Moved board-related stuff in board subdirectory

board/libs/library/datasheet/BM20/README.md

@@ -0,0 +1,36 @@
+# documents
+
+BM20 module documents: https://www.microchip.com/wwwproducts/en/BM20
+
+BM20 evaluation board documents (Schematics): https://www.microchip.com/DevelopmentTools/ProductDetails/PartNO/BM-20-EVB
+
+AVRCP 1.5 specification: https://www.bluetooth.com/specifications/profiles-overview/
+
+Spreadsheet with serial commands and events is located inside http://ww1.microchip.com/downloads/en/DeviceDoc/IS2020_203_Tools.zip -> UART_tool -> UART_CommandSet_v147_20140520.xlsx
+
+AT commnads for accesing phonebook (for example) are described in UIS2020_203_Tools.zip -> ART_tool/ETS_AT_CMD.pdf
+
+After removind SimpleIO-UM.dll inside UART_tool directory, serial example tool '5502UARTCommandSetTool v001.000.exe' can by used with any usb to serial converter.
+
+
+# arduino library
+
+https://github.com/tomaskovacik/IS2020
+
+# my eeprom setting 
+
+BM20.ipf file contains eeprom patch with settings:
+
+- HFP/HSP profile
+- A2DP profile 
+- AVRCP controler and target profile
+- SPP profile
+- now buttons
+- line in (P3_0 detection)
+- power on directly
+- serial interface at 115200b
+- simple pairing enabled
+.... 
+
+load it with ui tool to see
+