2. DVP 使用¶
2.1. 板载资源¶
Firefly-RK3288-Reload 开发板带有一个 DVP 摄像头接口。本文以 OV5640 摄像头为例，讲解在该开发板上的配置过程。
2.2. 相关代码目录¶
与摄像头相关的代码目录如下：
Android：
`- hardware/rockchip/camera
|- Config
| `- cam_board_rk3288.xml # 摄像头的参数设置
|- CameraHal # 摄像头的 HAL 源码
`- SiliconImage # ISP 库，包括所有支持模组的驱动源码
`- isi/drv/OV5640 # OV5640 模组的驱动源码
`- calib/OV5640.xml # OV5640 模组的调校参数
kernel
|- kernel/drivers/media/video/rk_camsys # CamSys 驱动源码
`- kernel/include/media/camsys_head.h
2.3. 配置原理¶
设置摄像头相关的引脚和时钟，即可完成配置过程。 从以下摄像头接口原理图可知，需要配置的引脚有：VCC28_DVP、VCC18_DVP、VCCIO_YUV、PWDN(FLASH0_CLE)、RESET 和 XCLK1。
PWDN、RST 对应 GPIO3_B4、GPIO2_B7 引脚
2.4. 配置步骤¶
2.4.1. 配置 Android¶
修改 hardware/rockchip/camera/Config/cam_board_rk3288.xml 来注册摄像头：
<?xml version="1.0" ?>
<BoardFile>
<BoardXmlVersion version="v0.0xd.0"></BoardXmlVersion>
<CamDevie>
<HardWareInfo>
<Sensor>
<SensorName name="OV5640" ></SensorName>
<SensorDevID IDname="CAMSYS_DEVID_SENSOR_2"></SensorDevID>
<SensorHostDevID busnum="CAMSYS_DEVID_MARVIN" ></SensorHostDevID>
<SensorI2cBusNum busnum="3"></SensorI2cBusNum>
<SensorI2cAddrByte byte="2"></SensorI2cAddrByte>
<SensorI2cRate rate="100000"></SensorI2cRate>
<SensorMclk mclk="24000000"></SensorMclk>
<SensorAvdd name="NC" min="0" max="0"></SensorAvdd>
<SensorDovdd name="NC" min="18000000" max="18000000"></SensorDovdd>
<SensorDvdd name="NC" min="0" max="0"></SensorDvdd>
<SensorGpioPwdn ioname="RK30_PIN3_PB4" active="1"></SensorGpioPwdn>
<SensorGpioRst ioname="RK30_PIN2_PB7" active="0"></SensorGpioRst>
<SensorGpioPwen ioname="RK30_PIN0_PB3" active="1"></SensorGpioPwen>
<SensorFacing facing="front"></SensorFacing>
<SensorInterface mode="CCIR601"></SensorInterface>
<SensorMirrorFlip mirror="0"></SensorMirrorFlip>
<SensorOrientation orientation="0"></SensorOrientation>
<SensorPowerupSequence seq="1234">
<SensorFovParemeter h="60.0" v="60.0"></SensorFovParemeter>
<SensorAWB_Frame_Skip fps="15"></SensorAWB_Frame_Skip>
<SensorPhy phyMode="CamSys_Phy_Cif" sensor_d0_to_cif_d="0" cif_num="0" sensorFmt="CamSys_Fmt_Raw_10b"></SensorPhy>
</Sensor>
<VCM>
<VCMDrvName name="NC"></VCMDrvName>
<VCMName name="NC"></VCMName>
<VCMI2cBusNum busnum="0"></VCMI2cBusNum>
<VCMI2cAddrByte byte="0"></VCMI2cAddrByte>
<VCMI2cRate rate="0"></VCMI2cRate>
<VCMVdd name="NC" min="0" max="0"></VCMVdd>
<VCMGpioPwdn ioname="NC" active="0"></VCMGpioPwdn>
<VCMGpioPower ioname="NC" active="0"></VCMGpioPower>
<VCMCurrent start="20" rated="80" vcmmax="100" stepmode="13" drivermax="100"></VCMCurrent>
</VCM>
<Flash>
<FlashName name="NC"></FlashName>
<FlashI2cBusNum busnum="0"></FlashI2cBusNum>
<FlashI2cAddrByte byte="0"></FlashI2cAddrByte>
<FlashI2cRate rate="0"></FlashI2cRate>
<FlashTrigger ioname="NC" active="1"></FlashTrigger>
<FlashEn ioname="NC" active="1"></FlashEn>
<FlashModeType mode="0"></FlashModeType>
<FlashLuminance luminance="0"></FlashLuminance>
<FlashColorTemp colortemp="0"></FlashColorTemp>
</Flash>
</HardWareInfo>
<SoftWareInfo>
<AWB>
