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targets/TARGET_NXP/TARGET_LPC23XX/rtc_api.c@178:c26431f84b0d, 2017-11-09 (annotated)
- Committer:
- amithy
- Date:
- Thu Nov 09 22:14:37 2017 +0000
- Revision:
- 178:c26431f84b0d
- Parent:
- 149:156823d33999
test export
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
<> | 144:ef7eb2e8f9f7 | 1 | /* mbed Microcontroller Library |
<> | 144:ef7eb2e8f9f7 | 2 | * Copyright (c) 2006-2013 ARM Limited |
<> | 144:ef7eb2e8f9f7 | 3 | * |
<> | 144:ef7eb2e8f9f7 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
<> | 144:ef7eb2e8f9f7 | 5 | * you may not use this file except in compliance with the License. |
<> | 144:ef7eb2e8f9f7 | 6 | * You may obtain a copy of the License at |
<> | 144:ef7eb2e8f9f7 | 7 | * |
<> | 144:ef7eb2e8f9f7 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
<> | 144:ef7eb2e8f9f7 | 9 | * |
<> | 144:ef7eb2e8f9f7 | 10 | * Unless required by applicable law or agreed to in writing, software |
<> | 144:ef7eb2e8f9f7 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
<> | 144:ef7eb2e8f9f7 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
<> | 144:ef7eb2e8f9f7 | 13 | * See the License for the specific language governing permissions and |
<> | 144:ef7eb2e8f9f7 | 14 | * limitations under the License. |
<> | 144:ef7eb2e8f9f7 | 15 | */ |
<> | 144:ef7eb2e8f9f7 | 16 | #include "rtc_api.h" |
<> | 144:ef7eb2e8f9f7 | 17 | |
<> | 144:ef7eb2e8f9f7 | 18 | // ensure rtc is running (unchanged if already running) |
<> | 144:ef7eb2e8f9f7 | 19 | |
<> | 144:ef7eb2e8f9f7 | 20 | /* Setup the RTC based on a time structure, ensuring RTC is enabled |
<> | 144:ef7eb2e8f9f7 | 21 | * |
<> | 144:ef7eb2e8f9f7 | 22 | * Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock |
<> | 144:ef7eb2e8f9f7 | 23 | * - We want to use the 32khz clock, allowing for sleep mode |
<> | 144:ef7eb2e8f9f7 | 24 | * |
<> | 144:ef7eb2e8f9f7 | 25 | * Most registers are not changed by a Reset |
<> | 144:ef7eb2e8f9f7 | 26 | * - We must initialize these registers between power-on and setting the RTC into operation |
<> | 144:ef7eb2e8f9f7 | 27 | |
<> | 144:ef7eb2e8f9f7 | 28 | * Clock Control Register |
<> | 144:ef7eb2e8f9f7 | 29 | * RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled |
<> | 144:ef7eb2e8f9f7 | 30 | * RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset |
<> | 144:ef7eb2e8f9f7 | 31 | * RTC_CCR[4] : Clock Source - 0 = Prescaler, 1 = 32k Xtal |
<> | 144:ef7eb2e8f9f7 | 32 | * |
<> | 144:ef7eb2e8f9f7 | 33 | * The RTC may already be running, so we should set it up |
<> | 144:ef7eb2e8f9f7 | 34 | * without impacting if it is the case |
<> | 144:ef7eb2e8f9f7 | 35 | */ |
<> | 144:ef7eb2e8f9f7 | 36 | void rtc_init(void) { |
<> | 144:ef7eb2e8f9f7 | 37 | LPC_SC->PCONP |= 0x200; // Ensure power is on |
<> | 144:ef7eb2e8f9f7 | 38 | LPC_RTC->CCR = 0x00; |
<> | 144:ef7eb2e8f9f7 | 39 | |
<> | 144:ef7eb2e8f9f7 | 40 | // clock source on 2368 is special test mode on 1768! |
<> | 144:ef7eb2e8f9f7 | 41 | LPC_RTC->CCR |= 1 << 4; // Ensure clock source is 32KHz Xtal |
<> | 144:ef7eb2e8f9f7 | 42 | |
<> | 144:ef7eb2e8f9f7 | 43 | LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled |
<> | 144:ef7eb2e8f9f7 | 44 | } |
<> | 144:ef7eb2e8f9f7 | 45 | |
<> | 144:ef7eb2e8f9f7 | 46 | void rtc_free(void) { |
<> | 144:ef7eb2e8f9f7 | 47 | // [TODO] |
<> | 144:ef7eb2e8f9f7 | 48 | } |
<> | 144:ef7eb2e8f9f7 | 49 | |
<> | 144:ef7eb2e8f9f7 | 50 | /* |
<> | 144:ef7eb2e8f9f7 | 51 | * Little check routine to see if the RTC has been enabled |
<> | 144:ef7eb2e8f9f7 | 52 | * |
