timeouth.h

调度器与SPI接口完美的结合,一种崭新的编程思路

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

   TimeoutH.H (v1.00)

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

   Simple timeout delays for the 8051 family based on T0/T1.

   Timer must be correctly configured to use these values:
   See Chapter 15 for details.


   COPYRIGHT
   ---------

   This code is from the book:

   PATTERNS FOR TIME-TRIGGERED EMBEDDED SYSTEMS by Michael J. Pont 
   [Pearson Education, 2001; ISBN: 0-201-33138-1].

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

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

// ------ Public constants -----------------------------------------
 
// Timer T_ values for use in simple (hardware) timeouts
// - Timers are 16-bit, manual reload ('one shot').
//
// NOTE: These macros are portable but timings are *approximate*
//       and *must* be checked by hand if accurate timing is required.
//
// Define initial Timer 0 / Timer 1 values for ~50 祍 delay
#define T_50micros (65536 - (tWord)((OSC_FREQ / 26000)/(OSC_PER_INST)))    
#define T_50micros_H (T_50micros / 256)
#define T_50micros_L (T_50micros % 256)

// Define initial Timer 0 / Timer 1 values for ~500 祍 delay
#define T_500micros (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 2000)))    
#define T_500micros_H (T_500micros / 256)
#define T_500micros_L (T_500micros % 256)

// Define initial Timer 0 / Timer 1 values for ~1 msec delay
#define T_01ms (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 1000)))    
#define T_01ms_H (T_01ms / 256)
#define T_01ms_L (T_01ms % 256)
//
// Define initial Timer 0 / Timer 1 values for ~5 msec delay
#define T_05ms  (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 200)))    
#define T_05ms_H (T_05ms / 256)
#define T_05ms_L  (T_05ms % 256)
//
// Define initial Timer 0 / Timer 1 values for ~10 msec delay
#define T_10ms  (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 100)))    
#define T_10ms_H (T_10ms / 256)
#define T_10ms_L  (T_10ms % 256)
//
// Define initial Timer 0 / Timer 1 values for ~15 msec delay
#define T_15ms  (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 67)))    
#define T_15ms_H (T_15ms / 256)
#define T_15ms_L  (T_15ms % 256)
//
// Define initial Timer 0 / Timer 1 values for ~20 msec delay
#define T_20ms  (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 50)))    
#define T_20ms_H (T_20ms / 256)
#define T_20ms_L  (T_20ms % 256)
//
// Define initial Timer 0 / Timer 1 values for ~50 msec delay
#define T_50ms  (65536 - (tWord)(OSC_FREQ / (OSC_PER_INST * 20)))    
#define T_50ms_H (T_50ms / 256)
#define T_50ms_L (T_50ms % 256)

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