add docs

documentation/ChangeLog.txt

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+* Version 1.2.0 (20100306)
+    - adopted to new build system (taken from flyer)
+
+* Version 1.1.5 (20100306)
+    - updated usart lib and sync timer
+
+* Version 1.1.4 (20091212)
+    - secured firmware command
+    - rewritten modfify command handling to support new option
+    - due to flaw in TurboEDIT's byte count in write W command
+	added flag that decides how to treat bytecount in W command
+	b_bcnt_mode = false => 0x00 means 256 bytes, 0xFF means 255 bytes
+	b_bcnt_mode = true => 0x00 means 1 byte, 0xFF means 255 bytes
+	NOTE: use b_cnt_mode = true only for TurboEDIT!
+    - set default transmission parameters to:
+	baudrate 920000, 2 stop bits, even parity
+	(defaults for CROME 1.5.3 and above) - most frequent usage
+	NOTE: due to flaw in CROME 1.5.3 and 1.5.5beta (older versions
+    	    are not affected) serial port opening methods which discards
+	    any user settings in window and uses 9600 or 920000 baudrate
+
+* Version 1.1.3 (20091207)
+    - fixed usart_const computation issue in initUsart
+
+* Version 1.1.2 (20091206)
+    - fixed error flags handling in usart module
+
+* Version 1.1.1 (20091206)
+    - added response when parameters modification failed
+
+* Version 1.1.0 (20091124)
+    - due to compatibility issues default USART frame again is:
+	baudrate 115200, 2 stop bits, no parity
+    - general code cleanup
+    - reduced clock cycles in memory handling
+    - added new command: M - modify usart settings (using this
+	allows to change usart parameters on the fly, what is
+	needed for proper work with software tools from different
+	suppliers
+    - fixed acknowledge in for write block X (bytes order)
+
+* Version 1.0.1 (20091118)
+    - changed baudrate to 920000, because of bug in CROME newer than 1.5
+
+* Version 1.0.0 (20091116)
+    - initial release