Ben,
The 3.1 firmware is great and many thanks for getting it to a practical useful stage. The DSO is a real tool now for low-freq waveforms like serial signals, automotive, audio etc. The sampling and triggering/display mode is just right.
Also of course well done to Seeedstudio for getting the idea off the ground in the first place. This is also a nice introduction to ARM.
To answer you about the SD card (for me): the revision by pjve to the version 2.5e was the first time I was able to write images etc to the SD card. He corrected some logic in the initial read of the SD info. With Ben’s 3.1 version I can write to the SD card, formatted from Win as FAT16 or 32. I can also read the card files from the DSO while connected to the PC. I have a Sandisk 2Gb.
The Calibrate function is useful and works well at 1x, but I sem to have a problem trying to calibrate for 10x. Is this my problem or is there something odd at 10x? Doesn’t matter, 1x probe is fine in this freq range.
Once again thanks to all involved.