Add STM32 DAC register definitions and skeleton DAC driver

git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@4164 42af7a65-404d-4744-a932-0658087f49c3

1 files changed, 33 insertions, 24 deletions

diff --git a/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c b/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c
index 1fbac13e7..4f9a9332c 100644
--- a/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c
+++ b/nuttx/arch/arm/src/lpc17xx/lpc17_dac.c
@@ -38,6 +38,10 @@
  *
  ************************************************************************************/
 
+/****************************************************************************
+ * Included Files
+ ****************************************************************************/
+
 #include <nuttx/config.h>
 
 #include <stdio.h>
@@ -64,11 +68,11 @@
 #if defined(CONFIG_LPC17_DAC)
 
 /****************************************************************************
- * ad_private Types
+ * Private Types
  ****************************************************************************/
 
 /****************************************************************************
- * ad_private Function Prototypes
+ * Private Function Prototypes
  ****************************************************************************/
 
 /* DAC methods */
@@ -82,7 +86,7 @@ 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
+ * Private Data
  ****************************************************************************/
 
 static const struct dac_ops_s g_dacops =
@@ -101,12 +105,13 @@ static struct dac_dev_s g_dacdev =
 };
 
 /****************************************************************************
- * ad_private Functions
+ * Private Functions
  ****************************************************************************/
 
 /* Reset the DAC device.  Called early to initialize the hardware. This
-* is called, before ao_setup() and on error conditions.
-*/
+ * is called, before ao_setup() and on error conditions.
+ */
+
 static void dac_reset(FAR struct dac_dev_s *dev)
 {
     irqstate_t flags;
@@ -114,49 +119,53 @@ static void dac_reset(FAR struct dac_dev_s *dev)
     
     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);
+    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); ?
+    //putreg32(DAC_CTRL_DBLBUFEN,LPC17_DAC_CTRL); ?
 
-	lpc17_configgpio(GPIO_AOUT);
-	
+    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.
-*/
+ * 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;
+    return OK;
 }
 
 /* Disable the DAC.  This method is called when the DAC device is closed.
-* This method reverses the operation the setup method.
-*/
+ * 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;
+    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");
@@ -184,7 +193,7 @@ static int  dac_interrupt(int irq, void *context)
 
 FAR struct dac_dev_s *up_dacinitialize()
 {
-	return &g_dacdev;
+    return &g_dacdev;
 }
 #endif