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Problem getting input from pin B4 & B5 -pic18f4550

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nicko-391

nicko-391

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Im using pic18f4550.Im checking input state of B4 & b5 in main programme. (Im using ccs)
If input are high another sub programme should run.But programme can not check the input.Whats the wrong?please help.
 

"Whats the wrong?"

Without any program source we cannot help to you!
 

void main(){

glcd_init(on);
enable_interrupts(int_ext);
setup_timer_0(RTCC_INTERNAL | RTCC_div_256);
enable_interrupts(Global);
set_timer0(0);
ext_int_edge(1);

while(1){

read_es(); // this is a sub programme

if(input(pin_b4)){

while(input(pin_b4)){
}


glcd_init(off);
glcd_init(on);
data_mode=1;
init_ext_eeprom();
last_adress=read_ext_eeprom(0x00);
data_logger(); // This is a sub programme
}
}
}


This is the main programme.My problem is whether pin B4 is high data_logger sub programme is not executed.:-(
 

From your code (commented by me):
Code: 
 if (input(pin_b4)) {           
     [COLOR="blue"]//runs only if pin_4 is equal to 1[/COLOR]

     while (input(pin_b4)) {    
     } [COLOR="red"]//but this loop is waiting until pin_4 == 0[/COLOR]

  ...
  ... [COLOR="blue"]//so your instructions here are not executed until pin_4 goes to 0[/COLOR]
  ...
 }

My recommendation:
at first write a simple program to sense the input pin state only,
and only then continue if it is already working well.
 

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