AN2641 datasheet(21/37 Pages) STMICROELECTRONICS

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AN2641

Linux frame buffer

Doc ID 14027 Rev 1

21/37

Step-by-step procedure:

The file 'arch/arm/mach-spear300/spear300.c' (or 'arch/arm/mach-

spearbasic/spearbasic.c') fills the clcd_panel structure with all the information about

CLCD.

Figure 7.

CLCD panel structure

The 'clcd_panel' structure has 4 important members: tim2 (corresponding to LCD-

Timing register 2), tim3 (corresponding to LCD-Timing register 3), cntl (corresponding

to LCD-Control register) and bpp (bits per pixel).

The 'mode' field (structure 'fb_videomode') of structure 'clcd_panel' has the kind of

information (panel resolution and margins) which needs to be filled in LCD-timing

Return the appropriate CLCD panel structure by filling in the following function:

Figure 8.

Return CLCD panel structure

Note the usage of macros like CONFIG_FB_ARMCLCD_SHARP_LQ043T1DG01.

They are defined in 'drivers/video/Kconfig', the file which defines the choices in the

menuconfig.

#ifdef CONFIG_FB_ARMCLCD_SHARP_LQ043T1DG01

static struct clcd_panel sharp_LQ043T1DG01_in = {

.mode

= {

.name

= "Sharp LQ043T1DG01",

.refresh

= 0,

.xres

= 480,

.yres

= 272,

.pixclock

= 48000,

.left_margin = 2,

.right_margin = 2,

.upper_margin = 2,

.lower_margin = 2,

.hsync_len

= 41,

.vsync_len

= 11,

.sync

= 0, //FB_SYNC_HOR_HIGH_ACT |

.vmode

= FB_VMODE_NONINTERLACED,

.width

= -1,

.height

= -1,

.tim2

= TIM2_IOE | TIM2_CLKSEL | 3, //TIM2_CLKSEL| 4,

.cntl

= CNTL_LCDTFT | CNTL_BGR,

.bpp

= 32,

};

#endif

{

Struct clcd_panel *panel;

#ifdef CONFIG_FB_ARMCLCD_SHARP_LQ043T1DG01

Panel = &sharp_LQ043T1DG01_in;

#endif

Return panel;

}

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