gm1356 | read noise level from a USB-connected GM1356 Sound Level | Audio Utils library
kandi X-RAY | gm1356 Summary
kandi X-RAY | gm1356 Summary
This tool is intended to read, and print to stdout, the current sound level from a USB-connected GM1356 sound level meter. The GM1356 is not a precision instrument, but it's handy if you want to measure and monitor sound levels over a long period of time.
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QUESTION
I have a Digital Sound Level Meter (sonometer) GM1356 with USB. There is some software to handle it on Windows, however I don't have CD and it's not available on the internet. What I want do to is to read it's data about current noise level on Linux.
I found already a library that allows me to do this in a language I know (ruby, libusb). In next step I installed wireshark to check out what it sends do the pc. It doesn't send too much. The most interesting packet I found is DESCRIPTOR HID Report
. I wonder what next steps should I take to read data that is interesting for me. How can I determine what requests I should send to get it?
ANSWER
Answered 2019-May-29 at 07:57When you decode the HID descriptor it will show the packet formats. Unfortunately, in this case the usage pages are vendor-defined so it is not possible to say exactly how each usage is to be interpreted.
I decoded it using hidrdd (disclaimer: I wrote it, but it is free open source so I have no conflict of interest) as:
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