text: /****************************************************************************
   * boards/arm/stm32/stm3220g-eval/src/stm32_lcd.c
   *
   *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
   *   Authors: Gregory Nutt <gnutt@nuttx.org>
   *            Diego Sanchez <dsanchez@nx-engineering.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.
   *
   ****************************************************************************/
  
  /* This driver supports the following LCDs on the STM324xG_EVAL board:
   *
   *   AM-240320L8TNQW00H (LCD_ILI9320 or LCD_ILI9321) OR
   *   AM-240320D5TOQW01H (LCD_ILI9325)
   */
  
  /****************************************************************************
   * Included Files
   ****************************************************************************/
  
  #include <nuttx/config.h>
  
  #include <sys/types.h>
  #include <stdint.h>
  #include <stdbool.h>
  #include <string.h>
  #include <errno.h>
  #include <debug.h>
  
  #include <nuttx/arch.h>
  #include <nuttx/board.h>
  #include <nuttx/spi/spi.h>
  #include <nuttx/lcd/lcd.h>
  
  #include <arch/board/board.h>
  
  #include "up_arch.h"
  #include "stm32.h"
  #include "stm3220g-eval.h"
  
  #if !defined(CONFIG_STM32_ILI9320_DISABLE) || !defined(CONFIG_STM32_ILI9325_DISABLE)
  
  /****************************************************************************
   * Pre-processor Definitions
   ****************************************************************************/
  /* Configuration **********************************************************************/
  /* CONFIG_STM32_ILI9320_DISABLE may be defined to disabled the AM-240320L8TNQW00H
   *  (LCD_ILI9320 or LCD_ILI9321)
   * CONFIG_STM32_ILI9325_DISABLE  may be defined to disabled the AM-240320D5TOQW01H
   *  (LCD_ILI9325)
   */
  
  /* Check contrast selection */
  
  #if !defined(CONFIG_LCD_MAXCONTRAST)
  #  define CONFIG_LCD_MAXCONTRAST 1
  #endif
  
  /* Check power setting */
  
  #if !defined(CONFIG_LCD_MAXPOWER) || CONFIG_LCD_MAXPOWER < 1
  #  define CONFIG_LCD_MAXPOWER 1
  #endif
  
  #if CONFIG_LCD_MAXPOWER > 255
  #  error "CONFIG_LCD_MAXPOWER must be less than 256 to fit in uint8_t"
  #endif
  
  /* Check orientation */
  
  #if defined(CONFIG_LCD_PORTRAIT)
  #  if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE) || defined(CONFIG_LCD_RPORTRAIT)
  #    error "Cannot define both portrait and any other orientations"
  #  endif
  #elif defined(CONFIG_LCD_RPORTRAIT)
  #  if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
  #    error "Cannot define both rportrait and any other orientations"
  #  endif
  #elif defined(CONFIG_LCD_LANDSCAPE)
  #  ifdef CONFIG_LCD_RLANDSCAPE
  #    error "Cannot define both landscape and any other orientations"
  #  endif
  #elif !defined(CONFIG_LCD_RLANDSCAPE)
  #  define CONFIG_LCD_LANDSCAPE 1
  #endif
  
  /* Display/Color Properties ***********************************************************/
  /* Display Resolution */
  
  #if defined(CONFIG_LCD_LANDSCAPE) || defined(CONFIG_LCD_RLANDSCAPE)
  #  define STM3220G_XRES       320
  #  define STM3220G_YRES       240
  #else
  #  define STM3220G_XRES       240
  #  define STM3220G_YRES       320
  #endif
  
  /* Color depth and format */
  
  #define STM3220G_BPP          16
  #define STM3220G_COLORFMT     FB_FMT_RGB16_565
  
  /* STM3220G-EVAL LCD Hardware Definitions *********************************************/
  /* LCD /CS is CE4,  Bank 3 of NOR/SRAM Bank 1~4 */
  
  #define STM3220G_LCDBASE      ((uintptr_t)(0x60000000 | 0x08000000))
  #define LCD                   ((struct lcd_regs_s *)STM3220G_LCDBASE)
  
