Is there a replacement for the U3?

[dippaolo]

Is there a replacement for the U3?

Access to the STM32F105RBT6 microcontroller is difficult.

You can get it, but it's expensive :(

[SukkoPera]

No, feel free to mod the design to use a different IC.

[Bytedecode72]

i've got some GD32F105RBT6 coming instead of the STM32F105RBT6

[SukkoPera]

If it works, can you please provide a link to where those can be bought?

[ra1nb0w]

@Bytedecode72 any news with GD32F105RBT6? thank you

[ra1nb0w]

seems that also AT32F415RCT7 (from new GOTEK boards) is usable but not findable in the market

[Bytedecode72]

seems that also AT32F415RCT7 (from new GOTEK boards) is usable but not findable in the market

if you contact keir fraser i believe he has some f415's still if not they can be purchased on aliexpress

[Bytedecode72]

@Bytedecode72 any news with GD32F105RBT6? thank you

i got the chips just need to order other components and assemble then get debug firmware on there to see if anything is tripping it up.

[ra1nb0w]

Thank you @Bytedecode72 for the update. Report back when it will work (or not).

[Bytedecode72]

Thank you @Bytedecode72 for the update. Report back when it will work (or not).

i will do just waiting on the components now all sourc

e

[ra1nb0w]

I bought an GD32F105RBT6 too. We will see ;-)

[SzymonGk]

Thank you @Bytedecode72 for the update. Report back when it will work (or not).

i will do just waiting on the components now all sourc e

Hi, any update regarding GD32F105RBT6?

[SzymonGk]

I do not think that GD32F105RBT6 is compatible substitution for STM32F105RBT6. I soldered IC to the board and programmed with hex flie provided for STM32F105RBT6 (FlashFloppy), unfortunately device does not work. I programmed it via two methods, first via Demonstrator Gui and second via StLink2 soldering two thin wires to pins 46(SWDIO) and 49(SWCLK). I tried also Giga Devices programming software but it crashes when hex file selected.

[SukkoPera]

It should be compatible but it requires a dedicated firmware, I think. Please see the FlashFloppy project page.