making my own board from scratch (literally)

[RDR102]

so my school has an old pcb milling machine that i want to bring back to life, so the first thing i want to do with it  is to make a stm32f103c6t6a board, can someone check if that schematic could work and if i can implement other capabilities in this board?

ps (the pcb milling machine is a lpkf protomat s42 that uses boardmaster and some old version of circuitcam)

[RDR102]

also i didn't quite understand how i should implement oscillator for clock, i put a 16mhz for now i may be implementing a 8mhz oscillator, do i need a 32.768K oscillator or i can operate usb in a reliable way without it?

is that implementation good?

[Tesla DeLorean]

The F103's typically use an 8 MHz crystal to permit 72 MHz PLL operation, and USB / CAN clocking. It can probably take a 16 MHz one, but you'd be constantly modifying example code, and HSE_VALUE settings.

The 32.768 KHz LSE is needed only if you need the RTC and STANDBY operation, as it's the only clocking source with primary power off.

[RDR102]

For the rest is my schematic ok?

[######]

Just wondering how / why you chose PB10 and PB11 for the data lines of the USB? I might be incorrect, but looking at Page 27 of this link USBDM and USBDP are on PB11 and PB12 ... https://www.st.com/content/ccc/resource/technical/document/datasheet/0d/93/e0/d7/77/bf/4c/54/CD00210843.pdf/files/CD00210843.pdf/jcr:content/translations/en.CD00210843.pdf

Might be worth double checking that your choice is correct against the datasheet for the exact IC.

[Piranha]

The R2 is not connected... But the best question is why are you choosing that old and limited MCU instead of something newer?

[ONadr.1]

Yes, PB11 and PB12 are for USB connection. And I would also put two small resistors of approx. 10-20ohm on the USB data wires.

[ONadr.1]

Sorry, PA11, PA12

[RDR102]

Thanks for the reply, this was my first try making schematic and as I didn't had cube MX installed on my machine I couldn't look up the right pin for usb, on the newer design that I did the pin are set on PA11 and PA12, I will also implement a can bus chip on board (just for fun) a classic mcp2515 , and I will try to create some driver for a temperature sensor, but for now I'm trying to understand more about the oscillator configuration

[RDR102]

I got it for a few cent from AliExpress with other chip, I thought it was a decent way to start making a board and even if I make some mistake I wouldn't waste too much money and on the other hand if it work I can buy a more recent chip ,I also have a basic stm32f103c8t6 and a stm32f103ret6, I got them on AliExpress for less than 50cent for each and they don't seem to be fake