TQ2440 Study Notes—— 25. LCD Controller

LCD Controller

programming:

1. Turn on the backlight

2. Timing settings

3. Write data in FrameBuffer (different pixels have different formats)

/*

 * FILE: lcddrv.c

 * Provides low-level functions for operating LCD controllers, palettes, etc.

 */

#include

#include "s3c24xx.h"

#include "lcddrv.h"

#define GPB0_tout0  (2<<(0*2))

#define GPB0_out    (1<<(0*2))

#define GPB1_out    (1<<(1*2))

#define GPB0_MSK    (3<<(0*2))

#define GPB1_MSK    (3<<(1*2))

unsigned int fb_base_addr;

unsigned int bpp;

unsigned int xsize;

unsigned int ysize;

static const unsigned short DEMO256pal[]={

    0x0b5e,0xce9a,0xffd9,0x9d99,0xb63a,0xae7c,0xdd71,0x6c57,0xfd4d,0x00ae,0x9c4d,0xb5f8,0xad96,0x0131,0x0176,0xefff,0xcedd,0x9556,0xe4bf,0x00b6,0x22b7,0x002b,0x89de,0x002c,0x57df,0xab5f,0x3031,0x14bf,0x797e,0x5391,0x93ab,0x7239,0x7453,0xafdf,0x71b9,0x8c92,0x014d,0x302e,0x5175,0x0029,0x0969,0x004e,0x2a6d,0x0021,0x3155,0x4b6e,0xd677,0xf6b6,0x9b5f,0x4bb5,0xffd5,0x0027,0xdfdf,0x74d8,0x1256,0x6bcd,0x9b08,0x2ab2,0xbd72,0x84b5,0xfe52,0xd4ad,0x00ad,0xfffc,0x422b,0x73b0,0x0024,0x5246,0x8e5e,0x28b3,0x0050,0x3b52,0x2a4a,0x3a74,0x8559,0x3356,0x1251,0x9abf,0x4034,0x40b1,

    0x8cb9,0x00b3,0x5c55,0xdf3d,0x61b7,0x1f5f,0x00d9,0x4c59,0x0926,0xac3f,0x925f,0x85bc,0x29d2,0xc73f,0xef5c,0xcb9f,0x827b,0x5279,0x4af5,0x01b9,0x4290,0xf718,0x126d,0x21a6,0x515e,0xefbd,0xd75e,0x42ab,0x00aa,0x10b3,0x7349,0x63b5,0x61a3,0xaadf,0xcb27,0x87df,0x6359,0xc7df,0x4876,0xb5bc,0x4114,0xfe2e,0xef5e,0x65be,0x43b9,0xe5df,0x21c9,0x7d16,0x6abb,0x5c11,0x49f7,0xbc0b,0x9e1a,0x3b0f,0x202b,0xff12,0x821b,0x842f,0xbccf,0xdefb,0x8a3e,0x68fa,0xa4f1,0x38ae,0x28b7,0x21ad,0x31d7,0x0073,0x182b,0x1831,0x3415,0xbdf6,0x2dbf,0x0a5d,0xc73d,0x182c,0x293e,0x7b3d,0x643d,0x3cbd,

    0x92dd,0x09d4,0x1029,0x7cdd,0x6239,0x182e,0x5aea,0x11eb,0x8abc,0x7bfa,0x00a7,0x2153,0x1853,0x1318,0x0109,0x54fa,0x72a7,0x89e3,0x01cf,0x3a07,0x7b17,0x1a14,0x2150,0x23dc,0x4142,0x1b33,0x00a4,0xf6df,0x08fc,0x18ae,0x3a7e,0x18d1,0xa51c,0xff5a,0x1a0f,0x28fa,0xdfbe,0x82de,0x60d7,0x1027,0x48fa,0x5150,0x6213,0x89d6,0x110d,0x9bbb,0xbedd,0x28e1,0x1925,0xf449,0xaa79,0xd5f4,0x693c,0x110a,0x2889,0x08a2,0x923d,0x10a6,0xd9bc,0x5b2e,0x32ec,0xcf7f,0x1025,0x2148,0x74b4,0x6d59,0x9d14,0x0132,0x00f0,0x56bf,0x00f1,0xffff,0x0173,0x0133,0x00b0,0x00b1,0xf7ff,0x08b1,0xfffe,0x08b0,

    0x0171,0xf7bf,0x10f3,0xf7fe,0x08ef,0x1192,0xefbe,0x1131,0x2177,0xff9f,0x1116,0xffbc,0x5914,0x22ef,0xb285,0xa6df,

