In SX Microcontrollers, SX/B Compiler and SX-Key Tool, mebikerider wrote:

[2]
I did get a minimal card logger working a while ago, but I quit after the card developed errors; possibly from my incorrectly using it as a learning device. 

But it did in fact successfully log about a half-hour of GPS data of about 80 bytes per second.

My project used discrete transistor circuits to shift 5v to 3v and used a Schmidt TTL to convert 3v out to 5v.

The program is able to distinguish between SD and MMC cards, determine the memory size of the card and write data to sectors. I used a separate Windows program to read the data from the card., so this version does not read the card.

I stopped working on this after the card read errors showed up; static RAM was for my purposes, a better match, so I continued developing my data logger in that direction.

David
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