MTK平臺(tái)camera(攝像頭)學(xué)習(xí)教程解讀

1、-3-ContentsTOC o 1-5 h z HYPERLINK l bookmark2 o Current Document 一、手機(jī)CAMERA的物理結(jié)構(gòu):4- HYPERLINK l bookmark4 o Current Document 二、CAMERA的成像原理：-4-三、CAMERA常見的數(shù)據(jù)輸出格式：5- HYPERLINK l bookmark8 o Current Document 四、閱讀CAMERA的規(guī)格書（以TRULY模組OV5647_RAW為例）：6- HYPERLINK l bookmark12 o Current Document 五、CAMERA的硬件原理

2、圖及引腳7-1、電源部分：-7-2、SENSORINPUT部分：-7-3、SENSOROUTPUT部分：-7-4、I2C部分：SCL,I2C時(shí)鐘信號(hào)線和SDA,I2C數(shù)據(jù)信號(hào)線。-7- HYPERLINK l bookmark20 o Current Document 六、MTK平臺(tái)CAMERA驅(qū)動(dòng)架構(gòu):8-七、MTK平臺(tái)CAMERA相關(guān)代碼文件（以下代碼均為MTK6575平臺(tái)）：9-1CAMERASENSOR驅(qū)動(dòng)相關(guān)文件-9-2、SENSORID和一些枚舉類型的定義-9-3、SENSOR供電-9-4、KERNELSPACE的SENSORLIST,IMGSENSOR模塊注冊-9-5、userS

3、pace的sensorlist，向用戶空間提供支持的sensorlist-10-6、SENSOR效果調(diào)整的接口-10-八、CAMERA模塊驅(qū)動(dòng)、設(shè)備與總線結(jié)構(gòu)：-11-A）驅(qū)動(dòng)的注冊：-11-B）設(shè)備的注冊：-11-C）總線的匹配：-12- HYPERLINK l bookmark40 o Current Document 九、CAMERA驅(qū)動(dòng)工作流程：-13- HYPERLINK l bookmark52 o Current Document 十、CAMERA驅(qū)動(dòng)添加、調(diào)試流程：-17-GhongConfidentialRevision0.1-Feb.1420122012Ghonginc.C

4、ameraDriveranalysisintheplatformofMTKPreliminaryInformation-4-GhongConfidential、手機(jī)Camera的物理結(jié)構(gòu):FPC:FlexiblePrintedCircuit可撓性印刷電路板Holder:基座Lens:鏡頭Sensor:圖象傳感器11IR:紅外濾波片感光區(qū)二、Camera的成像原理:景物通過鏡頭（LENS）生成的光學(xué)圖像投射到圖像傳感器（Sensor）表面上，然后轉(zhuǎn)為模擬的電信號(hào)，經(jīng)過A/D（模數(shù)轉(zhuǎn)換）轉(zhuǎn)換后變?yōu)閿?shù)字圖像信號(hào)，再送到數(shù)字信號(hào)處理芯片CPU處理（DSP）中加工處理，再通過IO接口傳輸?shù)紺PU中處理，

5、通過LCD就可以看到圖像了。Revision0.1-Feb.1420122012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformationGhongConfidentialRevision0.1-Feb.142012-5-2012Ghonginc.圖像傳感器(SENSOR)是一種半導(dǎo)體芯片，其表面包含有幾十萬到幾百萬的光電二極管。光電二極管受到光照射時(shí)，就會(huì)產(chǎn)生電荷。目前的SENSOR類型有兩種：CCD(ChargeCoupleDevice)，電荷耦合器件，它是目前高像素類sensor中比較成熟的成像器件，是以一行

6、為單位的電流信號(hào)。CMOS(ComplementaryMetalOxideSemiconductor)，互補(bǔ)金屬氧化物半導(dǎo)體。CMOS的信號(hào)是以點(diǎn)為單位的電荷信號(hào)，更為敏感，速度也更快，更為省電。ISP的性能是決定影像流暢的關(guān)鍵，JPEGencoder的性能也是關(guān)鍵指標(biāo)之一。而JPEGencoder又分為硬件JPEG壓縮方式，和軟件RGB壓縮方式。DSP控制芯片的作用是：將感光芯片獲取的數(shù)據(jù)及時(shí)快速地傳到baseband中并刷新感光芯片，因此控制芯片的好壞，直接決定畫面品質(zhì)(比如色彩飽和度、清晰度)與流暢度。三、Camera常見的數(shù)據(jù)輸出格式：常見的數(shù)據(jù)輸出格式有：Rawdata格式、YUV格

