mcp23x17.h

Go to the documentation of this file.

//***************************************************************************
//
// file : bmptk/chips/mcp23x17.h
//
// LICENSE (MIT expat license, copy of license.txt)
//
// Copyright (c) 2013 Wouter van Ooijen (wouter@voti.nl)
// 
// Permission is hereby granted, free of charge, to any person obtaining
// a copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to
// permit persons to whom the Software is furnished to do so, subject to
// the following conditions:
// 
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
// IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
// CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
// TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
// SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE..
//
//***************************************************************************

// document everything in this file
namespace bmptk {
namespace chips {


        
//
template < typename interface
class mcp27x16 {  
private:

   static unsigned char port_buffer_a, port_buffer_b;
     
   static void port_flush_a(){
      channel::transaction_out_n( &port_buffer, 1 );     
   }
         
   template< int p >
   class single_pin : public bmptk::hardware::pin_out {
   public:   
   
      static void init(){
             channel::init();   
           }
          
      static void set( bool x ){
             if( x ){
                    port_buffer |= ( 0x01 << p );
         } else {
                    port_buffer &= ~ ( 0x01 << p );
         }               
                 port_flush();
          }
 
   };
   
public:
        
   static void init(){
      channel::init();
   }
   
   static int n_pins(){ 
      return 8; 
   }
   
   static void set( unsigned char x ){
      port_buffer = x;
      port_flush();
   }     
   
   typedef single_pin< 0 > pin_0;

   typedef single_pin< 1 > pin_1;

   typedef single_pin< 2 > pin_2;

   typedef single_pin< 3 > pin_3;

   typedef single_pin< 4 > pin_4;

   typedef single_pin< 5 > pin_5;

   typedef single_pin< 6 > pin_6;

   typedef single_pin< 7 > pin_7;
     
}; 

template < typename channel > 
unsigned char hc595< channel >::port_buffer;
    
}; // namespace chips
}; // namespace bmptk