keyp_232.c

外国人写的调度器

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

   Keyp_232.C (v1.00)

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

   Simple demonstration function for transferring keypad inputs to
   PC via serial (RS232) link. 


   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.

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

#include "Main.h"
#include "Keypad.h"
#include "Keyp_232.h"
#include "PC_O.h"

// ------ Private variables ----------------------------------------

tByte Count_G;

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

  Keypad_RS232_Init()

  Init function for simple library displaying keypad inputs
  over serial link.

-*------------------------------------------------------------------*/
void Keypad_RS232_Init(void)
   {
   PC_LINK_O_Write_String_To_Buffer("Keypad test code - READY\n");

   Count_G = 0;
   
   KEYPAD_Clear_Buffer();
   }


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

  Keypad_RS232_Update()

  Function for displaying keypad inputs over serial link.

-*------------------------------------------------------------------*/
void Keypad_RS232_Update(void)     
   {
   char Key, FnKey;

   // Update the keypad buffer
   KEYPAD_Update();
   
   // Is there any new data in the keypad buffer?
   if (KEYPAD_Get_Data_From_Buffer(&Key, &FnKey) == 0)
      {
      // No new data.
      return;
      }

   // Function key has been pressed (with another key)
   if (FnKey)
      {
      PC_LINK_O_Write_Char_To_Buffer('\n');
      PC_LINK_O_Write_Char_To_Buffer(FnKey);
      PC_LINK_O_Write_Char_To_Buffer(Key);
      PC_LINK_O_Write_Char_To_Buffer('\n');

      Count_G = 0;
      }
   else
      {
      // An ordinary key (no function key) has been pressed
      PC_LINK_O_Write_Char_To_Buffer(Key);
      
      if (++Count_G == 10) 
         {
         PC_LINK_O_Write_Char_To_Buffer('\n');
         Count_G = 0;
         }
      }
   }

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