Using uMMC to connect basic stamp with SD memory cards.
I bought the uMMC·http://www.roguerobotics.com/products/electronics/ummc·and I am trying to get it to work with no luck.· This is probably because I am new to SERIN and SEROUT commands and am messing something up.· If anybody has used this and could post sample basic stamp code to read and write files that would be great.·
This device is supposed to allow basic stamps access to SD cards or MMC cards for tons of storage space.
This device is supposed to allow basic stamps access to SD cards or MMC cards for tons of storage space.
Comments
The Rogue uMMC is not very Stamp friendly. It returns many of its responses too fast for the Stamp to catch them, so it is no wonder that you were having problems with the SERIN and SEROUT. The Stamp takes about a millisecond to get ready to receive data after it has sent a command, but the uMMC responds in a few 10s of microseconds. That said, it is possible to use the uMMC, but you can't count on the error codes or handshakes. The program is "open loop".
If you want an SD card interface that is much more Stamp friendly, look at the product from Hitt Consulting:
www.sddatalogger.com
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Tracy Allen
www.emesystems.com