};

/*

 * Initialize the pins for the LCD

 */

void Lcd_Port_Init(void)

{

    GPCUP = 0xffffffff; // Disable internal pull-up

    GPCCON = 0xaaaaaaaa; // GPIO pins for VD[7:0], LCDVF[2:0], VM, VFRAME, VLINE, VCLK, LEND 

    GPDUP = 0xffffffff; // Disable internal pull-up

    GPDCON = 0xaaaaaaaa; // GPIO pins for VD[23:8]

  GPBCON &= ~(GPB0_MSK);  // Power enable pin

    GPBCON |= GPB0_out;

    GPBDAT &= ~(1<<0); // Power off

    printf("Initializing GPIO ports..........n");

}

/*

 * Initialize LCD controller

 * Input parameters:

 * type: display mode

 * MODE_TFT_8BIT_240320 : 240*320 8bpp TFT LCD

 * MODE_TFT_16BIT_240320 : 240*320 16bpp TFT LCD

 * MODE_TFT_8BIT_640480 : 640*480 8bpp TFT LCD

 * MODE_TFT_16BIT_640480 : 640*480 16bpp TFT LCD

 */

void Tft_Lcd_Init(int type)

{

    switch(type)

    {

    case MODE_TFT_8BIT_480272:

        /* 

         * Set the LCD controller's control registers LCDCON1~5

         * 1. LCDCON1:

         * Set the frequency of VCLK: VCLK(Hz) = HCLK/[(CLKVAL+1)x2]

         * Select LCD type: TFT LCD   

         * Set display mode: 8BPP

         * Disable LCD signal output first

         * 2. LCDCON2/3/4:

         * Set the time parameters of the control signal

         * Set the resolution, i.e. the number of rows and columns

         * Now, the display frequency can be calculated according to the formula:

         * When HCLK=100MHz,

         * Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x

         *              {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x

         * {2x(CLKVAL+1)/(HCLK)}]

         *            

         * 3. LCDCON5:

         * When the display mode is set to 8BPP, the data format in the palette is: 5:6:5

         * Set the polarity of HSYNC and VSYNC pulses (this needs to refer to the specific LCD interface signal): Invert

         * Byte swap enable

         */

        LCDCON1 = (CLKVAL_TFT_480272<<8) | (LCDTYPE_TFT<<5) |

                  (BPPMODE_8BPP<<1) | (ENVID_DISABLE<<0);

        LCDCON2 = (VBPD_480272<<24) | (LINEVAL_TFT_480272<<14) |

                  (VFPD_480272<<6) | (VSPW_480272);

        LCDCON3 = (HBPD_480272<<19) | (HOZVAL_TFT_480272<<8) | (HFPD_480272);

        LCDCON4 = HSPW_480272;

        LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) |

                  (BSWP<<1);

        /*

         * Set the LCD controller address register LCDSADDR1~3

         * The frame memory is completely consistent with the viewpoint,

         * The image data format is as follows (at 8BPP, the data in the frame buffer is the index value in the palette):

         *         |----PAGEWIDTH----|

         * y/x 0 1 2 479

         *     0   idx idx idx ... idx

         *     1   idx idx idx ... idx

         * 1. LCDSADDR1:

         * Set LCDBANK, LCDBASEU

         * 2. LCDSADDR2:

         * Set LCDBASEL: frame buffer end address A[21:1]

         * 3. LCDSADDR3:

         * OFFSIZE is equal to 0, PAGEWIDTH is equal to (480/2)

         */

        LCDSADDR1 = ((LCDFRAMEBUFFER>>22)<<21) | LOWER21BITS(LCDFRAMEBUFFER>>1);

        LCDSADDR2 = LOWER21BITS((LCDFRAMEBUFFER+

                    (LINEVAL_TFT_480272+1)*(HOZVAL_TFT_480272+1)*1)>>1);

        LCDSADDR3 = (0<<11) | (LCD_XSIZE_TFT_480272/2);

        /* Disable temporary palette register */

        TPAL = 0;

        fb_base_addr = LCDFRAMEBUFFER;

        bpp = 8;

        xsize = 480;

        ysize = 272;

        break;

    case MODE_TFT_16BIT_480272:

        /* 

         * Set the LCD controller's control registers LCDCON1~5

         * 1. LCDCON1:

         * Set the frequency of VCLK: VCLK(Hz) = HCLK/[(CLKVAL+1)x2]

         * Select LCD type: TFT LCD   

         * Set display mode: 16BPP

         * Disable LCD signal output first

         * 2. LCDCON2/3/4:

