linux的lcd驅(qū)動詳細(xì)講解培訓(xùn)講學(xué)

1、Good is good, but better carries it.精益求精，善益求善。linux的lcd驅(qū)動詳細(xì)講解-嵌入式驅(qū)動程序Day12HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlTopHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmllcase1LCD驅(qū)動設(shè)計開發(fā)1LCD驅(qū)動設(shè)計開發(fā)1.1問題通過lcd驅(qū)動開發(fā)掌握linux內(nèi)核framebuffer驅(qū)動開發(fā)通用方法。1.2方案一、

2、幀緩沖（Framebuffer）。幀緩沖（Framebuffer）是Linux為顯示設(shè)備提供的一個接口，Linux抽象出FrameBuffer這個設(shè)備來供用戶態(tài)進(jìn)程實現(xiàn)直接寫屏。Framebuffer機制模仿顯卡的功能，將顯卡硬件結(jié)構(gòu)抽象掉，可以通過Framebuffer的讀寫直接對顯存進(jìn)行操作。用戶可以將Framebuffer看成是顯示內(nèi)存的一個映像，將其映射到進(jìn)程地址空間之后，就可以直接進(jìn)行讀寫操作，而寫操作可以立即反應(yīng)在屏幕上。這種操作是抽象的，統(tǒng)一的。用戶不必關(guān)心物理顯存的位置、換頁機制等等具體細(xì)節(jié)。這些都是由Framebuffer設(shè)備驅(qū)動來完成的。Framebuffer本身不具備任何

3、運算數(shù)據(jù)的能力,就只好比是一個暫時存放水的水池。CPU將運算后的結(jié)果放到這個水池，水池再將結(jié)果流到顯示器，中間不會對數(shù)據(jù)做處理。應(yīng)用程序也可以直接讀寫這個水池的內(nèi)容。在應(yīng)用程序中，一般通過將FrameBuffer設(shè)備映射到進(jìn)程地址空間的方式使用，比如下面的程序就打開/dev/fb0設(shè)備，并通過mmap系統(tǒng)調(diào)用進(jìn)行地址映射。FrameBuffer設(shè)備還提供了若干ioctl命令，通過這些命令，可以獲得顯示設(shè)備的一些固定信息（比如顯示內(nèi)存大?。?、與顯示模式相關(guān)的可變信息（比如分辨率、象素結(jié)構(gòu)、每掃描線的字節(jié)寬度），以及偽彩色模式下的調(diào)色板信息等等。二、FrameBuffer在Linux中的實現(xiàn)和機制

4、。Framebuffer對應(yīng)的源文件在linux/drivers/video/目錄下?？偟某橄笤O(shè)備文件為fbcon.c，在這個目錄下還有與各種顯卡驅(qū)動相關(guān)的源文件。1.分析Framebuffer設(shè)備驅(qū)動。FrameBuffer設(shè)備驅(qū)動基于如下兩個文件：（1）linux/include/linux/fb.h（2）linux/drivers/video/fbmem.c2.分析這兩個文件。（1）fb.h。幾乎主要的結(jié)構(gòu)都是在這個中文件定義的。這些結(jié)構(gòu)包括：1）fb_var_screeninfo結(jié)構(gòu)體。這個結(jié)構(gòu)描述了顯示卡的特性：_u32是表示unsigned不帶符號的32bits的數(shù)據(jù)類型，其余類推

5、。這是Linux內(nèi)核中所用到的數(shù)據(jù)類型，如果是開發(fā)用戶空間（user-space）的程序，可以根據(jù)具體計算機平臺的情況，用unsignedlong等等來代替。structfb_var_screeninfo_u32xres;/可視區(qū)域_u32yres;_u32xres_virtual;/可視區(qū)域_u32yres_virtual;_u32xoffset;/可視區(qū)域的偏移_u32yoffset;_u32bits_per_pixel;/每一象素的bit數(shù)_u32grayscale;/等于零就成黑白structfb_bitfieldred;structfb_bitfieldgreen;/*elseonl

