DVP 使用

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。

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

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

配置步骤

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

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。