STM32F (Blue Pill ++)
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Schematic
PCB layout files EasyEDA
Gerber files
The board came about cause of a need to experiment with higher performance
processors other then the one that comes on original Blue Pill. Secondly we
needed peripherals from other processors for couple of the projects. Yes you can
de-solder original processor from the board and replace it with one from other
family of processors, however that is just a work around and its still required
to purchase a Blue Pill board and alter it. Additionally we did not wanted the
32.768Khx crystal and there was no pins connected to those ports. Basically what
we needed was a bare board to which a controller can be mounted with primary
crystal and programming port.
One thing we wanted was a battery backup for onboard RAM and clock, however to
keep the board size as small as possible so we decided to just have battery
connection pin that we can connect a battery to and for the benefit to have
battery on board for the odd time it did not make sense to make it that much
larger. There are resistor dividers to monitor the battery where a solder jumper
needs to be shorted to enable it.
The board has all of the pins routed to the 2 edges with swclk and swdio pins
only available on the programming port.
Yes there are other development bords available however we wanted something that
would be easily plugable onto regular perfboard. And with 0805 SMD copmponents
the boards can be easily assembled on bench
Documentation