一、目標

本文主要目標是，支持前置攝像頭0v5648、后置攝像頭ov13850，以及移植過程遇到的一些小問題的解決。

1. 攝像頭連接圖

參考上圖，攝像頭詳細信息如下：

• 2個攝像頭均連接在I2C通道4
• 2個攝像頭共用同一個MIPI數(shù)據(jù)通道
• 2個攝像頭各自有獨立的rst、pwdn引腳
• rkw提供的sdk中已經提供camera時鐘的設備樹信息，此處選擇對應時鐘即可
• ov13850用到4個lane，0v5648用到2個lane
• 攝像頭的片選通過select-gpios來選擇，拉低選擇0v13850,拉高選擇ov5684

三、設備樹

根據(jù)上述攝像頭硬件信息，設備樹信息如下：

• reg：該模塊輸入端點序號
• remot-endpoint ：輸出端點的名字，在下面設備樹信息中列舉出來
• data-lanes ：數(shù)據(jù)通道信息

在這里插入圖片描述

四、驅動

rxw sdk中已經有這兩個攝像頭的驅動，但是需要增加片選的邏輯，

根據(jù)前面文章，

《Camera | 4.MIPI攝像頭應用程序編寫》

可知開啟和關閉攝像頭視頻流通過以下命令：

VIDIOC_STREAMON， VIDIOC_STREAMOFF

對應的回調函數(shù)

static int ov5648_s_stream(struct v4l2_subdev *sd, int on)

除此之外，power控制的回調函數(shù)

static int ov5648_s_power(struct v4l2_subdev *sd, int on)

我們只需要在這對應的回調函數(shù)中增加select-gpio的操作即可。

所有修改代碼如下：

+#include <linux/gpio.h>+#include <linux/of_gpio.h>+static int select_gpios;//前置攝像頭使能static int ov5648_s_stream(struct v4l2_subdev *sd, int on){ …… if (on) {+   gpio_direction_output(select_gpios, 1);+   usleep_range(1000, 2000);   …… } else {  ……+   gpio_direction_output(select_gpios, 0);+   usleep_range(1000, 2000);   } ……}static int ov5648_s_power(struct v4l2_subdev *sd, int on){ …… if (on) {+   gpio_direction_output(select_gpios, 1);+   usleep_range(1000, 2000);  …… } else {+   gpio_direction_output(select_gpios, 0);  …… } ……}static void __ov5648_power_off(struct ov5648 *ov5648){ int ret; struct device *dev = &ov5648->client->dev;+  gpio_direction_output(select_gpios, 0); ……}static int ov5648_probe(struct i2c_client *client, ……+ struct device_node *np;++ np = dev->of_node;  ……+ select_gpios = of_get_named_gpio(np, "select-gpios", 0);++ ret = gpio_request(select_gpios, "select-gpios");+ if (ret < 0) {+  dev_err(dev,"Failed to request GPIO:%d, ERRNO:%d", (s32) select_gpios, ret);+  //return ret;+ }+ printk("ov5648 select_gpios=%d",select_gpios); ……

五、拓撲結構

加載成功后查看拓撲結構，會有以下entity 信息：

- entity 70: m01_f_ov5648 4-0036 (1 pad, 1 link)             type V4L2 subdev subtype Sensor             device node name /dev/v4l-subdev3        pad0: Source                [fmt:SBGGR10/2592x1944]                -> "rockchip-csi2-dphy0":0 []- entity 74: m00_b_ov13850 4-0010 (1 pad, 1 link)             type V4L2 subdev subtype Sensor             device node name /dev/v4l-subdev4        pad0: Source                [fmt:SBGGR10/4224x3136]                -> "rockchip-csi2-dphy0":0 [ENABLED]

說明pipe通路ok。

六、xml配置文件

要讓安卓識別前后置攝像頭，還需要在以下文件增加后置攝像頭ov13850、前置攝像頭ov5684信息

@hardware/rockchip/camera/etc/camera/camera3_profiles.xml@hardware/rockchip/camera/etc/camera/camera3_profiles_rk356x.xml

在這兩個xml文件中增加這兩個攝像頭信息即可，

一口君是按照其他攝像頭內容修改的，

ov5684因為分辨率問題，需要注意不要超過最大值。

獲取xml文件，可以后臺回復：rxw

七、切換后，前置攝像頭打不開bug

開機后用命令抓幀，用的是前置攝像頭

打開app后，界面顯示的是后置攝像頭信息

但是點解界面的切換按鈕，獲取不到前置攝像頭圖像，

在不重啟的情況下要操作后置攝像頭，執(zhí)行下面操作即可。

Settings->apps&notificationsSEE ALL 16 APPS選擇最近應用  CameraStorage&cache    點擊    clear storage 然后退出重新打開攝像頭APP即可

1. 錯誤分析

1. 首先在ov5648驅動的加上log

static int ov5648_s_stream(struct v4l2_subdev *sd, int on){ …… on = !!on; printk("6902 %s(%d) enter! %d\n", __func__, __LINE__,on); if (on == ov5648->streaming)  goto unlock_and_return; if (on) {  …… } else {  …… } ov5648->streaming = on;}

