No access to USB register (USBSS, USB0, ...)

Stefan Beck

Hello,

we are using the TI AM335x Starterkit and modified it for debugging with JTAG.

Download und debugging with IAR Workbench via I-Jet is possible.

After downloading, our application works. But we don't have access to the registers in the range from 0x4740000 to 0x47FFFFFF.

For example a read access to USBSS.REVREG leads to an exception. In this address range the memory window of the IAR Workbench shows dashes only.

The register at CM_PER and PRM_PER are set to the values:

PM_PER_RSTCTRL = 0x00000003
PM_PER_PWRSTST = 0x1E60007
PM_PER_PWRSTCTRL = 0xEE0000EB

CM_PER_L3S_CLKSTCTRL = 0x000A
CM_PER_L3_CLKSTCTRL = 0x001E

Is there a register, I forgot to initialize?

What must I do, to have access to the USB register (USBSS, USB0, ...)?

King regards,

Stefan

over 12 years ago

0 J Burke over 12 years ago

Intellectual 350 points

Sorry I don't have any ideas on this particular issue, but can you possibly tell me how you where able to get IAR Workbench via I-Jet to work together? (You mentioned the same issue I'm having here: http://e2e.ti.com/support/embedded/starterware/f/790/t/256126.aspx)

0 Adeneo Embedded support team over 12 years ago

Mastermind 9310 points

Hi Stefan,

It might be worth while to look at the Linux BSP to see how the clock tree is initialized and use that as a reference. You could also dump the registers from Linux and use those value to confirm your current settings.

Regards,

0 Stefan Beck over 12 years ago in reply to Adeneo Embedded support team

Prodigy 50 points

Hi,

the problem was, that the CM_PER_USB0_CLKCTRL wasn't active.

Regard

Stefan

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No access to USB register (USBSS, USB0, ...)