  #define LCD_REG_0             0x00
  #define LCD_REG_1             0x01
  #define LCD_REG_2             0x02
  #define LCD_REG_3             0x03
  #define LCD_REG_4             0x04
  #define LCD_REG_5             0x05
  #define LCD_REG_6             0x06
  #define LCD_REG_7             0x07
  #define LCD_REG_8             0x08
  #define LCD_REG_9             0x09
  #define LCD_REG_10            0x0a
  #define LCD_REG_12            0x0c
  #define LCD_REG_13            0x0d
  #define LCD_REG_14            0x0e
  #define LCD_REG_15            0x0f
  #define LCD_REG_16            0x10
  #define LCD_REG_17            0x11
  #define LCD_REG_18            0x12
  #define LCD_REG_19            0x13
  #define LCD_REG_20            0x14
  #define LCD_REG_21            0x15
  #define LCD_REG_22            0x16
  #define LCD_REG_23            0x17
  #define LCD_REG_24            0x18
  #define LCD_REG_25            0x19
  #define LCD_REG_26            0x1a
  #define LCD_REG_27            0x1b
  #define LCD_REG_28            0x1c
  #define LCD_REG_29            0x1d
  #define LCD_REG_30            0x1e
  #define LCD_REG_31            0x1f
  #define LCD_REG_32            0x20
  #define LCD_REG_33            0x21
  #define LCD_REG_34            0x22
  #define LCD_REG_36            0x24
  #define LCD_REG_37            0x25
  #define LCD_REG_40            0x28
  #define LCD_REG_41            0x29
  #define LCD_REG_43            0x2b
  #define LCD_REG_45            0x2d
  #define LCD_REG_48            0x30
  #define LCD_REG_49            0x31
  #define LCD_REG_50            0x32
  #define LCD_REG_51            0x33
  #define LCD_REG_52            0x34
  #define LCD_REG_53            0x35
  #define LCD_REG_54            0x36
  #define LCD_REG_55            0x37
  #define LCD_REG_56            0x38
  #define LCD_REG_57            0x39
  #define LCD_REG_58            0x3a
  #define LCD_REG_59            0x3b
  #define LCD_REG_60            0x3c
  #define LCD_REG_61            0x3d
  #define LCD_REG_62            0x3e
  #define LCD_REG_63            0x3f
  #define LCD_REG_64            0x40
  #define LCD_REG_65            0x41
  #define LCD_REG_66            0x42
  #define LCD_REG_67            0x43
  #define LCD_REG_68            0x44
  #define LCD_REG_69            0x45
  #define LCD_REG_70            0x46
  #define LCD_REG_71            0x47
  #define LCD_REG_72            0x48
  #define LCD_REG_73            0x49
  #define LCD_REG_74            0x4a
  #define LCD_REG_75            0x4b
  #define LCD_REG_76            0x4c
  #define LCD_REG_77            0x4d
  #define LCD_REG_78            0x4e
  #define LCD_REG_79            0x4f
  #define LCD_REG_80            0x50
  #define LCD_REG_81            0x51
  #define LCD_REG_82            0x52
  #define LCD_REG_83            0x53
  #define LCD_REG_96            0x60
  #define LCD_REG_97            0x61
  #define LCD_REG_106           0x6a
  #define LCD_REG_118           0x76
  #define LCD_REG_128           0x80
  #define LCD_REG_129           0x81
  #define LCD_REG_130           0x82
  #define LCD_REG_131           0x83
  #define LCD_REG_132           0x84
  #define LCD_REG_133           0x85
  #define LCD_REG_134           0x86
  #define LCD_REG_135           0x87
  #define LCD_REG_136           0x88
  #define LCD_REG_137           0x89
  #define LCD_REG_139           0x8b
  #define LCD_REG_140           0x8c
  #define LCD_REG_141           0x8d
  #define LCD_REG_143           0x8f
  #define LCD_REG_144           0x90
  #define LCD_REG_145           0x91
  #define LCD_REG_146           0x92
  #define LCD_REG_147           0x93
  #define LCD_REG_148           0x94
  #define LCD_REG_149           0x95
  #define LCD_REG_150           0x96
  #define LCD_REG_151           0x97
  #define LCD_REG_152           0x98
  #define LCD_REG_153           0x99
  #define LCD_REG_154           0x9a
  #define LCD_REG_157           0x9d
  #define LCD_REG_164           0xa4
  #define LCD_REG_192           0xc0
  #define LCD_REG_193           0xc1
  #define LCD_REG_229           0xe5
  
  /* LCD IDs */
  
  #define ILI9320_ID            0x9320
  #define ILI9321_ID            0x9321
  #define ILI9325_ID            0x9325
  
  /****************************************************************************
   * Private Type Definition
   ****************************************************************************/
  
  /* LCD type */
  
  enum lcd_type_e
  {
    LCD_TYPE_UNKNOWN = 0,
    LCD_TYPE_ILI9320,
    LCD_TYPE_ILI9325
  };
  
  /* This structure describes the LCD registers */
  
  struct lcd_regs_s
  {
    volatile uint16_t address;
    volatile uint16_t value;
  };
  
  /* This structure describes the state of this driver */
  
  struct stm3220g_dev_s
  {
    /* Publicly visible device structure */
  
    struct lcd_dev_s dev;
  
    /* Private LCD-specific information follows */
  
    uint8_t  type;        /* LCD type. See enum lcd_type_e */
    uint8_t  power;       /* Current power setting */
  };
  
  /****************************************************************************
   * Private Function Protototypes
   ****************************************************************************/
  /* Low Level LCD access */
  
  static void stm3220g_writereg(uint8_t regaddr, uint16_t regval);
  static uint16_t stm3220g_readreg(uint8_t regaddr);
  static inline void stm3220g_gramselect(void);
  static inline void stm3220g_writegram(uint16_t rgbval);
  static void stm3220g_readnosetup(FAR uint16_t *accum);
  static uint16_t stm3220g_readnoshift(FAR uint16_t *accum);
  static void stm3220g_setcursor(uint16_t col, uint16_t row);
  
