I noticed someone pointed an RTC to use in a shield with this board.
It already has a 32kHz crystal and internal hardware for RTC support. I mean real hardware specific for the RTC function.
For those that like the Arduino-style programming, there is a port (ok,
one third-built) of the libmaple in http://forums.leaflabs.com/topic.php?id=1268&page=3
. I added a few defines and support for the onboard random number generator.
I'm writing part of the driver for the RTC, but first I need to get some sort of communication since the USB implementation for the libmaple is different than the one in this Discovery board.
What I think would be really great expansion board for this chip is:
- SD card connected in the SDIO port (there are specific bits to access the SD/MMC cards).
- Ethernet interface.
- Separate power supply.
- LCD interface.
- Xbee interface? Or a Xbee explorer/FTDI chip header to communicate with the PC (at least while there isn't an implementation for the USB comms).
- Then of course, the break out from the double row header.