Unknown USB device

STM32duino bootloader aka Maple bootloader
Posts: 301
Joined: Fri Dec 27, 2019 4:53 pm
Answers: 6
Location: Munich, Germany

Re: Unknown USB device

Post by stevestrong »

Now there are several versions of the bootloader, the older of them stays in bootloader for 3 seconds and jumps to the user code only after that time period to give chance the uploader app to upload.
The fastboot version does as I explained before, instead waiting it checks for some conditions and jumps directly to the user code if the case. In this case you have to set jumper BOOT1 to 1 or user USB serial.

Posts: 475
Joined: Thu Dec 19, 2019 5:30 am
Answers: 1

Re: Unknown USB device

Post by ag123 »

N5BOC wrote:
Fri May 08, 2020 3:08 am
No one seems to just use an ST-LINK. I don't understand why not really.
it is ok to just use st-link (v2) or even for that matter usb-uart. the slight benefit (with stm32f103) with the usb e.g. dfu (roger's) bootloader is that you can make do with just a single usb cable, no extra st-link v2 or usb-uart dongles is needed to upload firmware. using st-link or usb-uart is sometimes more convenient, dependent on circumstances and the use case.

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