  /* LCD Data Transfer Methods */
  
  static int stm3220g_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer,
               size_t npixels);
  static int stm3220g_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
               size_t npixels);
  
  /* LCD Configuration */
  
  static int stm3220g_getvideoinfo(FAR struct lcd_dev_s *dev,
               FAR struct fb_videoinfo_s *vinfo);
  static int stm3220g_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
               FAR struct lcd_planeinfo_s *pinfo);
  
  /* LCD RGB Mapping */
  
  #ifdef CONFIG_FB_CMAP
  #  error "RGB color mapping not supported by this driver"
  #endif
  
  /* Cursor Controls */
  
  #ifdef CONFIG_FB_HWCURSOR
  #  error "Cursor control not supported by this driver"
  #endif
  
  /* LCD Specific Controls */
  
  static int stm3220g_getpower(struct lcd_dev_s *dev);
  static int stm3220g_setpower(struct lcd_dev_s *dev, int power);
  static int stm3220g_getcontrast(struct lcd_dev_s *dev);
  static int stm3220g_setcontrast(struct lcd_dev_s *dev, unsigned int contrast);
  
  /* Initialization */
  
  static inline void stm3220g_lcdinitialize(void);
  
  /****************************************************************************
   * Private Data
   ****************************************************************************/
  
  /* This is working memory allocated by the LCD driver for each LCD device
   * and for each color plane.  This memory will hold one raster line of data.
   * The size of the allocated run buffer must therefore be at least
   * (bpp * xres / 8).  Actual alignment of the buffer must conform to the
   * bitwidth of the underlying pixel type.
   *
   * If there are multiple planes, they may share the same working buffer
   * because different planes will not be operate on concurrently.  However,
   * if there are multiple LCD devices, they must each have unique run buffers.
   */
  
  static uint16_t g_runbuffer[STM3220G_XRES];
  
  /* This structure describes the overall LCD video controller */
  
  static const struct fb_videoinfo_s g_videoinfo =
  {
    .fmt     = STM3220G_COLORFMT,    /* Color format: RGB16-565: RRRR RGGG GGGB BBBB */
    .xres    = STM3220G_XRES,        /* Horizontal resolution in pixel columns */
    .yres    = STM3220G_YRES,        /* Vertical resolution in pixel rows */
    .nplanes = 1,                    /* Number of color planes supported */
  };
  
  /* This is the standard, NuttX Plane information object */
  
  static const struct lcd_planeinfo_s g_planeinfo =
  {
    .putrun = stm3220g_putrun,       /* Put a run into LCD memory */
    .getrun = stm3220g_getrun,       /* Get a run from LCD memory */
    .buffer = (uint8_t*)g_runbuffer, /* Run scratch buffer */
    .bpp    = STM3220G_BPP,          /* Bits-per-pixel */
  };
  
  /* This is the standard, NuttX LCD driver object */
  
  static struct stm3220g_dev_s g_lcddev =
  {
    .dev =
    {
      /* LCD Configuration */
  
      .getvideoinfo = stm3220g_getvideoinfo,
      .getplaneinfo = stm3220g_getplaneinfo,
  
      /* LCD RGB Mapping -- Not supported */
      /* Cursor Controls -- Not supported */
  
      /* LCD Specific Controls */
  
      .getpower     = stm3220g_getpower,
      .setpower     = stm3220g_setpower,
      .getcontrast  = stm3220g_getcontrast,
      .setcontrast  = stm3220g_setcontrast,
    },
  };
  
  /****************************************************************************
   * Private Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name:  stm3220g_writereg
   *
   * Description:
   *   Write to an LCD register
   *
   ****************************************************************************/
  
  static void stm3220g_writereg(uint8_t regaddr, uint16_t regval)
  {
    /* Write the register address then write the register value */
  
    LCD->address = regaddr;
    LCD->value   = regval;
  }
  
  /****************************************************************************
   * Name:  stm3220g_readreg
   *
   * Description:
   *   Read from an LCD register
   *
   ****************************************************************************/
  
  static uint16_t stm3220g_readreg(uint8_t regaddr)
  {
    /* Write the register address then read the register value */
  
    LCD->address = regaddr;
    return LCD->value;
  }
  
  /****************************************************************************
   * Name:  stm3220g_gramselect
   *
   * Description:
   *   Setup to read or write multiple pixels to the GRAM memory
   *
   ****************************************************************************/
  
  static inline void stm3220g_gramselect(void)
  {
    LCD->address = LCD_REG_34;
  }
  
  /****************************************************************************
   * Name:  stm3220g_writegram
   *
   * Description:
   *   Write one pixel to the GRAM memory
   *
   ****************************************************************************/
  
  static inline void stm3220g_writegram(uint16_t rgbval)
  {
    /* Write the value (GRAM register already selected) */
  
