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    • Flashing without connecting NRST

    Posted by skoehler on 2019-05-19 20:43

    Hi,

    why is it necessary to connect the NRST of my MCU to the ST-Link? I have no problem connecting to the target with the ST-Link utility but I do have problem flashing/debugging when I use SW4STM32. Well, problems is an understatement: it's impossible.

    My target is the infamous STM32 Blue Pill (STM32F103C8T6). The reset pin is exposed, but on the 4-pin SWD connector (has gnd, swio, swclk, and 3.3V).

    The ST-Link utility is clearly able to reset/half the target via some SWD commands, it seems. I believe openocd supports that as well. See http://openocd.org/doc/html/Reset-Configuration.html

    Has somebody got a clue whether it's working? If so, where would I add the openocd options to switch from hardware reset (via NRST) to emulation reset (via SWD commands)?

    Reads: 13543
    Posted by roland25 on 2019-05-19 21:28
    In debugger configuration, Debugger tab, Configuration Script, Mode Setup, Reset mode combo box, select "Software system reset"
    Posted by skoehler on 2019-05-20 00:53
    That works like a charm. That setting is somewhat hidden though.