I just got the DSO nano (by the way, very nice project!), but I almost immediately went into a couple of issues:
first, apparently the device doesn’t work as usb storage, both under windows XP and linux. I followed all your instructions on getting the sd card working, but I had to use an external usb reader to do it. when I connect the DSO to a computer with an USB cable, I get errors: XP asks to format the device, while linux gives read errors and doesn’t recognize the partition. in both cases if I reformat/repartition the card, using fat16 and putting the necessary files on it, I obtain an “SD card err” on the dso.
this is not a great issue, just I have to remove the card to access it, but it would be nice to use the DSO as external storage: just added value to the product!
a more substantial issue comes from the battery: I connected it, fully charged and then discharged to test duration (something between 2 and 3 hours), then charged it again. the problem is the following:
the battery icon after the device is turned on shows immediately “battery low” (yellow)
if the device is left off for a long time (hours, but I have to test to get a more precise value), then it will turn on only if connected to an usb cable. when the cable is connected the device turns on immediately and stays on for a long time even if the cable is removed, so it is not just a battery problem
I hope these problems con be fixed with a firmware upgrade, anyway thanks in advance!