mbed library sources
Dependents: frdm_kl05z_gpio_test
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targets/hal/TARGET_NXP/TARGET_LPC408X/rtc_api.c
- Committer:
- shaoziyang
- Date:
- 2014-09-13
- Revision:
- 323:9e901b0a5aa1
- Parent:
- 15:4892fe388435
File content as of revision 323:9e901b0a5aa1:
/* mbed Microcontroller Library * Copyright (c) 2006-2013 ARM Limited * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #include "rtc_api.h" // ensure rtc is running (unchanged if already running) /* Setup the RTC based on a time structure, ensuring RTC is enabled * * Can be clocked by a 32.768KHz oscillator or prescale divider based on the APB clock * - We want to use the 32khz clock, allowing for sleep mode * * Most registers are not changed by a Reset * - We must initialize these registers between power-on and setting the RTC into operation * Clock Control Register * RTC_CCR[0] : Enable - 0 = Disabled, 1 = Enabled * RTC_CCR[1] : Reset - 0 = Normal, 1 = Reset * RTC_CCR[4] : Clock Source - 0 = Prescaler, 1 = 32k Xtal * * The RTC may already be running, so we should set it up * without impacting if it is the case */ void rtc_init(void) { LPC_SC->PCONP |= 0x200; // Ensure power is on LPC_RTC->CCR = 0x00; // clock source on 2368 is special test mode on 1768! LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled } void rtc_free(void) { // [TODO] } /* * Little check routine to see if the RTC has been enabled * * Clock Control Register * RTC_CCR[0] : 0 = Disabled, 1 = Enabled * */ int rtc_isenabled(void) { return(((LPC_RTC->CCR) & 0x01) != 0); } /* * RTC Registers * RTC_SEC Seconds 0-59 * RTC_MIN Minutes 0-59 * RTC_HOUR Hour 0-23 * RTC_DOM Day of Month 1-28..31 * RTC_DOW Day of Week 0-6 * RTC_DOY Day of Year 1-365 * RTC_MONTH Month 1-12 * RTC_YEAR Year 0-4095 * * struct tm * tm_sec seconds after the minute 0-61 * tm_min minutes after the hour 0-59 * tm_hour hours since midnight 0-23 * tm_mday day of the month 1-31 * tm_mon months since January 0-11 * tm_year years since 1900 * tm_wday days since Sunday 0-6 * tm_yday days since January 1 0-365 * tm_isdst Daylight Saving Time flag */ time_t rtc_read(void) { // Setup a tm structure based on the RTC struct tm timeinfo; timeinfo.tm_sec = LPC_RTC->SEC; timeinfo.tm_min = LPC_RTC->MIN; timeinfo.tm_hour = LPC_RTC->HOUR; timeinfo.tm_mday = LPC_RTC->DOM; timeinfo.tm_mon = LPC_RTC->MONTH - 1; timeinfo.tm_year = LPC_RTC->YEAR - 1900; // Convert to timestamp time_t t = mktime(&timeinfo); return t; } void rtc_write(time_t t) { // Convert the time in to a tm struct tm *timeinfo = localtime(&t); // Pause clock, and clear counter register (clears us count) LPC_RTC->CCR |= 2; // Set the RTC LPC_RTC->SEC = timeinfo->tm_sec; LPC_RTC->MIN = timeinfo->tm_min; LPC_RTC->HOUR = timeinfo->tm_hour; LPC_RTC->DOM = timeinfo->tm_mday; LPC_RTC->MONTH = timeinfo->tm_mon + 1; LPC_RTC->YEAR = timeinfo->tm_year + 1900; // Restart clock LPC_RTC->CCR &= ~((uint32_t)2); }