Re: [OpenOCD-devel] How to program Kinetis with OpenOCD on windows?

[Paul F. <fer...@gm...>]

Hi Thomas :)

On Sun, Sep 03, 2017 at 04:08:58PM +0000, Thomas Varghese wrote:
> 1) With the Kinetis MK20DX256VLH7, do I need the 220-470 ohm resistor on the TDI line to use SWD?

If you want to use SWD with Olimex ARM-USB-OCD, then yes, you either
need the resistor hack or you need an Olimex SWD adapter (or similar
part from other manufacturer). 

> 2) What should the configuration file look like, here is my attempt at an openocd.cfg:
> 
> 	interface ftdi
> 	transport select swd
> 	adapter_khz 1000
> 	ftdi_vid_pid 0x15BA 0x0003
> 	ftdi_layout_init 0x0018 0x05fb
> 	ftdi_layout_signal SWD_EN -data 0
> 	ftdi_layout_signal nSRST -data 0x0010

You shouldn't be writing interface config file yourself, no. In this
case you should just source interface/ftdi/olimex-arm-usb-ocd.cfg ,
then "transport select swd", then source target config, in your case
"target/kx.cfg" should work.

> 3) Installed WinUSB driver for the Olimex ARM-USB-OCD, is this the best options?

Yes, you need to install WinUSB with Zadig, and probably you need to
install it for the whole composite device (depends on windows version
I guess).

> 4) When I try run "openocd.exe" in the directory with the
> openocd.cfg I get this:
...

I suggest you try running like this:

openocd -f interface/ftdi/olimex-arm-usb-ocd.cfg -c "transport select swd" -f target/kx.cfg

> 	Error: libusb_open() failed with LIBUSB_ERROR_NOT_SUPPORTED

This likely means WinUSB wasn't properly installed.

> 5) Based #4, where do I get libusb?  I tried changing the driver to
> libusb-win32 and libusbk, same error.  So I must be missing
> something else.

No, you should use WinUSB. libusb_open knows how to talk to it.

HTH
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