經(jīng)典好文推薦，通過閱讀本文，您將收獲以下知識點(diǎn):

一、Camx UMD Log Debug
二、Camx KMD log Debug
三、常用縮寫解釋
四、參考文獻(xiàn)

一、Camx UMD Log Debug

1.1 兩種方式設(shè)置camx UMD Log

1. /vendor/etc/camera/camxoverridesettings.txt
   設(shè)置完需要重啟后才可以生效

2. adb shell setprop
   設(shè)置完后生效，重啟后失效

1.2 Camx UMD log 等級

Camx log 等級包含如下內(nèi)容：

1.3 Camx UMD log Group

Camx UMD log Group 控制主要采用32位二進(jìn)制數(shù)值進(jìn)行控制開關(guān)。
比如關(guān)閉全為0
0000 0000 0000 0000 0000 0000 0000 0000

Camx UMD Log Group 舉例如下：

typedef UINT32 CamxLogGroup;
static const CamxLogGroup CamxLogGroupNone          = (1 << 0);     /0x1        //< Generic group   
static const CamxLogGroup CamxLogGroupSensor        = (1 << 1);     /0x2        //< Sensor
static const CamxLogGroup CamxLogGroupIFace         = (1 << 2);     /0x4        //< IFace
static const CamxLogGroup CamxLogGroupISP           = (1 << 3);     /0x8        //< ISP
static const CamxLogGroup CamxLogGroupPProc         = (1 << 4);     /0x10       //< Post Processor
static const CamxLogGroup CamxLogGroupImgLib        = (1 << 5);     /0x20       //< Image Lib
static const CamxLogGroup CamxLogGroupCPP           = (1 << 6);     /0x40       //< CPP
static const CamxLogGroup CamxLogGroupHAL           = (1 << 7);     /0x80       //< HAL
static const CamxLogGroup CamxLogGroupJPEG          = (1 << 8);     /0x100      //< JPEG
static const CamxLogGroup CamxLogGroupStats         = (1 << 9);     /0x200      //< Stats
static const CamxLogGroup CamxLogGroupCSL           = (1 << 10);    /0x400      //< CSL
static const CamxLogGroup CamxLogGroupApp           = (1 << 11);    /0x800      //< Application
static const CamxLogGroup CamxLogGroupUtils         = (1 << 12);    /0x1000     //< Utilities
static const CamxLogGroup CamxLogGroupSync          = (1 << 13);    /0x2000     //< Sync
static const CamxLogGroup CamxLogGroupMemSpy        = (1 << 14);    /0x4000     //< MemSpy
static const CamxLogGroup CamxLogGroupAssert        = (1 << 15);    /0x8000     //< Asserts
static const CamxLogGroup CamxLogGroupCore          = (1 << 16);    /0x10000    //< Core
static const CamxLogGroup CamxLogGroupHWL           = (1 << 17);    /0x20000    //< HWL
static const CamxLogGroup CamxLogGroupChi           = (1 << 18);    /0x40000    //< CHI
static const CamxLogGroup CamxLogGroupDRQ           = (1 << 19);    /0x80000    //< DRQ
static const CamxLogGroup CamxLogGroupFD            = (1 << 20);    /0x100000   //< FD
static const CamxLogGroup CamxLogGroupIQMod         = (1 << 21);    /0x200000   //< IQ module
static const CamxLogGroup CamxLogGroupLRME          = (1 << 22);    /0x400000   //< LRME
static const CamxLogGroup CamxLogGroupNCS           = (1 << 23);    /0x800000   //< NCS
static const CamxLogGroup CamxLogGroupMeta          = (1 << 24);    /0x1000000  //< Metadata
static const CamxLogGroup CamxLogGroupAEC           = (1 << 25);    /0x2000000  //< AEC
static const CamxLogGroup CamxLogGroupAWB           = (1 << 26);    /0x4000000  //< AWB
static const CamxLogGroup CamxLogGroupAF            = (1 << 27);    /0x8000000  //< AF

如果打開不同group 的log，那么修改對應(yīng)的值即可。
比如：
單獨(dú)打開 CSL HAL Sensor CHI 三組Info Log Mask

               CHI       CSL  HAL  Sensor  
 0    0    0    4    0    4    8    2  =0x40482
0000 0000 0000 0100 0000 0100 1000 0010

logWarningMask=0x00040482
logWarningMask=0x40482
此時log mask 可以使用上面兩種，注意，前面的0可以省略，后面的0不可以省略。

