Raceflight Failed To Open Serial Port Full Chip Erase

Connect with boot short, and BF config show DFU mode correctly.

Flashing RTFQ Revo Acro via USB-DFU hangs in Erasing.-state.

No progress bar.

In my log, there was a status not read protected anyway, so I dont think this is the problem in my particular case.

Only a major problem when connecting to bootloader via a UART.

An F3 with a dead USB port can still be flashed over a serial port, but not any F4 or F7.

But that is not the topic of this case, different issue 477.

The only exception could be a user disconnecting the board while it is still erasing the memory.

The bootloader actually performs a mass erase after read protection is removed and then reboots into some unknown state.

Therefore, I now introduced a pseudo-delay of 20 seconds to make the user waits after initiating the unprotect command (my boards take up to 18 seconds when performing mass erase).

Unfortunately, we dont really have an idea how long erasure takes.

We can only guess by manually triggering a mass erase and timing it.

So, when using my branchmodification, either use the newest version of my branch or make sure to wait for a bit after it instructs to unplug and re-connect, say, 10 seconds or so.

Disconnect and re-connect USB, nothing is actually flashed.

App log.

And behold, now everything works Tried both with forced DFU mode No reboot and normal soft DFU mode.

Both worked. The progress bar even restarts properly, going from left to right when flashing.

To get the flash to work I only selected manual baud rate of 256000 in DFU connection.

Worked fine afterwards however every time I save a change in the GUI it disconnects the serial port.

Raceflight Failed To Open Serial Port Full Chip Erase

Still hangs when trying to flash with Full Chip Erase enabled, same as the ordinary BFC.

I rebased my branch to include 344, i.e.

Thank you so much for this fix I was going crazy trying to get my board to flash.

Do we have some other F3 VCP targets to compare LUX for example.

Are all F3 VCPs broken or just some I only have two Revo (F4) clones, and those are only semi broken.