dbutton.h

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/*
 *  The contents of this file are subject to the Mozilla Public License
 *  Version 1.0 (the "License"); you may not use this file except in
 *  compliance with the License. You may obtain a copy of the License
 *  at http://www.mozilla.org/MPL/
 *
 *  Software distributed under the License is distributed on an "AS IS"
 *  basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
 *  the License for the specific language governing rights and
 *  limitations under the License.
 *
 *  The Original Code is legOS code, released October 17, 1999.
 *
 *  The Initial Developer of the Original Code is Markus L. Noga.
 *  Portions created by Markus L. Noga are Copyright (C) 1999
 *  Markus L. Noga. All Rights Reserved.
 *
 *  Contributor(s): Markus L. Noga <markus@noga.de>
 */

#ifndef __dbutton_h__
#define __dbutton_h__

#ifdef  __cplusplus
extern "C" {
#endif

//
// Definitions
//

#define BUTTON_ONOFF    0x0002  
#define BUTTON_RUN      0x0004  
#define BUTTON_VIEW     0x4000  
#define BUTTON_PROGRAM  0x8000  

// buttons are active low
//

//
#define RELEASED(state,button)  ((state) & (button))

//
#define PRESSED(state,button)   (!RELEASED(state,button))

//
// Functions
//


extern inline int dbutton(void)
{
  int rv;
  __asm__ __volatile__("\n\
        mov.b @_PORT4,%0l\n\
        mov.b @_PORT7,%0h\n\
"             :"=r"(rv) // output
              :         // input
              :"cc"     // clobbered
  );

  return rv;
}

#ifdef  __cplusplus
}
#endif

#endif // __dbutton_h__

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