         * Set the time parameters of the control signal

         * Set the resolution, i.e. the number of rows and columns

         * Now, the display frequency can be calculated according to the formula:

         * When HCLK=100MHz,

         * Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x

         *              {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x

         * {2x(CLKVAL+1)/(HCLK)}]

         *            = 60Hz

         * 3. LCDCON5:

         * Data format when setting display mode to 16BPP: 5:6:5

         * Set the polarity of HSYNC and VSYNC pulses (this needs to refer to the specific LCD interface signal): Invert

         * Halfword (2-byte) swap enable

         */

        LCDCON1 = (CLKVAL_TFT_480272<<8) | (LCDTYPE_TFT<<5) |

                  (BPPMODE_16BPP<<1) | (ENVID_DISABLE<<0);

        LCDCON2 = (VBPD_480272<<24) | (LINEVAL_TFT_480272<<14) |

                  (VFPD_480272<<6) | (VSPW_480272);

        LCDCON3 = (HBPD_480272<<19) | (HOZVAL_TFT_480272<<8) | (HFPD_480272);

        LCDCON4 = HSPW_480272;

        LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) |

                  (HWSWP<<1);

        /*

         * Set the LCD controller address register LCDSADDR1~3

         * The frame memory is completely consistent with the viewpoint,

         * The image data format is as follows:

         *         |----PAGEWIDTH----|

         * y/x 0 1 2 479

         *     0   rgb rgb rgb ... rgb

         *     1   rgb rgb rgb ... rgb

         * 1. LCDSADDR1:

         * Set LCDBANK, LCDBASEU

         * 2. LCDSADDR2:

         * Set LCDBASEL: frame buffer end address A[21:1]

         * 3. LCDSADDR3:

         * OFFSIZE is equal to 0, PAGEWIDTH is equal to (480*2/2)

         */

        LCDSADDR1 = ((LCDFRAMEBUFFER>>22)<<21) | LOWER21BITS(LCDFRAMEBUFFER>>1);

        LCDSADDR2 = LOWER21BITS((LCDFRAMEBUFFER+

                    (LINEVAL_TFT_480272+1)*(HOZVAL_TFT_480272+1)*2)>>1);

        LCDSADDR3 = (0<<11) | (LCD_XSIZE_TFT_480272*2/2);

        /* Disable temporary palette register */

        TPAL = 0;

        fb_base_addr = LCDFRAMEBUFFER;

        bpp = 16;

        xsize = 480;

        ysize = 272;

        break;

    case MODE_TFT_8BIT_640480:

        /* 

         * Set the LCD controller's control registers LCDCON1~5

         * 1. LCDCON1:

         * Set the frequency of VCLK: VCLK(Hz) = HCLK/[(CLKVAL+1)x2]

         * Select LCD type: TFT LCD   

         * Set display mode: 8BPP

         * Disable LCD signal output first

         * 2. LCDCON2/3/4:

         * Set the time parameters of the control signal

         * Set the resolution, i.e. the number of rows and columns

         * Now, the display frequency can be calculated according to the formula:

         * When HCLK=100MHz,

         * Frame Rate = 1/[{(VSPW+1)+(VBPD+1)+(LIINEVAL+1)+(VFPD+1)}x

         *              {(HSPW+1)+(HBPD+1)+(HFPD+1)+(HOZVAL+1)}x

         * {2x(CLKVAL+1)/(HCLK)}]

         *            = 60Hz

         * 3. LCDCON5:

         * When the display mode is set to 8BPP, the data format in the palette is: 5:6:5

         * Set the polarity of HSYNC and VSYNC pulses (this needs to refer to the specific LCD interface signal): Invert

         * Byte swap enable

         */

        LCDCON1 = (CLKVAL_TFT_640480<<8) | (LCDTYPE_TFT<<5) |

                  (BPPMODE_8BPP<<1) | (ENVID_DISABLE<<0);

        LCDCON2 = (VBPD_640480<<24) | (LINEVAL_TFT_640480<<14) |

                  (VFPD_640480<<6) | (VSPW_640480);

        LCDCON3 = (HBPD_640480<<19) | (HOZVAL_TFT_640480<<8) | (HFPD_640480);

        LCDCON4 = HSPW_640480;

        LCDCON5 = (FORMAT8BPP_565<<11) | (HSYNC_INV<<9) | (VSYNC_INV<<8) |

                  (BSWP<<1);

        /*

         * Set the LCD controller address register LCDSADDR1~3