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i did a code it's working but there's flickering inthe characters displayed i don't know why could you help me
plus i would like to be sure about the timing i'm using
reset timing?
time between each command sent?
i used a big delay to be on the safe side but i want to have more accurate values

I don't have the exact timing here but if you look into the KS0108 datasheet it has the timing diagrams where you can look the timing requirements.