STM32F407 won't boot

[Geocheats2]

Hello

I designed a board based on stm32f407 and while i am pretty happy it finally got delivered i don't seem to be able to boot it

I am using the cheap ST-LINK v2 clones from the usual suspects and for some reason i don't seem to be able to get any output on the OSC

I would love your help

Please tell me what would you like me to upload i will start with the MCU Schematic

Please not that i haven't pulled up RST on +3V3 on the schematic but i do have on the board also i have tried connecting BOOT0 to GND and to +3V3 (not at the same time ofc)

Looking forward to your replies

George

[julian1]

From memory..

Does it answer back on the st-link?  The external oscillator won't run unless the flashed code actually enables hse, so it's not a very useful test.

boot0 should be pulled low. boot1 doesn't matter. reset should be pulled low, then high.

Vref+ *and* I think vbat need attention, and are check by the st voltage supervisor, before it turns on the 1.2V core.

check the voltages on vcap1 and vcan2. If they show 1.2V then the core mcu is powered on, and the issue is configuration/higher - eg. swdio wiring or boot0/reset.