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Stellaris LM3Sxxxx UART on via ICDI not working

Other Parts Discussed in Thread: LM3S6965

Hi,

having old LM3S6965 Ethernet Eval board and EK-LM3S9B92 board.

For both I suddenly cannot communicate even with the simplest uart_echo example.

I can normally debug the application in CCS and everything else works except for the virtual Stellaris ICDI com port.

I see strange characters coming from the Stellaris ICDI com port when I debug the application.

The port seems to be correctly installed.

The strange characters come in regular intervals (about 1 second) are "DE FF FF FF FC".

Sometimes much more characters are coming.

When I debug  I receive the characters (the interrupt is triggered) but no characters are sent.

Some 4 months ago this worked fine and I made no changes with driver setup/CCS setup etc.

When I don't debug the characters are not coming but I cannot communicate via this com port either.

Can it be that the used driver FTDI driver is somewhat broken due to some recent OS update?

I use Win7x64, CCS 6.1, Stellarisware from the devkit CD, newest ICDI driver from this TI link:

  • Hello TK,

    It could be an issue with the drivers. Please check with FTDI for drivers on the new OS you have. We have had a similar issue with Win10 for ICDI drivers and it has been fixed (as ICDI is from TI).

    Can you connect a Scope probe and send one character. Then check if the character is meeting the timing for the set baud rate and format.

    Regards
    Amit