2024-08-18 08:33 PM
Thank You
2024-08-18 10:28 PM
Is the MCU running at all, eg blinking a LED? If the ST-LINK is not powered up, it may keep the MCU in reset.
If you are using Tx, Rx, and GND pins directly from the MCU pins (Nucleo board connectors), there is not much else what could fail. Electrical levels? Clock generation? A scope would come in handy here.
Guess you already found the board schematics NUCLEO-F446RE - STM32 Nucleo-64 development board with STM32F446RE MCU, supports Arduino and ST morpho connectivity - STMicroelectronics
hth
KnarfB
2024-08-18 11:00 PM
@harry123 this NUCLEO gets its clock for HSE from MCO of the onboard debugger (ST-LINK/V2-1). However, if you are not supplying the NUCLEO from USB, but separately, you would have to provide an alternative clock. To do this, you can either use an internal clock or solder a crystal to X3 plus the associated R, C and solder bridges SB (see UM1724, section 6.7).
Hope that helps?
Good luck
/Peter