7、式、RGB格式。RGB格式：采用這種編碼方法，每種顏色都可用三個(gè)變量來表示紅色、綠色以及藍(lán)色的強(qiáng)度。每一個(gè)像素有三原色R紅色、G綠色、B藍(lán)色組成。YUV格式:其中“Y”表示明亮度(Luminance或Luma)，就是灰階值；而“U”和“V”表示色度(Chrominance或Chroma)，是描述影像色彩及飽和度，用于指定像素的顏色。RAWDATA格式:是CCD或CMOS在將光信號(hào)轉(zhuǎn)換為電信號(hào)時(shí)的電平高低的原始記錄，單純地將沒有進(jìn)行任何處理的圖像數(shù)據(jù)，即攝像元件直接得到的電信號(hào)進(jìn)行數(shù)字化處理而得到的。支持YUV/RGB格式的模組，一般會(huì)在模組上集成ISP(ImageSingleProcessor

8、)，經(jīng)過A/D轉(zhuǎn)換過的原始數(shù)據(jù)經(jīng)過ISP處理生成YUV標(biāo)準(zhǔn)格式傳到BB。一般來說，這種設(shè)計(jì)適用于低像素Camera的要求，會(huì)在主板上省去一個(gè)DSP，可降低成本。在調(diào)試過程中，YUV/RGB格式的攝像頭，其所有參數(shù)都可在kernel層通過寄存器來控制。調(diào)試一般由sensor的原廠支持。支持RawData格式的模組，由于感光區(qū)域的需求，不會(huì)再模組內(nèi)集成ISP以最大程度的增大感光區(qū)域的面積，提高照片質(zhì)量。模組把原始的數(shù)字信號(hào)傳給BB上的DSP進(jìn)行處理，MTK自帶的DSP一般包含ISP、JPEGencoder、和DSP控制芯片。在調(diào)試的時(shí)候圖像的效果需要MTK在HAL層的參數(shù)進(jìn)行支持。CameraDr

9、iveranalysisintheplatformofMTKPreliminaryInformationGhongConfidentialRevision0.1-Feb.142012-6-2012Ghonginc.四、閱讀Camera的規(guī)格書（以Truly模組OV5647_Raw為例）：8.50+0.10PINNO.SIGNAL1D52D63D74D8岳D96NC7RESET8NC9DOVDD1.8V10AVI)D_2.8V11AF_VCC_2.8V12PWDN13DGND14STRORE15DI16DGND17XCLK18PCLK19D220D321D422NC23HREF24VSYNC25

10、SIOD26SIOC27AGND28DGND29DO30DNGD主要參數(shù)(ModuleSpecification)焦距(EFL)3,37mm光W(KNO)2.85%搜場角(Vie*Angle)67.42a崎變(Distortion)ATA9|LCfelHEEEl6型煙回1I2C1_SM|6!l2C13CLr65_63029288衛(wèi)10藥ZB-a732FToT5MainCamera宀ii嗣iyCAM_IpPMIJ|.、IiCMDATAOl6叵測ffl兇6疋底晝L6醴坯伍6亟飯匚4.7U.FC411lOOnFC4106!CMPi5Ni|卩二二二!cam_strobej/嘶嚇%6【錘施CR4O54.

11、7KlOOnF4.7uF47KAXK7L30227G/P30/PANASNOICJ12從上面可看出，連接Camera的30根Pin腳可大致分為以下幾類：1、電源部分：a)VCAMD就是DVDD數(shù)字供電，主要給ISP供電，由于RAWDATA格式的sensor其ISP是在BB端，所以將其引腳將其NC。從上面的規(guī)格書上可以看出DVDD是內(nèi)部BB端供電。模組已將其NC掉了；VCAM_IO就是VDDIO數(shù)字IO電源主要給I2C部分供電；VCAMA就是AVDD模擬供電，主要給感光區(qū)和ADC部分供電；VCAM_AF是對(duì)Camera自動(dòng)對(duì)焦馬達(dá)的供電。2、SensorInput部分：Reset信號(hào)，用于復(fù)位、

12、初始化。Standby/PowerDown信號(hào)，用于進(jìn)入待機(jī)模式，降低功耗。Mclk，即MasterClock信號(hào)，是由BB端提供。3、SensorOutPut部分：Pclk，即PixelClock信號(hào)，由MCLK分頻得到，作為外部時(shí)鐘控制圖像傳輸幀率HSYNC，行同步信號(hào)，其上升沿表示新一列行圖像數(shù)據(jù)的開始。VSYNC，幀同步信號(hào)，其下降沿表示新的一幀圖片的開始。D0-D9一共10根數(shù)據(jù)線(8/10根等)；4、I2C部分：SCL，I2C時(shí)鐘信號(hào)線和SDA，I2C數(shù)據(jù)信號(hào)線。I2CParallelSensorcaiiiSntcamhsvncMini日總taI古n甘CMMCLKCM_PDNMip

