I have been using a TWR-K60 board with my J-Link debugger for a couple years now with no issue at all, also use the same J-Link with various other boards and a variety of processors. I searched the forums here, tried the various things suggested to no avail. J32 removed, reflashed with latest binary. Still nothing. It's a rev A0 board according the the box. I am using IAR workbench, and when I try to load an application into the K65, I just get "Failed to get CPU status after 4 retries." Debug log shows "Could not measure total IR len. TDO is constant high."
Hi Richard,
SWD interface doesn't use JTAG_TDO and JTAG_TDI pin while JTAG does.
the default board doesn't install R69 and R68, thus JTAG_TDO and JTAG_TDI can't work with JTAG.
Have a great day,
Jennie Zhang
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I can confirm that adding the no load R68 and R69 0 ohm resistors corrects the problem, I can now use the j-link JTAG debugger with the board.
Using the SWD interface with J32 installed works, but is not ideal by any means. I would really like to get the JTAG interface working
Oh, and I tried it with two different TWR-K65F180M boards.