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Published 20 hours ago • verified publisher icon SukkoPera

Is there a replacement for the U3?

Open dippaolo opened this issue 3 years ago • 14 comments

Is there a replacement for the U3?

Access to the STM32F105RBT6 microcontroller is difficult.

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

dippaolo avatar May 14 '21 06:05 dippaolo

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

SukkoPera avatar May 14 '21 14:05 SukkoPera

i've got some GD32F105RBT6 coming instead of the STM32F105RBT6

Bytedecode72 avatar Dec 02 '21 08:12 Bytedecode72

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

SukkoPera avatar Dec 02 '21 08:12 SukkoPera

@Bytedecode72 any news with GD32F105RBT6? thank you

ra1nb0w avatar Mar 05 '22 21:03 ra1nb0w

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

ra1nb0w avatar Mar 09 '22 09:03 ra1nb0w

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 avatar Mar 21 '22 18:03 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.

Bytedecode72 avatar Mar 21 '22 18:03 Bytedecode72

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

ra1nb0w avatar Mar 21 '22 18:03 ra1nb0w

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 bom e

Bytedecode72 avatar Mar 25 '22 13:03 Bytedecode72

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

ra1nb0w avatar Mar 25 '22 13:03 ra1nb0w

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 bom e

Hi, any update regarding GD32F105RBT6?

SzymonGk avatar Oct 22 '22 17:10 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.

SzymonGk avatar Jan 22 '23 18:01 SzymonGk

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

SukkoPera avatar Jan 22 '23 19:01 SukkoPera