USB DFU configuration / use

[lifeorhell]

Hi,

I used a F105RCT6 in a custom board, i want to use the DFU mod.

When I generate the project with cubemx I select USB DEVICE and DFU mid, i change the clock configuration corectly. 

I generate the FW, and i flash him.

The DFU is running, i open cubeprogrammer, i can read the mcu but i can't flash him... or i flash but the fw is don't running, i'm don't understand... 

For me, just the dowload is block.

Help me 🙂

[TDK]

Can you use the built in bootloader USB DFU instead?

[lifeorhell]

I can't :\ 

To give you the global context :

My objective is to use the usb port in Virtual COM mode, and to go in DFU mode with a specific command on the this virtual port. 

My firmware is running good, i send a specific command and is going in DFU mode, i can read that's nice, but i can't erase and write ( i juste can read ) 

I hope I was quite precise

[TDK]

> My objective is to use the usb port in Virtual COM mode, and to go in DFU mode with a specific command on the this virtual port. 

You can jump to the bootloader at will. Doing so will cause the board to be re-enumerated as a USB DFU device.

https://community.st.com/t5/stm32-mcus/how-to-jump-to-system-bootloader-from-application-code-on-stm32/ta-p/49424

[lifeorhell]

i don't resolve my problem :(

I think the problem is : i doesn't have CPU information loaded in dfu mod (see picture )

 

[TDK]

What's the problem? Looks like DFU is running fine.

[Shirley.Ye · Accepted solution]

Please check your reference manual for the flash chapter. Generally we do not support write-while-read function for flash, so you need to use IAP(bootloader) to program the internal flash 

[lifeorhell]

Do you know how I can use the bootloader to update in USB mod ?