max9286+max96705攝像頭調試--基於imx8qm

一.硬件原理

1.原理圖

2.引腳信息

        	/* max9286 */
			SC_P_MIPI_DSI0_GPIO0_00   攝像頭電源power-gpios
			SC_P_MIPI_CSI0_MCLK_OUT    攝像頭信號觸發，需要26HZ的pwm，gpi-gpios
			SC_P_ADC_IN0         pwn-gpios  
            /* i2c */
            SC_P_MIPI_CSI0_I2C0_SDA
            SC_P_MIPI_CSI0_I2C0_SCL

3.DTS

pinctrl_max9286: csi_pwn{
			fsl,pins = <
				SC_P_MIPI_CSI0_GPIO0_00_LSIO_GPIO1_IO27		0x18000000
				SC_P_MIPI_CSI0_MCLK_OUT_LSIO_GPIO1_IO24		0x18000000	
				SC_P_ADC_IN0_LSIO_GPIO3_IO18	0x18000000
				SC_P_SPDIF0_TX_LSIO_GPIO2_IO15	0x1C000020
				//SC_P_MIPI_DSI1_GPIO0_01_LSIO_GPIO1_IO23		0x1C000000 //Camera_PWR_EN
				SC_P_MIPI_DSI0_GPIO0_00_LSIO_GPIO1_IO18		0x1C000000
			>;
   };
  
 	i2c0_mipi_csi0: i2c@58226000 {

		compatible = "fsl,imx8qm-lpi2c";
		assigned-clocks = <&clk_post IMX8QM_CSI0_I2C0_CLK>;
		assigned-clock-rates = <24000000>;
		status = "okay";
		max9286_mipi@48	 {
			compatible = "maxim,max9286_mipi";
			reg = <0x48>;
			pinctrl-0 = <&pinctrl_max9286>;
			pinctrl-names = "default";
			clocks = <&clk IMX8QM_CLK_DUMMY>;
			clock-names = "capture_mclk";
			mclk = <81000000>;
			mclk_source = <0>;
			pwn-gpios = <&gpio3 18 GPIO_ACTIVE_HIGH>;
			power-gpios = <&gpio1 18 GPIO_ACTIVE_HIGH>;
			gpi-gpios = <&gpio1 24 GPIO_ACTIVE_HIGH>;
			virtual-channel;
			port {
				max9286_0_ep: endpoint {
				remote-endpoint = <&mipi_csi0_ep>;
				data-lanes = <1 2 3 4>;
				};
			};
		};
	};
 
 &isi_0 {
	status = "okay";
};

&isi_1 {
	status = "okay";
};

&isi_2 {
	status = "okay";
};

&isi_3 {
	status = "okay";
};

4.kernel config

CONFIG_IMX8_MEDIA_DEVICE=m
CONFIG_VIDEO_V4L2_SUBDEV_API=y
# CONFIG_USB_GSPCA is not set
CONFIG_V4L_PLATFORM_DRIVERS=y
CONFIG_VIDEO_MXC_CAPTURE=y
CONFIG_VIDEO_MX8_CAPTURE=y
CONFIG_IMX8_CAPTURE_DRIVER=m
CONFIG_IMX8_MIPI_CSI2=m
CONFIG_MXC_CAMERA_OV5640_MIPI_V3=m
CONFIG_GMSL_MAX9286=m
CONFIG_CAMERA_ACTION=m
CONFIG_VIDEO_MXC_CSI_CAMERA=y
CONFIG_MXC_MIPI_CSI=y
CONFIG_MXC_CAMERA_OV5640_MIPI_V2=y
CONFIG_V4L_MEM2MEM_DRIVERS=y

