Simplify HMC5883 dirver

[digitalentity]

PoC implementation 9b02f455c7bf54c69f232c3b008bdc9f7664e4fa by @andrejpodzimek.

I've done some tests and it looks like magGain calculated in HMC5883 driver is between 0.8 and 1.0. Not applying per-axis gains may result in non-linearity of heading. In worst case it may lead to heading error of about 6 degrees which is probably acceptable - compass alignment error is likely to be bigger.

References: #2619 (comment), #2558, #2299

[stronnag]

Flight tested on 0d51ca3 + #2809 as diff + QUARKVISION target files, (QVF4). Beitian BN880 (M8N/5883).
Works just fine. Probably not distinguishable from prior driver.

[giacomo892]

Flown the same on OMNIBUS F3. All perfect.
To be noted that 0d51ca3 isn't going to impact MR but FW without BARO. But should cause no issues.

[stronnag]

It doesn't (affect MR), not even a placebo "AH was fantasic!!!!" (which it was, as usual). Just happened to be dev HEAD.

[giacomo892]

@stronnag eheheh. I'm still struggling to get a perfect altitude holding :) But that's another matter. I would like if you post a video of a your machine where it holds altitude for a minute in PH/AH mode :) So I can compare to mine. Thanks!

[stronnag]

@giacomo892 Sure. Videos are NOT my forte, but I'll try and remember next time.

[digitalentity]

Good!

[alanfj]

I just tried the latest INAV Beta 1.9 on my OmnibusF4SD using the OmnibusF4PRO target and the “compass” still does not work. I have 2 of these Radiolink SE100’s, that I bought new in January ’18, and even reversed the polarity and still get nothing. Went into CLI and made sure it was set manually to QMC5883. The “GPS” functions properly. In AUTO it is still recognized as the HMC5883.

[dleask]

I’ve ended up returning the unit I bought as the stated HMC5833L chip is clearly a clone/copy. Manually setting the QMC5833 doesn’t show a magnetometer is detected. Looking inside the unit, it appears the mag chip has been painted over to stop visual identification.

[ghost]

@dleask
Who did you buy your SE100 from?
From my own personnel experience and the numerous problems reported in various forums about this product, it appears that Radio Link are up to all sorts of Chinese smoke and mirror tricks in an attempt to cover up a major design/production screw up.
I bought mine from BG and I am going to recommend that they discontinue this product, and preferably, all other products from this company.

[alanfj]

My (2) Radiolink SE100's were purchased from Banggood. They each have the DA5883 mag chip in them. Still hoping I can eventually use them. I'll keep my fingers crossed that it all gets worked out. digitalentity is a smart fellow and so are his associates. :)

[kingdraki]

Same here, SE100 from Banggood with DA5883. Does not work as HMC5883, as which it is detected. And does not work as QMC5883. Inav sets Mag label in the upper bar red then.

[dleask]

Mine was from a UK eBay seller, there seems to be a lot with the same description containing a reference to HMC5833L magnetometer.

This is the new Ublox Neo-M8N GPS module that includes a HMC5883L digital compass. This module has a high level of sensitivity and features active circuitry for the ceramic patch antenna. It also comes enclosed in plastic case to protect the module from the elements. This modules outputs precise position updates at 10Hz and also has a rechargeable backup battery for warm starts. The Ublox NEO-M8N is configured to run at a baud rate of 38400 and ships for use with Pixhawk and APM (you might need to modify the cable to fit your autopilot board).

[alanfj]

Not working on target OmnibusF4PRO. digitalentity is making the fix for INAV 1.90 RC2

[kingdraki]

Ok, just saw #2299 . I have also OmnibusF4 pro.

[alanfj]

digitalentity has made the fix with the release today of INAV 1.90 RC2. I tried it and it works exceedingly well. The Radiolink SE100 works fantastically! Thanks digitalentity!