Latching comparator with negative inputs

[Freddybaby]

Trying to get this to work. I need a comparator for 0 to -2V in, and it needs to latch at the threshold. Using an LM358, dual +/- 5V supply. I keep lowering the feedback R till it forces a latch but it won't work..

Any ideas or should I invert first and work with a more predictable method ?

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[pauloynski]

Could you upload your circuit, please?