Apple Freak
Member
Hi, I have a dev board that also uses the STM32F103RB and from the look of the schematic, the USBs are the same, except that on the Maple board it has 2 transistors and a signal from PC12. Can I use my own board with the IDE? I do have to flash a DFU to my chip, right? How do I do it?
Thanks!
gbulmer
Moderator
Apple Freak - The instructions for loading a Maple bootloader are at:
http://leaflabs.com/docs/bootloader.html#flashing-a-custom-bootloader
The Maple's USB behaves as two different USB devices, a serial device or DFU device. The Maple triggers the host PC to check which one it is using the two transistors and PC12. They pull one of the USB data lines, which the host PC USB interface senses, and that triggers the host PC to interrogate the Maple (over USB) to find out what type of USB device it is. This is called USB enumeration.
If your STM32F103 board can't do this using PC12, you'll likely have to rework the bootloader. It may be worth building the circuitry (or something equivalent) if you can get at the USB data lines.
(Full disclosure: I am not a member of Leaflabs staff.)
Apple Freak
Member
Thanks! All the information seems very clear now! But I want to ask, do you personally prefer using the Maple IDE? Or the original ARM instructions? I just learned a little about them and I use ST's Standard Peripheral Library. It's a little confusing so that's why I came here for Maple. But I still want to ask for someone's input.
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