dm_rtc.cpp

00001 /*
00002  *  Copyright 2019 Embedded Artists AB
00003  *
00004  *  Licensed under the Apache License, Version 2.0 (the "License");
00005  *  you may not use this file except in compliance with the License.
00006  *  You may obtain a copy of the License at
00007  *
00008  *    http://www.apache.org/licenses/LICENSE-2.0
00009  *
00010  *  Unless required by applicable law or agreed to in writing, software
00011  *  distributed under the License is distributed on an "AS IS" BASIS,
00012  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
00013  *  See the License for the specific language governing permissions and
00014  *  limitations under the License.
00015  */
00016  
00017 
00018 /******************************************************************************
00019  * Includes
00020  *****************************************************************************/
00021 
00022 #include "mbed.h"
00023 #include "dm_rtc.h"
00024 #include "mbed_mktime.h"
00025 
00026 /******************************************************************************
00027  * Defines and typedefs
00028  *****************************************************************************/
00029  
00030 /******************************************************************************
00031  * External global variables
00032  *****************************************************************************/
00033 
00034 /******************************************************************************
00035  * Local variables
00036  *****************************************************************************/
00037 
00038 /******************************************************************************
00039  * Local Functions
00040  *****************************************************************************/
00041 
00042 
00043 /******************************************************************************
00044  * Public Functions
00045  *****************************************************************************/ 
00046  
00047 void dm_init_rtc(void)
00048 {
00049     LPC_SC->PCONP |= 0x200; // Ensure power is on
00050     LPC_RTC->CCR = 0x00;
00051     
00052     LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled    
00053 }
00054 
00055 time_t dm_read_rtc(void)
00056 {
00057     // Setup a tm structure based on the RTC
00058     struct tm timeinfo;
00059     timeinfo.tm_sec = LPC_RTC->SEC;
00060     timeinfo.tm_min = LPC_RTC->MIN;
00061     timeinfo.tm_hour = LPC_RTC->HOUR;
00062     timeinfo.tm_mday = LPC_RTC->DOM;
00063     timeinfo.tm_mon = LPC_RTC->MONTH - 1;
00064     timeinfo.tm_year = LPC_RTC->YEAR - 1900;
00065     
00066     // Convert to timestamp
00067     time_t t;
00068     if (_rtc_maketime(&timeinfo, &t, RTC_4_YEAR_LEAP_YEAR_SUPPORT) == false) {
00069         return 0;
00070     }
00071     
00072     return t;    
00073 }
00074 
00075 void dm_write_rtc(time_t t)
00076 {
00077     // Convert the time in to a tm
00078     struct tm timeinfo;
00079     if (_rtc_localtime(t, &timeinfo, RTC_4_YEAR_LEAP_YEAR_SUPPORT) == false) {
00080         return;
00081     }
00082 
00083     // Pause clock, and clear counter register (clears us count)
00084     LPC_RTC->CCR |= 2;
00085     
00086     // Set the RTC
00087     LPC_RTC->SEC = timeinfo.tm_sec;
00088     LPC_RTC->MIN = timeinfo.tm_min;
00089     LPC_RTC->HOUR = timeinfo.tm_hour;
00090     LPC_RTC->DOM = timeinfo.tm_mday;
00091     LPC_RTC->MONTH = timeinfo.tm_mon + 1;
00092     LPC_RTC->YEAR = timeinfo.tm_year + 1900;
00093     
00094     // Restart clock
00095     LPC_RTC->CCR &= ~((uint32_t)2);    
00096 }
00097 
00098 int dm_isenabled_rtc(void)
00099 {
00100     return(((LPC_RTC->CCR) & 0x01) != 0);
00101 }
00102 
00103