Reading SD-cards on Arduino

Seel Adafruit’s tutorial. Also consider BMP files.

Looking around it seems it takes 12msec to do a 512B block read.

Maximum latency: 12697 usec, Minimum Latency: 7495 usec, Avg Latency: 7576 usec

This post claims it takes 1msec.

That’s quite different. If it’s 1msec, it means I can read the SD-card while drawing pixels. Otherwise it means I can’t and I need to wait for the refresh, which limits the display to the amount of memory available… I’ll have to experiment!


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