Pito wrote:1. usb - 1k5 stuff - the switch - does the highside pnp work fine?
Pito wrote:2. usb - protection diodes - do we need them?
Pito wrote:3. boot0/boot1 - a pull down resistor would be ok? Which of them we actually need?
Version for F2/F4 uses different ESD protection and lacks
external disconnect cirquitry. These changes are necessary
to enable F2/F4 chips work properly in all supported USB modes
(Device/OTG) and with different powering (self powering and
RogerClark wrote:The minimum you need to do is pull Boot0 high to prevent the STM32 randomly entering its internal Serial bootloader, when the board is powered up
The Maple Mini only pulls Boot0 low, and leaves Boot1 floating, and this works Ok as it comes pre installed with the Maple bootloader.
However its a pain to reflash the Maple mini via serial, because when you press the button to pull Boot0 low, Boot1 is still floating and is randomly High or Low, and this effects the serial bootloader.
Probably.... weakly pulling Boot1 high, e.g via 22k ( or higher) would still allow you to use the Boot1 as GPIO
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