發(fā)現(xiàn)切換的時候沒有執(zhí)行該函數(shù)，所以定位是APP測出了問題

2. 查看catlog

03-01 02:40:30.062  1699  1749 I CAM_Profiler: [ 67.906ms] GUARD: CaptureModule.openCameraAndStartPreview() - [67.565ms] mOneCameraOpener.open()03-01 02:40:30.062  1699  1749 I CAM_Profiler: [ 67.906ms] GUARD: CaptureModule.openCameraAndStartPreview() - STOP03-01 02:40:30.063  1699  1741 E CAM_OneCamFtrCnfgCrtr: Unknown support level: 003-01 02:40:30.063  1699  1741 I CAM_OneCamCreator: Camera support level: LIMITED_JPEG03-01 02:40:30.063  1699  1741 W CAM_Log : Tag SimpleOneCameraFactory is 3 chars longer than limit.03-01 02:40:30.063  1699  1741 I CAM_OneCamCreator: Picture Size Configuration: PictureSizeCalculator.Configuration{native size=3264x2448, crop=Rect(0, 0 - 3264, 2448)}03-01 02:40:30.065  1699  1741 D CAM_CaptureModule: onCameraOpened: com.android.camera.one.v2.initialization.GenericOneCameraImpl@200eae903-01 02:40:30.065  1699  1741 D CAM_CaptureModule: picturesize:3264x2448,previewBuffer:1280x96003-01 02:40:30.065  1699  1741 D CAM_CaptureModule: starting preview ...03-01 02:40:30.068  1699  1699 W CAM_IndicatorIconCtrlr: Trying to sync a pano indicator that is not initialized.03-01 02:40:30.068   349   349 W CameraDeviceClient: createSurfaceFromGbp: Camera 1 with consumer usage flag: 256: Forcing asynchronous mode for stream03-01 02:40:30.068   349   349 W CameraDeviceClient: createSurfaceFromGbp: Camera 1: Overriding format 0x1 to IMPLEMENTATION_DEFINED03-01 02:40:30.069   265   265 D Camera3HAL: configure_streams: streams list ptr: 0xf6242dd0, num 2    03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfig: @selectSensorOutputFormat : App stream size(3264x2448) larger than Sensor full size(2592x1944), Check camera3_profiles.xml    03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfigManager: Couldn't get mediaCtl config03-01 02:40:30.070   265  1812 E RkCamera: <HAL> V4L2Subdev: queryDvTimings, ret:-1, I:0, wxh:0x003-01 02:40:30.070   265  1812 E RkCamera: <HAL> V4L2Subdev: VIDIOC_SUBDEV_QUERY_DV_TIMINGS failed: Inappropriate ioctl for device03-01 02:40:30.070   265  1812 E RkCamera: <HAL> PlatformData: Error queryDvTimings ret:-2147483648 (/dev/v4l-subdev3)03-01 02:40:30.070   265  1812 E RkCamera: <HAL> PlatformData: Error closing device (/dev/v4l-subdev3)03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfig: getMediaDevInfo info.model:rkisp003-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfigManager: Couldn't get Imgu mediaCtl config03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2ImguUnit: Processing tasks creation failed (ret = -2147483648)03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2CameraHw: Unable to configure stream for imgunit03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RequestThread: Error configuring the streams @handleConfigureStreams:21303-01 02:40:30.070   265  1812 E RkCamera: <HAL> RequestThread:     error -2147483648 in handling message: 303-01 02:40:30.071   349   349 E Camera3-Device: Camera 1: configureStreamsLocked: Set of requested inputs/outputs not supported by HAL03-01 02:40:30.071   349   349 E CameraDeviceClient: endConfigure: Camera 1: Unsupported set of inputs/outputs provided03-01 02:40:30.071  1699  1741 W CameraDevice-JV-1: Stream configuration failed due to: endConfigure:505: Camera 1: Unsupported set of inputs/outputs provided03-01 02:40:30.072  1699  1741 E CameraCaptureSession: Session 0: Failed to create capture session; configuration failed03-01 02:40:30.072  1699  1817 E CAM_CaptureModule: Could not set up preview.03-01 02:40:30.079  1699  1699 D CAM_LoggingImageReader: Closing: ImageReader{width=3264, height=2448, format=JPEG}03-01 02:40:30.081   349   349 I Camera3-Device: disconnectImpl: E03-01 02:40:30.088   349   349 I Camera3-Device: disconnectImpl: X03-01 02:40:30.094   349   349 I CameraService: disconnect: Disconnected client for camera 1 for PID 1699

其中：

 03-01 02:40:30.070   265  1812 E RkCamera: <HAL> RKISP2GraphConfig: @selectSensorOutputFormat : App stream size(3264x2448) larger than Sensor full size(2592x1944), Check camera3_profiles.xml

提示分辨率不支持，

于是打開camera3_profiles.xml，將所有3264x2448修改為2592x1944

    <jpeg.maxSize value="5038848"/>  <!-- 3264*2448*1.5  2592x1944*1.5= 5038848   --> <sensor.info.activeArraySize value="0,0,2592,1944"/>  <sensor.info.pixelArraySize value="2592x1944"/>  <supportTuningSize value="2592x1944"/>

將下面幾個屬性所有關3264x2448的全部刪除

<scaler.availableStreamConfigurations value="BLOB,3264x2448,OUTPUT,<scaler.availableMinFrameDurations value=<scaler.availableStallDurations value="

2592*1944*1.5= 5038848

八、其他問題

1. 前置攝像頭旋轉了180°

修改xml文件

  <sensor.orientation value="90"/>

2. 閃光燈

 <flash.info.available value="TRUE"/>