LPC2138---interfacing keypad +lcd

i faced problem that without pressing any switch from keypad it shows '1'..at starting
and after that it don't show anything if i press keys..
i post my code+proteus simulation just see,...n help me fast

First thing, you need to check your key logic as it should not detect any key... secondly

while(key_pressed())

This line will exit the main function so you wont be able to detect any key later on.. so have another while(1) loop outside the key_pressed checking loop.

[Topic moved to ARM Development Forum]

i add while loop even though same problem is going on...What u said about while(key_pressed()) ..i cant understood it..can u make change in my programm and attach it here..i shall be very thankful to you

thanx for help..........i changed my whole program and add some pull up register and i done it...thnx...

good job congrats.. this was the modification I suggested.

while (1) {
    while(key_pressed()) {
        //rest of the program...
    }
} //this is extra while loop preventing program to exit.