View Full Version : MMC cards?

05-19-2006, 02:53 PM
I am trying to find more storage for a rocket payload and came across this MMC/SD data storage adapter from Roge Robotics. And was courious if anybody else has done anything with this device or one simular? What consederations need to be taken when connecting to a Stamp?


Post Edited (Mike15) : 5/19/2006 9:56:40 AM GMT

Scott Knauert
05-23-2006, 02:43 AM
You can make a 4 pin MMC/SD adapter using GPIOs. I know because the OpenWRT Linux distro has a driver for the WRT54G/GS series of Linksys routers and I've modified my hardware to take it, so everything works. I don't know anybody who has done something similar for a Stamp. You could in theory look at the driver code in mmc.c (check the OpenWRT wiki) to see how you might implement this as controlling a Stamps pins in basic should be as easy, if not easier, than controlling the Broadcom's gpio under Linux. Assuming there isn't a hardware requirement due to timings, it should have the interface code required.

Also, how much data are you going to need? If it's under 1MB, you probably want a Serial EEPROM. Here is a good guide (that I've followed) to interfacing with a BS2: http://geocities.com/SiliconValley/Orchard/6633/EEPROM.html I'm sure there are Serial EEPROM info in StampWorks and elsewhere from Parallax. Serial EEPROMs are also smaller than an MMC/SD.