi 0:098463de4c5d 6 * You may obtain a copy of the License at
group-onsemi 0:098463de4c5d 7 *
group-onsemi 0:098463de4c5d 8 * http://www.apache.org/licenses/LICENSE-2.0
group-onsemi 0:098463de4c5d 9 *
group-onsemi 0:098463de4c5d 10 * Unless required by applicable law or agreed to in writing, software
group-onsemi 0:098463de4c5d 11 * distributed under the License is distributed on an "AS IS" BASIS,
group-onsemi 0:098463de4c5d 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
group-onsemi 0:098463de4c5d 13 * See the License for the specific language governing permissions and
group-onsemi 0:098463de4c5d 14 * limitations under the License.
group-onsemi 0:098463de4c5d 15 */
group-onsemi 0:098463de4c5d 16 #include "rtc_api.h"
group-onsemi 0:098463de4c5d 17
group-onsemi 0:098463de4c5d 18 // ensure rtc is running (unchanged if already running)
group-onsemi 0:098463de4c5d 19
group-onsemi 0:098463de4c5d 20 /* Setup the RTC based on a time structure, ensuring RTC is enabled
group-onsemi 0:098463de4c5d 21 *
group-onsemi 0:098463de4c5d 22 * Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock
group-onsemi 0:098463de4c5d 23 * - We want to use the 32khz clock, allowing for sleep mode
group-onsemi 0:098463de4c5d 24 *
group-onsemi 0:098463de4c5d 25 * Most registers are not changed by a Reset
group-onsemi 0:098463de4c5d 26 * - We must initialize these registers between power-on and setting the RTC into operation
group-onsemi 0:098463de4c5d 27
group-onsemi 0:098463de4c5d 28 * Clock Control Register
group-onsemi 0:098463de4c5d 29 * RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled
group-onsemi 0:098463de4c5d 30 * RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset
group-onsemi 0:098463de4c5d 31 *
group-onsemi 0:098463de4c5d 32 * The RTC may already be running, so we should set it up
group-onsemi 0:098463de4c5d 33 * without impacting if it is the case
group-onsemi 0:098463de4c5d 34 */
group-onsemi 0:098463de4c5d 35 void rtc_init(void) {
group-onsemi 0:098463de4c5d 36 LPC_SC->PCONP |= 0x200; // Ensure power is on
group-onsemi 0:098463de4c5d 37 LPC_RTC->CCR = 0x00;
group-onsemi 0:098463de4c5d 38
group-onsemi 0:098463de4c5d 39 LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled
group-onsemi 0:098463de4c5d 40 }
group-onsemi 0:098463de4c5d 41
group-onsemi 0:098463de4c5d 42 void rtc_free(void) {
group-onsemi 0:098463de4c5d 43 // [TODO]
group-onsemi 0:098463de4c5d 44 }
group-onsemi 0:098463de4c5d 45
group-onsemi 0:098463de4c5d 46 /*
group-onsemi 0:098463de4c5d 47 * Little check routine to see if the RTC has been enabled
group-onsemi 0:098463de4c5d 48 *
group-onsemi 0:098463de4c5d 49 * Clock Control Register
group-onsemi 0:098463de4c5d 50 * RTC_CCR[0] : 0 = Disabled, 1 = Enabled
group-onsemi 0:098463de4c5d 51 *
group-onsemi 0:098463de4c5d 52 */
group-onsemi 0:098463de4c5d 53 int rtc_isenabled(void) {
group-onsemi 0:098463de4c5d 54 return(((LPC_RTC->CCR) & 0x01) != 0);
group-onsemi 0:098463de4c5d 55 }
group-onsemi 0:098463de4c5d 56
group-onsemi 0:098463de4c5d 57 /*
group-onsemi 0:098463de4c5d 58 * RTC Registers
