Do it like this:
void main(void)
{
  CMCON=7;          // I am assuming this is correct, did not verify
  TRISA=0;              // set port A, bit 0 to output
  TRISB=255;          // set all port B to input

  a=150;                  // initialize delay time
  PORTA=0;           // turn off output bit to start

  while(B0!=1);          // this statement hangs waiting on hardware to 
force B0 on.

  while(1)                  // 1 will always evaluate to 1. therefore you 
cannot get out of this while loop  with software
  {
     PORTA=1;         // output a bit
     delay();               // wait on time
     PORTA=255;    // output all bits in Port A if the default for PORTA is 
output
     delay();               // wait on time

   }     // end while(1)

}       //end main

I am assuming the // initiates a comment in your compiler.
I cannot see any reason for the software to allow you out of the while(1) 
loop.
I did not examine the rest of the code.
I admit to being an extremist on comments. An uncommented line is an 
opportunity lost.

If you are serious about the problem, take a herd look at ALL of the 
suggestions and the PIC Collective will eventually solve the problem.
If you are a Troll, it is your move....

John Ferrell
http://DixieNC.US


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