<AWB_Auto support="1"></AWB_Auto>
<AWB_Incandescent support="1"></AWB_Incandescent>
<AWB_Fluorescent support="1"></AWB_Fluorescent>
<AWB_Warm_Fluorescent support="1"></AWB_Warm_Fluorescent>
<AWB_Daylight support="1"></AWB_Daylight>
<AWB_Cloudy_Daylight support="1"></AWB_Cloudy_Daylight>
<AWB_Twilight support="1"></AWB_Twilight>
<AWB_Shade support="1"></AWB_Shade>
</AWB>
<Sence>
<Sence_Mode_Auto support="1"></Sence_Mode_Auto>
<Sence_Mode_Action support="1"></Sence_Mode_Action>
<Sence_Mode_Portrait support="1"></Sence_Mode_Portrait>
<Sence_Mode_Landscape support="1"></Sence_Mode_Landscape>
<Sence_Mode_Night support="1"></Sence_Mode_Night>
<Sence_Mode_Night_Portrait support="1"></Sence_Mode_Night_Portrait>
<Sence_Mode_Theatre support="1"></Sence_Mode_Theatre>
<Sence_Mode_Beach support="1"></Sence_Mode_Beach>
<Sence_Mode_Snow support="1"></Sence_Mode_Snow>
<Sence_Mode_Sunset support="1"></Sence_Mode_Sunset>
<Sence_Mode_Steayphoto support="1"></Sence_Mode_Steayphoto>
<Sence_Mode_Pireworks support="1"></Sence_Mode_Pireworks>
<Sence_Mode_Sports support="1"></Sence_Mode_Sports>
<Sence_Mode_Party support="1"></Sence_Mode_Party>
<Sence_Mode_Candlelight support="1"></Sence_Mode_Candlelight>
<Sence_Mode_Barcode support="1"></Sence_Mode_Barcode>
<Sence_Mode_HDR support="1"></Sence_Mode_HDR>
</Sence>
<Effect>
<Effect_None support="1"></Effect_None>
<Effect_Mono support="1"></Effect_Mono>
<Effect_Solarize support="1"></Effect_Solarize>
<Effect_Negative support="1"></Effect_Negative>
<Effect_Sepia support="1"></Effect_Sepia>
<Effect_Posterize support="1"></Effect_Posterize>
<Effect_Whiteboard support="1"></Effect_Whiteboard>
<Effect_Blackboard support="1"></Effect_Blackboard>
<Effect_Aqua support="1"></Effect_Aqua>
</Effect>
<FocusMode>
<Focus_Mode_Auto support="0"></Focus_Mode_Auto>
<Focus_Mode_Infinity support="0"></Focus_Mode_Infinity>
<Focus_Mode_Marco support="0"></Focus_Mode_Marco>
<Focus_Mode_Fixed support="0"></Focus_Mode_Fixed>
<Focus_Mode_Edof support="0"></Focus_Mode_Edof>
<Focus_Mode_Continuous_Video support="0"></Focus_Mode_Continuous_Video>
<Focus_Mode_Continuous_Picture support="0"></Focus_Mode_Continuous_Picture>
</FocusMode>
<FlashMode>
<Flash_Mode_Off support="1"></Flash_Mode_Off>
<Flash_Mode_On support="1"></Flash_Mode_On>
<Flash_Mode_Torch support="1"></Flash_Mode_Torch>
<Flash_Mode_Auto support="1"></Flash_Mode_Auto>
<Flash_Mode_Red_Eye support="1"></Flash_Mode_Red_Eye>
</FlashMode>
<AntiBanding>
<Anti_Banding_Auto support="1"></Anti_Banding_Auto>
<Anti_Banding_50HZ support="1"></Anti_Banding_50HZ>
<Anti_Banding_60HZ support="1"></Anti_Banding_60HZ>
<Anti_Banding_Off support="1"></Anti_Banding_Off>
</AntiBanding>
<HDR support="1"></HDR>
<ZSL support="1"></ZSL>
<DigitalZoom support="1"></DigitalZoom>
<Continue_SnapShot support="1"></Continue_SnapShot>
<PreviewSize width="800" height="600"></PreviewSize>
<DV>
<DV_QCIF name="qcif" width="176" height="144" fps="10" support="1"></DV_QCIF>
