USB enumeration failure with Tivaware 2.1.3.156.

Inbae Choi

Hello,

I have worked some USB host audio functionalties with Tivaware 2.1.2.111, and it's been working quite well.
But, the same program was not working with Tivaware 2.1.3.156, so debugged and found that the USB device enumeration was in endless loop because the USBHCDGetDeviceDescriptor() in usbhostenum.c does not return the correct value, but I stuck here because there's no differences in USB library code between 2.1.2.111 and 2.1.3.156.

So, can you please help me why the USBHCDGetDeviceDescriptor() returns bad values in Tivaware 2.1.3.156?, I made very simple application for this issue, and if you change the project into Tivaware 2.1.2.111, then you can see the USB device enumeration is successful.

Thanks & B. Regards,
Inbae

7028.usb_host_audio_in_for_1294xl.zip

over 8 years ago

0 Amit Ashara over 8 years ago

TI__Guru**** 244400 points

Hello Inbae

In TivaWare 2.1.3.156 a change was made for the two errata's. Because of this the effective VCO has changed. To compensate for the same a new API has been added called SysCtlVCOGet. Make the following change in your main code

ui32PLLRate = SysCtlVCOGet;

0 Inbae Choi over 8 years ago in reply to Amit Ashara

Prodigy 240 points

Hello Amit,

Thanks so much for the quick response, it's working well with your comments..

Thanks & B. Regards,
Inbae

0 Amit Ashara over 8 years ago in reply to Inbae Choi

TI__Guru**** 244400 points

Hello Inbae

Also do note that unlike the previous release, the System Clock of 120 and 60MHz now support USB operations

Arm-based microcontrollers

Arm-based microcontrollers forum

USB enumeration failure with Tivaware 2.1.3.156.