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AN2641 데이터시트(PDF) 25 Page - STMicroelectronics

부품명 AN2641
상세설명  Using the color LCD controller
PDF  37 Pages
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제조업체  STMICROELECTRONICS [STMicroelectronics]
홈페이지  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2641 데이터시트(HTML) 25 Page - STMicroelectronics

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AN2641
Linux frame buffer
Doc ID 14027 Rev 1
25/37
6.3.2
User level application sample
The Figure 15 shows a simple user application that works over the frame buffer API. The
program shows 3 color bands on the screen by operating on /dev/fb0, the frame buffer
device node corresponding to the display.
After opening the frame buffer device node the program gets the fixed screen and variable
screen information. It first deciphers the visible resolutions and the bits per pixel in a
hardware-independent manner using the frame buffer ioctl FBIOGET_VSCREENINFO. This
interface command gleans the display's variable parameters by operating on the
'fb_var_screeninfo' structure.
The command FB_ACTIVATE_FORCE (while put variable screen information) enables the
CLCD. This line is important to activate the CLCD.
The program then goes on to mmap() the frame buffer memory and writes color data on
each constituent pixel bit.



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