6、ylengthissignificant*/structfb_bitfieldblue;structfb_bitfieldtransp;/透明_u32nonstd;/不是標(biāo)準(zhǔn)格式_u32activate;/*seeFB_ACTIVATE_*/_u32height;/內(nèi)存中的圖像高度_u32width;/內(nèi)存中的圖像寬度_u32accel_flags;/加速標(biāo)志/時序-_-這些部分就是顯示器的顯示方法_u32pixclock;/*pixelclockinps(picoseconds)*/_u32left_margin;/*timefromsynctopicture*/_u32right_marg

7、in;/*timefrompicturetosync*/_u32upper_margin;/*timefromsynctopicture*/_u32lower_margin;_u32hsync_len;/*lengthofhorizontalsync*/水平可視區(qū)域_u32vsync_len;/*lengthofverticalsync*/垂直可視區(qū)域_u32sync;/*seeFB_SYNC_*/_u32vmode;/*seeFB_VMODE_*/_u32reserved6;/備用以后開發(fā);2)fb_fix_screeninfon結(jié)構(gòu)體。這個結(jié)構(gòu)在顯卡被設(shè)定模式后創(chuàng)建，它描述顯示卡的屬性，并

8、且系統(tǒng)運行時不能被修改；比如FrameBuffer內(nèi)存的起始地址。它依賴于被設(shè)定的模式，當(dāng)一個模式被設(shè)定后，內(nèi)存信息由顯示卡硬件給出，內(nèi)存的位置等信息就不可以修改。structfb_fix_screeninfocharid16;/*identificationstringegTTBuiltin*/IDunsignedlongsmem_start;/*Startofframebuffermem*/內(nèi)存起始/*(physicaladdress)*/物理地址_u32smem_len;/*Lengthofframebuffermem*/內(nèi)存大小_u32type;/*seeFB_TYPE_*/_u32t

9、ype_aux;/*InterleaveforinterleavedPlanes*/插入?yún)^(qū)域？_u32visual;/*seeFB_VISUAL_*/_u16xpanstep;/沒有硬件設(shè)備就為零_u16ypanstep;/*zeroifnohardwarepanning*/_u16ywrapstep;/*zeroifnohardwareywrap*/_u32line_length;/一行的字節(jié)表示unsignedlongmmio_start;/內(nèi)存映射的I/O起始/*(physicaladdress)*/_u32mmio_len;/I/O的大小_u32accel;/*Typeofaccele

10、rationavailable*/可用的加速類型_u16reserved3;/*Reservedforfuturecompatibility*/;3)fb_cmap結(jié)構(gòu)體。描述設(shè)備無關(guān)的顏色映射信息?？梢酝ㄟ^FBIOGETCMAP和FBIOPUTCMAP對應(yīng)的ioctl操作設(shè)定或獲取顏色映射信息。structfb_cmap_u32start;/*Firstentry*/第一個入口_u32len;/*Numberofentries*/入口的數(shù)字_u16*red;/*Redvalues*/紅_u16*green;_u16*blue;_u16*transp;/*transparency,canbeN

11、ULL*/透明，可以為零;4)fb_info結(jié)構(gòu)體。定義當(dāng)顯卡的當(dāng)前狀態(tài)；fb_info結(jié)構(gòu)僅在內(nèi)核中可見，在這個結(jié)構(gòu)中有一個fb_ops指針，指向驅(qū)動設(shè)備工作所需的函數(shù)集。structfb_infocharmodename40;/默認(rèn)的視頻卡類型kdev_tnode;intflags;intopen;/被打開過么？#defineFBINFO_FLAG_MODULE1/*Low-leveldriverisamodule*/structfb_var_screeninfovar;/現(xiàn)在的視頻信息structfb_fix_screeninfofix;/修正的信息structfb_monspecsmo

