How do I upload a sketch from Arduino IDE to an STM32F103C8?

[JChaj.1]

I have uploaded the maple bootloader and am trying to upload a sketch from the Arduino IDE (1.8.19 or 2.0.3). I get the following error:

Board identied as /dev/ttyACM0 (Maple Mini)

Upload fails:

Failed to open serial device.

setRTS(): TIOCMSET: Broken pipe

No DFU capable USB device found

dfu-util 0.7

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Waiting for /dev/ttyACM0 serial...Done

[Javier1]

>>No DFU capable USB device found

Arduino needs the correct arduino bootloader to use DFU (usb flash programming).

Did you previously flashed the wrong arduino bootloader? (maybe the one for a stm32f103c8t6 bluepill?)

I would recommend you to use an STLINK, arduino supports SW (ISP as they call it) .

[JChaj.1]

Thank you for taking the time to answer my question.

How do I know which is the correct bootloader? My understanding at this point is that the file to use it called generic_boot20_pc13.bin and is available from Roger Clarks Github. That is the one I am uploading to the board using an ST-LINKv2. That works fine, although I have discovered that the board must then be plugged directly into the PC rather than a USB hub to show up on /dev/ttyACM0.

Once the bootloader is uploaded the board shows up in the Arduino as a 'Maple Mini'. I have no idea whether this is DFU capable or not?

Since uploadfing using ST-LINKv2 works just fine, I would be happy to use that option. However where does the Arduino 'Serial' device output go? If I upload a sketch via ST-LINK-v2, the board does not appear to be accessible via the USB port or via A9/A10 as indicated on some tutorials?

[Javier1]

>My understanding at this point is that the file to use it called generic_boot20_pc13.bin

Show us, post some link, are you sure your board is STM32F301C8 and not STM32F103C8?

>However where does the Arduino 'Serial' device output go?

It goes to the USB, same place

[JChaj.1]

You are correct! Yes the board is an STM32F103C8!. My mistake in the title of the opening post which I have now corrected. I get nothing coming out of USB in terms of serial output.

[Javier1]

show us a picture of your board, is there a chance is an aliexpress bluepill?

[JChaj.1]

I don't buy from AliExpress, but that doesn't mean its not a clone. I puchased it maybe a couple of years ago from eBay. Its been sat in a box of bits ever since. The black heat-shrink covers a resistor I added as per instructions to reduce the resistance down from 10k to 1.5k.

[Javier1]

Just checking, did you move the corresponding jumper when flashing the arduino bootloader in your board?

https://www.youtube.com/watch?v=Myon8H111PQ

[AScha.3]

the 10k was wrong on all these boards, so 10-> 1k5 is right. is only needed for USB device working mode.

+ the unknown F301 mutating to well known F103 . :)

so now we know, what we talking about.

you have to know: you have 3 ways to start / load new program ->

• F103 fix built in bootloader , by pressing "boot" when power up (or releasing reset) _ DFU mode, but on F103c8 only on USART1 .
• with STlink connected via debug functions, working always with -> use programmer -> ***
• you load (with Stlink..) a bootloader program, maybe your "maple xx" or other, and then connect with USB -> cdc "serial" port -> to arduino or other

so first : choose, what you wanna do. (i use stlink always, just working...and arduino only on AVR boards)

[JChaj.1]

I just reviewed that video and I see there is a different URL for the library. I still had the library by Dan Brown installed. I have now updated the library. I have also tried the bootloader discussed in the video, but don't even get a /dev/ttyACM0 port with hid_generic_pc13.bin...

BTW, yes I am moving the jumper to the position shown before flashing.