13、lelklaneBaseBandcam_pclkcam_dat9:0J_乍MIPISensorGhongConfidentialRevision0.1-Feb.1420122012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformation六、MTK平臺(tái)Camera驅(qū)動(dòng)架構(gòu)：IFMbum空;LAPPL1CAT】CIZ冃LinuxKernelHomeDialerSMS/MMSBrov/serCameraAlarmCakulatorVoiceDialEmailClockPackageManagerTelephonyMan

14、agerDisplayDriverUSBOnYerAudioDriversContactsCalendarResourceManagerLocationManagerARDWAREABSTRACTI口ZLAYERGPSRadio(RlLjWiFiCameraCriverBluetoothDriverGlaredMemoryDriverEinder(IPC)DriverK每padDhyerWiFiDriYerPowerManagementMediaPlayerApplicationFrameYiewSystemC：penGL|=SPhotoRKActivityManagerWindowManag

15、erContentProvidersNotificationManagerSurfakManageAudioManagerMediaFrameworkLt曰RARIESSQLiteV/ebKitLibcAnD民口ldIRuNT1MECoreLibrariesCarrenBluetooth上圖的架構(gòu)相信大家都有了一定的了解android將系統(tǒng)大致分為應(yīng)用層、庫文件和硬件抽象層、Linux內(nèi)核三層。在底層的內(nèi)核空間，Camera的driver將其驅(qū)動(dòng)起來以后，將硬件驅(qū)動(dòng)的接口交給硬件抽象層(hal:HardwareAbstractionLayer)，android上層的Camera應(yīng)用程序在and

16、roid實(shí)時(shí)系統(tǒng)中的虛擬機(jī)中，加載android留給Camera公用的一些庫文件，調(diào)用硬件抽象層(hal)的接口來控制Camera硬件來實(shí)現(xiàn)功能。當(dāng)然，如果是Raw模式的Camera，還需要在硬件抽象層(hal)調(diào)用一些參數(shù)來控制Camera的效果。GhongConfidentialRevision0.1-Feb.1420122012Ghonginc.七、MTK平臺(tái)Camera相關(guān)代碼文件（以下代碼均為MTK6575平臺(tái)）：1、CameraSensor驅(qū)動(dòng)相關(guān)文件kernel-3.10/drivers/misc/mediatek/imgsensor/src/platform/alpsmedia

17、tek匸ustomcommonkemetimgsensorov5647_raw驅(qū)動(dòng)代碼ov5647_CameraCustomized.hov5647_CameraSensorpara.hov5647_Sensor.cov5647_Sensorf2、SensorID和一些枚舉類型的定義vendor/mediatek/proprietary/custom/common/kernel/imgsensor/inc/kd_imgsensor.h3、Sensor供電kernel-3.10/drivers/misc/mediatek/mach/platform/project/camera/camera/k

18、d_camera_hw.c4、KernelSpace的SensorList，imgsensor模塊注冊kernel-3.10/drivers/misc/mediatek/imgsensor/src/platform/kd_sensorlist.h- -GhongConfidentialRevision0.1-Feb.1420122012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformationGhongConfidentialRevision0.1-Feb.142012- -2012Ghonginc.5、UserS

19、pace的SensorList，向用戶空間提供支持的SensorListvendor/mediatek/proprietary/custom/platform/hal/D1(D2)/imgsensor_src/sensorlist.cpp6575W19-aialpsmediatekcustomcommonhalimgsensorsrcF-sensoilistxpp提供給陰戶空間的SensorList6、Sensor效果調(diào)整的接口CameraDriveranalysisintheplatformofMTKPreliminaryInformation- -八、Camera模塊驅(qū)動(dòng)、設(shè)備與總線結(jié)構(gòu)：

20、一般在Linux設(shè)備驅(qū)動(dòng)模型中，我們只需要關(guān)心總線、設(shè)備、驅(qū)動(dòng)這三個(gè)實(shí)體。總線會(huì)充當(dāng)紅娘對(duì)加載于其上的設(shè)備與驅(qū)動(dòng)進(jìn)行配對(duì)，對(duì)于Camera模塊也不例外，下面從總線、設(shè)備、驅(qū)動(dòng)的角度來分析Camera模塊驅(qū)動(dòng)的注冊、匹配與加載過程。驅(qū)動(dòng)的注冊：在(customcommonkernelimgsensorsrcKd_sensorlist.c)CAMERA_HW_i2C_init這個(gè)函數(shù)里通過Platform_driver_register(&g_stCAMERA_HW_Driver)把Camera模塊驅(qū)動(dòng)注冊至UPlatform總線上。而g_stCAMERA_HW_Driver是對(duì)結(jié)構(gòu)體Platfo

