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Zephyr project on STM32

   Zephyr Workbench, a VSCode extension to manage Zephyr on STM32.
It enables users to easily create, develop, and debug Zephyr applications.
Main features:
  • Install host dependencies.
  • Import toolchain and SDK.
  • Create, configure, build and manage apps.
  • Debug STM32.
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System Workbench for STM32

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Openocd STLink reset not working

Posted by Rabbe on 2018-09-01 23:16

Hi, I am trying to debug my STM32F765VGT6 micro controller.

Therefore, I connected the SWDIO, SWCLK, GND and VCC to a STLink V2 adapter.

Now, I can use “st-flash” to flash programs to the STM32, but OpenOCD does not work:

Open On-Chip Debugger
> reset halt
timed out while waiting for target halted
TARGET: stm32f7x.cpu - Not halted
in procedure 'reset'
in procedure 'ocd_bouncer'

How do I have to change my openocd.cfg to allow resetting the controller?

Note that NRST is currently hard-wired to VCC.
Nevertheless, “st-flash reset” successfully restarts the MC, so resetting has to work somehow...

stm32f7x_stlink.cfg (423 b)
Reads: 13103
Link
Posted by LaurentL on 2018-09-03 10:31

Hello,

If you didn’t connect the Reset line, you will need to use the correct reset settings, like this one:
reset_config none separate

The st-flash reset is maybe a “software system reset” so it is not using the reset line of stlink.

Rgds,
Laurent

Link

Posted by Rabbe on 2018-09-05 18:38

Hi,

thank you @LaurentL for your answer.

How should the electrical circuit look like, if I wanna use a reset-button and a pin, to connect the micro controller reset with the StLink adapter?

Thanks for your help :-D

kind of regards
Rabbe

Link
Posted by bluenow on 2018-09-05 23:35

In most of cases, the CPU /reset pin/signal work as OC-ored logic, so the pull down will effectively reset the CPU core; It usually be pulled up through a resister to VCC; DO NOT directly connect it to VCC.

There is an output/high impedance (/RST) signal/pin on STLink V2, should be connected to Micro-controller’s chip /Reset. So it will be able to reset the the micro-controller the STLink V2. Through Jtag/SWD command, it can soft reset the micro-controller, if the debug unit is reachable and you configure the OpenOCD script properly.

Link

Posted by LaurentL on 2018-09-06 10:13

Hello Rabbe,

The STM32 mcu has an internal pull-up on reset pin, so you just need to connect pin 15 of STLink (on the 20 pin connector) to the Reset input of mcu. Nothing else.

And remove your hard wired reset connection to VCC.

Rgds,
Laurent

Link

Posted by Rabbe on 2018-09-09 14:53
Thank you guys for your help :-D
Link

 

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