    LCD->value = rgbval;
  }
  
  /****************************************************************************
   * Name:  stm3220g_readnosetup
   *
   * Description:
   *   Prime the operation by reading one pixel from the GRAM memory if necessary for
   *   this LCD type.  When reading 16-bit gram data, there may be some shifts in the
   *   returned data:
   *
   *   - ILI932x: Discard first dummy read; no shift in the return data
   *
   ****************************************************************************/
  
  static void stm3220g_readnosetup(FAR uint16_t *accum)
  {
    /* Read-ahead one pixel */
  
    *accum  = LCD->value;
  }
  
  /****************************************************************************
   * Name:  stm3220g_readnoshift
   *
   * Description:
   *   Read one correctly aligned pixel from the GRAM memory.  Possibly shifting the
   *   data and possibly swapping red and green components.
   *
   *   - ILI932x: Unknown -- assuming colors are in the color order
   *
   ****************************************************************************/
  
  static uint16_t stm3220g_readnoshift(FAR uint16_t *accum)
  {
    /* Read the value (GRAM register already selected) */
  
    return LCD->value;
  }
  
  /****************************************************************************
   * Name:  stm3220g_setcursor
   *
   * Description:
   *   Set the cursor position.  In landscape mode, the "column" is actually the physical
   *   Y position and the "row" is the physical X position.
   *
   ****************************************************************************/
  
  static void stm3220g_setcursor(uint16_t col, uint16_t row)
  {
    stm3220g_writereg(LCD_REG_32, row); /* GRAM horizontal address */
    stm3220g_writereg(LCD_REG_33, col); /* GRAM vertical address */
  }
  
  /****************************************************************************
   * Name:  stm3220g_dumprun
   *
   * Description:
   *   Dump the contexts of the run buffer:
   *
   *  run     - The buffer in containing the run read to be dumped
   *  npixels - The number of pixels to dump
   *
   ****************************************************************************/
  
  #if 0 /* Sometimes useful */
  static void stm3220g_dumprun(FAR const char *msg, FAR uint16_t *run, size_t npixels)
  {
    int i, j;
  
    syslog(LOG_DEBUG, "\n%s:\n", msg);
    for (i = 0; i < npixels; i += 16)
      {
        up_putc(' ');
        syslog(LOG_DEBUG, " ");
        for (j = 0; j < 16; j++)
          {
            syslog(LOG_DEBUG, " %04x", *run++);
          }
  
        up_putc('\n');
      }
  }
  #endif
  
  /****************************************************************************
   * Name:  stm3220g_putrun
   *
   * Description:
   *   This method can be used to write a partial raster line to the LCD:
   *
   *   row     - Starting row to write to (range: 0 <= row < yres)
   *   col     - Starting column to write to (range: 0 <= col <= xres-npixels)
   *   buffer  - The buffer containing the run to be written to the LCD
   *   npixels - The number of pixels to write to the LCD
   *             (range: 0 < npixels <= xres-col)
   *
   ****************************************************************************/
  
  static int stm3220g_putrun(fb_coord_t row, fb_coord_t col, FAR const uint8_t *buffer,
                         size_t npixels)
  {
    FAR const uint16_t *src = (FAR const uint16_t*)buffer;
    int i;
  
    /* Buffer must be provided and aligned to a 16-bit address boundary */
  
    lcdinfo("row: %d col: %d npixels: %d\n", row, col, npixels);
    DEBUGASSERT(buffer && ((uintptr_t)buffer & 1) == 0);
  
    /* Write the run to GRAM. */
  
  #ifdef CONFIG_LCD_LANDSCAPE
    /* Convert coordinates -- Here the edge away from the row of buttons on
     * the STM3220G-EVAL is used as the top.
     */
  
    /* Write the GRAM data, manually incrementing X */
  
    for (i = 0; i < npixels; i++)
      {
        /* Write the next pixel to this position */
  
        stm3220g_setcursor(col, row);
        stm3220g_gramselect();
        stm3220g_writegram(*src++);
  
        /* Increment to next column */
  
        col++;
      }
  #elif defined(CONFIG_LCD_RLANDSCAPE)
    /* Convert coordinates -- Here the edge next to the row of buttons on
     * the STM3220G-EVAL is used as the top.
     */
  
    col = (STM3220G_XRES-1) - col;
    row = (STM3220G_YRES-1) - row;
  
    /* Set the cursor position */
  
    stm3220g_setcursor(col, row);
  
    /* Then write the GRAM data, auto-decrementing X */
  
    stm3220g_gramselect();
    for (i = 0; i < npixels; i++)
      {
        /* Write the next pixel to this position (auto-decrements to the next column) */
  
        stm3220g_writegram(*src++);
      }
  #elif defined(CONFIG_LCD_PORTRAIT)
    /* Convert coordinates.  In this configuration, the top of the display is to the left
     * of the buttons (if the board is held so that the buttons are at the bottom of the
     * board).
     */
  
    col = (STM3220G_XRES-1) - col;
  
    /* Then write the GRAM data, manually incrementing Y (which is col) */
  
    for (i = 0; i < npixels; i++)
      {
        /* Write the next pixel to this position */
  
        stm3220g_setcursor(row, col);
        stm3220g_gramselect();
        stm3220g_writegram(*src++);
  
