NHS3100 data storage capacity

martinsmarco — Tue, 28 Nov 2017 11:14:19 GMT

Dear Support

How can I confirm/change the Total storage capacity of the NHS3100 (demo.tlogger firmware)

Also, I can we access the Logging data without using the android app?

Thanks

Re: NHS3100 data storage capacity

driesmoors — Tue, 28 Nov 2017 13:23:36 GMT

Hi,

That's not so easy to answer. For more background information see the PDF docs/DataStorage.pdf inside the SDK.

Summarized: the total capacity is dependent on:

Your firmware size: more Flash space occupied by your firmware == less space left for data storage.
Your compression algorithm running in firmware:
the algorithm itself takes space, but delivers a certain compression ratio, tailored for your use case;
plus the compression will likely yield different results given different inputs. This may result in a slightly different storage capacity.
Your resolution: how many bits per sample do you need to store for your use case?

The data is not directly accessible from the NFC interface: you will need some logic running on the tag reader side to at minimum repeatedly read the memory of the NFC interface. Either you take the command- response approach - as is done in the Android APP; or you adapt the firmware to automatically update the memory of the NFC interface in firmware - an approach necessary for readout via iOS.

Apart from Android and iOS, you can also use an NFC USB dongle, and run a Python script or anything else on a PC (Windows, macOS, Linux).

Practically: changing the storage capacity using the demo firmware supplied in the SDK is very quickly done using the diversity settings in app_sel.h in the project app_demo_dp_tlogger: e.g. comment out the defines STORAGE_COMPRESS_CB and STORAGE_DECOMPRESS_CB to disable compression; that will most certainly have an effect.

Is there a specific feature or setup you had in mind?

Best,
Dries.

NFCのトピックNHS3100 data storage capacity

NHS3100 data storage capacity

Re: NHS3100 data storage capacity