Add DAC header file

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@2707 42af7a65-404d-4744-a932-0658087f49c3

arch/arm/src/lpc17xx/lpc17_dac.h

@@ -0,0 +1,97 @@
+/************************************************************************************
+ * arch/arm/src/lpc17xx/lpc17_dac.h
+ *
+ *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
+ *   Author: Gregory Nutt <spudmonkey@racsa.co.cr>
+ *
+ * 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_LPC17XX_LPC17_DAC_H
+#define __ARCH_ARM_SRC_LPC17XX_LPC17_DAC_H
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include "chip.h"
+#include "lp17_memorymap.h"
+
+/************************************************************************************
+ * Pre-processor Definitions
+ ************************************************************************************/
+
+/* Register offsets *****************************************************************/
+
+#define LPC17_DAC_CR_OFFSET     0x0000 /* D/A Converter Register */
+#define LPC17_DAC_CTRL_OFFSET   0x0004 /* DAC Control register */
+#define LPC17_DAC_CNTVAL_OFFSET 0x0008 /* DAC Counter Value register */
+
+/* Register addresses ***************************************************************/
+
+#define LPC17_DAC_CR            (LPC17_DAC_BASE+LPC17_DAC_CR_OFFSET)
+#define LPC17_DAC_CTRL          (LPC17_DAC_BASE+LPC17_DAC_CTRL_OFFSET)
+#define LPC17_DAC_CNTVAL        (LPC17_DAC_BASE+LPC17_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_LPC17XX_LPC17_DAC_H */