How to debug STM32 MCU directly

[adam12]

Hello. 

I'd like to debug STM32H723ZG Nucleo Board, connecting directly with PC. 

Instead of the basic USB-mini cable, is it possible to cut and work on the USB cable to separate it into 5V, DP, DM, and GND, and then directly connect it to the board for debugging?

In the User Manual, 
the pins for DP and DM are PB14 and PB15.

I attatched the screenshot of manual and my hardware setup. 

thanks.

[KnarfB]

Referring to UM2407 User manual STM32H7 Nucleo-144 boards (MB1364)

there is STLINK-V3E USB Micro-B connector (CN1) on top for the ST-LINK debugger and 

USB OTG_FS connector (CN13). You can use USB on the STM32H7 for your own purposes, but not for debugging. Debugging is via the SWD interface which is conntected to the ST-LINK debug chip on top connected to CN1. 

For firmware updates (not debugging), STM32H723ZG can use USB DFU with the help of internal ROM code (System Memory Boot).

hth

KnarfB

[AScha.3]

Hi,

>I'd like to debug STM32H723ZG Nucleo Board, connecting directly with PC. 

Ok, we all do this. :)

>is it possible to cut and work on the USB cable to separate it into 5V, DP, DM, and GND, and then directly connect it to the board for debugging?

What is more "direct" than the USB cable direct to PC ?? separate 5V, gnd...change nothing, except: it might be no more a working USB connection. So how you want improve the micro-USB --- USB-A cable ?

[adam12]

Then, does the manual’s statement that CN1’s DP and DM are connected to PB14 and PB15 mean that these pins belong to the ST-link MCU rather than the STM32 MCU?

What I intended to do was to perform the same operation by directly connecting to the MCU’s pins instead of using CN1, after cutting the USB cable into Vcc, DP, DM, and GND.

Thanks.

[adam12]

What I meant by "direct" was not to utilize the USB cable’s connector, but rather to cut the cable and separate its internal wires (Vcc, DP, DM, GND) to connect each individually.

Ultimately, I wanted to verify whether the USB cable would operate properly using this method.

Thanks.

[KnarfB · Accepted solution]

> Then, does the manual’s statement that CN1’s DP and DM are connected to PB14 and PB15 mean that these pins belong to the ST-link MCU rather than the STM32 MCU?

Yes, as written in the head line of that table. See also the board schematics available from NUCLEO-H723ZG - STM32 Nucleo-144 development board with STM32H723ZG MCU, supports Arduino, ST Zio and morpho connectivity - STMicroelectronics

For using USB on a STM32 MCU itself, not the ST-LINK, see 

Introduction to USB with STM32 - stm32mcu

hth

KnarfB

[adam12]

Thanks. 

I wanted to verify whether using a USB cable by separating it in this way was acceptable.
According to your response, while using a separated USB cable is acceptable, connecting it to the STM32H723ZG MCU is not appropriate since it is not connected to the ST-link.

My question has been resolved, and thank you again for your answer.

Sincerely.