text: /************************************************************************************
   * arch/arm/src/lpc43xx/hardware/lpc43_dac.h
   *
   *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
   *   Author: Gregory Nutt <gnutt@nuttx.org>
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions
   * are met:
   *
   * 1. Redistributions of source code must retain the above copyright
   *    notice, this list of conditions and the following disclaimer.
   * 2. 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.
   * 3. Neither the name NuttX 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 OWNER 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, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
   * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
   * POSSIBILITY OF SUCH DAMAGE.
   *
   ************************************************************************************/
  
  #ifndef __ARCH_ARM_SRC_LPC43XX_HARDWARE_LPC43_DAC_H
  #define __ARCH_ARM_SRC_LPC43XX_HARDWARE_LPC43_DAC_H
  
  /************************************************************************************
   * Included Files
   ************************************************************************************/
  
  #include <nuttx/config.h>
  
  /************************************************************************************
   * Pre-processor Definitions
   ************************************************************************************/
  
  /* Register offsets *****************************************************************/
  
  #define LPC43_DAC_CR_OFFSET     0x0000 /* D/A Converter Register */
  #define LPC43_DAC_CTRL_OFFSET   0x0004 /* DAC Control register */
  #define LPC43_DAC_CNTVAL_OFFSET 0x0008 /* DAC Counter Value register */
  
  /* Register addresses ***************************************************************/
  
  #define LPC43_DAC_CR            (LPC43_DAC_BASE+LPC43_DAC_CR_OFFSET)
  #define LPC43_DAC_CTRL          (LPC43_DAC_BASE+LPC43_DAC_CTRL_OFFSET)
  #define LPC43_DAC_CNTVAL        (LPC43_DAC_BASE+LPC43_DAC_CNTVAL_OFFSET)
  
  /* Register bit definitions *********************************************************/
  
  /* D/A Converter Register */
                                            /* Bits 0-5: Reserved */
  #define DAC_CR_VALUE_SHIFT      (6)       /* Bits 6-15: Controls voltage on the AOUT pin */
  #define DAC_CR_VALUE_MASK       (0x3ff << DAC_CR_VALUE_SHIFT)
  #define DAC_CR_BIAS             (1 << 16) /* Bit 16: Controls DAC settling time */
                                            /* Bits 17-31: Reserved */
  /* DAC Control register */
  
  #define DAC_CTRL_INTDMAREQ      (1 << 0) /* Bit 0: Timer timed out */
  #define DAC_CTRL_DBLBUFEN       (1 << 1) /* Bit 1: Enable DACR double-buffering */
  #define DAC_CTRL_CNTEN          (1 << 2) /* Bit 2: Enable timeout counter */
  #define DAC_CTRL_DMAEN          (1 << 3) /* Bit 3: Enable DMA access */
                                           /* Bits 4-31: Reserved */
  /* DAC Counter Value register */
  
  #define DAC_CNTVAL_SHIFT        (0)      /* Bits 0-15: Reload value for DAC interrupt/DMA timer */
  #define DAC_CNTVAL_MASK         (0xffff << DAC_CNTVAL_SHIFT)
                                           /* Bits 8-31: Reserved */
  
  /************************************************************************************
   * Public Types
   ************************************************************************************/
  
  /************************************************************************************
   * Public Data
   ************************************************************************************/
  
  /************************************************************************************
   * Public Functions
   ************************************************************************************/
  
  #endif /* __ARCH_ARM_SRC_LPC43XX_HARDWARE_LPC43_DAC_H */
  