Dear Adeel,

Check your the status of st-link connection.

Your log has a clue that "Error: open failed".

That means "Can not open jtag or st-link device"




On Tue, Jul 12, 2016 at 6:09 PM, Adeel Mohammad Malik <
[email protected]> wrote:

> Hi all,
>
>
>
> I followed this guide
> https://github.com/RIOT-OS/RIOT/wiki/Getting-started-with-STM32F%5B0%7C3%7C4%5Ddiscovery-boards
> to flash RIOT code onto a STM32F4DISCOVERY board. I get the following
> error:-
>
>
>
> command: "BOARD=stm32f4discovery make flash"
>
>
>
> Compiling successfully.
>
>
>
> ### Flashing Target ###
>
> Open On-Chip Debugger 0.10.0-dev-00325-g12e4a2a (2016-07-12-10:00)
>
> Licensed under GNU GPL v2
>
> For bug reports, read
>
> http://openocd.org/doc/doxygen/bugs.html
>
> Info : The selected transport took over low-level target control. The
> results might differ compared to plain JTAG/SWD
>
> adapter speed: 2000 kHz
>
> adapter_nsrst_delay: 100
>
> none separate
>
> srst_only separate srst_nogate srst_open_drain connect_deassert_srst
>
> Info : Unable to match requested speed 2000 kHz, using 1800 kHz
>
> Info : Unable to match requested speed 2000 kHz, using 1800 kHz
>
> Info : clock speed 1800 kHz
>
> Error: open failed
>
> in procedure 'init'
>
> in procedure 'ocd_bouncer'
>
>
>
> Done flashing
>
>
>
> Any clue what could be causing this?
>
>
>
> /Adeel
>
>
>
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>
>
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