        /* Increment to next column */
  
        col--;
      }
  #else /* CONFIG_LCD_RPORTRAIT */
    /* Convert coordinates.  In this configuration, the top of the display is to the right
     * of the buttons (if the board is held so that the buttons are at the bottom of the
     * board).
     */
  
    row = (STM3220G_YRES-1) - row;
  
    /* Then write the GRAM data, manually incrementing Y (which is col) */
  
    for (i = 0; i < npixels; i++)
      {
        /* Write the next pixel to this position */
  
        stm3220g_setcursor(row, col);
        stm3220g_gramselect();
        stm3220g_writegram(*src++);
  
        /* Decrement to next column */
  
        col++;
      }
  #endif
    return OK;
  }
  
  /****************************************************************************
   * Name:  stm3220g_getrun
   *
   * Description:
   *   This method can be used to read a partial raster line from the LCD:
   *
   *  row     - Starting row to read from (range: 0 <= row < yres)
   *  col     - Starting column to read read (range: 0 <= col <= xres-npixels)
   *  buffer  - The buffer in which to return the run read from the LCD
   *  npixels - The number of pixels to read from the LCD
   *            (range: 0 < npixels <= xres-col)
   *
   ****************************************************************************/
  
  static int stm3220g_getrun(fb_coord_t row, fb_coord_t col, FAR uint8_t *buffer,
                         size_t npixels)
  {
    FAR uint16_t *dest = (FAR uint16_t*)buffer;
    void (*readsetup)(FAR uint16_t *accum);
    uint16_t (*readgram)(FAR uint16_t *accum);
    uint16_t accum;
    int i;
  
    /* Buffer must be provided and aligned to a 16-bit address boundary */
  
    lcdinfo("row: %d col: %d npixels: %d\n", row, col, npixels);
    DEBUGASSERT(buffer && ((uintptr_t)buffer & 1) == 0);
  
    /* Configure according to the LCD type.  Kind of silly with only one LCD type. */
  
    switch (g_lcddev.type)
     {
       case LCD_TYPE_ILI9320:
       case LCD_TYPE_ILI9325:
         readsetup = stm3220g_readnosetup;
         readgram  = stm3220g_readnoshift;
         break;
  
       default:  /* Shouldn't happen */
         return -ENOSYS;
     }
  
    /* Read the run from GRAM. */
  
  #ifdef CONFIG_LCD_LANDSCAPE
    /* Convert coordinates -- Here the edge away from the row of buttons on
     * the STM3220G-EVAL is used as the top.
     */
  
    for (i = 0; i < npixels; i++)
      {
        /* Read the next pixel from this position */
  
        stm3220g_setcursor(row, col);
        stm3220g_gramselect();
        readsetup(&accum);
        *dest++ = readgram(&accum);
  
        /* Increment to next column */
  
        col++;
      }
  #elif defined(CONFIG_LCD_RLANDSCAPE)
    /* Convert coordinates -- Here the edge next to the row of buttons on
     * the STM3220G-EVAL is used as the top.
     */
  
    col = (STM3220G_XRES-1) - col;
    row = (STM3220G_YRES-1) - row;
  
    /* Set the cursor position */
  
    stm3220g_setcursor(col, row);
  
    /* Then read the GRAM data, auto-decrementing Y */
  
    stm3220g_gramselect();
  
    /* Prime the pump for unaligned read data */
  
    readsetup(&accum);
  
    for (i = 0; i < npixels; i++)
      {
        /* Read the next pixel from this position (autoincrements to the next row) */
  
        *dest++ = readgram(&accum);
      }
  #elif defined(CONFIG_LCD_PORTRAIT)
    /* Convert coordinates.  In this configuration, the top of the display is to the left
     * of the buttons (if the board is held so that the buttons are at the bottom of the
     * board).
     */
  
    col = (STM3220G_XRES-1) - col;
  
    /* Then read the GRAM data, manually incrementing Y (which is col) */
  
    for (i = 0; i < npixels; i++)
      {
        /* Read the next pixel from this position */
  
        stm3220g_setcursor(row, col);
        stm3220g_gramselect();
        readsetup(&accum);
        *dest++ = readgram(&accum);
  
        /* Increment to next column */
  
        col--;
      }
  #else /* CONFIG_LCD_RPORTRAIT */
    /* Convert coordinates.  In this configuration, the top of the display is to the right
     * of the buttons (if the board is held so that the buttons are at the bottom of the
     * board).
     */
  
    row = (STM3220G_YRES-1) - row;
  
    /* Then write the GRAM data, manually incrementing Y (which is col) */
  
    for (i = 0; i < npixels; i++)
      {
        /* Write the next pixel to this position */
  
        stm3220g_setcursor(row, col);
        stm3220g_gramselect();
        readsetup(&accum);
        *dest++ = readgram(&accum);
  
