On Sat, 24 Feb 2018 00:52:44 +0100
Tomas Vanek via OpenOCD-devel <openocd-devel@lists.sourceforge.net>
wrote:

> On 24.02.2018 0:04, Jay Maynard wrote:
> More important is a small series resistor (33 ohm) on SWD - ringing 
> prevention. Again not necessary if the cable to adapter is short.

However, "short" may mean "really short" - I had signal integrity
trouble doing SWD on a STM32 using a busblaster (FT2232 - my old version
of the PCB has no series resistors on board), with 15cm cable. Adding
series resistors to SWD and SWCLK fixed that.

cu
Michael

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