12、nspecs;/現(xiàn)在的顯示器模式structfb_cmapcmap;/當(dāng)前優(yōu)先級structfb_ops*fbops;char*screen_base;/物理基址structdisplay*disp;/初始化structvc_data*display_fg;/*Consolevisibleonthisdisplay*/charfontname40;/默認(rèn)的字體devfs_handle_tdevfs_handle;/*Devfshandlefornewname*/devfs_handle_tdevfs_lhandle;/兼容int(*changevar)(int);/告訴console變量修改了

13、int(*switch_con)(int,structfb_info*);/告訴fb選擇consolesint(*updatevar)(int,structfb_info*);/*tellfbtoupdatethevars*/告訴fb更新變量void(*blank)(int,structfb_info*);/*tellfbto(un)blankthescreen*/告訴fb使用黑白模式（或者不黑）/*arg=0:unblank*/arg0的時候黑白模式/*arg0:VESAlevel(arg-1)*/arg0時候選擇VESA模式void*pseudo_palette;/*Fakepalette

14、of16colorsandthecursorscolorfornonpalettemode*/修正調(diào)色板/*Fromhereoneverythingisdevicedependent*/現(xiàn)在就可以使用了void*par;5)structfb_ops結(jié)構(gòu)體。用戶應(yīng)用可以使用ioctl()系統(tǒng)調(diào)用來操作設(shè)備，這個結(jié)構(gòu)就是用一支持ioctl()的這些操作的。structfb_ops/*open/releaseandusagemarking*/structmodule*owner;int(*fb_open)(structfb_info*info,intuser);int(*fb_release)(st

15、ructfb_info*info,intuser);/*getnonsettableparameters*/int(*fb_get_fix)(structfb_fix_screeninfo*fix,intcon,structfb_info*info);/*getsettableparameters*/int(*fb_get_var)(structfb_var_screeninfo*var,intcon,structfb_info*info);/*setsettableparameters*/int(*fb_set_var)(structfb_var_screeninfo*var,intcon,

16、structfb_info*info);/*getcolormap*/int(*fb_get_cmap)(structfb_cmap*cmap,intkspc,intcon,structfb_info*info);/*setcolormap*/int(*fb_set_cmap)(structfb_cmap*cmap,intkspc,intcon,structfb_info*info);/*pandisplay(optional)*/int(*fb_pan_display)(structfb_var_screeninfo*var,intcon,structfb_info*info);/*perf

17、ormfbspecificioctl(optional)*/int(*fb_ioctl)(structinode*inode,structfile*file,unsignedintcmd,unsignedlongarg,intcon,structfb_info*info);/*performfbspecificmmap*/int(*fb_mmap)(structfb_info*info,structfile*file,structvm_area_struct*vma);/*switchto/fromrasterimagemode*/int(*fb_rasterimg)(structfb_inf

18、o*info,intstart);（2）fbmem.c。fbmem.c處于Framebuffer設(shè)備驅(qū)動技術(shù)的中心位置。它為上層應(yīng)用程序提供系統(tǒng)調(diào)用也為下一層的特定硬件驅(qū)動提供接口；那些底層硬件驅(qū)動需要用到這兒的接口來向系統(tǒng)內(nèi)核注冊它們自己。fbmem.c為所有支持FrameBuffer的設(shè)備驅(qū)動提供了通用的接口，避免重復(fù)工作。1)全局變量。structfb_info*registered_fbFB_MAX;intnum_registered_fb;這兩變量記錄了所有fb_info結(jié)構(gòu)的實例，fb_info結(jié)構(gòu)描述顯卡的當(dāng)前狀態(tài)，所有設(shè)備對應(yīng)的fb_info結(jié)構(gòu)都保存在這個數(shù)組中，當(dāng)一個Fra