21、rm_driver這個(gè)結(jié)構(gòu)體的填充。staticstructplatform_drivergstCAMERAHWDriver=.probe=CAMERA-HW-probe,廠已move=CAMERAHWremovej.suspend=CAMERAHWsuspend,.resum已=CAMERAIHWresume,.driver=-.name=iiridig已_5：仃5口.owner=THISMODULE,;(KernelincludelinuxPlatform_device.h)structplatfDrm_driverintXpe*obe)(structplatfonn_d&wice駕.in

22、t(removeXstructpIatform_device:void*shutdown)(structplatforin_devLce爭)；int(*suspend)(structplatforin_device*)pm_inesage_tstate)；int(*resume)(structplatform-device*)structdevice_driyerdriver;：honststructpIatforin_dtvjce_id*id_table;Platform_driver這個(gè)結(jié)構(gòu)體包含Probe()、Remove()等函數(shù)來完成驅(qū)動(dòng)的填充。設(shè)備的注冊：對(duì)platform_dev

23、ice的定義通常在BSP的板級(jí)文件:(kernelarchshboardsmach-ap325rxaSetup.c)中實(shí)現(xiàn)，在板級(jí)文件中，將platform_device歸納為一個(gè)數(shù)組，最終通過platform_add_device()函數(shù)統(tǒng)一注冊：:staticstructplatform_devicecamera_device=.name=so.ccainera_pIatform,.dev=.platform_data=camera_info,.release=dummy_relea5ej：GhongConfidentialRevision0.1-Feb.1420122012Ghongin

24、c.CameraDriveranalysisintheplatformofMTKPreliminaryInformationGhongConfidentialRevision0.1-Feb.142012- -2012Ghonginc.staticintap325rXa_Camera_add(structsoc_camera_link*1|,structdevice*dey)if(icl!=c&mer_/inkcamera_probe()=o)return-ENODiv；C3mer3_info.dev=dev;returnplatform_device_register(.camera_devi

25、ce);沁“叮1.bus_id=0.add_device=ap325rxa_camera_addJ.del_device=ap325rxa_camera_del,module_n日rme=soc_cairiera_platfonTiJ.privfcmer&_info；總線的匹配：既然是驅(qū)動(dòng)Platform_device那對(duì)應(yīng)的設(shè)備必然是掛載Platform總線上的Platform_device，Platform總線是Linux系統(tǒng)提供的一種機(jī)制，不同于I2C、I2S等總線它是一種虛擬的總線。Linux系統(tǒng)為Platform總線定義了一個(gè)bus_type的實(shí)例Platform_bus_type：

26、Kerneldriversbaseplatform.c)structbusjypeplattorm_bus_type=m_opsfPlatform總線通過platform_match這個(gè)成員函數(shù)來確定platform_device與platform_driver如何進(jìn)行匹配：十亠”staticintpIatrorm_mateh(structdevice*deVjstructdaice_drierdrv)Istructplatfonn_cleviGe.*pdev=to_pIatfonn_device(dev)jstructplatform_clnv-erpdrv=to_pIatfrm_drive

27、r(drv/.*matchagainsttheidtablefirst柑訐(pdrv-;d_tablejreturnplatform_match_id(pdrv-1d_tablejpdev)!=NULL;/fall-backtodrivernamematch*/returni(.5trcinp(pdev-riame；drv-naine)=九、Camera驅(qū)動(dòng)工作流程：從上圖可以清晰的了解到Camera的一個(gè)工作流程主要分為這么七步：打開CameraPowerLDO,讓Camera有能量保證。打開IIC,設(shè)置PDN引腳，使Camera退出出Standby模式，按照要求讓Reset腳做一個(gè)復(fù)位動(dòng)作

28、。讀一下sensor的版本ID,這樣可以讓你確認(rèn)是否連接上你想要的sensor。對(duì)Sensor進(jìn)行初始化下載最基本的參數(shù)讓Sensor工作起來，可能包括軟復(fù)位。下載preview的參數(shù)，為預(yù)覽動(dòng)作準(zhǔn)備。下載Capture的參數(shù)，為拍照動(dòng)作準(zhǔn)備。設(shè)置PDN引腳，使Sensor進(jìn)入Standby模式，或者關(guān)掉LDO等動(dòng)作，退出Camera。我們都知道，Linux內(nèi)核是通過模塊的機(jī)制來加載設(shè)備驅(qū)動(dòng)的，那么接下來我們就從設(shè)備模塊加載的角度來看下Camera工作流程的驅(qū)動(dòng)代碼是如何工作的。在-alpsmediatekcustomcommonkernelimgsensorsrckd_sensorlist.

