Not able to flash my custom pcb

[Premjith99]

iam attatching a pdf of my ki cad , let me know the what prevents to flash my code . this is the below error message coming while iam trying to flash "

Starting server with the following options:

Persistent Mode : Disabled

Logging Level : 1

Listen Port Number : 61234

Status Refresh Delay : 15s

Verbose Mode : Disabled

SWD Debug : Enabled

InitWhile : Enabled

Target no device found

Error in initializing ST-LINK device.

Reason: No device found on target."    could you please verify the circuit

[Ozone]

There is far too little information in the schematics alone to judge why a finished board does not run.

Did you check the supply voltage, at the MCU pins directly ?
Did you check the current consumption of the board ?
Did you validate the PCB's connections from the debug pins to the MCU pins ?

[TDK]

The schematic looks okay. Is the board powered? How? What programmer are you using? Is it genuine? Can STM32CubeProgrammer see the programmer? Can it see the voltage on the board?

[Andrew Neil]

Welcome to the forum.

As @Ozone said, you need to give more detail - see: How to write your question to maximize your chances to find a solution

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@TDK wrote:

What programmer are you using? Is it genuine? 

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@Premjith99 see: How to recognize a genuine ST-LINK/V2 versus a cloned one.

You don't have NRST on your SWD connector - always good to include that!

[Ozone]

I would connect a debug adapter to a custom board only once all mentioned checks are ok.

Not to mention, I would have recommended to begin HW design with smaller and simpler MCU.
Many C0xx and F0xx devices come e.g. in TSSOP-20 packages.

[Tesla DeLorean]

Check part orientation

Check voltage on VCAP pin, expect 1.25V

Check voltage on NRST pin, expect high level, ie 3.3V

Check you have Vtarget (pin 1/2 on 20-pin) to the ST-LINK, needs 3.3V from your system. Check that STM32 Cube Programmer reports this voltage.

Check you have GND to ST-LINK