19、meBuffer設(shè)備驅(qū)動向系統(tǒng)注冊自己時，其對應(yīng)的fb_info結(jié)構(gòu)就會添加到這個結(jié)構(gòu)中，同時num_registered_fb為自動加1。staticstructconstchar*name;int(*init)(void);int(*setup)(void);fb_drivers_initdata=.;如果FrameBuffer設(shè)備被靜態(tài)鏈接到內(nèi)核，其對應(yīng)的入口就會添加到這個表中；如果是動態(tài)加載的，即使用insmod/rmmod，就不需要關(guān)心這個表。staticstructfile_operationsfb_ops=owner:THIS_MODULE,read:fb_read,write:

20、fb_write,ioctl:fb_ioctl,mmap:fb_mmap,open:fb_open,release:fb_release;這是一個提供給應(yīng)用程序的接口。2）fbmem.c實現(xiàn)了如下函數(shù)。Register_framebuffer(structfb_info*fb_info);unregister_framebuffer(structfb_info*fb_info);這兩個是提供給下層FrameBuffer設(shè)備驅(qū)動的接口，設(shè)備驅(qū)動通過這兩函數(shù)向系統(tǒng)注冊或注銷自己。幾乎底層設(shè)備驅(qū)動所要做的所有事情就是填充fb_info結(jié)構(gòu)然后向系統(tǒng)注冊或注銷它。三、本案例的操作步驟如下。1.修改ma

21、ch-cw210.c源文件，實現(xiàn)LCD設(shè)備的初始化。2.重新編譯內(nèi)核zImage，并將zImage拷貝到/tftpboot下。3.編寫應(yīng)用測試程序lcd_test.c。（1）定義宏和變量；HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlcopyHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmltextHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/

22、DAY12/CASE/01/index.htmlpop-up#defineCOLOR_RED0 x000000FF#defineCOLOR_GREEN0 x0000FF00#defineCOLOR_BLUE0 x00FF0000intfdfb=-1;structfb_fix_screeninfofbfix=0;structfb_var_screeninfofbvar=0;longscreensize=0;int*fb32=NULL;intx=0;inty=0;longlocation=0;#defineCOLOR_RED0 x000000FF#defineCOLOR_GREEN0 x0000F

23、F00#defineCOLOR_BLUE0 x00FF0000intfdfb=-1;structfb_fix_screeninfofbfix=0;structfb_var_screeninfofbvar=0;longscreensize=0;int*fb32=NULL;intx=0;inty=0;longlocation=0;（2）編寫main（）函數(shù)；1）打開Framebuffer設(shè)備文件；2）使用ioctl（）系統(tǒng)調(diào)用獲取幀緩沖設(shè)備中設(shè)備無關(guān)的固定參數(shù)信息；3）使用ioctl（）系統(tǒng)調(diào)用獲取幀緩沖設(shè)備中設(shè)備無關(guān)的可變參數(shù)信息和特定的顯示模式；4）計算顯示屏幕上所有點需要的字節(jié)數(shù)，字節(jié)數(shù)等于

24、分辨率*每個點占據(jù)的字節(jié)數(shù)；5）使用函數(shù)mmap（）將Framebuffer的顯存映射到用戶空間，使得用戶空間可以直接進(jìn)行讀寫操作；6）根據(jù)色深，操作顯存，在LCD屏上繪制紅色、綠色、藍(lán)色三個區(qū)域；7）使用函數(shù)munmap（）解除對顯存的映射；8）關(guān)閉Framebuffer設(shè)備。4.編寫Makefile文件。5.編譯LCD驅(qū)動模塊，并將生成的lcd_test文件拷貝到指定目錄下。6.在TPAD的運行終端上運行應(yīng)用測試程序，測試驅(qū)動程序。1.3實現(xiàn)1.修改mach-cw210.c源文件，實現(xiàn)LCD設(shè)備的初始化。修改/home/tarena/workdir/tools/cw210_kernel_/

25、arch/arm/mach-s5pv210/目錄下的mach-cw210.c源文件。HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlcopyHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmltextHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlpop-up$cd/home/tarena/workdi

