USB enumeration status

[chrhartz]

Hi there,

i have a PIC16F1459 permanently connected to a FE1.1S 4port usb hub
that is connected to a Raspberry CM5.

The PIC has endpoints for HID keyboard and CDC. Works fine so far.

Unfortunately i have connected the power feedback signal to the pin that
has been used in legacy devices for D+/D- and these pins are blocked if the
usb engine is activated... (PGD/Pin 16)
So i can not read the power status of the CM5. :(

Is there a chance to detect the enumeration/connection status by software?
I already tried usb_enumerated() but this did not work.

Maybe there is a bad hack to disable something to get access to the pin?
Just for a few microseconds so that nowbody notice it?

Changing the pcb is not an option, there are 70 pcbs already sent out.

Best regards,
Chris

[chrhartz]

After having a closer look to the datasheet i see two options.

There should be a start of frame interrupt (SOFIF) every 1 ms.
How does the CCS usb stack handle this interrupt?

After 3 ms without SOFIF the state machine should go to idle. (IDLEIF)
How does the CCS usb stack handle this interrupt or state?

Is there a function to read out the idle state?

Seems it is solvable in software?

Best regards,
Chris