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Current sensing with inverting amplifier

Question asked by zhu.tym on Sep 15, 2016
I have been trying to use FOC SDK 4.2 with existing hardware. The board uses inverting amplifier instead of non-inverting ones. Anyone got an idea on how to modify the code?
So far I've tried:
1. use negative value for amplifier gain:  doesn't work
2. use negative value for current shunt:   doesn't work
3. use negative gains for the current loops:  stable current loop, but will trigger "speed feedback" fault.