Tiva USB bootloader and new Driverlib 2.1.3.156

Maxime GUYON

Hello,

I experienced an issue updating to new driverlib 2.1.3.156 and using ROM based USB booltader.
With the new driverlib, USB seem to fail to initialize when I launch Bootloader with following function :

ROM_UpdateUSB(0);

Everything worked like a charm with previous driverlib version 2.1.2.111.
I noticed that in the new driverlib, change was made to the file "sysctl.c" : "Incorrect Programming in SysCtlClockFreqSet API in Sysctl Driver"
More precisely the issue seem to be in function:

SysCtlClockFreqSet

So I tested to only revert "sysctl.c" with the old one from 2.1.2.111 and surprise USB update is now working again.

I suspect that something need to be done before launching USB bootloader, maybe the PLL is not configured as desired for USB bootloader.

Regards,

Max

over 8 years ago

0 Amit Ashara over 8 years ago

TI__Guru**** 244400 points

Hello Maxime,

Please refer to the example

D:\ti\TivaWare_C_Series-2.1.3.156\examples\boards\dk-tm4c129x\boot_demo_usb

which shows how to use ROM_UpdateUSB(0) after the changes made to the sysctl.c

0 Maxime GUYON over 8 years ago in reply to Amit Ashara

Expert 1035 points

Hello,

Thank you,

It work now, I missed the "little" change in function "ROM_USBClockEnable":

Old driverlib:

ROM_USBClockEnable(USB0_BASE, 8, USB_CLOCK_INTERNAL);

New driverlib:

ROM_USBClockEnable(USB0_BASE, 4, USB_CLOCK_INTERNAL);

I think that an advice for this change, (maybe in release note) is needed, because it prevent
legacy project to work correctly without be aware of the change made.

Regards

0 Amit Ashara over 8 years ago in reply to Maxime GUYON

TI__Guru**** 244400 points

Hello Maxime,

Sure. This change was being handled by the Set Feature function API from the USBLib. So it was easy to miss this.

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Tiva USB bootloader and new Driverlib 2.1.3.156