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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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AN2641 데이터시트(PDF) 23 Page - STMicroelectronics |
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AN2641 데이터시트(HTML) 23 Page - STMicroelectronics |
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23 / 37 page  AN2641 Linux frame buffer Doc ID 14027 Rev 1 23/37 Figure 11. CLCD selection from menu config - 2 6.3 User level perspective of CLCD As we already know, a frame buffer device is a memory device like /dev/mem and it has the same features. You can read it, write it, seek to some location in it and mmap() it (the main usage). The difference is just that the memory that appears in the special file is not the whole memory, but the frame buffer of the video hardware. 6.3.1 Data structures for user level It is essential to understand the following three structures, they are used by all frame buffer user applications. 1. Variable information pertaining to the video card is held in struct fb_var_screeninfo. This structure contains fields such as the X-resolution, Y-resolution, bits required to |
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