STM32F405RGT6 custom board not working

[frotaitalos]

Hi guys, this is my first post here on the forum. I'm starting my learning in STM and I created a custom board with a STM32F405RGT6, I followed a basic MCU operation schematic that I found in a video on Youtube, but the MCU is not starting. I did several tests to check if the USB connection was correct, if the voltages also worked well and everything is ok. However, I saw that I really don't get a clock from the crystal, the crystal I'm using is already known to me from other projects. So I'm leaving here a print of the connection schematic and if anyone can give me some light on where to look for the problem that causes the MCU to not start, I would be very grateful.:grinning_face:

[frotaitalos]

Excellent, I haven't found the ST V3 in my laboratory, so I'm going to buy this V2.

[frotaitalos]

I'm still going to install the capacitors, I'm going to a store to buy them as I don't have that value here in the laboratory. I will post the resolution of the case here as soon as the capacitors are soldered to the MCU and I use the ST LINK V2 to communicate with the device.

[SofLit · Accepted solution]

Also, I didn't notice this at first glance:

You're connecting OSC_IN and OSC_OUT to PC4 and PC5 while it should be connected to PH0 and PH1 like provided in the datasheet:

I'm wondering what kind of Youtube link you're referring to!

[frotaitalos]

Hi Guys, I managed to communicate with the STM via USB and record a hello word on it.

I didn't have access to st link v2 and v3. However, I managed to correct the layout errors on my custom PCB. The crystal oscillator was actually on the wrong pins and the lack of VCAPs prevented the STM from starting. I managed to solder these components to the STM pins and everything worked.

Thank you for your support, I will be more attentive when following youtubers schematic :grinning_face_with_sweat:

[Pavel A.]

> I haven't found the ST V3 in my laboratory, so I'm going to buy this V2.

Why buy V2 if you can buy V3?

[frotaitalos]

Because I'm from Brazil, and unfortunately in the national market I can only find the V2 for sale, importing the V3 is very expensive. I have a V3, or at least I did, but so far I can't find it here at my company. I'm still looking and if I don't find it I'll end up buying the V3, since I discovered that the V2 on the Brazilian market is counterfeit.