Diff: dm_rtc.cpp

Revision:

42:bbfe299d4a0c

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/dm_rtc.cpp	Mon Nov 04 14:32:50 2019 +0000
@@ -0,0 +1,103 @@
+/*
+ *  Copyright 2019 Embedded Artists AB
+ *
+ *  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.
+ */
+ 
+
+/******************************************************************************
+ * Includes
+ *****************************************************************************/
+
+#include "mbed.h"
+#include "dm_rtc.h"
+#include "mbed_mktime.h"
+
+/******************************************************************************
+ * Defines and typedefs
+ *****************************************************************************/
+ 
+/******************************************************************************
+ * External global variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Local variables
+ *****************************************************************************/
+
+/******************************************************************************
+ * Local Functions
+ *****************************************************************************/
+
+
+/******************************************************************************
+ * Public Functions
+ *****************************************************************************/ 
+ 
+void dm_init_rtc(void)
+{
+    LPC_SC->PCONP |= 0x200; // Ensure power is on
+    LPC_RTC->CCR = 0x00;
+    
+    LPC_RTC->CCR |= 1 << 0; // Ensure the RTC is enabled    
+}
+
+time_t dm_read_rtc(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;
+    if (_rtc_maketime(&timeinfo, &t, RTC_4_YEAR_LEAP_YEAR_SUPPORT) == false) {
+        return 0;
+    }
+    
+    return t;    
+}
+
+void dm_write_rtc(time_t t)
+{
+    // Convert the time in to a tm
+    struct tm timeinfo;
+    if (_rtc_localtime(t, &timeinfo, RTC_4_YEAR_LEAP_YEAR_SUPPORT) == false) {
+        return;
+    }
+
+    // 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);    
+}
+
+int dm_isenabled_rtc(void)
+{
+    return(((LPC_RTC->CCR) & 0x01) != 0);
+}
+
+ 
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