My STM32F205 processor cannot be found

[YCoşg.1]

Hi!

I designed my own development board with the STM32F205 microcontroller. But I can not find my processor via stlink and uart in any way

How can I fix this problem?

[TDK]

Could be a layout problem. You can post your schematic if you want.

Check your power rails, make sure st-link is connected correctly.

[YCoşg.1]

Here is my reset connection. The DTR pin goes to the ch340 chip.

St link SWCLK, with SWCLK, DIO, connected with DIO.

(I just installed a push button for now)

Thank you for the answer.