        /* Decrement to next column */
  
        col++;
      }
  #endif
  
    return OK;
  }
  
  /****************************************************************************
   * Name:  stm3220g_getvideoinfo
   *
   * Description:
   *   Get information about the LCD video controller configuration.
   *
   ****************************************************************************/
  
  static int stm3220g_getvideoinfo(FAR struct lcd_dev_s *dev,
                                   FAR struct fb_videoinfo_s *vinfo)
  {
    DEBUGASSERT(dev && vinfo);
    lcdinfo("fmt: %d xres: %d yres: %d nplanes: %d\n",
            g_videoinfo.fmt, g_videoinfo.xres, g_videoinfo.yres, g_videoinfo.nplanes);
    memcpy(vinfo, &g_videoinfo, sizeof(struct fb_videoinfo_s));
    return OK;
  }
  
  /****************************************************************************
   * Name:  stm3220g_getplaneinfo
   *
   * Description:
   *   Get information about the configuration of each LCD color plane.
   *
   ****************************************************************************/
  
  static int stm3220g_getplaneinfo(FAR struct lcd_dev_s *dev, unsigned int planeno,
                                FAR struct lcd_planeinfo_s *pinfo)
  {
    DEBUGASSERT(dev && pinfo && planeno == 0);
    lcdinfo("planeno: %d bpp: %d\n", planeno, g_planeinfo.bpp);
    memcpy(pinfo, &g_planeinfo, sizeof(struct lcd_planeinfo_s));
    return OK;
  }
  
  /****************************************************************************
   * Name:  stm3220g_getpower
   *
   * Description:
   *   Get the LCD panel power status (0: full off - CONFIG_LCD_MAXPOWER: full on). On
   *   backlit LCDs, this setting may correspond to the backlight setting.
   *
   ****************************************************************************/
  
  static int stm3220g_getpower(struct lcd_dev_s *dev)
  {
    lcdinfo("power: %d\n", 0);
    return g_lcddev.power;
  }
  
  /****************************************************************************
   * Name:  stm3220g_poweroff
   *
   * Description:
   *   Enable/disable LCD panel power (0: full off - CONFIG_LCD_MAXPOWER: full on). On
   *   backlit LCDs, this setting may correspond to the backlight setting.
   *
   ****************************************************************************/
  
  static int stm3220g_poweroff(void)
  {
    /* Turn the display off */
  
    stm3220g_writereg(LCD_REG_7, 0);
  
    /* Remember the power off state */
  
    g_lcddev.power = 0;
    return OK;
  }
  
  /****************************************************************************
   * Name:  stm3220g_setpower
   *
   * Description:
   *   Enable/disable LCD panel power (0: full off - CONFIG_LCD_MAXPOWER: full on). On
   *   backlit LCDs, this setting may correspond to the backlight setting.
   *
   ****************************************************************************/
  
  static int stm3220g_setpower(struct lcd_dev_s *dev, int power)
  {
    lcdinfo("power: %d\n", power);
    DEBUGASSERT((unsigned)power <= CONFIG_LCD_MAXPOWER);
  
    /* Set new power level */
  
    if (power > 0)
      {
        /* Then turn the display on */
  
  #if !defined(CONFIG_STM32_ILI9320_DISABLE) || !defined(CONFIG_STM32_ILI9325_DISABLE)
        stm3220g_writereg(LCD_REG_7, 0x0173);
  #endif
        g_lcddev.power = power;
      }
    else
      {
        /* Turn the display off */
  
        stm3220g_poweroff();
      }
  
    return OK;
  }
  
  /****************************************************************************
   * Name:  stm3220g_getcontrast
   *
   * Description:
   *   Get the current contrast setting (0-CONFIG_LCD_MAXCONTRAST).
   *
   ****************************************************************************/
  
  static int stm3220g_getcontrast(struct lcd_dev_s *dev)
  {
    lcdinfo("Not implemented\n");
    return -ENOSYS;
  }
  
  /****************************************************************************
   * Name:  stm3220g_setcontrast
   *
   * Description:
   *   Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
   *
   ****************************************************************************/
  
  static int stm3220g_setcontrast(struct lcd_dev_s *dev, unsigned int contrast)
  {
    lcdinfo("contrast: %d\n", contrast);
    return -ENOSYS;
  }
  
  /****************************************************************************
   * Name:  stm3220g_lcdinitialize
   *
   * Description:
   *   Set LCD panel contrast (0-CONFIG_LCD_MAXCONTRAST).
   *
   ****************************************************************************/
  
  static inline void stm3220g_lcdinitialize(void)
  {
    uint16_t id;
  
    /* Check LCD ID */
  
    id = stm3220g_readreg(LCD_REG_0);
    lcdinfo("LCD ID: %04x\n", id);
  
    /* Check if the ID is for the STM32_ILI9320 (or ILI9321) or STM32_ILI9325 */
  
  #if !defined(CONFIG_STM32_ILI9320_DISABLE) && !defined(CONFIG_STM32_ILI9325_DISABLE)
    if (id == ILI9320_ID || id == ILI9321_ID || id == ILI9325_ID)
  #elif !defined(CONFIG_STM32_ILI9320_DISABLE) && defined(CONFIG_STM32_ILI9325_DISABLE)
    if (id == ILI9320_ID || id == ILI9321_ID)
  #else /* if defined(CONFIG_STM32_ILI9320_DISABLE) && !defined(CONFIG_STM32_ILI9325_DISABLE)) */
    if (id == ILI9325_ID)
  #endif
      {
        /* Save the LCD type (not actually used at for anything important) */
  