26、r/tools/cw210_kernel_/arch/arm/mach-s5pv210/$vimach-cw210.c$cd/home/tarena/workdir/tools/cw210_kernel_/arch/arm/mach-s5pv210/$vimach-cw210.c添加源代碼如下：HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlcopyHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.html

27、textHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlpop-up#elifdefined(CONFIG_FB_AT070TN92)staticstructs3cfb_lcdlte480wv=.width=800,.height=480,.bpp=24,.freq=28,.clkval_f=6,/3/27,/HBPD/14,/HFPD/20,/10,/HSPW.timing=.h_fp=14,/210,.h_bp=27,/16,.h_sw=20,/30,.v_fp=22,.v_fpe=1,.v

28、_bp=10,.v_bpe=1,.v_sw=13,.polarity=.rise_vclk=0,.inv_hsync=1,.inv_vsync=1,.inv_vden=0,;staticvoidlte480wv_cfg_gpio(structplatform_device*pdev)inti;for(i=0;i8;i+)s3c_gpio_cfgpin(S5PV210_GPF0(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF0(i),S3C_GPIO_PULL_NONE);for(i=0;i8;i+)s3c_gpio_cfgpin(S5PV210_

29、GPF1(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF1(i),S3C_GPIO_PULL_NONE);for(i=0;i8;i+)s3c_gpio_cfgpin(S5PV210_GPF2(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF2(i),S3C_GPIO_PULL_NONE);for(i=0;i4;i+)s3c_gpio_cfgpin(S5PV210_GPF3(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF3(i),S3C_GPIO_PULL

30、_NONE);/*mDNIeSEL:whyweshallwrite0 x2?*/writel(0 x2,S5P_MDNIE_SEL);/*drivestrengthtomax*/writel(0 xffffffff,S5PV210_GPF0_BASE+0 xc);writel(0 xffffffff,S5PV210_GPF1_BASE+0 xc);writel(0 xffffffff,S5PV210_GPF2_BASE+0 xc);writel(0 x000000ff,S5PV210_GPF3_BASE+0 xc);staticintlte480wv_backlight_on(structpl

31、atform_device*pdev)interr;err=gpio_request(S5PV210_GPD0(0),GPD0);if(err)printk(KERN_ERRfailedtorequestGPD0forlcdbacklightcontroln);returnerr;gpio_direction_output(S5PV210_GPD0(0),1);#ifdefined(CONFIG_FB_S3C_VGA640480)|defined(CONFIG_FB_AT070TN92)|defined(CONFIG_FB_S3C_VGA800600)s3c_gpio_cfgpin(S5PV2

32、10_GPD0(0),/*S5PV210_GPD_0_0_TOUT_0*/1);#elses3c_gpio_cfgpin(S5PV210_GPD0(0),S5PV210_GPD_0_0_TOUT_0);#endifgpio_free(S5PV210_GPD0(0);return0;staticintlte480wv_backlight_off(structplatform_device*pdev,intonoff)interr;err=gpio_request(S5PV210_GPD0(0),GPD0);if(err)printk(KERN_ERRfailedtorequestGPD0forl

33、cdbacklightcontroln);returnerr;gpio_direction_output(S5PV210_GPD0(0),1);#ifdefined(CONFIG_FB_S3C_VGA640480)|defined(CONFIG_FB_AT070TN92)|defined(CONFIG_FB_S3C_VGA800600)s3c_gpio_cfgpin(S5PV210_GPD0(0),/*S5PV210_GPD_0_0_TOUT_0*/1);#elses3c_gpio_cfgpin(S5PV210_GPD0(0),S5PV210_GPD_0_0_TOUT_0);#endifgpi

