stm32f429i-disco: implements lcd initializing

This enables the initializing of the lcd device connected on the
stm32f429i-disco. The following methods are provided:
- up_lcdinitialize
- up_lcduninitialize
- up_lcdgetdev

The corresponding ili9341 lcd device in the nuttx driver section can be
configured by Kconfig. Interface 0 is used by default.

Signed-off-by: Marco Krahl <ocram.lhark@gmail.com>

configs/stm32f429i-disco/src/stm32_lcd.c

@@ -0,0 +1,169 @@
+/************************************************************************************
+ * configs/stm32f429i-disco/src/stm32_lcd.c
+ *
+ *   Copyright (C) 2014 Marco Krahl. All rights reserved.
+ *   Author: Marco Krahl <ocram.lhark@gmail.com>
+ *
+ * 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.
+ *
+ ************************************************************************************/
+
+/************************************************************************************
+ * Included Files
+ ************************************************************************************/
+
+#include <nuttx/config.h>
+
+#include <errno.h>
+#include <debug.h>
+
+#include <arch/board/board.h>
+
+#include "up_arch.h"
+#include "stm32f429i-disco.h"
+
+/************************************************************************************
+ * Definitions
+ ************************************************************************************/
+#ifdef CONFIG_STM32F429I_DISCO_ILI9341_LCDDEVICE
+# define ILI9341_LCD_DEVICE CONFIG_STM32F429I_DISCO_ILI9341_LCDDEVICE
+#else
+# define ILI9341_LCD_DEVICE  0
+#endif
+/******************************************************************************
+ * Private Data
+ ******************************************************************************/
+
+FAR struct lcd_dev_s *g_lcd = NULL;
+
+/************************************************************************************
+ * Private Functions
+ ************************************************************************************/
+
+/************************************************************************************
+ * Public Functions
+ ************************************************************************************/
+
+#ifdef CONFIG_STM32F429I_DISCO_ILI9341_LCDIFACE
+/****************************************************************************
+ * Name: up_lcduninitialize
+ *
+ * Description:
+ *   Unitialize the LCD Device.
+ *
+ * Parameter:
+ *
+ * Return:
+ *
+ ***************************************************************************/
+
+void up_lcduninitialize(void)
+{
+  /* Set display off */
+
+  g_lcd->setpower(g_lcd, 0);
+
+  g_lcd = NULL;
+}
+
+
+/****************************************************************************
+ * Name: up_lcdgetdev
+ *
+ * Description:
+ *   Return a reference to the LCD object for the specified LCD Device.
+ *   This allows support for multiple LCD devices.
+ *
+ * Parameter:
+ *   lcddev - Number of the LDC Device.
+ *
+ * Return:
+ *   Reference to the LCD object if exist otherwise NULL
+ *
+ ***************************************************************************/
+
+FAR struct lcd_dev_s *up_lcdgetdev(int lcddev)
+{
+  if (lcddev == ILI9341_LCD_DEVICE)
+    {
+      return g_lcd;
+    }
+
+  return NULL;
+}
+
+
+/****************************************************************************
+ * Name: up_lcdinitialize
+ *
+ * Description:
+ *   Initialize the LCD video hardware. The initial state of the LCD is
+ *   fully initialized, display memory cleared, and the LCD ready to use, but
+ *   with the power setting at 0 (full off).
+ *
+ * Parameter:
+ *
+ * Return:
+ *   On success - Ok
+ *   On error   - Error Code
+ *
+ ****************************************************************************/
+
+int up_lcdinitialize(void)
+{
+  /* check if always initialized */
+
+  if (!g_lcd)
+    {
+      /* Initialize the sub driver structure */
+
+      FAR struct ili9341_lcd_s *dev = stm32_ili93414ws_initialize();
+
+      /* Initialize public lcd driver structure */
+
+      if (dev)
+        {
+          /*
+           * Get a reference to valid lcd driver structure to avoid repeated
+           * initialization of the LCD Device. Also enables uninitializing of
+           * the LCD Device.
+           */
+
+          g_lcd = ili9341_initialize(dev, ILI9341_LCD_DEVICE);
+
+          if (g_lcd)
+            {
+              return OK;
+            }
+        }
+    }
+
+  return -errno;
+}
+
+#endif