/*
  sdac.h - DAC124S085 SPI DAC functions declarations

  Copyright (c) 2008-2010 Micromint USA LLC
  All rights reserved.

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions
  are met:

  * Redistributions of source code must retain the above copyright
    notice, this list of conditions and the following disclaimer.
  * Redistributions in binary form must reproduce the above copyright
    notice, this list of conditions and the following disclaimer in
    the documentation and/or other materials provided with the
    distribution.
  * Neither the name of Micromint USA LLC nor the names of its
    contributors may be used to endorse or promote products derived
    from this software without specific prior written permission.

  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
  FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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  THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
  DAMAGE.
*/

#ifndef _SDAC_H
#define _SDAC_H

/* SPI port definitions */

/* Address of the SPI peripheral connected to the SPI DAC */
#define SDAC_BASE          AT91C_BASE_SPI1
/* Peripheral ID of the SPI connected to the SPI DAC */
#define SDAC_ID            AT91C_ID_SPI1
/* Chip select used for selecting SPI DAC */
#define SDAC_CS            3
/* SPI peripheral pins to configure for SPI DAC access */
#define PINS_SDAC          PINS_SPI1, PIN_SPI1_NPCS3

/* DAC definitions */

#define SDAC0              (0 << 14)
#define SDAC1              (1 << 14)
#define SDAC2              (2 << 14)
#define SDAC3              (3 << 14)

#define REG_WRITE          (0 << 12)
#define REG_WRITE_UPDATE   (1 << 12)
#define ALL_WRITE_UPDATE   (2 << 12)
#define POWER_DOWN_OUTPUT  (3 << 12)

#define SDAC_VREF          3300    /* Maximum voltage [mV] */
#define SDAC_MASK          0x0FFF  /* Resolution (12-bit) */
#define SDAC_MVOLTS(x)     ((SDAC_VREF * x) / SDAC_MASK)

/* API function declarations */
void SDAC_Initialize(void);
unsigned int SDAC_Write(unsigned int channel, unsigned int value);

#endif /* _SDAC_H */
