SWD for STM32F4VGT6

Rafael Bachmann Guest 2018-09-17 16:46 #5559064

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Hello,
I got a cheap barebones STM32F4VGT6 board, admittedly it was somewhat of 
an impulse buy. It is made by diymore:

https://www.ebay.com/itm/STM32F407VGT6-ARM-Cortex-M4-32bit-MCU-Core-Development-Board-STM32F4Discovery-/311702413371

So far, I have used dfu-utils to burn my programs, which are generated 
by STM32CubeMX. The dfu-utils method is described here:

https://github.com/dwelch67/black_pill_too

I would like to use a NUCLEO boards' SWD programmer to be able to debug 
the MCU, but it does not break out the reset pin. Nonetheless, on the 
back side silk screen it says:

SWD: PA13/DIO PA14/CLK

Do I have to pry the NRST line from the reset button, or can I use just 
those 2 lines for SWD?

Thanks for your help.

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Christopher J. (christopher_j23) 2018-09-17 17:29 #5559105

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Rafael Bachmann wrote:
> SWD: PA13/DIO PA14/CLK

Those two pins are sufficient for SWD (together with a GND connection 
obviously). You do not have to route the rst-Pin to your ST-Link unless 
you e.g. want to do a "connect under reset" but you could also do that 
manually by holding the reset button and releasing it after initiating 
the debug connection.

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