group-onsemi 0:098463de4c5d 59 * RTC_SEC Seconds 0-59
group-onsemi 0:098463de4c5d 60 * RTC_MIN Minutes 0-59
group-onsemi 0:098463de4c5d 61 * RTC_HOUR Hour 0-23
group-onsemi 0:098463de4c5d 62 * RTC_DOM Day of Month 1-28..31
group-onsemi 0:098463de4c5d 63 * RTC_DOW Day of Week 0-6
group-onsemi 0:098463de4c5d 64 * RTC_DOY Day of Year 1-365
group-onsemi 0:098463de4c5d 65 * RTC_MONTH Month 1-12
group-onsemi 0:098463de4c5d 66 * RTC_YEAR Year 0-4095
group-onsemi 0:098463de4c5d 67 *
group-onsemi 0:098463de4c5d 68 * struct tm
group-onsemi 0:098463de4c5d 69 * tm_sec seconds after the minute 0-61
group-onsemi 0:098463de4c5d 70 * tm_min minutes after the hour 0-59
group-onsemi 0:098463de4c5d 71 * tm_hour hours since midnight 0-23
group-onsemi 0:098463de4c5d 72 * tm_mday day of the month 1-31
group-onsemi 0:098463de4c5d 73 * tm_mon months since January 0-11
group-onsemi 0:098463de4c5d 74 * tm_year years since 1900
group-onsemi 0:098463de4c5d 75 * tm_wday days since Sunday 0-6
group-onsemi 0:098463de4c5d 76 * tm_yday days since January 1 0-365
group-onsemi 0:098463de4c5d 77 * tm_isdst Daylight Saving Time flag
group-onsemi 0:098463de4c5d 78 */
group-onsemi 0:098463de4c5d 79 time_t rtc_read(void) {
group-onsemi 0:098463de4c5d 80 // Setup a tm structure based on the RTC
group-onsemi 0:098463de4c5d 81 struct tm timeinfo;
group-onsemi 0:098463de4c5d 82 timeinfo.tm_sec = LPC_RTC->SEC;
group-onsemi 0:098463de4c5d 83 timeinfo.tm_min = LPC_RTC->MIN;
group-onsemi 0:098463de4c5d 84 timeinfo.tm_hour = LPC_RTC->HOUR;
group-onsemi 0:098463de4c5d 85 timeinfo.tm_mday = LPC_RTC->DOM;
group-onsemi 0:098463de4c5d 86 timeinfo.tm_mon = LPC_RTC->MONTH - 1;
group-onsemi 0:098463de4c5d 87 timeinfo.tm_year = LPC_RTC->YEAR - 1900;
group-onsemi 0:098463de4c5d 88
group-onsemi 0:098463de4c5d 89 // Convert to timestamp
group-onsemi 0:098463de4c5d 90 time_t t = mktime(&timeinfo);
group-onsemi 0:098463de4c5d 91
group-onsemi 0:098463de4c5d 92 return t;
group-onsemi 0:098463de4c5d 93 }
group-onsemi 0:098463de4c5d 94
group-onsemi 0:098463de4c5d 95 void rtc_write(time_t t) {
group-onsemi 0:098463de4c5d 96 // Convert the time in to a tm
group-onsemi 0:098463de4c5d 97 struct tm *timeinfo = localtime(&t);
group-onsemi 0:098463de4c5d 98
group-onsemi 0:098463de4c5d 99 // Pause clock, and clear counter register (clears us count)
group-onsemi 0:098463de4c5d 100 LPC_RTC->CCR |= 2;
group-onsemi 0:098463de4c5d 101
group-onsemi 0:098463de4c5d 102 // Set the RTC
group-onsemi 0:098463de4c5d 103 LPC_RTC->SEC = timeinfo->tm_sec;
group-onsemi 0:098463de4c5d 104 LPC_RTC->MIN = timeinfo->tm_min;
group-onsemi 0:098463de4c5d 105 LPC_RTC->HOUR = timeinfo->tm_hour;
group-onsemi 0:098463de4c5d 106 LPC_RTC->DOM = timeinfo->tm_mday;
group-onsemi 0:098463de4c5d 107 LPC_RTC->MONTH = timeinfo->tm_mon + 1;
group-onsemi 0:098463de4c5d 108 LPC_RTC->YEAR = timeinfo->tm_year + 1900;
group-onsemi 0:098463de4c5d 109
group-onsemi 0:098463de4c5d 110 // Restart clock
group-onsemi 0:098463de4c5d 111 LPC_RTC->CCR &= ~((uint32_t)2);
group-onsemi 0:098463de4c5d 112 }