  #if !defined(CONFIG_STM32_ILI9320_DISABLE)
  # if !defined(CONFIG_STM32_ILI9325_DISABLE)
        if (id == ILI9325_ID)
          {
            g_lcddev.type = LCD_TYPE_ILI9325;
          }
        else
  # endif
          {
            g_lcddev.type = LCD_TYPE_ILI9320;
            stm3220g_writereg(LCD_REG_229, 0x8000); /* Set the internal vcore voltage */
          }
  #else /* if !defined(CONFIG_STM32_ILI9325_DISABLE) */
        g_lcddev.type = LCD_TYPE_ILI9325;
  #endif
        lcdinfo("LCD type: %d\n", g_lcddev.type);
  
        /* Start Initial Sequence */
  
        stm3220g_writereg(LCD_REG_0,   0x0001); /* Start internal OSC. */
        stm3220g_writereg(LCD_REG_1,   0x0100); /* Set SS and SM bit */
        stm3220g_writereg(LCD_REG_2,   0x0700); /* Set 1 line inversion */
        stm3220g_writereg(LCD_REG_3,   0x1030); /* Set GRAM write direction and BGR=1. */
      //stm3220g_writereg(LCD_REG_3,   0x1018); /* Set GRAM write direction and BGR=1. */
        stm3220g_writereg(LCD_REG_4,   0x0000); /* Resize register */
        stm3220g_writereg(LCD_REG_8,   0x0202); /* Set the back porch and front porch */
        stm3220g_writereg(LCD_REG_9,   0x0000); /* Set non-display area refresh cycle ISC[3:0] */
        stm3220g_writereg(LCD_REG_10,  0x0000); /* FMARK function */
        stm3220g_writereg(LCD_REG_12,  0x0000); /* RGB interface setting */
        stm3220g_writereg(LCD_REG_13,  0x0000); /* Frame marker Position */
        stm3220g_writereg(LCD_REG_15,  0x0000); /* RGB interface polarity */
  
        /* Power On sequence */
  
        stm3220g_writereg(LCD_REG_16,  0x0000); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
        stm3220g_writereg(LCD_REG_17,  0x0000); /* DC1[2:0], DC0[2:0], VC[2:0] */
        stm3220g_writereg(LCD_REG_18,  0x0000); /* VREG1OUT voltage */
        stm3220g_writereg(LCD_REG_19,  0x0000); /* VDV[4:0] for VCOM amplitude */
        up_mdelay(200);                         /* Dis-charge capacitor power voltage (200ms) */
  
        stm3220g_writereg(LCD_REG_16,  0x17b0); /* SAP, BT[3:0], AP, DSTB, SLP, STB */
        stm3220g_writereg(LCD_REG_17,  0x0137); /* DC1[2:0], DC0[2:0], VC[2:0] */
        up_mdelay(50);
  
        stm3220g_writereg(LCD_REG_18,  0x0139); /* VREG1OUT voltage */
        up_mdelay(50);
  
        stm3220g_writereg(LCD_REG_19,  0x1d00); /* VDV[4:0] for VCOM amplitude */
        stm3220g_writereg(LCD_REG_41,  0x0013); /* VCM[4:0] for VCOMH */
        up_mdelay(50);
  
        stm3220g_writereg(LCD_REG_32,  0x0000); /* GRAM horizontal Address */
        stm3220g_writereg(LCD_REG_33,  0x0000); /* GRAM Vertical Address */
  
        /* Adjust the Gamma Curve (ILI9320/1) */
  
  #if !defined(CONFIG_STM32_ILI9320_DISABLE)
  # if !defined(CONFIG_STM32_ILI9325_DISABLE)
      if (g_lcddev.type == LCD_TYPE_ILI9320)
  # endif
        {
          stm3220g_writereg(LCD_REG_48,  0x0006);
          stm3220g_writereg(LCD_REG_49,  0x0101);
          stm3220g_writereg(LCD_REG_50,  0x0003);
          stm3220g_writereg(LCD_REG_53,  0x0106);
          stm3220g_writereg(LCD_REG_54,  0x0b02);
          stm3220g_writereg(LCD_REG_55,  0x0302);
          stm3220g_writereg(LCD_REG_56,  0x0707);
          stm3220g_writereg(LCD_REG_57,  0x0007);
          stm3220g_writereg(LCD_REG_60,  0x0600);
          stm3220g_writereg(LCD_REG_61,  0x020b);
        }
  #endif
        /* Adjust the Gamma Curve (ILI9325) */
  