29、c中可以看到：module_init(CAMERA_HW_i2C_init);module_exit(CAMERA_HW_i2C_exit);在這里L(fēng)inux內(nèi)核加載和卸載Camera模塊。CameraDriveranalysisintheplatformofMTKPreliminaryInformationstaticstructplatform_driverg_stCAMERA_HW_Driver=.probe=CAMERA_HW_probe,.remove=CAMERA_HW_remove,.suspend=CAMERA_HW_suspend,.resume=CAMERA_HW_resu

30、me,.driver=I!f!.name=image_sensor,.owner=THIS_MODULE,;Camera模塊初始化開始向總線注冊驅(qū)動(dòng)，在Platform_driver的成員函數(shù).probe()中，通過i2c_add_driver(&CAMERA_HW_i2c_driver)向I2C申請(qǐng)，而CAMERA_HW_i2c_driver這個(gè)結(jié)構(gòu)體里填充的是將Camera作為一個(gè)字符設(shè)備在I2C上進(jìn)行注冊:structi2c_driverCAMERA_HW_i2c_driver=.probe=CAMERA_HW_i2c_probej.remove=CAMERA_HW_i2c_remove

31、,.detect=CAMERA_HW.=CAMERA_HW_DR/NAME,.id_table=CAMERA-HWjZcJd,.addres5_data=addr_dat:a)h；staticintCAMERA_HW_i2c_probe(structi2c_client*clientjconststructi2c_device*id)inti4RetValue=0;PK_DBG(CAMERA_HWAttachI2Cn);/getsensori2cclientg_pstI2Cclient=client;/setI2Cclockrateg_pstI2Cclient-timin

32、g=200;/200k/Registerchardriveri4RetValue=RegisterCAMERA_HWCharDrv();if(i4RetValue)PK_ERR(CAMERA_HWregisterchardevicefailed!n);returni4RetValue;/spin_lock_init(&g_CamHWLock);PK_DBG(CAMERA_HWAttached!n);return0；?endCAMERA_HW_i2c_prc.be?在RegisterCAMERA_HWCharDrv()中cdev_init(g_pCAMERA_HW_CharDrv,&g_stCA

33、MERA_HW_fops)對(duì)設(shè)備進(jìn)行初始化，并將g_stCAMERA_HW_fops這個(gè)文件操作函數(shù)作為上層對(duì)Camera設(shè)備操作的接口留給上層進(jìn)行調(diào)用:GhongConfidentialRevision0.1-Feb.142012-14-2012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformation- -staticconststructfile_operationsg_stCAMERA_HW_fops=.owner=THIS-MCiDULE,.open=CAMERA_HW_Open.release=CAME

34、RA_HW_ReleaseJ#ifdefUSE_NEW_IOCTL.unlocl_GETRESOLUTION:i4RetValue=adopt_CAMERA_HW_GetResolution(pBuff)$break;caseKDIMGSENSQRIO.C_X_FEATUREC0NCTROL:i4RetValue=adopt_CAMERA_HW_FeatureCantrol(pBuff);break;caseKDIMjGSENSORIOC_JS_t.ONTROL:i4RetValue=adopt_CAMERA_HW_Control(pBuff);break;caseKDIMGSENSORIOC

35、_T_CLCiSE:i4RetValue=adopt_CAMERA_HW_Clo5e();break;caseKDIMSENSORIOC_T_CHE匚k_I吿_ALIVE：i4RetValue=adopt_CAMERA_HW_CheckIsAlive();break;default:PK_DBG(No-suchcommandi4RetValue=-EPERM;break;通過判斷Sensor狀態(tài)的邏輯值來進(jìn)行具體的操作，對(duì)于這個(gè)值的定義在:MediatekcustomcommonkernelimgsensorincKd_imgsensor.h中GhongConfidentialRevision

36、0.1-Feb.1420122012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformation7/ThisconmnandwillTBD#defin&KDIMGSENSORIDC_T_OPEN-IQflMSENSORMAGIC.o)/sensorGetlnfoZ/This：coimnandwillTBD#defineKDIMGSENSORXS：C_X_GETINFO-IQWRflMGSENSORMAGICjACDK/Jsenso;rGetResolutionp/Thi?coimnand顧illTBD#defineK