<DV_QVGA name="qvga" width="320" height="240" fps="10" support="1"></DV_QVGA>
<DV_CIF name="cif" width="352" height="288" fps="10" support="1"></DV_CIF>
<DV_VGA name="480p" width="640" height="480" fps="10" support="1"></DV_VGA>
<DV_480P name="480p" width="720" height="480" fps="10" support="0"></DV_480P>
<DV_720P name="720p" width="1280" height="720" fps="10" support="0"></DV_720P>
<DV_1080P name="1080p" width="1920" height="1080" fps="10" support="0"></DV_1080P>
</DV>
</SoftWareInfo>
</CamDevie>
</BoardFile>
主要修改的内容如下：
Sensor 名称
<SensorName name="OV5640" ></SensorName>
该名字必须与 Sensor 驱动的名字一致,目前提供的 Sensor 驱动格式如下： libisp_isi_drv_OV5640.so 用户可在编译 Android 完成后在目录 out/target/product/rk3288_box/system/lib/hw/ 下找到该摄像头驱动文件。
Sensor 软件标识
<SensorDevID IDname="CAMSYS_DEVID_SENSOR_2"></SensorDevID>
注册标识不一致即可,可填写以下值：
CAMSYS_DEVID_SENSOR_1A
CAMSYS_DEVID_SENSOR_1B
CAMSYS_DEVID_SENSOR_2
采集控制器名称
<SensorHostDevID busnum="CAMSYS_DEVID_MARVIN" ></SensorHostDevID>
目前只支持：
CAMSYS_DEVID_MARVIN
Sensor 所连接的主控 I2C 通道号
<SensorI2cBusNum busnum="3"></SensorI2cBusNum>
具体通道号请参考摄像头原理图连接主控的 I2C 通道号。
Sensor 寄存器地址长度,单位：字节
<SensorI2cAddrByte byte="2"></SensorI2cAddrByte>
Sensor 的 I2C 频率,单位：Hz，用于设置 I2C 的频率。
<SensorI2cRate rate="100000"></SensorI2cRate>
Sensor 输入时钟频率, 单位：Hz，用于设置摄像头的时钟。
<SensorMclk mclk="24000000"></SensorMclk>
Sensor AVDD 的 PMU LDO 名称。如果不是连接到 PMU，那么只需填写 NC。
<SensorAvdd name="NC" min="0" max="0"></SensorAvdd>
Sensor DOVDD 的 PMU LDO 名称。
<SensorDovdd name="NC" min="18000000" max="18000000"></SensorDovdd>
如果不是连接到 PMU，那么只需填写 NC。注意 min 以及 max 值必须填写，这决定了 Sensor 的 IO 电压。
Sensor DVDD 的 PMU LDO 名称。
<SensorDvdd name="NC" min="0" max="0"></SensorDvdd>
如果不是连接到 PMU，那么只需填写 NC。
Sensor PowerDown 引脚。
<SensorGpioPwdn ioname="RK30_PIN3_PB4" active="1"></SensorGpioPwdn>
直接填写名称即可，active 填写休眠的有效电平。
Sensor Reset 引脚
<SensorGpioRst ioname="RK30_PIN2_PB7" active="0"></SensorGpioRst>
直接填写名称即可，active 填写复位的有效电平。
Sensor Power 引脚。
<SensorGpioPwen ioname="RK30_PIN0_PB3" active="1"></SensorGpioPwen>
直接填写名称即可, active 填写电源有效电平。
选择 Sensor 作为前置还是后置。
<SensorFacing facing="front"></SensorFacing>
可填写 “front” 或 “back”
Sensor 的接口方式
<SensorInterface mode="CCIR601"></SensorInterface>
可填写如下值：
CCIR601
CCIR656
MIPI
SMIA
Sensor 的镜像方式
<SensorMirrorFlip mirror="0"></SensorMirrorFlip>
目前暂不支持。
Sensor 的角度信息
<SensorOrientation orientation="0"></SensorOrientation>
物理接口设置
<SensorPhy phyMode="CamSys_Phy_Cif" sensor_d0_to_cif_d ="0" cif_num="0" sensorFmt="CamSys_Fmt_Raw_10b"></SensorPhy>
phyMode： Sensor 接口硬件连接方式，DVP Sensor 接口则为：CamSys_Phy_Cif
sensor_d0_to_cif_d：Sensor DVP 输出数据位 D0 对应连接的主控 DVP 接口的数据位号码
cif_num：Sensor DVP 连接到主控 DVP 接口编号
sensorFmt：Sensor 输出的数据格式,目前版本仅支持填写 CamSys_Fmt_Raw_10b
2.4.2. 编译¶
在内核源码目录下执行命令：
make menuconfig
然后将以下配置项打开：
Device Drivers --->
<*>Multimedia support --->
<*>camsys driver
RockChip camera system driver --->
<*> camsys driver for marvin isp
< > camsys driver for cif
最后执行：
make firefly-rk3288-reload.img
即可完成内核的编译。