dpswtch4.c

TQ公司的STK16x开发系统的源码

/* File: DPSWTCH4.C */

/****************************************************************************
* 
* STK16X.DPSWTCH4
* ===============
*
* Low level routines for reading DIP switch state (digital input)
*
* TQ-Systems GmbH
* ----------------                                                         
* Customer: TQ-Components
* Project : STK16XSW
* Tools   : uVision 2.05
*
* Rev: Date:     Name:            Modification:
* ----+---------+----------------+------------------------------------------
* 100  19.01.01  A. Lichte       taken over from STK16X.506                
*****************************************************************************/

/****************************************************************************
*
*                            availability summary
*
* available for Starterkit: STK16X STK16XU
* conformed for Starterkit: STK16X STK16XU 
* available for Modul     : TQM164   TQM165   TQM165U  TQM166  TQM167
*                           TQM167UL TQM167U  TQM167LC
*                           
* conformed for Modul     : TQM164   TQM165   TQM165U  TQM166  TQM167
*                           TQM167UL TQM167U  TQM167LC
*****************************************************************************/


/*==========================================================================*
* include files (#INCLUDE):
*===========================================================================*/

/*--------------------------------------------------------------------------*
* standard include files: 
*---------------------------------------------------------------------------*/
#include <reg167.h>             /* special function register              */

/*--------------------------------------------------------------------------*
* project specific include files:
*---------------------------------------------------------------------------*/
#include "dpswtch4.h"           /* DIP switch functions                   */

/*==========================================================================*
* module internal definitions (#DEFINE):
*===========================================================================*/

/*==========================================================================*
* module internal type declarations (TYPEDEF):
*===========================================================================*/

/*==========================================================================*
* module internal constants (CONST):
*===========================================================================*/

/*==========================================================================*
* extern available constants (CONST):
*===========================================================================*/

/*==========================================================================*
* modul internal variables:
*===========================================================================*/

/*--------------------------------------------------------------------------*
* SWITCH control lines:
*---------------------------------------------------------------------------*/
sbit sw_1      = SW_1;
sbit sw_1_dir  = SW_1_DIR;
sbit sw_2      = SW_2;
sbit sw_2_dir  = SW_2_DIR;
sbit sw_3      = SW_3;
sbit sw_3_dir  = SW_3_DIR;
sbit sw_4      = SW_4;
sbit sw_4_dir  = SW_4_DIR;

/*==========================================================================*
* globale external available variables (EXTERN):
*===========================================================================*/

/*==========================================================================*
* modul internal functions:
*===========================================================================*/

/*--------------------------------------------------------------------------*
* void dpswtch4_init()
*---------------------------------------------------------------------------*
* FT: init port 2 for reading DIP switch
* EP: -                                                        
* RW: -
* GP: SW_DIR_IN, sw_1_dir, sw_2_dir, sw_3_dir ,sw_4_dir
*---------------------------------------------------------------------------*/
void dpswtch4_init()
{
  /* set port pins as inputs for reading DIP switch: */
  sw_1_dir = SW_DIR_IN;
  sw_2_dir = SW_DIR_IN;
  sw_3_dir = SW_DIR_IN;
  sw_4_dir = SW_DIR_IN;
}

/*--------------------------------------------------------------------------*
* BYTE dpswtch4_read()
*---------------------------------------------------------------------------*
* FT: read state of DIP switch
* EP: -                                                        
* RW: state of DIP switch: SWITCH 1 = Bit 0
*                          SWITCH 2 = Bit 1
*                          SWITCH 3 = Bit 2
*                          SWITCH 4 0 Bit 3
* GP: sw_1, sw_2, sw_3, sw_4
*---------------------------------------------------------------------------*/
BYTE dpswtch4_read()
{ BYTE state;

  state = 0x00 | sw_4;               /* save state of SWITCH 4 */
  state = (state << 1) | sw_3;       /* save state of SWITCH 3 */
  state = (state << 1) | sw_2;       /* save state of SWITCH 2 */
  state = (state << 1) | sw_1;       /* save state of SWITCH 1 */

  return(state);
}