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** [tickets:#146] Connection under reset on ST-LINK-v2 doesn't work-NRST looks
like inverted?**
**Status:** new
**Milestone:** 0.9.0
**Created:** Mon Mar 06, 2017 11:38 PM UTC by RayeR
**Last Updated:** Mon Mar 06, 2017 11:38 PM UTC
**Owner:** nobody
Hi, I use ST-LINK-v2 (the FW updated to the latest ver. V2J27M15) from nucleo
board for programming an external target with STM32F030C6T6 MCU via CN4 (VDD,
SWDCLK, GND, SWDIO, NRST are connected to the target). In case if I reconfigure
GPIO used by SWD by a mistake I need to use "Connection Under Reset" option in
ST-Link Windows utility to be able to connect. It works fine. But I'd like to
do the same with OpenOCD (0.10.0-00113-g0f83948 24.1.2017). When SWD GPIOs are
not reconfigued then OpenOCD works fine. But I cannot reproduce "Connection
Under Reset" behavior. I tried many reset_config options, e.g. reset_config
srst_only srst_nogate connect_assert_srst that I had found on this forum but
nothing works. I hooked the scope to ST-LINK and watch what's going on. If
connect_assert_srst then it starts to control NRST pin but it seems the signal
is inverted! And I cannot find any OpenOCD option how to invert it back to
desired level (normal level should be 1, active 0).
So let's see, here's the scope of how ST-Link utility is doing "Connection
Under Reset":
http://rayer.g6.cz/1tmp/nrst_stlink.png
And here's how OpenOCD do it with **reset_config srst_only srst_nogate
connect_assert_srst**
http://rayer.g6.cz/1tmp/nrst_openocd.png
Could it be an OpenOCD bug? Or did I miss something?
BTW I also found that delays options like adapter_nsrst_delay doesn't change
the waveform when different values used.
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