well i thought OE might be the problem but the datasheet said that OE is high only for giving output so i thought it might be for buffer only as enable signal, besides many people who have used this chip for continuous conversion have kept OE always high and didn't seem to have any problem for them(also if we look at the working of code on hardware what i saw was no output was given, and i made the program so that even if there is any value the controller should give some leds ON on the 1x7 column, and i didnt get any output meaning the program isnt going out of the eoc loop, which is what the big problem is)