S5PV210(TQ210)学习笔记——LCD驱动编写

嵌入式系统 时间：2016-11-28来源：网络
网上S5PV210内核移植的文章不是很多，而描述2440和6410内核移植的文章多数是讲如何移植，而非手动编写，但是，韦东山老师的视频中讲述了如何从头编写LCD驱动，当然是以2440为例的，我看过视频之后在TQ210平台上进行了实验，实验成功，详细的原理部分以我现在的水平还难以表达清楚。下载是我自己写的代码，适用于TQ210的7寸电容屏。
  1. #include
  2. #include
  3. #include
  4. #include
  7. staticstructfb_info*lcd_info;
  8. unsignedlongpseudo_palette[16];
  10. unsignedlong*display_control;
  12. volatileunsignedlong*gpf0con;
  13. volatileunsignedlong*gpf1con;
  14. volatileunsignedlong*gpf2con;
  15. volatileunsignedlong*gpf3con;
  16. volatileunsignedlong*gpd0con;
  17. volatileunsignedlong*gpd0dat;
  18. volatileunsignedlong*vidcon0;
  19. volatileunsignedlong*vidcon1;
  20. volatileunsignedlong*vidtcon0;
  21. volatileunsignedlong*vidtcon1;
  22. volatileunsignedlong*vidtcon2;
  23. volatileunsignedlong*wincon0;
  24. volatileunsignedlong*vidosd0a;
  25. volatileunsignedlong*vidosd0b;
  26. volatileunsignedlong*vidosd0c;
  27. volatileunsignedlong*vidw00add0b0;
  28. volatileunsignedlong*vidw00add1b0;
  29. volatileunsignedlong*shodowcon;
  31. structclk*lcd_clk;
  34. staticinlineunsignedintchan_to_field(unsignedintchan,structfb_bitfield*bf)
  35. {
  36. chan&=0xffff;
  37. chan>>=16-bf->length;
  38. returnchan<offset;
  39. }
  41. staticintlcdfb_setcolreg(unsignedintregno,unsignedintred,
  42. unsignedintgreen,unsignedintblue,
  43. unsignedinttransp,structfb_info*info)
  44. {
  45. unsignedintval;
  47. if(regno>16)
  48. return1;
  50. /*用red,green,blue三原色构造出val*/
  51. val=chan_to_field(red,&info->var.red);
  52. val|=chan_to_field(green,&info->var.green);
  53. val|=chan_to_field(blue,&info->var.blue);
  55. //((u32*)(info->pseudo_palette))[regno]=val;
  56. pseudo_palette[regno]=val;
  57. return0;
  58. }
  60. staticstructfb_opslcd_fbops={
  61. .owner=THIS_MODULE,
  62. .fb_setcolreg=lcdfb_setcolreg,
  63. .fb_fillrect=cfb_fillrect,
  64. .fb_copyarea=cfb_copyarea,
  65. .fb_imageblit=cfb_imageblit,
  66. };
  68. staticintlcd_init(void){
  69. intret;
  71. /*分配fb_info*/
  72. lcd_info=framebuffer_alloc(0,NULL);
  73. if(lcd_info==NULL){
  74. printk(KERN_ERR"allocframebufferfailed!");
  75. return-ENOMEM;
  76. }
  78. /*配置fb_info各成员*/
  79. /*fix*/
  80. strcpy(lcd_info->fix.id,"s5pv210_lcd");
  81. lcd_info->fix.smem_len=800*480*4;
  82. lcd_info->fix.type=FB_TYPE_PACKED_PIXELS;
  83. lcd_info->fix.visual=FB_VISUAL_TRUECOLOR;
  84. lcd_info->fix.line_length=800*4;
  86. /*var*/
  87. lcd_info->var.xres=800;
  88. lcd_info->var.yres=480;
  89. lcd_info->var.xres_virtual=800;
  90. lcd_info->var.yres_virtual=480;
  91. lcd_info->var.bits_per_pixel=32;
  93. lcd_info->var.red.offset=16;
  94. lcd_info->var.red.length=8;
  95. lcd_info->var.green.offset=8;
  96. lcd_info->var.green.length=8;
  97. lcd_info->var.blue.offset=0;
  98. lcd_info->var.blue.length=8;
  99. lcd_info->var.activate=FB_ACTIVATE_NOW;
  100. 1 2 3

    关键词： S5PV210LCD驱动编

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