UM0851 datasheet(197/245 Pages) STMICROELECTRONICS

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UM0851

Audio/video drivers

Doc ID 16604 Rev 2

197/245

fbfd = open("/dev/fb0", O_RDWR);

/* Open the file for reading and

writing */

ioctl(fbfd, FBIOGET_FSCREENINFO, &finfo)

/* Get fixed screen information */

ioctl(fbfd, FBIOGET_VSCREENINFO, &vinfo)

/* Get variable screen information */

vinfo.activate |= FB_ACTIVATE_FORCE | FB_ACTIVATE_NOW;

ioctl(fbfd, FBIOPUT_VSCREENINFO, &vinfo)

/* Put variable screen information to

Switch ON CLCD Panel */

screensize = vinfo.xres * vinfo.yres * vinfo.bits_per_pixel / 8; /* Figure out the

size of the screen in bytes */

/* Map the device to memory */

fbp = (char *)mmap( 0, screensize, PROT_READ | PROT_WRITE, MAP_SHARED, fbfd, 0 );

/*Loop will draw 3 color bands: blue, green and red */

for ( location = 0, y = 0; y < vinfo.yres; y++ )

for ( x = 0; x < vinfo.xres; x++ ) {

if ( y < (vinfo.yres/3)

)

{

*(fbp + location)

= 0xFF;/*show Blue */

*(fbp + location+1) = 0;

/*no Green*/

*(fbp + location+2) = 0;

/*no Red */

*(fbp + location+3) = 0;

/*No Transparency */

}

else if ( y < (2*vinfo.yres/3)

)

{

*(fbp + location) = 0xFF;/* no Blue */

*(fbp + location + 1) = 0;/* show Green */

*(fbp + location + 2) = 0;/* no Red */

*(fbp + location + 3) = 0;/* No transparency */

}

else {

*(fbp + location)

= 0;/* no Blue */

*(fbp + location + 1) = 0;

/* no Green */

*(fbp + location + 2) = 0xFF;/* show Red */

*(fbp + location + 3) = 0;/* No transparency */

}

location +=4;

}

Note:

The CLCD controller is connected to DDR through port of MPMC (DDR controller). The

priority of the MPMC ports can be tuned by Xloader. A low proirity for port of CLCD can

cause a slow performance hence resulting in flickering on the CLCD panel. Therefore,

currently Xloader sets the highest priority for the CLCD port.

8.1.6

Kernel configuration options

Table 51.

CLCD configuration options

Configuration option

Comment

CONFIG_FB

This option is used to enable the framebuffer

Driver support

CONFIG_FB_ARMCLCD

This framebuffer device driver is for the ARM

PrimeCell PL110 Colour LCD controller.

CONFIG_FB_ARMCLCD_SAMSUNG_LMS700

This option selects the Samsung 7" panel.

CONFIG_FB_ARMCLCD_SHARP_LQ043T1DG01

This option selects the Sharp 4.3" panel.

CONFIG_FB_CFB_FILLRECT

This option includes the cfb_fillrect function

for generic software rectangle filling.

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