User`s guide

Gyro Control Unit (GCU)

User’s Guide

MaxMetrix, Scottsdale, AZ

PN: GCU-2K1-UG:RevI.2 NGC

4.1.6.3 NO-OP

The NO-OP (no operation) command button tests the communications link with the microcontroller on the

GCU. If the link is valid a message is displayed indicating the link PASSED. If the application is unable

to establish communications with the GCU unit the message displays FAILED.

4.1.6.4 DSP ENTRY POINT

The DSP Entry Point Text Box sets the starting address for the DSP Code. “AUTO” automatically finds

the address in the object code file. The User can specify this address manually if desired.

4.1.6.5 AUTOBOOT ENABLE

The Auto-boot enable checkbox allows the user to disable/enable the microcontroller autoboot function.

During normal operation, if the microcontroller does not get a good status reply from the DSP it will try

and reboot the DSP from FLASH continuously. During Debug the autoboot function conflicts with the

DSP in-circuit emulator. Disabling the autoboot enable function (by unchecking autoboot) disables the

microcontroller from rebooting the DSP, allowing the debug session to resume normally. The autoboot

function should be enabled for normal operation.

4.1.6.6 FIRMWARE RELEASE LEVEL

The firmware revision numbers can be determined using the Status Report selection radio button located on

the Cal/Status Tab. The current revision information is reported back to the GUI for inspection.

4.1.6.7 TROUBLESHOOTING THE LINK

There are several reasons for the communications link to report a “FAILED” message, some of the most

common are provided below:

• Power not applied to the GCU unit, power must be applied to download a GCU module.

• Wrong serial port selected. The USB is used as a virtual serial communication port. Make sure

the correct port is selected in the PORTS pull down menu.

• Wrong USB cable type or cable not connected

The user should always test the communications link by selecting the NO-OP command button and

getting a PASSED message before trying to download the GCU with new firmware.