[Ipodlinux-devel] LCD controller

[Jean-Charles T. <jea...@rd...>]

Hi all,

I'am trying to access to the LCD directly by its controller. Thanks to 
the framebuffer source file i understood how to write a pixel with the 
0x12 command. But now my problem is to read a value of a pixel?  It is 
also the command 0x12, but where I read the value in the CGRAM pointed 
by my cursor??? I can't find this information in the documentation.

I send you my code which draw a pixel.

void drawPixel( int x, int y, int color){
	unsigned short cursor_pos;
	unsigned data_lo, data_hi, data, mask;
	
	cursor_pos = (x/8) + (y * 0x20); //

	/* move the cursor */
	lcd_cmd_and_data(0x11, cursor_pos >> 8, cursor_pos & 0xff);	

	/* setup for printing */
	lcd_prepare_cmd(0x12);	


	data = color;
	data = data << ((x%4)*2);

	//Here is the problem!!! I know that my value of data_lo and data_hi 
are false
	lcd_wait_write();
	data_lo = inl(0xc0001010);
	lcd_wait_write();
	data_hi = inl(0xc0001010);
	
	mask = 0x03;
	mask = mask << ((x%4)*2);
	mask = ~mask;

	if (x%8<4){
		data_lo &= mask;
		data_lo |= data;	
	}
	else{
		data_hi &= mask;
		data_hi |= data;
	}
	lcd_send_data( data_hi, data_lo);
}

If anyone have an idea.....

thanks,
jean-charles.