STM32F103RBT6 MCU not detected by programmer – BOOT0 pin tied to GND on custom PCB

[asking]

Hello everyone,

I have designed a custom PCB using STM32F103RBT6 and I’m facing a serious issue:
The MCU is not getting detected by the programmer.

Symptom:

When connecting via SWDIO, SWCLK, 3.3 V, and GND, both STM32CubeProgrammer and ST‑Link Utility fail to detect the target.

Power rails are verified: 3.3 V present at VDD pins, proper decoupling capacitors placed close to supply pins.

No shorts observed on the board.

Important hardware details:

Boot0 pin (on my design) is directly tied to GND by mistake – I’m wondering if this could block programming or reset behavior.

NRST pin has a 10 kΩ pull‑up to 3.3 V as recommended.

BOOT0 is pulled low (GND) on the board without Resistor, any problem?

 

Any advice would be greatly appreciated!
schematic snippet attached.

Thank you in advance for your help.

[Tesla DeLorean]

What voltage do you have on VDDA / AREF ?

Needs this for Power-On-Reset

Inspect voltage at NRST, is it clamped Low by the device?

[asking]

VDDA i am using TL431B using 10K on ground and 2.2K on positive side. Getting 3.041V and same is supplied to VDDA. 

 

NRST pin I have 10K pull up resistor tied to 3.3V.

[STOne-32]

Dear @asking ,

VDDA must be connected to VDD and also VBAT not left unconnected. Recommended to connect To VDD and 100nF capacitor  if no battery is present .

R1 to be removed on NRST pin we already have internal pull-up to VDD tied internally . Just keep the 100nF cap . Can you check theses points and let us know . If possible also a picture of the Package marking  .

Hope it helps you ,

STOne-32

[asking]

Measured Voltage is 3.329V on pull up with resistor and without resistor. Also i have connected VDD to VBAT, still controller is not responding to programmer same error.