Maybe someone has encountered the same problem.
Speedybee f405 wing with MS4525DO airspeed sensor connected to i2c.
The sensor produces a sawtooth curve in MP tune param, in glasses it also blinking like that - - - then the speed.
This is happening just after ARM, when disarm the speed is normal.
Yeap, I have exactly the same problem as you.
Have you found the solution?
BTW, i am also using Speedybee f405 wing.
I tried airspeed sensor from 2 manufactures, same results.
I tried different firmware versions, arduplane_4.4.4, 4.5.3, 4.6.4, same results.
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OK, I was in contact with the manufacture. And it turns out to be caused by the sd card. If you change to a high speed sd card, the issue will go away.
You will need a C10 class sd card, the max memory supported is 16G.
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Actually, what I found is some parameter make this mess, if you connected your airspeed sensor to fresh flashed board everything is fine. I changed few times the CD and everything is the same.