34、o_free(S5PV210_GPD0(0);return0;staticintlte480wv_backlight_off(structplatform_device*pdev,intonoff)interr;err=gpio_request(S5PV210_GPD0(0),GPD0);if(err)printk(KERN_ERRfailedtorequestGPD0forlcdbacklightcontroln);returnerr;gpio_direction_output(S5PV210_GPD0(0),0);gpio_free(S5PV210_GPD0(0);return0;stat

35、icintlte480wv_reset_lcd(structplatform_device*pdev)return0;staticstructs3c_platform_fblte480wv_fb_data_initdata=.hw_ver=0 x62,.nr_wins=5,.default_win=CONFIG_FB_S3C_DEFAULT_WINDOW,.swap=FB_SWAP_WORD|FB_SWAP_HWORD,.lcd=<e480wv,.cfg_gpio=lte480wv_cfg_gpio,.backlight_on=lte480wv_backlight_on,.backligh

36、t_onoff=lte480wv_backlight_off,.reset_lcd=lte480wv_reset_lcd,;staticvoid_initsmdkc110_machine_init(void)s3cfb_set_platdata(<e480wv_fb_data);#elifdefined(CONFIG_FB_AT070TN92)staticstructs3cfb_lcdlte480wv=.width=800,.height=480,.bpp=24,.freq=28,.clkval_f=6,/3/27,/HBPD/14,/HFPD/20,/10,/HSPW.timing=.h

37、_fp=14,/210,.h_bp=27,/16,.h_sw=20,/30,.v_fp=22,.v_fpe=1,.v_bp=10,.v_bpe=1,.v_sw=13,.polarity=.rise_vclk=0,.inv_hsync=1,.inv_vsync=1,.inv_vden=0,;staticvoidlte480wv_cfg_gpio(structplatform_device*pdev)inti;for(i=0;i8;i+)s3c_gpio_cfgpin(S5PV210_GPF0(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF0(i),

38、S3C_GPIO_PULL_NONE);for(i=0;i8;i+)s3c_gpio_cfgpin(S5PV210_GPF1(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF1(i),S3C_GPIO_PULL_NONE);for(i=0;i8;i+)s3c_gpio_cfgpin(S5PV210_GPF2(i),S3C_GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF2(i),S3C_GPIO_PULL_NONE);for(i=0;i4;i+)s3c_gpio_cfgpin(S5PV210_GPF3(i),S3C_

39、GPIO_SFN(2);s3c_gpio_setpull(S5PV210_GPF3(i),S3C_GPIO_PULL_NONE);/*mDNIeSEL:whyweshallwrite0 x2?*/writel(0 x2,S5P_MDNIE_SEL);/*drivestrengthtomax*/writel(0 xffffffff,S5PV210_GPF0_BASE+0 xc);writel(0 xffffffff,S5PV210_GPF1_BASE+0 xc);writel(0 xffffffff,S5PV210_GPF2_BASE+0 xc);writel(0 x000000ff,S5PV2

40、10_GPF3_BASE+0 xc);staticintlte480wv_backlight_on(structplatform_device*pdev)interr;err=gpio_request(S5PV210_GPD0(0),GPD0);if(err)printk(KERN_ERRfailedtorequestGPD0forlcdbacklightcontroln);returnerr;gpio_direction_output(S5PV210_GPD0(0),1);#ifdefined(CONFIG_FB_S3C_VGA640480)|defined(CONFIG_FB_AT070T

41、N92)|defined(CONFIG_FB_S3C_VGA800600)s3c_gpio_cfgpin(S5PV210_GPD0(0),/*S5PV210_GPD_0_0_TOUT_0*/1);#elses3c_gpio_cfgpin(S5PV210_GPD0(0),S5PV210_GPD_0_0_TOUT_0);#endifgpio_free(S5PV210_GPD0(0);return0;staticintlte480wv_backlight_off(structplatform_device*pdev,intonoff)interr;err=gpio_request(S5PV210_G