37、DIMGSENSORIOC_X_GETRESOLUTIWN.IOWRtlMGSENORMAGlC.lOE/menscirFe日tueGcintrcd/ThiscoimnandwillTBDdefineKDIMGSENSORIIC_K_FEATURECONCTROL.IOWRtlMGSENS&RMAGIC,!/sensorControl7/This-cjoimnand円illTBD#defineKDIMGSENSORWC_X_C匚NTFtULaWRflMGSENSORMAGIC.EO.ACD./sensorClose/Thisctjimnand楝槪TBD/$etsensordriver#defi

38、ne/sensorSeaKjchdefineKDIMGSENSORIOC_T_CLOSE-IO.tlMGSENSORMAGIC.ZS).IOWRtlMGSENSORMAGICO.uSKDIMGSENSOR1GCXSETDRIVEdefineKDIMGSENSORIOC_T_CHECK_IS_ALIVE_IOIMGSENSORMAGICj30)在KdSetDriver()中通過判斷name和ID匹配具體型號(hào)的sensor的驅(qū)動(dòng)，判斷它是主攝還是次攝，并對(duì)它進(jìn)行初始化：if(drvldxMAX_NUM_OF_SUPPORT_SENSOR):=”PowerOFF：M匸；T1SubCameraE1S*

39、：PowerOn：lrIf7i廠廠i設(shè)置CMPDNI止從攝進(jìn)入卩DN設(shè)flCMRSTI止從攝R琢t無效:WOV5647規(guī)格書.5上電順序供電:1:7-_:;.j-:MI9VI14規(guī)格書;：上電盹序供電：-：jj5jjcj:juLIij:ifir：!：!-丄丄.:r弗:ii3Set1-pinSetIdxIDX_PSCMPDNrpinSet1-pinSetIdXJIDX_PS_CMP廿(mt2sef卵io皿9訃渝313肓口1:1曲和口_用曰迎I,GPIO_DIROUT)if(iiit、Etgpioout(pinSEXmnSEHdxID)Cp3j；pinsEtpirSEtIdx述壬兩聲電拠匹為眄歩)

40、|紆是從研始比他笫七住是u32pinSetldx=0；/defaultmainsensor#defineIDXPSMODE1#defineIDXPSONZdefineIDXPSjOFF0u32pinSet38XjStfor沁GlGPIOGPIOOUT空gpiocamera3GPIO_OUONEr_GPIOOUTZEROpGPIOCAMERACMPDNl_PINr報(bào)據(jù)它前面的iF條件GPIOCAMERACMPDN1_PIN_M_GPIOr判航這SpinSetld=ltGPIO_OUT_ONEr所以1-pinSeto就睪對(duì)GPIO_OUT_ZERO,MalnSensorPON憶,曲遵嚴(yán)、/form

41、air_2sensorJ:FGPIOCAMERA2CMRSTPIN,if(DUAL_CAMERAJUJN_SENSOR二二Sensorldx)pinSetldx:elseif(DUALCSpinSetldx:elseif(DUALCAIIEftAMAIN5EC0h!D5ENS0R=SemoHcIx)Pietldx=2;用作后攝兼容或雙后攝供電創(chuàng)建SensorFuncOV5647這樣一個(gè)數(shù)據(jù)結(jié)構(gòu)SENSOR_FUNCTION_STRUCTSensorFuncOV5647=OV5647Open,OV5647GetInfo,OV5647GetResolution,OV5647FeatureContr

42、ol,OV5647Control,OV5647Close;GhongConfidentialRevision0.1-Feb.1420122012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformation- -UINT320V56470pen(void)讀取IDkal_uintl6sensor_id=0；sensor_id=(0V5647reademossense0X3B0ASENSORif(sensorreturnERRORSENSOftCONNECTFAIL;如果ID匹蟲：前調(diào)用初始化函礎(chǔ)二0V5647Senso

43、rInitf)；returnERRORNONE;/*0V56470penA/根據(jù)ClV5647DaT3Sheet010V5647reademossenV：7-JlTtTTqTT3-TZdefineOV5630SENSOID#define0V7675_SENS0R_ID#define0V5647SENSORID0X300B0X56340X7673OV5647Open初始化操作就是對(duì)SensorIC中寄存器的操作，調(diào)試主要由IC原廠支持。Open函數(shù)結(jié)束后返回ERROR_NONE表示初始化成功，可以正常使用。OV5647GetInfoUINT32OV5647GetInfo(MSDK_SCENARI

