Ron K. Jeffries wrote: > Apolgize for asking a question I would not need to ask if I understood > scematics.
It's not so difficult :-) Here's the current version: http://downloads.qi-hardware.com/people/werner/anelok/tmp/anelok-20140711.pdf Let's stay at the first page ... > In Anelok latest design, are there any unused I/o pins such as I2C or SPI? There is one unused GPIO pin, right on top in the middle, #42 (PTD1). Another one is at the bottom, a bit to the right, #21. But that's the NMI input and I don't want to mess with it, so I treat it as unusable. There is a hidden one on the left side, #7 (PTE20), which I routed to GND because I had to connect to ground at this place and had no other way to get it. With a better PCB-making process, no such trick would be needed and the pin would become unused. So of these three, only PTD1 could be easily used for general-purpose tasks. It is not routed to any pads or such - there isn't much room in that area. If you look at http://downloads.qi-hardware.com/people/werner/anelok/tmp/anelok-20140712.png you can see it in the top image at the left side of the larger chip: while there would be a bit of space to bring the trace out, the neighbouring traces close ranks a few mm outside the chip. Back to the schematics, page 4, you can see the other MCU. This one has a lot of unused pins. Also in this case, there is little space to do something with them. And even then, the fewer little antennas this chip sprouts, the better. By the way, if you're looking for a board with the same MCU and lots of I/Os to play with, Freescale have made this nice eval board: http://www.digikey.com/product-detail/en/FRDM-KL26Z/FRDM-KL26Z-ND/4234022 - Werner _______________________________________________ Qi Hardware Discussion List Mail to list (members only): [email protected] Subscribe or Unsubscribe: http://lists.en.qi-hardware.com/mailman/listinfo/discussion
