STM32CubeIDE Serial Port Connection

[mathieusteketee]

I  have a STM32F405 and am trying to setup UART to connect to my pc. As of now I have connected it with an ST-Link/V2 and later on want to program it over USB-C using UART. See the wiring diagram:

I have used PA10 and PA9 for RX and TX.

The parameter settings are as followed: 

When it comes to the GPIO settings I have set the maximum output speed to "Very High" (not sure if this is correct).

I have watched a guide on YouTube (https://youtu.be/dnfuNT1dPiM?t=4896) about how to getstarted in the STM32CubeIDE and stopped on the part about the "Command Shell Console":

At "Connection name" I had none and preesed "New..."

Now on the "Serial port", I dont know what to do. See image:

I am using a Windows 11 computer and heard something about using Tera Term or Putty, but I dont know how.

Can someone explain some more about the Serial port setting?

Thank you

[SofLit · Accepted solution]

" I have set the maximum output speed to "Very High""

Not optimum but it works. I suggest Low to set them to low instead of very high.

Now regarding the config of the Hyperterminal:

You need to check what is the Comport number assigned by windows on your computer. You need to go to Device manager on your computer and go to Ports (COM & LPT) list:

This is what I found as comport number : COM26. You can find another number. This is what you need to put in Serial port in the CubeIDE console:

Hope I answered your question.

[Tesla DeLorean]

You've got a driver for this CH340C ? Installed and working?

You can see it in Device Manager? At what COM port.

[mathieusteketee]

Thank you for your reply @SofLit .

I will set the Maximum output speed to low then.

Yes, this answers my question.:beaming_face_with_smiling_eyes:

I however don`t seem to get any Comport when I plug my USB-C cable to the STM32F4. 

Could this have something to do with the settings in the bootloader perhaps?

I have tried using the .bin file which is located in the "Debug" folder when I generated my code. 

Do you have any tips regarding this?

Thank you!

[SofLit]

No relation to bootloader or anything else.

The Comport is part of ST-Link module and not to the target MCU.

You need to find and get a new Comport number in the "Ports" list as shown above, otherwise you have an issue on ST-Link module side.

Are you using a rechargeable cable or data cable? you need to use a data cable otherwise it won't work.

[Tesla DeLorean]

>>I however don`t seem to get any Comport when I plug my USB-C cable to the STM32F4.

Sorry, not familiar with your board.

You have the USB to the STM32F4? And you have a USB CDC Device firmware loaded on it? BOOT0=HIGH ROM System Loader, would be "STM32 BOOT LOADER" not a CDC/ACM/VCP

Or USB-C connected to WDH CH340C ?

[mathieusteketee]

Hey @Tesla DeLorean ,

I have forgotten totally about the driver for the CH340C. Very good shout thank you!

I will download the driver and give it a shoot :folded_hands:

[mathieusteketee]

Okay, that is good to know. 

I am using an USB-C to USB-C cable between my computer and the STM32. But since I havent installed the driver yet for the CH340C, it would properly not work anyway. 

Do you know if USB-C to USB-C is a data cable I can use @SofLit ?

Thank you.

[mathieusteketee]

I have a custom PCB. I use a USB-C to USB-C cable to the STM32F4. I cant seem to recall I have a USB CDC Device firmware on it. Can I do this in STM32CubeIDE?

I can try to explain my setup somewhat better. The STM32F4 is power not powered by the USB-C, it uses another source on the PCB. The pins PA9(TX) and PA10(RX) go to the serial chip (CH340C). See wiring diagram:

From the serial chip (CH340C) pin D+ and D- are connected to the USB-C port. See wiring diagram:

RX/TX are correct from the STM32, such that RX goes to TX on the serial chip and TX goes to RX.

Hope this helps understand the problem. 

[mathieusteketee]

I have now installed the driver for the the CH340C and should be working.

I however do not see the Com port in the Device Manager.

Do I need to enable UART somewhere in the STM32IDE program?

Thank you.