/*
 * pga23xx.h: burr brown volume control chip (spi based)
 *
 *
 *  (part of the "VoluMaster(tm)" system)
 *
 *  An open-source arduino controller-based digital volume control and input/output selector
 *
 *
 *  LICENSE
 *  -------
 *  This program is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *  
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *  
 *  You should have received a copy of the GNU General Public License
 *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
 *
 */


#ifndef PGA23XX_H
#define PGA23XX_H


#include <inttypes.h>


#include "config.h"



#ifdef USE_PGA_SPI
#define PGA_CS_PIN                   12  // (my orange wire)
#define PGA_SDATA_PIN                11  // (my yellow wire)
#define PGA_SCK_PIN                  10  // (my green wire)
#endif





#ifdef USE_PGA_I2C

// You will have to change the address for the PCF8574A to B0111000
// (with all three address pins tied to ground). The Wire library will
// take care of the last bit (the R/W) so make sure you leave that
//  out of the address.  Note that the R/W bit is not part of this address.

#define I2C_PGA_PE_ADDR     B0111111 // PCF8574A  with three address pins tied to Vcc!
//#define I2C_PGA_PE_ADDR   B0100000  // Address with three address pins grounded.

#define PGA_I2C_CS          B10000000
#define PGA_I2C_SDATA       B00100000
#define PGA_I2C_SCK         B00010000

#define PGA_I2C_CS_LOW      B00000000
#define PGA_I2C_CS_HI       B10000000

#define PGA_I2C_SDATA_LOW   B00000000
#define PGA_I2C_SDATA_HI    B00100000

#define PGA_I2C_SCK_LOW     B00000000
#define PGA_I2C_SCK_HI      B00010000

#endif //  USE_PGA




class PGA23XX {

 public:

  PGA23XX( void );
  void init( void );
  void map_pga_value_to_db( uint8_t pga_int_value, uint8_t *db_value, uint8_t *negative_db, uint8_t *half_db_flag );
  void set_volume( uint8_t left, uint8_t right );
  void SPI_write( uint8_t out_spi_byte );
  uint8_t PCF8574_PE_read( void );
  void PCF8574_PE_write( uint8_t _data );
};





#endif // PGA23XX_H