USB_HID_CDC Problem [Solved]

kmp84 · Joined: 02 Feb 2010 Posts: 350

Hello,

I have strange problem with my last project. USB hid bootloader and CCS usb virtual comport. Bootloader work good, but after reboot and go to application for some usb ports and some PC usb cdc can't be enumerated and stay as hid input device in windows task manager.

Any suggestion?

Target: 18F24K50
CCS C ver.5.075

Best Wishes!

temtronic · Posted: Thu Oct 31, 2019 5:22 am

What's running on the PC ? Is it 100% dedicated to ONLY PIC development or used for 'everything', like internet, emails, games, eng pgms, etc. ?
If not dedicated, what 'autoupdate' programs are enabled ? Is it on a network ? What OS ? Wireless capable ? Only one USB port or more ?

I had a similar problem, nasty, as 'it worked minutes ago', now it doesn't. I never did find the culprit but some program or 'ap' had modified the parameters of the USB port I'd been using for months. Arrgh.

My 'PIC PC' is NOT connected to anything and only has PIC related programs on it. Also ALL 'autoupdate' options are disabled even though the PC cannot access the Internet.

Might not be your problem, but 'gremlins' are out there !

E_Blue · Joined: 13 Apr 2011 Posts: 417

Did you make any change to the clock setup when the main programs runs?

The device is dual powered or just USB powered?

Are you using USB_SENSE_PIN?

Are you calling usb_task() continuously in periods less than 10mS?
_________________
Electric Blue

temtronic · Posted: Thu Oct 31, 2019 6:38 am

this description...

kmp84 · Joined: 02 Feb 2010 Posts: 350

Hi mr "temtronic,

There is no programs. Just watching in windows 7,10 device manager.

kmp84 · Joined: 02 Feb 2010 Posts: 350

temtronic · Posted: Thu Oct 31, 2019 7:03 am

Is this PC connected to the Internet ?

Open USBView and compare the parameters of a working USB port versus a non working USB port.

If they are different, then some program has changed something for the nonworking USB port.

Can you confirm it DOES work on some USBports or does it NOT work for ANY USB port ?

Depending on PC and OS, USB 3.0 ports will not work as USB2.0 or USB1.0,1.1... yet another 'not backward compatible' issue.

Jay

kmp84 · Joined: 02 Feb 2010 Posts: 350

Hello all,

The problem is Solved! It was hardware problem! 4k7 res. connected between D+ and VUSB pins.

Sorry for my wrong and thanks for attention!

Best Wishes!

E_Blue · Joined: 13 Apr 2011 Posts: 417

Nice to know you got solved!

temtronic · Posted: Fri Nov 01, 2019 8:51 am

I read that the 'loader' and 'program' worked on 'some' USB ports but not all, which led me to conclude BOTH the bootloader AND application program did work. Based on that it seemed reasonable to think whatever USB ports the program doesn't work with, had 'issues'. There are differences both hard and soft between the various USB ports. I KNOW that a USB 3.0 flashdrive does NOT like to connect to a USB2.0 port on this PC (Win7). My quick, easy solution was to buy a USB2.0 flashdrive...works 100%...
Seems there was a hard issue, the 4k7 pullup....and at least he's 'up and running' !

Jay