timeoutl.h

keil C51 Safter－Switch事例

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

   TimeoutL.H (v1.00)

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

   Simple software (loop) timeout delays for the 8051 family.

   * THESE VALUES ARE NOT PRECISE - YOU MUST ADAPT TO YOUR SYSTEM *


   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.

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

#ifndef _TIMEOUTL_H
#define _TIMEOUTL_H

// ------ Public constants -----------------------------------------
 
// Vary this value to change the loop duration
// THESE ARE APPROX VALUES FOR VARIOUS TIMEOUT DELAYS
// ON 8051, 12 MHz, 12 Osc / cycle

// *** MUST BE FINE TUNED FOR YOUR APPLICATION ***

// *** Timings vary with compiler optimisation settings ***

// tWord
#define LOOP_TIMEOUT_INIT_001ms 65435U
#define LOOP_TIMEOUT_INIT_010ms 64535U
#define LOOP_TIMEOUT_INIT_500ms 14535U
// tLong
#define LOOP_TIMEOUT_INIT_10000ms 4294795000UL

#endif

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