delay_loop.c

keil C51 Hello2事例

/*------------------------------------------------------------------*-

   Delay_Loop.C (v1.00)

  ------------------------------------------------------------------

   Create a simple software delay using a loop. 
 

   COPYRIGHT
   ---------

   This code is associated with the book:

   EMBEDDED C by Michael J. Pont 
   [Pearson Education, 2002: ISBN: 0-201-79523-X].

   This code is copyright (c) 2001 by Michael J. Pont.
 
   See book for copyright details and other information.
 
-*------------------------------------------------------------------*/

#include "Main.H"
#include "Port.H"

#include "Delay_loop.h"

/*------------------------------------------------------------------*-

  DELAY_LOOP_Wait()

  Delay duration varies with parameter.  

  Parameter is, *ROUGHLY*, the delay, in milliseconds,
  on 12MHz 8051 (12 osc cycles).

  You need to adjust the timing for your application!

-*------------------------------------------------------------------*/
void DELAY_LOOP_Wait(const tWord DELAY_MS)
   {
   tWord x, y;

   for (x = 0; x <= DELAY_MS; x++)
      {
      for (y = 0; y <= 1200; y++);
      }
   }

/*------------------------------------------------------------------*-
  ---- END OF FILE -------------------------------------------------
-*------------------------------------------------------------------*/