Thanks for the feedback! Mostly positive I would say and obviously some of you appreciate the differences.
As for making the modified source public – I think the best option would be a single source with some type of managed/official maintenance (possibly by Seedstudio). I’m not sure however what ambitions Seedstudio have on the software/firmware side so I will keep the source private for now.
As for using SD cards - the “No File” error suggests that the SD card works. You need to pre-create all files however as the DSO firmware lacks the functionality to maintain the SD card file system. The only capability is to update file content, not to create new files. Also filenames must be all uppercase plus digits and the file must have the right size.
I’m not sure how to follow up on the input from “jordana”. A 400 kHz signal is approaching the hardware limit of the scope (bandwidth wise) and this may be part of the issue. If you have some specific instructions on how to trigger an issue, I may look further into this.
Comments from dnorderberg suggest he doesn’t quite understand how to use the firmware yet. You may want to re-read the brief instructions I posted and try again. You may also like to know that it has been tested extensively with a large range of signal sources with no issues found. When “Freq” is displayed (rather than a value) it is because no value can be calculated from the signal source (e.g. no trigger).
Also I have some news for all of you.
I have rewritten the library part of the firmware from scratch and added support for a mountable file system. That is, the DSO will now show up as a removable drive when connected to a host computer through USB. Files can then be read / written using the host computer without having to remove the SD card from the DSO nano. For me, this was the final “must have” issue. I will post the update shortly.