Starterware/TM4C1294NCPDT: usb dfu not working

sateesh gorumuchu

Part Number: TM4C1294NCPDT
Other Parts Discussed in Thread: UNIFLASH

Tool/software: Starterware

Hi,

I am using TM4C1294NCPDT microcontroller, i am trying to program the chip using USB DFU mode and LM Flash programmer.

I had erased the chip using JTAG and uniflash tool. we are using 25MHZ crystal in custom board and RBIAS resistor placed in 4.87k with 1% tolerance.

When i connected the usb and checked in device manager but it shows Unknown device. Please see the below figure.

Please suggest.

Thanks

Regards,

Sateesh.

over 8 years ago

0 Lalindra Jayatilleke over 8 years ago

TI__Mastermind 30365 points

Moving this thread to the TM4c forum.

0 Charles Tsai over 8 years ago

TI__Guru**** 191296 points

Sateesh,
In your other post, you mentioned your evaluation board was working in USB DFU mode. You were able to program new code in DFU mode if the device was first erased. This means the driver is working. With your new custom board, I think it has something to do with your hardware. I will suggest you compare your schematic with the evaluation board again to see if you can spot any difference. With your custom board, can you even load any TivaWare USB examples? First make sure the USB is working.

0 sateesh gorumuchu over 8 years ago in reply to Charles Tsai

Prodigy 210 points

thanks to all.

usb dfu is working.

Regards,

Sateesh

0 Charles Tsai over 8 years ago in reply to sateesh gorumuchu

TI__Guru**** 191296 points

Hi Sateesh,
Glad your problem is solved. Can you share with us how the problem was resolved so the community may benefit next time with the similar problem?

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Arm-based microcontrollers forum

Starterware/TM4C1294NCPDT: usb dfu not working