44、O_ID_ENUMScenarioId,MSDK_SENSOR_INFO_STRUCT*pSensorInfo,MSDK_SENSOR_CONFIG_STRUCT*pSensorConfigData)第一個(gè)參數(shù)ScenarioId來自于MSDK_SCENARIO_ID_ENUM這個(gè)數(shù)組，在kd_imgsensor_define.h中是這樣定義的：#defineMSDK_SCENARIO_ID_ENUMACDK_SCENARIO_ID_ENUMtypedefenumACDK_SCENARIO_ID_CAMERA_PREVIEW=0,ACDK_SCENARIO_ID_VIDEO_PREVIEW,A

45、CDK_SCENARIO_ID_VIDEO_CAPTURE_MPEG4,ACDK_SCENARIO_ID_CAMERA_CAPTURE_JPEG,ACDK_SCENARIO_ID_CAMERA_CAPTURE_MEM,ACDK_SCENARIO_ID_CAMERA_BURST_CAPTURE_JPEG,ACDK_SCENARIO_ID_VIDEO_DECODE_MPEG4,ACDK_SCENARIO_ID_VIDEO_DECODE_H263,ACDK_SCENARIO_ID_VIDEO_DECODE_H264,ACDK_SCENARIO_ID_VIDEO_DECODE_WMV78,ACDK_S

46、CENARIO_ID_VIDEO_DECODE_WMV9,ACDK_SCENARIO_ID_VIDEO_DECODE_MPEG2,ACDK_SCENARIO_ID_IMAGE_YUV2RGB,ACDK_SCENARIO_ID_IMAGE_RESIZE,ACDK_SCENARIO_ID_IMAGE_ROTATE,GhongConfidentialRevision0.1-Feb.1420122012Ghonginc.PreliminaryInformationCameraDriveranalysisintheplatformofMTKPreliminaryInformationACDK_SCENA

47、RIO_ID_IMAGE_POST_PROCESS,ACDK_SCENARIO_ID_JPEG_RESIZE,ACDK_SCENARIO_ID_JPEG_DECODE,ACDK_SCENARIO_ID_JPEG_PARSE,ACDK_SCENARIO_ID_JPEG_ENCODE,ACDK_SCENARIO_ID_JPEG_ENCODE_THUMBNAIL,ACDK_SCENARIO_ID_DRIVER_IO_CONTROL,ACDK_SCENARIO_ID_DO_NOT_CARE,ACDK_SCENARIO_ID_IMAGE_DSPL_BUFFER_ALLOC,ACDK_SCENARIO_I

48、D_TV_OUT,ACDK_SCENARIO_ID_MAX,ACDK_SCENARIO_ID_VIDOE_ENCODE_WITHOUT_PREVIEW,ACDK_SCENARIO_ID_CAMERA_CAPTURE_JPEG_BACK_PREVIEW,ACDK_SCENARIO_ID_VIDEO_DECODE_RV8,ACDK_SCENARIO_ID_VIDEO_DECODE_RV9,ACDK_SCENARIO_ID_CAMERA_ZSD,ACDK_SCENARIO_ID_ENUM;通過這個(gè)數(shù)組定義Camera的各種模式，并且給他們從0開始給一個(gè)模擬的ID,通過這個(gè)ScenarioID來控制C

49、amera的工作模式是在拍照、攝像等等。想要了解*pSensorInfo這個(gè)指針的內(nèi)容就得看MSDK_SENSOR_INFO_STRUCT的定義#defineMSDK_SENSOR_INFO_STRUCTACDK_SENSOR_INFO_STRUCTtypedefstructMUINT16SensorPreviewResolutionX;MUINT16SensorPreviewResolutionY;MUINT16SensorFullResolutionX;MUINT16SensorFullResolutionY;MUINT8SensorClockFreq;/*MHz*/MUINT8Senso

50、rCameraPreviewFrameRate;MUINT8SensorVideoFrameRate;MUINT8SensorStillCaptureFrameRate;MUINT8SensorWebCamCaptureFrameRate;MUINT8SensorClockPolarity;/*SENSOR_CLOCK_POLARITY_HIGH/SENSOR_CLOCK_POLARITY_Low*/GhongConfidentialRevision0.1-Feb.142012-21-2012Ghonginc.CameraDriveranalysisintheplatformofMTKMUIN

51、T8SensorClockFallingPolarity;MUINT8SensorClockRisingCount;/*0.15*/MUINT8SensorClockFallingCount;/*0.15*/MUINT8SensorClockDividCount;/*0.15*/MUINT8SensorPixelClockCount;/*0.15*/MUINT8SensorDataLatchCount;/*0.15*/MUINT8SensorHsyncPolarity;MUINT8SensorVsyncPolarity;MUINT8SensorInterruptDelayLines;MINT3

