After looking at the Schematics for the Hannah and April, I see that you are using pin 6 (vss2) as the pin you expect a ID code to come from. What is this was GND? I’m looking at trying to hack 2 boards that have an SD card slot, but where I have access to the pins. Unfortunately pin 3 and 6 are tied to GND, as Vss1 and Vss2) the cards are https://www.digilentinc.com/Products/Detail.cfm?NavPath=2,401,513&Prod=PMOD-SD which is really an I/O card connected to a SD card slot. Typically this would connect to a Xilinx FPGA card through General purpose I/O, so it could look just like a April card, except that it would not have the Atmel Id chip on pin 6. (yes I could hack it and add it, but that is not the goal.
The other card is a Xilinx Kintex-7 KC705 board, but it has exactly the same problem. https://secure.xilinx.com/webreg/clickthrough.do?cid=188020&cancellink=http%3A%2F%2Fwww.xilinx.com%2Fsupport%2Fdocumentation%2Findex.htm sheet 28.
Is ther a way to provide an ID from the other Data pins? Typically on FPGA boards, we imbed a Mac address or other ID in the FPGA code, so it’s changeable.
I’m afraid this is a hard-coded, non-negotiable requirement. Sorry.
The ID chip documentation is public without NDA so you may be able to implement the ID chip functions in FPGA. Well you still need to connect to pin 6.
If you need to use the imp in regular socket with grounded pin 6, then probably only option is to inject the id chip inside imp and disconnect imp pin 6 inside the case. The plasti case of imp seems to be press-fit type so it can be opened and closed again. Normally SD card plastic is sealed with ultrasonic welding and can not be opened. I am still waiting my imps so I can not say if the plastic is easy to open or not.
Injecting ID chip in IMP I think it’s not an option. The ID is for socket identification, not IMP identification - same card behaves different in different socket.
And anyway is good to chose the socket wise - a bad socket with big metal sheets will influence the Wifi in the card …
We are working on solder-down imps, which would have an internal ID (as they can’t be moved, it’s rather superfluous to have an ID chip).
Apart from not needing a socket or ID chip, they’re otherwise identical in feature set and performance to an imp card, and allow you to locate the LEDs and phototransistor where convenient. They’ll be available in both integral antenna and antenna connector variants.