<> | 144:ef7eb2e8f9f7 | 53 | * Clock Control Register |
<> | 144:ef7eb2e8f9f7 | 54 | * RTC_CCR[0] : 0 = Disabled, 1 = Enabled |
<> | 144:ef7eb2e8f9f7 | 55 | * |
<> | 144:ef7eb2e8f9f7 | 56 | */ |
<> | 144:ef7eb2e8f9f7 | 57 | |
<> | 144:ef7eb2e8f9f7 | 58 | int rtc_isenabled(void) { |
<> | 144:ef7eb2e8f9f7 | 59 | return(((LPC_RTC->CCR) & 0x01) != 0); |
<> | 144:ef7eb2e8f9f7 | 60 | } |
<> | 144:ef7eb2e8f9f7 | 61 | |
<> | 144:ef7eb2e8f9f7 | 62 | /* |
<> | 144:ef7eb2e8f9f7 | 63 | * RTC Registers |
<> | 144:ef7eb2e8f9f7 | 64 | * RTC_SEC Seconds 0-59 |
<> | 144:ef7eb2e8f9f7 | 65 | * RTC_MIN Minutes 0-59 |
<> | 144:ef7eb2e8f9f7 | 66 | * RTC_HOUR Hour 0-23 |
<> | 144:ef7eb2e8f9f7 | 67 | * RTC_DOM Day of Month 1-28..31 |
<> | 144:ef7eb2e8f9f7 | 68 | * RTC_DOW Day of Week 0-6 |
<> | 144:ef7eb2e8f9f7 | 69 | * RTC_DOY Day of Year 1-365 |
<> | 144:ef7eb2e8f9f7 | 70 | * RTC_MONTH Month 1-12 |
<> | 144:ef7eb2e8f9f7 | 71 | * RTC_YEAR Year 0-4095 |
<> | 144:ef7eb2e8f9f7 | 72 | * |
<> | 144:ef7eb2e8f9f7 | 73 | * struct tm |
<> | 144:ef7eb2e8f9f7 | 74 | * tm_sec seconds after the minute 0-61 |
<> | 144:ef7eb2e8f9f7 | 75 | * tm_min minutes after the hour 0-59 |
<> | 144:ef7eb2e8f9f7 | 76 | * tm_hour hours since midnight 0-23 |
<> | 144:ef7eb2e8f9f7 | 77 | * tm_mday day of the month 1-31 |
<> | 144:ef7eb2e8f9f7 | 78 | * tm_mon months since January 0-11 |
<> | 144:ef7eb2e8f9f7 | 79 | * tm_year years since 1900 |
<> | 144:ef7eb2e8f9f7 | 80 | * tm_wday days since Sunday 0-6 |
<> | 144:ef7eb2e8f9f7 | 81 | * tm_yday days since January 1 0-365 |
<> | 144:ef7eb2e8f9f7 | 82 | * tm_isdst Daylight Saving Time flag |
<> | 144:ef7eb2e8f9f7 | 83 | */ |
<> | 144:ef7eb2e8f9f7 | 84 | time_t rtc_read(void) { |
<> | 144:ef7eb2e8f9f7 | 85 | // Setup a tm structure based on the RTC |
<> | 144:ef7eb2e8f9f7 | 86 | struct tm timeinfo; |
<> | 144:ef7eb2e8f9f7 | 87 | timeinfo.tm_sec = LPC_RTC->SEC; |
<> | 144:ef7eb2e8f9f7 | 88 | timeinfo.tm_min = LPC_RTC->MIN; |
<> | 144:ef7eb2e8f9f7 | 89 | timeinfo.tm_hour = LPC_RTC->HOUR; |
<> | 144:ef7eb2e8f9f7 | 90 | timeinfo.tm_mday = LPC_RTC->DOM; |
<> | 144:ef7eb2e8f9f7 | 91 | timeinfo.tm_mon = LPC_RTC->MONTH - 1; |
<> | 144:ef7eb2e8f9f7 | 92 | timeinfo.tm_year = LPC_RTC->YEAR - 1900; |
<> | 144:ef7eb2e8f9f7 | 93 | |
<> | 144:ef7eb2e8f9f7 | 94 | // Convert to timestamp |
<> | 144:ef7eb2e8f9f7 | 95 | time_t t = mktime(&timeinfo); |
<> | 144:ef7eb2e8f9f7 | 96 | |
<> | 144:ef7eb2e8f9f7 | 97 | return t; |
<> | 144:ef7eb2e8f9f7 | 98 | } |
<> | 144:ef7eb2e8f9f7 | 99 | |
<> | 144:ef7eb2e8f9f7 | 100 | void rtc_write(time_t t) { |
<> | 144:ef7eb2e8f9f7 | 101 | // Convert the time in to a tm |
<> | 144:ef7eb2e8f9f7 | 102 | struct tm *timeinfo = localtime(&t); |
<> | 144:ef7eb2e8f9f7 | 103 | |
<> | 144:ef7eb2e8f9f7 | 104 | // Pause clock, and clear counter register (clears us count) |
<> | 144:ef7eb2e8f9f7 | 105 | LPC_RTC->CCR |= 2; |
<> | 144:ef7eb2e8f9f7 | 106 | |
<> | 144:ef7eb2e8f9f7 | 107 | // Set the RTC |
<> | 144:ef7eb2e8f9f7 | 108 | LPC_RTC->SEC = timeinfo->tm_sec; |
<> | 144:ef7eb2e8f9f7 | 109 | LPC_RTC->MIN = timeinfo->tm_min; |
<> | 144:ef7eb2e8f9f7 | 110 | LPC_RTC->HOUR = timeinfo->tm_hour; |
<> | 144:ef7eb2e8f9f7 | 111 | LPC_RTC->DOM = timeinfo->tm_mday; |
<> | 144:ef7eb2e8f9f7 | 112 | LPC_RTC->MONTH = timeinfo->tm_mon + 1; |
<> | 144:ef7eb2e8f9f7 | 113 | LPC_RTC->YEAR = timeinfo->tm_year + 1900; |
<> | 144:ef7eb2e8f9f7 | 114 | |
<> | 144:ef7eb2e8f9f7 | 115 | // Restart clock |
<> | 144:ef7eb2e8f9f7 | 116 | LPC_RTC->CCR &= ~((uint32_t)2); |
<> | 144:ef7eb2e8f9f7 | 117 | } |