created separate function for hex to char

Dependencies:   SDFileSystem ds3231 eeprom_Nikita mbed testUniGraphic_150217

Fork of SS_SensePOC2P0_11Dec2017_USERPID by rashmi v

Revision:
1:8316c23ec6b9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/rtc.h	Mon Jan 30 07:45:41 2017 +0000
@@ -0,0 +1,6 @@
+#ifndef RTC_H_
+#define RTC_H_
+
+time_t rtc_read();
+
+#endif 
\ No newline at end of file