42、PD0(0),GPD0);if(err)printk(KERN_ERRfailedtorequestGPD0forlcdbacklightcontroln);returnerr;gpio_direction_output(S5PV210_GPD0(0),1);#ifdefined(CONFIG_FB_S3C_VGA640480)|defined(CONFIG_FB_AT070TN92)|defined(CONFIG_FB_S3C_VGA800600)s3c_gpio_cfgpin(S5PV210_GPD0(0),/*S5PV210_GPD_0_0_TOUT_0*/1);#elses3c_gpi

43、o_cfgpin(S5PV210_GPD0(0),S5PV210_GPD_0_0_TOUT_0);#endifgpio_free(S5PV210_GPD0(0);return0;staticintlte480wv_backlight_off(structplatform_device*pdev,intonoff)interr;err=gpio_request(S5PV210_GPD0(0),GPD0);if(err)printk(KERN_ERRfailedtorequestGPD0forlcdbacklightcontroln);returnerr;gpio_direction_output

44、(S5PV210_GPD0(0),0);gpio_free(S5PV210_GPD0(0);return0;staticintlte480wv_reset_lcd(structplatform_device*pdev)return0;staticstructs3c_platform_fblte480wv_fb_data_initdata=.hw_ver=0 x62,.nr_wins=5,.default_win=CONFIG_FB_S3C_DEFAULT_WINDOW,.swap=FB_SWAP_WORD|FB_SWAP_HWORD,.lcd=<e480wv,.cfg_gpio=lte48

45、0wv_cfg_gpio,.backlight_on=lte480wv_backlight_on,.backlight_onoff=lte480wv_backlight_off,.reset_lcd=lte480wv_reset_lcd,;staticvoid_initsmdkc110_machine_init(void)s3cfb_set_platdata(<e480wv_fb_data);HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.html隱藏HYPERLINK/tts6materials/

46、TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.html代碼2.重新編譯內(nèi)核zImage，并將zImage拷貝到/tftpboot下。HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlcopyHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmltextHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12

47、/CASE/01/index.htmlpop-up$cd/home/tarena/workdir/tools/cw210_kernel_/$makezImage$cparch/arm/boot/zImage/tftpboot$cd/home/tarena/workdir/tools/cw210_kernel_/$makezImage$cparch/arm/boot/zImage/tftpboot3.編寫測試程序lcd_test.c編輯lcd_test.c源文件。HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/ind

48、ex.htmlcopyHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmltextHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlpop-up$vilcd_test.c$vilcd_test.clcd_test.c源代碼如下：HYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlcopyHYPERLINK/t

49、ts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmltextHYPERLINK/tts6materials/TTS6/EMBED/ESD_V01/DRIVER/DAY12/CASE/01/index.htmlpop-up#include#include#include#include#include#defineCOLOR_RED0 x000000FF#defineCOLOR_GREEN0 x0000FF00#defineCOLOR_BLUE0 x00FF0000intfdfb=-1;structfb_fix_scree

50、ninfofbfix=0;structfb_var_screeninfofbvar=0;longscreensize=0;int*fb32=NULL;intx=0;inty=0;longlocation=0;intmain(intargc,char*argv)/openframebufferdevicefdfb=open(argv1,O_RDWR);if(0fdfb)printf(Failuretoopenframebufferdevice:/dev/fb0!n);exit(-1);printf(Successtoopenframebufferdevice:/dev/fb0!n);/getfi

51、xedscreeninformationif(ioctl(fdfb,FBIOGET_FSCREENINFO,&fbfix)printf(Failuretogetfixedscreeninformation!n);exit(-2);printf(Successtogetfixedscreeninformation!n);/getvariblescreeninformationif(ioctl(fdfb,FBIOGET_VSCREENINFO,&fbvar)printf(Failuretogetvariblescreeninformation!n);exit(-3);printf(Successt