  #if !defined(CONFIG_STM32_ILI9325_DISABLE)
  # if !defined(CONFIG_STM32_ILI9320_DISABLE)
      else
  # endif
        {
          stm3220g_writereg(LCD_REG_48, 0x0007);
          stm3220g_writereg(LCD_REG_49, 0x0302);
          stm3220g_writereg(LCD_REG_50, 0x0105);
          stm3220g_writereg(LCD_REG_53, 0x0206);
          stm3220g_writereg(LCD_REG_54, 0x0808);
          stm3220g_writereg(LCD_REG_55, 0x0206);
          stm3220g_writereg(LCD_REG_56, 0x0504);
          stm3220g_writereg(LCD_REG_57, 0x0007);
          stm3220g_writereg(LCD_REG_60, 0x0105);
          stm3220g_writereg(LCD_REG_61, 0x0808);
        }
  #endif
  
        /* Set GRAM area */
  
        stm3220g_writereg(LCD_REG_80,  0x0000); /* Horizontal GRAM Start Address */
        stm3220g_writereg(LCD_REG_81,  0x00ef); /* Horizontal GRAM End Address */
        stm3220g_writereg(LCD_REG_82,  0x0000); /* Vertical GRAM Start Address */
        stm3220g_writereg(LCD_REG_83,  0x013f); /* Vertical GRAM End Address */
        stm3220g_writereg(LCD_REG_96,  0x2700); /* Gate Scan Line */
      //stm3220g_writereg(LCD_REG_96,  0xa700); /* Gate Scan Line(GS=1, scan direction is G320~G1) */
        stm3220g_writereg(LCD_REG_97,  0x0001); /* NDL,VLE, REV */
        stm3220g_writereg(LCD_REG_106, 0x0000); /* Set scrolling line */
  
        /* Partial Display Control */
  
        stm3220g_writereg(LCD_REG_128, 0x0000);
        stm3220g_writereg(LCD_REG_129, 0x0000);
        stm3220g_writereg(LCD_REG_130, 0x0000);
        stm3220g_writereg(LCD_REG_131, 0x0000);
        stm3220g_writereg(LCD_REG_132, 0x0000);
        stm3220g_writereg(LCD_REG_133, 0x0000);
  
        /* Panel Control */
  
        stm3220g_writereg(LCD_REG_144, 0x0010);
        stm3220g_writereg(LCD_REG_146, 0x0000);
        stm3220g_writereg(LCD_REG_147, 0x0003);
        stm3220g_writereg(LCD_REG_149, 0x0110);
        stm3220g_writereg(LCD_REG_151, 0x0000);
        stm3220g_writereg(LCD_REG_152, 0x0000);
  
        /* Set GRAM write direction and BGR = 1
         *
         * I/D=01 (Horizontal : increment, Vertical : decrement)
         * AM=1 (address is updated in vertical writing direction)
         */
  
        stm3220g_writereg(LCD_REG_3, 0x1018);
        stm3220g_writereg(LCD_REG_7, 0);       /* Display off */
      }
    else
      {
        lcderr("ERROR: Unsupported LCD type\n");
      }
  }
  
  /****************************************************************************
   * Public Functions
   ****************************************************************************/
  
  /****************************************************************************
   * Name:  board_lcd_initialize
   *
   * 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).
   *
   ****************************************************************************/
  
  int board_lcd_initialize(void)
  {
    lcdinfo("Initializing\n");
  
    /* Configure GPIO pins and configure the FSMC to support the LCD */
  
    stm32_selectlcd();
  
    /* Configure and enable LCD */
  
    up_mdelay(50);
    stm3220g_lcdinitialize();
  
    /* Clear the display (setting it to the color 0=black) */
  
    stm3220g_lcdclear(0);
  
    /* Turn the display off */
  
    stm3220g_poweroff();
    return OK;
  }
  
  /****************************************************************************
   * Name:  board_lcd_getdev
   *
   * Description:
   *   Return a a reference to the LCD object for the specified LCD.  This allows support
   *   for multiple LCD devices.
   *
   ****************************************************************************/
  
  FAR struct lcd_dev_s *board_lcd_getdev(int lcddev)
  {
    DEBUGASSERT(lcddev == 0);
    return &g_lcddev.dev;
  }
  
  /****************************************************************************
   * Name:  board_lcd_uninitialize
   *
   * Description:
   *   Uninitialize the LCD support
   *
   ****************************************************************************/
  
  void board_lcd_uninitialize(void)
  {
    stm3220g_poweroff();
    stm32_deselectlcd();
  }
  
  /****************************************************************************
   * Name:  stm3220g_lcdclear
   *
   * Description:
   *   This is a non-standard LCD interface just for the stm3220g-EVAL board.  Because
   *   of the various rotations, clearing the display in the normal way by writing a
   *   sequences of runs that covers the entire display can be very slow.  Here the
   *   display is cleared by simply setting all GRAM memory to the specified color.
   *
   ****************************************************************************/
  
  void stm3220g_lcdclear(uint16_t color)
  {
    uint32_t i = 0;
  
    stm3220g_setcursor(0, STM3220G_XRES-1);
    stm3220g_gramselect();
    for (i = 0; i < STM3220G_XRES * STM3220G_YRES; i++)
      {
        LCD->value = color;
      }
  }
  
  #endif /* !CONFIG_STM32_ILI9320_DISABLE || !CONFIG_STM32_ILI9325_DISABLE */
  