From: Craig H. <cr...@gu...> - 2007-01-23 18:21:03
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On Jan 22, 2007, at 7:31 PM, j Zee wrote: > Morning, > I have an application when I want to basically replicate the > functionality of the NetCF card that connects to the 92-pin > connector on a Connex board, but I also need at least one GPIO pin > to connect a switch to. In looking at the connector, I do not see > any unused GPIO pins.. (at least none labeled as such) I do see > some pins that refer to the MMC I/F that I will not be using but do > not know if they are GPIO pins in reality. > Are there any GPIO lines available in this planned configuration or > do I have to go to a memory mapped location scheme to read my "switch" You're right; all the GPIO lines are used on the netCF. I think you probably have 2 choices here: 1. Wait for the upcoming 120-pin connector which replaces the 92-pin connector on the next-gen gumstix -- it has a bunch more GPIO lines coming off on it, so there will be some spare ones there on a netCF 2. "cheat" by sticking a CPLD or something on there, and using some comms protocol from the CPU to the CPLD to do multiplexing/ demultiplexing on the daughtercard. C |