MTK平台camera（摄像头）调试教程 - 图文(4)

Camera Driver analysis in the platform of MTK

2、 检查、配置供电文件：

Preliminary Information

-alps\\mediatek\\custom\\$project$\\Kernel\\Camera\\Camera\\kd_camera_hw.c

Camera 供电流程（以 3M 前摄 MT9V114+5M 后摄 OV5647 为例）：

其实在 kd_camera_hw.c 中只有一个函数 kdCISModulePowerOn（），在这个 函数中需要注意的是通过 GPIO 口控制 PDN 和 RST 引脚的时候，对于其相关的

定义，由其在切换平台的时候。例如 MT6573 和 MT6575 的定义顺序就不同。

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Camera Driver analysis in the platform of MTK

Preliminary Information

3、 添加 Camera 驱动（以 ov5647 为例）：

创建 SensorFuncOV5647 这样一个数据结构 SENSOR_FUNCTION_STRUCT SensorFuncOV5647= { OV5647Open,

OV5647GetInfo, OV5647GetResolution, OV5647FeatureControl,

OV5647Control, OV5647Close};

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Ghong Confidential

Revision 0.1-Feb.14 2012

?2012 Ghong inc.

Camera Driver analysis in the platform of MTK

a) OV5647Open

Preliminary Information

初始化操作就是对 SensorIC 中寄存器的操作，调试主要由 IC 原厂支持。Open 函数结

束后返回 ERROR_NONE 表示初始化成功，可以正常使用。

b) OV5647GetInfo

UINT32 OV5647GetInfo(MSDK_SCENARIO_ID_ENUM ScenarioId, MSDK_SENSOR_INFO_STRUCT *pSensorInfo,

MSDK_SENSOR_CONFIG_STRUCT *pSensorConfigData)

第一个参数 ScenarioId 来自于 MSDK_SCENARIO_ID_ENUM 这个数组，在

kd_imgsensor_define.h 中是这样定义的： #define MSDK_SCENARIO_ID_ENUM typedef enum {

ACDK_SCENARIO_ID_CAMERA_PREVIEW=0, ACDK_SCENARIO_ID_VIDEO_PREVIEW, ACDK_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_SCENARIO_ID_VIDEO_DECODE_WMV9, ACDK_SCENARIO_ID_VIDEO_DECODE_MPEG2, ACDK_SCENARIO_ID_IMAGE_YUV2RGB,

ACDK_SCENARIO_ID_ENUM

ACDK_SCENARIO_ID_IMAGE_RESIZE,

ACDK_SCENARIO_ID_IMAGE_ROTATE, Ghong Confidential Revision 0.1-Feb.14 2012

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Camera Driver analysis in the platform of MTK

ACDK_SCENARIO_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_ID_TV_OUT,

Preliminary Information

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_ENUM;

ACDK_SCENARIO_ID_CAMERA_ZSD,

通过这个数组定义 Camera 的各种模式，并且给他们从 0 开始给一个模拟的 ID，通过这个

ScenarioID 来控制 Camera 的工作模式是在拍照、摄像等等。

想要了解*pSensorInfo 这个指针的内容就得看 MSDK_SENSOR_INFO_STRUCT 的定义

#define MSDK_SENSOR_INFO_STRUCT ACDK_SENSOR_INFO_STRUCT typedef struct {

MUINT16 SensorPreviewResolutionX; MUINT16 SensorPreviewResolutionY; MUINT16 SensorFullResolutionX; MUINT16 SensorFullResolutionY; MUINT8 SensorClockFreq;

/* MHz */

MUINT8 SensorCameraPreviewFrameRate; MUINT8 SensorVideoFrameRate; MUINT8 SensorStillCaptureFrameRate;

MUINT8 SensorWebCamCaptureFrameRate; MUINT8

SensorClockPolarity;

/*

SENSOR_CLOCK_POLARITY_HIGH/SENSOR_CLOCK_POLARITY_Low */

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Camera Driver analysis in the platform of MTK

MUINT8 SensorClockFallingPolarity; MUINT8 SensorClockRisingCount; MUINT8 SensorClockFallingCount; MUINT8 SensorClockDividCount; MUINT8 SensorPixelClockCount; MUINT8 SensorDataLatchCount; MUINT8 SensorHsyncPolarity; MUINT8 SensorVsyncPolarity; MUINT8 SensorInterruptDelayLines; MINT32 SensorResetActiveHigh; MUINT32 SensorResetDelayCount;

ACDK_SENSOR_INTERFACE_TYPE_ENUM SensroInterfaceType;

/* 0..15 */

Preliminary Information

/* 0..15 */

/* 0..15 */

/* 0..15 */

/* 0..15 */

ACDK_SENSOR_OUTPUT_DATA_FORMAT_ENUM SensorOutputDataFormat; ACDK_SENSOR_MIPI_LANE_NUMBER_ENUM SensorMIPILaneNumber; CAMERA_ISO_BINNING_INFO_STRUCT SensorISOBinningInfo; MUINT32 CaptureDelayFrame; MUINT32 PreviewDelayFrame; MUINT32 VideoDelayFrame; MUINT16 SensorGrabStartX; MUINT16 SensorGrabStartY; MUINT16 SensorDrivingCurrent; MUINT8 MUINT8

/* The frame of setting shutter default 0 for TG

SensorMasterClockSwitch; AEShutDelayFrame;

int */ MUINT8 MUINT8 MUINT8 MUINT8 MUINT8 MUINT8 MUINT8 MUINT8

AESensorGainDelayFrame; AEISPGainDelayFrame;

/* The frame of setting sensor gain */

MIPIDataLowPwr2HighSpeedTermDelayCount; MIPIDataLowPwr2HighSpeedSettleDelayCount; MIPICLKLowPwr2HighSpeedTermDelayCount; SensorWidthSampling; SensorHightSampling; SensorPacketECCOrder;

MUINT8 SensorDriver3D;

} ACDK_SENSOR_INFO_STRUCT, *PACDK_SENSOR_INFO_STRUCT;

Ghong Confidential Revision 0.1-Feb.14 2012

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