ADC bugfixes plus new DAC logic from Lzyy

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3913 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 190 insertions, 0 deletions

diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c b/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c
new file mode 100644
index 000000000..1fbac13e7
--- /dev/null
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c
@@ -0,0 +1,190 @@
+/************************************************************************************
+ * arch/arm/src/lpc17xx/lpc17_dac.c
+ *
+ *   Copyright (C) 2011 Li Zhuoyi. All rights reserved.
+ *   Author: Li Zhuoyi <lzyy.cn@gmail.com>
+ *   History: 0.1 2011-08-05 initial version
+ * 
+ * This file is a part of NuttX:
+ *
+ *   Copyright (C) 2010 Gregory Nutt. All rights reserved.
+ *
+ * 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.
+ *
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <semaphore.h>
+#include <errno.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+#include <nuttx/arch.h>
+#include <nuttx/analog/dac.h>
+
+#include "up_internal.h"
+#include "up_arch.h"
+
+#include "chip.h"
+#include "lpc17_internal.h"
+#include "lpc17_syscon.h"
+#include "lpc17_pinconn.h"
+#include "lpc17_dac.h"
+
+#if defined(CONFIG_LPC17_DAC)
+
+/****************************************************************************
+ * ad_private Types
+ ****************************************************************************/
+
+/****************************************************************************
+ * ad_private Function Prototypes
+ ****************************************************************************/
+
+/* DAC methods */
+
+static void dac_reset(FAR struct dac_dev_s *dev);
+static int  dac_setup(FAR struct dac_dev_s *dev);
+static void dac_shutdown(FAR struct dac_dev_s *dev);
+static void dac_txint(FAR struct dac_dev_s *dev, bool enable);
+static int  dac_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg);
+static int  dac_ioctl(FAR struct dac_dev_s *dev, int cmd, unsigned long arg);
+static int  dac_interrupt(int irq, void *context);
+
+/****************************************************************************
+ * ad_private Data
+ ****************************************************************************/
+
+static const struct dac_ops_s g_dacops =
+{
+    .ao_reset =dac_reset,
+    .ao_setup = dac_setup,
+    .ao_shutdown = dac_shutdown,
+    .ao_txint = dac_txint,
+    .ao_send = dac_send,
+    .ao_ioctl = dac_ioctl,
+};
+
+static struct dac_dev_s g_dacdev =
+{
+    .ad_ops = &g_dacops,
+};
+
+/****************************************************************************
+ * ad_private Functions
+ ****************************************************************************/
+
+/* Reset the DAC device.  Called early to initialize the hardware. This
+* is called, before ao_setup() and on error conditions.
+*/
+static void dac_reset(FAR struct dac_dev_s *dev)
+{
+    irqstate_t flags;
+    uint32_t regval;
+    
+    flags = irqsave();
+
+	regval  = getreg32(LPC17_SYSCON_PCLKSEL0);
+	regval &= ~SYSCON_PCLKSEL0_DAC_MASK;
+	regval |= (SYSCON_PCLKSEL_CCLK8 << SYSCON_PCLKSEL0_DAC_SHIFT);
+	putreg32(regval, LPC17_SYSCON_PCLKSEL0);
+
+	//putreg32(DAC_CTRL_DBLBUFEN,LPC17_DAC_CTRL); ?
+
+	lpc17_configgpio(GPIO_AOUT);
+	
+    irqrestore(flags);
+
+}
+
+/* Configure the DAC. This method is called the first time that the DAC
+* device is opened.  This will occur when the port is first opened.
+* This setup includes configuring and attaching DAC interrupts.  Interrupts
+* are all disabled upon return.
+*/
+static int  dac_setup(FAR struct dac_dev_s *dev)
+{
+	return OK;
+}
+
+/* Disable the DAC.  This method is called when the DAC device is closed.
+* This method reverses the operation the setup method.
+*/
+static void dac_shutdown(FAR struct dac_dev_s *dev)
+{
+}
+
+/* Call to enable or disable TX interrupts */
+static void dac_txint(FAR struct dac_dev_s *dev, bool enable)
+{
+}
+
+static int  dac_send(FAR struct dac_dev_s *dev, FAR struct dac_msg_s *msg)
+{
+	putreg32((msg->am_data>>16)&0xfffff,LPC17_DAC_CR);
+	dac_txdone(&g_dacdev);
+	return 0;
+}
+
+/* All ioctl calls will be routed through this method */
+static int  dac_ioctl(FAR struct dac_dev_s *dev, int cmd, unsigned long arg)
+{
+    dbg("Fix me:Not Implemented\n");
+    return 0;
+}
+
+static int  dac_interrupt(int irq, void *context)
+{
+}
+
+/****************************************************************************
+ * Public Functions
+ ****************************************************************************/
+
+/****************************************************************************
+ * Name: up_dacinitialize
+ *
+ * Description:
+ *   Initialize the DAC
+ *
+ * Returned Value:
+ *   Valid dac device structure reference on succcess; a NULL on failure
+ *
+ ****************************************************************************/
+
+FAR struct dac_dev_s *up_dacinitialize()
+{
+	return &g_dacdev;
+}
+#endif
+