52、ogetvariblescreeninformation!n);/calculatethenumberofbytesforscreensizescreensize=fbvar.xres*fbvar.yres*(fbvar.bits_per_pixel/8);printf(sceeninfo.xres=%d,screeninfo.yres=%d,screeninfo.bits_per_pixel=%dbpp,screensize=%d!n,fbvar.xres,fbvar.yres,fbvar.bits_per_pixel,screensize);/mmapframebuffertoproces

53、smemoryspacefb32=(int*)mmap(0,screensize,PROT_READ|PROT_WRITE,MAP_SHARED,fdfb,0);if(NULL=fb32)printf(Failuretomapframebufferdevicememorytoprocesssmemory!n);exit(-4);printf(Successtomapframebufferdevicememorytoprocesssmemory!n);/drawpixelif(8=fbvar.bits_per_pixel)printf(Starting8bppframebuffertest.n)

54、;elseif(16=fbvar.bits_per_pixel)printf(Starting16bppframebuffertest.n);elseif(24=fbvar.bits_per_pixel)printf(Starting24bppframebuffertest.n);elseprintf(Supporting32bpp!n);/drawredcolorareaprintf(StartingtoshowREDarea!n);for(y=0;yfbvar.yres/3;y+)for(x=0;xfbvar.xres;x+)*(fb32+y*fbvar.xres+x)=COLOR_RED

55、;/drawgreencolorareaprintf(StartingtoshowGREENarea!n);for(y=(fbvar.yres/3);y(fbvar.yres*2/3);y+)for(x=0;xfbvar.xres;x+)*(fb32+y*fbvar.xres+x)=COLOR_GREEN;/drawbluecolorareaprintf(StartingtoshowBLUEarea!n);for(y=(fbvar.yres*2/3);yfbvar.yres;y+)for(x=0;xfbvar.xres;x+)*(fb32+y*fbvar.xres+x)=COLOR_BLUE;

56、/unmapframebuffermemorymunmap(fb32,screensize);printf(Finishedtodemotooperateframebuffer!n);/closedevicehandleclose(fdfb);return0;#include#include#include#include#include#defineCOLOR_RED0 x000000FF#defineCOLOR_GREEN0 x0000FF00#defineCOLOR_BLUE0 x00FF0000intfdfb=-1;structfb_fix_screeninfofbfix=0;stru

57、ctfb_var_screeninfofbvar=0;longscreensize=0;int*fb32=NULL;intx=0;inty=0;longlocation=0;intmain(intargc,char*argv)/openframebufferdevicefdfb=open(argv1,O_RDWR);if(0fdfb)printf(Failuretoopenframebufferdevice:/dev/fb0!n);exit(-1);printf(Successtoopenframebufferdevice:/dev/fb0!n);/getfixedscreeninformat

58、ionif(ioctl(fdfb,FBIOGET_FSCREENINFO,&fbfix)printf(Failuretogetfixedscreeninformation!n);exit(-2);printf(Successtogetfixedscreeninformation!n);/getvariblescreeninformationif(ioctl(fdfb,FBIOGET_VSCREENINFO,&fbvar)printf(Failuretogetvariblescreeninformation!n);exit(-3);printf(Successtogetvariblescreen

59、information!n);/calculatethenumberofbytesforscreensizescreensize=fbvar.xres*fbvar.yres*(fbvar.bits_per_pixel/8);printf(sceeninfo.xres=%d,screeninfo.yres=%d,screeninfo.bits_per_pixel=%dbpp,screensize=%d!n,fbvar.xres,fbvar.yres,fbvar.bits_per_pixel,screensize);/mmapframebuffertoprocessmemoryspacefb32=

60、(int*)mmap(0,screensize,PROT_READ|PROT_WRITE,MAP_SHARED,fdfb,0);if(NULL=fb32)printf(Failuretomapframebufferdevicememorytoprocesssmemory!n);exit(-4);printf(Successtomapframebufferdevicememorytoprocesssmemory!n);/drawpixelif(8=fbvar.bits_per_pixel)printf(Starting8bppframebuffertest.n);elseif(16=fbvar.