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Tiva tm4c129dncpdt USB DFU DFU_ERR_UNKNOWN (-4)

Nick Lin1
Prodigy 10 points

Hi ,

   I have a problem, the boot_demo_usb not works properly with dfuprog.exe.

   I try to debug the dfuprog.exe, and the log listed below. It seems after changed to DFU mode, the first

  8 bytes data was sent. The return a error "device not found", any idea or suggestion ?

 Downloading 8 bytes from 0x0018fa48
State on completion IDLE, status STATUS_OK
LMDFUDeviceParamsGet 0x002f23b0
Downloading 8 bytes from 0x0018fb78
State on completion IDLE, status STATUS_OK
LMDFUDeviceIsValidImage 0x002f23b0 0x01db0068 69288
LMDFUDownloadBin 0x002f23b0 0x01db0068 69288 Don't verify
Downloading 8 bytes from 0x0018fb7c
State on completion ERROR, status STATUS_OK
Downloading 1024 bytes from 0x01db0068
Error 31 from Endpoint0Transfer

Thanks,

Nick