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gets() Problem

 
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Jhon_ST



Joined: 20 May 2014
Posts: 5

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gets() Problem
PostPosted: Sun Jun 01, 2014 7:38 pm     Reply with quote
hi I am trying to prepare a program controlled by a virtual terminal. Then I have a problem with the function gets (string) it blocks in the while loop. I want to know how to execute the same program if I did not write the letter R is disigne as loop interruption
Code:

while(true)
{
 gets(string);
  if(!strcmp(string,retour)){  // blocked  here
     goto start;
 }

if(a==1)
{
    output_low(pin_d0);
    output_high(pin_d1);
    s=1;
  }

if(b==1)
{

    output_high(pin_d0);
    output_low(pin_d1);

  }
   if((input(pin_a0)==1)&&((b==1)||(s==1))){
    c=5;
  output_high(pin_D2);
   delay_us(1000);
  output_low(pin_D2);
   delay_us(60);
 
   

  for(i=0;i<c;i++)
  {
 
  output_high(pin_D2);
  delay_us(60);
  output_low(pin_D2);
   delay_us(60);}
 
   }
  else
  {output_low(pin_D2);
  }

}


 
}
this is a part of program if i delete the gets(string); the program was running normally Rolling Eyes
Mike Walne



Joined: 19 Feb 2004
Posts: 1785
Location: Boston Spa UK

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PostPosted: Mon Jun 02, 2014 1:36 am     Reply with quote
Of course is sticks at gets(string).
Read the manual, it sits there waiting for a CR.

You get round the problem by polling kbhit() or use an isr.

Mike
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