need help with the code in c language

[jakshay]

hello..
I am working a car parking monitor system.....i am using simple ir led receiver and a comparator lm 324 connected to 89s52..

i am making six slots interfacing to micro controller 89s52.
the input pins are 2.0 to 2.6 and output pins are port connected to LCD (jhd 162a 16*2)

i want a program logic for the following

case1:when all parking slots are empty
LCD should display " vacant slots:b1,b2,b3,b4,b5,b6

case2: now a car gets parked in slot b1 (for example)
LCD output should be
empty slots :b2,b3,b4, b5,b6 (exclude b1)

case 3: say the parking slot b1 gets vacant again
b1 should again come in the list..

output on LCD , of empty slots=b1,b2,b3,b4,b5,b6

thanks in advance

 

[Kurenai_ryu]

firstly, make sure your hardware is ok,
(make a small blink program) then your LCD is ok, (try a Hello world program)

I'm assuming that when an Input is low, it means it's free, when it's high it means that it's occupied,

//add your hardware, and lcd routines here...
void main(void){
 lcd_init(); //init your lcd,
 P2=0x7F; //0 to 5 as inputs.

 while(1){
  lcd_clear(); //or command 0x01 followed by a 2ms delay
 lcd_print("VACANT SLOTS");
 lcd_cmd(0xC0); //or lcd_goto line 2
 if(P2.0) lcd_print("--");
 else lcd_print("b1");
 if(P2.1) lcd_print("--");
 else lcd_print("b2");
 if(P2.2) lcd_print("--");
 else lcd_print("b3");
 if(P2.3) lcd_print("--");
 else lcd_print("b4");
 if(P2.4) lcd_print("--");
 else lcd_print("b5");
 if(P2.5) lcd_print("--");
 else lcd_print("b6");
 delay_ms(1000); //needs some delay have a delay routine, some where...
 }
}

if you don't have LCD routines, go search!!! there are plenty, I have put mine in this forum also! do some work!