topic Re: USB interrupt reset in Kinetis Microcontrollers

USB interrupt reset

joeygouly — Sun, 08 Mar 2015 14:36:56 GMT

Hi all,

I recently got a FRDM-MKL26Z dev board and I'm having trouble getting USB up and running.

I took some code from the Teensy repository ( cores/teensy3 at master · PaulStoffregen/cores · GitHub ) and the USB code from this project ( kcuzner/teensy-oscilloscope · GitHub )

However, when I compile and flash the board the only USB interrupt that fires are 'reset' and 'sleep'.

I was wondering if someone could look at my code, and see if anything looks wrong.

I guess the main points of interest would be the following:

init_clocks_ref() : frdm-mkl26z/mkl26z64.c at master · jgouly/frdm-mkl26z · GitHub

usb_init() : frdm-mkl26z/usb.c at master · jgouly/frdm-mkl26z · GitHub

USBOTG_IRQHandler() : frdm-mkl26z/usb.c at master · jgouly/frdm-mkl26z · GitHub

Any help or guidance would be great, and if you need more information, let me know!

Thanks,

Joey

Note:

This question seems similar to USB k20_100: no TOKENDNE interrupt. Please help. but it was never resolved.

Re: USB interrupt reset

mjbcswitzerland — Sun, 08 Mar 2015 18:02:10 GMT

Hi Joey

You can take a look at http://www.utasker.com/kinetis/FRDM-KL26Z.html

This contains USB composite device support for the FRDM-KL26Z (single or multiple CDC plus MSD and HID), also works with the Teensy 3.1 µTasker Kinetis support and is prepared for the Teensy LC µTasker Kinetis Teensy LC support

If you have only USB status change interrupts it is probably a clocking problem but the above code will work out of the box and should give you a lot more features and is industrially proven. You can also work with (free Express edition) VisualStudio and simulate the boards in (approx.) real-time. Completely free for non-commercial use and supported in this forum.

Regards

Mark

Kinetis: µTasker Kinetis support

K20: µTasker Kinetis TWR-K20D72M support / µTasker Kinetis FRDM-K20D50M support / µTasker Kinetis TWR-K20D50M support / µTasker Kinetis support

KL26: µTasker Kinetis FRDM-KL26Z support / µTasker Kinetis Teensy LC support

Composite USB: µTasker USB Device Configuration

USB User's Guide: http://www.utasker.com/docs/uTasker/USB_User_Guide.PDF

For the complete "out-of-the-box" Kinetis experience and faster time to market

Re: USB interrupt reset

joeygouly — Sun, 08 Mar 2015 21:40:01 GMT

Hi Mark,

Thanks for the links!

Would you be able to point to some useful parts of the code, such as USB handling, setting the clocks etc?

I would prefer to get the code I have working, since I may end up trying to port existing code that is very similar, or uses the Teensy code.

Thanks!

Joey

Re: USB interrupt reset

mjbcswitzerland — Sun, 08 Mar 2015 22:42:59 GMT

Hi Joey

If you load the reference binary in the link you can compare clock registers with those that you have (using the debugger) and possibly find a difference that explains a problem.

Otherwise it may be best to ask for help at the Teensy forum if your code needs to be based on it: https://forum.pjrc.com/forum.php

Note that the Teensy LC's KL26 is not identical to the FRDM-KL26's since it is a cut-down version of it.

Regards

Mark

Kinetis: µTasker Kinetis support

K20: µTasker Kinetis TWR-K20D72M support / µTasker Kinetis FRDM-K20D50M support / µTasker Kinetis TWR-K20D50M support / µTasker Kinetis support

KL26: µTasker Kinetis FRDM-KL26Z support / µTasker Kinetis Teensy LC support

Composite USB: µTasker USB Device Configuration

USB User's Guide: http://www.utasker.com/docs/uTasker/USB_User_Guide.PDF

For the complete "out-of-the-box" Kinetis experience and faster time to market

Re: USB interrupt reset

joeygouly — Thu, 12 Mar 2015 20:38:47 GMT

Any other help?

Thanks,

Joey

Re: USB interrupt reset

mjbcswitzerland — Thu, 12 Mar 2015 22:23:27 GMT

Hi Joy

Did the comparison with the register settings allow you to close in on a particluar area to look into in more details to solve the issue?

Did you get any feedback at the original developers' web sites?

Regards

Mark

Kinetis: µTasker Kinetis support

K20: µTasker Kinetis TWR-K20D72M support / µTasker Kinetis FRDM-K20D50M support / µTasker Kinetis TWR-K20D50M support / µTasker Kinetis support

KL26: µTasker Kinetis FRDM-KL26Z support / µTasker Kinetis Teensy LC support

Composite USB: µTasker USB Device Configuration

USB User's Guide: http://www.utasker.com/docs/uTasker/USB_User_Guide.PDF

For the complete "out-of-the-box" Kinetis experience and faster time to market

Re: USB interrupt reset

joeygouly — Thu, 12 Mar 2015 22:56:37 GMT

Hi Mark,

I've been busy and haven't had any time to ask on the PJRC forums, I was just bumping the thread here to see if I could get any other help!

The weekend is closing in, then I'll have time to get my hands dirty!

Thanks,

Joey

Re: USB interrupt reset

joeygouly — Tue, 17 Mar 2015 18:39:59 GMT

I used the Teensy USB code (rather than the external USB code I was trying before) and managed to get this working!

Thanks!