Evaluation Kit for CMX838 Family Radio Processor
6
EV8380 User Manual
9) Configure the TX MOD 1 & 2 drivers to allow for either single-point modulation or two-point
modulation.
10) Configure the TX MOD 1 or 2 drivers (or both) to invert the phase of the transmitted signal by 180° (as
desired to compensate for inverting response in either an attached VCO or VC/TCXO ).
11) Activate the external signal processing paths to allow for off-chip companding and/or scrambling.
12) Switch between RF channels for either of the FRS, GMRS, or PMR446 radio services.
13) Setup the CMX838 to transmit on one RF channel and receive on another.
14) Program the CMX838 to transmit on a RF channel other than that used in the FRS/GMRS/PMR446
radio services (i.e. generic synthesizer programming).
15) Connect the EV8380 to external circuits to allow complete radio system testing.
Tab-delimited text files are available in the “Examples” folder of the EV8380 software installation directory to
allow quick operation of the CMX838. Operations such as melody tone generation and tone cloning can be
quickly performed by the use of these tab-delimited text files. Please review Section 3.2, “CMX838
Operation”, for more information on how these text files should be used.
3.2
EV8380 Graphical User Interface (GUI)
3.2.1 General Comments
The CMX838 is controlled by writing to/reading from its internal registers over its C-BUS serial host µC
interface. Using the EV8380, CMX838 C-BUS transactions are entered in a simple WindowsTM graphical user
interface, the EV8380 GUI. The EV8380 GUI assembles C-BUS transactions from user input and causes
them to be executed between the PC and the CMX838 by way of the PCMCIA card. The C-BUS transactions
required to accomplish various CMX838 functionality can be entered in one of two ways:
1) Direct C-BUS register read and/or write operations.
2) Use of tab-delimited text files that contain a sequence of script commands with desired register
addresses and contents.
3.2.2 Starting the EV8380 GUI
Both of the above approaches involve the use of the EV8380 graphical user interface (GUI). In order to
access the GUI after the EV8380 software has been installed, select “Start > Programs > MX-Com >
EV8380”. A dialog box named “EV8380” should now appear on the screen. To access the GUI, the user
should click on the “Control” menu of the “EV8380” dialog box, and then select the “CBUS” option. The GUI
(named “C-BUS Control”) should now be on the screen.
3.2.3 EV8380 GUI Buttons and Text Boxes
The buttons and text boxes in the GUI are as follows:
1) SEND FILE: This button will allow selection of a “*.txt” script file in the PC directory where the
EV8380.exe file is located. When this file is found, the tab-delimited contents of that script file are
translated into C-BUS register commands and sent out to the CMX838 via the PCMCIA card interface.
2) C-BUS ADDRESS: This text box contains the CMX838 register address (in hex) to which a read or
write operation is about to be performed. (All of the following buttons and descriptions are referenced
to the register address stored in this text box.)
3) FIRST DATA: This text box stores the first byte of data, in hex, to be written to a CMX838 register.
4) SECOND DATA: This text box stores the second byte of data, in hex, to be written to a CMX838
register (if required).
5) FIRST READ: This text box stores the first byte of data, in hex, that was read out of a CMX838
register.
6) SECOND READ: This text box stores the second byte of data, in hex, that was read out of a CMX838
register (if required).
7) WRITE 1: This button will cause one byte (stored in C-BUS ADDRESS) to be written to a CMX838
register (i.e. ‘General Reset’ command).
8) WRITE 2: This button will cause two bytes (stored in C-BUS ADDRESS and FIRST DATA) to be
written to a CMX838 register (i.e. one address byte and one data byte).
¤2001 MX-COM, Inc.
4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA
www.mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054
Doc. # 20480230.001
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