52、2SensorResetActiveHigh;MUINT32SensorResetDelayCount;ACDK_SENSOR_INTERFACE_TYPE_ENUMSensroInterfaceType;ACDK_SENSOR_OUTPUT_DATA_FORMAT_ENUMSensorOutputDataFormat;ACDK_SENSOR_MIPI_LANE_NUMBER_ENUMSensorMIPILaneNumber;CAMERA_ISO_BINNING_INFO_STRUCTSensorISOBinningInfo;MUINT32CaptureDelayFrame;MUINT32Pr

53、eviewDelayFrame;MUINT32VideoDelayFrame;MUINT16SensorGrabStartX;MUINT16SensorGrabStartY;MUINT16SensorDrivingCurrent;MUINT8SensorMasterClockSwitch;MUINT8AEShutDelayFrame;/*Theframeofsettingshutterdefault0forTGint*/MUINT8AESensorGainDelayFrame;/*Theframeofsettingsensorgain*/MUINT8AEISPGainDelayFrame;MU

54、INT8MIPIDataLowPwr2HighSpeedTermDelayCount;MUINT8MIPIDataLowPwr2HighSpeedSettleDelayCount;MUINT8MIPICLKLowPwr2HighSpeedTermDelayCount;MUINT8SensorWidthSampling;MUINT8SensorHightSampling;MUINT8SensorPacketECCOrder;MUINT8SensorDriver3D;ACDK_SENSOR_INFO_STRUCT,*PACDK_SENSOR_INFO_STRUCT;GhongConfidentia

55、lRevision0.1-Feb.142012-22-2012Ghonginc.CameraDriveranalysisintheplatformofMTK這個(gè)結(jié)構(gòu)體列取了Sensor的時(shí)鐘頻率、預(yù)覽時(shí)的幀率、行同步/幀同步頻率等參數(shù)。第三個(gè)參數(shù)*pSensorConfigData同樣根據(jù)MSDK_SENSOR_CONFIG_STRUCT結(jié)構(gòu)體#defineMSDK_SENSOR_CONFIG_STRUCTACDK_SENSOR_CONFIG_STRUCTtypedefstructACDK_SENSOR_IMAGE_MIRROR_ENUMSensorImageMirror;MINT32Enab

56、leShutterTansfer;/*Capture時(shí)的快門設(shè)置*/MINT32EnableFlashlightTansfer;/*有閃光燈的SensorCapture時(shí)的快門設(shè)置*/ACDK_SENSOR_OPERATION_MODE_ENUMSensorOperationMode;/*Capture的圖像寬度*/*Capture的圖像高度*/MUINT16MUINT16MUINT16MUINT16MUINT16MUINT16MUINT16ImageTargetWidth;ImageTargetHeight;CaptureShutter;FlashlightDuty;FlashlightOf

57、fset;FlashlightShutFactor;FlashlightMinShutter;/*Capture時(shí)的快門設(shè)置*/*有閃光燈的SensorCapture時(shí)的快門設(shè)置*/*有閃光燈的SensorCapture時(shí)的快門設(shè)置*/*有閃光燈的SensorCapture時(shí)的快門設(shè)置*/*有閃光燈的SensorCapture時(shí)的快門設(shè)置*/MUINT32Pixels;MUINT32Lines;MUINT32Shutter;MUINT32FrameLines;ACDK_CAMERA_OPERATION_MODE_ENUMMetaMode;MUINT32DefaultPclk;/Sensor默認(rèn)

58、的像素時(shí)鐘頻率(Ex:24000000)ACDK_SENSOR_CONFIG_STRUCT;OV5647GetResolutionUINT32OV5647GetResolution(MSDK_SENSOR_RESOLUTION_INFO_STRUCT*pSensorResolution)此函數(shù)只有一個(gè)參數(shù)*pSensorResolution,找到結(jié)構(gòu)體：MSDK_SENSOR_RESOLUTION_INFO_STRUCT#defineMSDK_SENSOR_RESOLUTION_INFO_STRUCTACDK_SENSOR_RESOLUTION_INFO_STRUCTtypedefstruct

59、MUINT16SensorPreviewWidth;/預(yù)覽時(shí)的圖像寬度MUINT16SensorPreviewHeight;/預(yù)覽時(shí)的圖像高度GhongConfidentialRevision0.1-Feb.142012-23-2012Ghonginc.CameraDriveranalysisintheplatformofMTKPreliminaryInformationMUINT16SensorFullWidth;MUINT16SensorFullHeight;ACDK_SENSOR_RESOLUTION_INFO_STRUCT,*PACDK_SENSOR_RESOLUTION_INFO_STRUCT;到這里可以發(fā)現(xiàn)同樣是獲取Sensor的信息，GetInfo函數(shù)獲取并設(shè)置了Sensor所處的模式、設(shè)置