2024-11-06 01:38 PM - last edited on 2024-11-06 03:16 PM by Andrew Neil
I am using nucleo board, however, I try to use debugger on board for external board or stm32 microcontroller. I notice 6pin swd (cn6) on debugger. the first pin is VDD_targert. I followed up the wiring and connect to external target board. When I connect usb to pc, I found out pin 1(VDD_target) on CN6 doesn't have 3.3V. So If I would like to use this debugger for external target, I need power on target board or microcontroller to get this pin to have 3.3VDC, right?
Thank you for any help
2024-11-06 02:02 PM
You'd need to disconnect the local target.
You can use the 3.3V / GND to power a secondary board, providing it's not drawing a lot of current.
Connect the SWDIO / SWCLK to the External target.
What external board, using what STM32? Perhaps you can attach a schematic.
2024-11-06 03:18 PM
@yang hong wrote:I am using nucleo board, however, I try to use debugger on board for external board or stm32 microcontroller
Did you follow the directions for this in the Nucleo Board's User Manual?
@yang hong wrote:the first pin is VDD_targert.lp
This is an input to the debugger: it senses the target's supply voltage - it does not supply power to the target.
2024-11-12 11:03 PM
HI this pin is vdd from target application, it has a diode in the main path. it should be powered from outside the nucleo board.
2024-11-12 11:08 PM
Yes you can use 3.3V pin