比如：
打開所有的 Verbose Log Mask
0xFFFFFFFF 打開所有的log
logVerboseMask=0xFFFFFFFF

1.4 Camx log 打印的標(biāo)準(zhǔn)格式：

CamX: [][] :

eg：

04-25 1629.192  1014  1314 I CamX    : [CONFIG][HAL    ] camxhal3.cpp:552 open() HalOp: Begin OPEN, logicalCameraId: 0, cameraId: 0

二、Camx KMD log Debug

2.1.kernel log 配置文件

kernel log 配置文件路徑如下：
/sys/module/cam_debug_util/parameters/debug_mdl

2.2 Camx KMD log Group

Camx KMD log控制采用32位二進(jìn)制數(shù)值進(jìn)行控制開關(guān)。
0000 0000 0000 0000 0000 0000 0000 0000

Camx KMD Log Group 舉例如下：

#define CAM_CDM        (1 << 0)    /0x1      //Camera 數(shù)據(jù)傳輸 Camera data mover
#define CAM_CORE       (1 << 1)    /0x2 
#define CAM_CPAS       (1 << 2)    /0x4  //Camera 外設(shè)  Camera peripherals and support
#define CAM_ISP        (1 << 3)    /0x8  //圖像信號處理器 Image single processer
#define CAM_CRM        (1 << 4)    /0x10     //Camera 請求管理 Camera request manager
#define CAM_SENSOR     (1 << 5)    /0x20    
#define CAM_SMMU       (1 << 6)    /0x40     //共享內(nèi)存管理單元 Shared Memory management unit
#define CAM_SYNC       (1 << 7)    /0x80    
#define CAM_ICP        (1 << 8)    /0x100    //圖像控制處理器 Image control processer
#define CAM_JPEG       (1 << 9)    /0x200   
#define CAM_FD         (1 << 10)   /0x400   
#define CAM_LRME       (1 << 11)   /0x800    //低運(yùn)動估算 Low reolution motion estiamtion
#define CAM_FLASH      (1 << 12)   /0x1000  
#define CAM_ACTUATOR   (1 << 13)   /0x2000  
#define CAM_CCI        (1 << 14)   /0x4000    //camera 控制接口 Camera control interface eg:i2c gpio
#define CAM_CSIPHY     (1 << 15)   /0x8000    //Camera 串口處理接口 Camera serial interface eg: MIPI
#define CAM_EEPROM     (1 << 16)   /0x10000
#define CAM_UTIL       (1 << 17)   /0x20000
#define CAM_HFI        (1 << 18)   /0x40000  //Camera 固件接口 Host-firmware interface
#define CAM_CTXT       (1 << 19)   /0x80000
#define CAM_OIS        (1 << 20)   /0x100000
#define CAM_RES        (1 << 21)   /0x200000  //Camera shared resource API
#define CAM_MEM        (1 << 22)   /0x400000

/* CAM_IRQ_CTRL: For events in irq controller */
#define CAM_IRQ_CTRL   (1 << 23)   /0x800000

/* CAM_REQ: Tracks a request submitted to KMD */
#define CAM_REQ        (1 << 24)   /0x1000000

/* CAM_PERF: Used for performance (clock, BW etc) logs */
#define CAM_PERF       (1 << 25)   /0x2000000
#define CAM_CUSTOM     (1 << 26)   /0x4000000
#define CAM_PRESIL     (1 << 27)   /0x8000000

比如:
打開 CAM_ISP CAM_SENSOR CAM_ICP

                       CAM_ICP  CAM_SENSOR  CAM_ISP
 0    0    0    0    0    1       2           8     = 0x128
0000 0000 0000 0000 0000 0001    0010        1000 

adb 調(diào)試命令如下

adb root
adb remount
adb shell “echo 0x128 > /sys/module/cam_debug_util/parameters/debug_mdl”
adb shell cat /proc/kmsg > name_of_kmd_logs.txt

2.3 更多kernel log

需要參考 80-p9301-61_p_qualcomm_spectra_linux_camera_debugging_user_guide.pdf 這個文檔

三、常用縮寫解釋

部分camera 縮寫請參考下面表格

四、參考文獻(xiàn)

1.80-p9301-61_p_qualcomm_spectra_linux_camera_debugging_user_guide.pdf

2.【騰訊文檔】Camera學(xué)習(xí)知識庫https://docs.qq.com/doc/DSWZ6dUlNemtUWndv