5.驅動文件介紹

6.9286地址配置：

ADD0 ADD1都爲low，所以地址爲0x48

二.如何抓取攝像頭視頻數據

imx-test例程裏面有v4l2將攝像頭的buffer映射到drm的buffer裏面。

mx8_v4l2_cap_drm_64 -cam 1 -fmt RGBP -ow 1280 -oh 720 -fr 30

用法如下：

mx8_v4l2_cap_drm_64
 -num <numbers of frame need to be captured>
 -of save to file 
 -l <device support list>
 -log <log level, 6 will show all message>
 -cam <device index> 0bxxxx,xxxx
 -d "/dev/videoX" if user use this option, -cam should be 1
 -p test performance, need to combine with "-of" option
 -m <mode> specify camera sensor capture mode(mode:0, 1, 2, 3, 4)
 -fr <frame_rate> support 15fps and 30fps
 -fmt <format> support XR24, AR24, RGBP, RGB3, BGR3, YUV4, YM24, YUYV and NV12, only XR24, AR24 and RGBP support playback
 -ow <width> specify output width
 -oh <height> specify output height
 -hflip <num> enable horizontal flip, num: 0->disable or 1->enable
 -vflip <num> enable vertical flip, num: 0->disable or 1->enable
 -alpha <num> enable and set global alpha for camera, num equal to 0~255
example:
./mx8_cap -cam 1        capture data from video0 and playback
./mx8_cap -cam 3        capture data from video0/1 and playback
./mx8_cap -cam 7 -of    capture data from video0~2 and save to 0~2.BX24
./mx8_cap -cam 255 -of  capture data from video0~7 and save to 0~7.BX24
./mx8_cap -cam 0xff -of capture data from video0~7 and save to 0~7.BX24
./mx8_cap -cam 1 -fmt NV12 -of capture data from video0 and save to 0.NV12
./mx8_cap -cam 1 -of -p test video0 performace

 

mek_8q:/ # mx8_v4l2_cap_drm_64 -cam 1 -fmt RGBP -ow 1280 -oh 720 -fr 30
(init_video_channel:499): init channel[0] v4l2_dev_name=/dev/video0 w/h=(1280,720)
(open_drm_device:600): drm device '/dev/dri/card0' does not support dumb buffers
(open_drm_device:607): Open /dev/dri/card1 success
(open_v4l2_device:640): open /dev/video0 success
(modeset_setup_dev:855): DRM bufffer[0] addr=0x0xf8c2eb70d000 size=4147200 w/h=(1920,1080) buf_id=84
(modeset_setup_dev:855): DRM bufffer[1] addr=0x0xf8c2eb318000 size=4147200 w/h=(1920,1080) buf_id=85
(config_video_channel:933): xres=1920, y_res=1080
(v4l2_setup_dev:1071): Get chip ident: imx8_max9286_mipi_0
(v4l2_enum_fmt:1019): index=0 pixelformat=RGBP
(v4l2_enum_fmt:1019): index=1 pixelformat=RGB3
(v4l2_enum_fmt:1019): index=2 pixelformat=BX24
(v4l2_enum_fmt:1019): index=3 pixelformat=BGR3
(v4l2_enum_fmt:1019): index=4 pixelformat=BA24
[ 1410.398430] input fmt YUV4
[ 1410.406431] output fmt RGBP
(v4l2_enum_fmt:1019): index=5 pixelformat=YUYV
(v4l2_enum_fmt:1019): index=6 pixelformat=YUV4
(v4l2_enum_fmt:1019): index=7 pixelformat=NV12
(v4l2_enum_fmt:1019): index=8 pixelformat=YM24
(v4l2_enum_fmt:1019): index=9 pixelformat=XR24
(v4l2_enum_fmt:1019): index=10 pixelformat=AR24
(v4l2_enum_fmt:1019): index=11 pixelformat=UYVY
(v4l2_enum_fmt:1019): index=12 pixelformat=RGB4
(v4l2_enum_fmt:1015): channel VIDIOC_ENUM_FMT fail
(v4l2_setup_dev:1156):  planes=1 WxH@fps = 1280x720@30
(get_memory_map_info:1206): V4L2 buffer[0]->planes[0]:startAddr=0x0xf8c2eb156000, offset=0x0, buf_size=1843200
(get_memory_map_info:1206): V4L2 buffer[1]->planes[0]:startAddr=0x0xf8c2eaf94000, offset=0x1c2000, buf_size

 

三.代碼

指出幾個重要寄存器：

96705：

max9271_write_reg(max9286_data, 0, 0x07, 0x94);

max9271_write_reg(max9286_data, 0, 0x04, 0x43);

max9271_write_reg(max9286_data, 0, 0x42, 0x5F);

9286：

max9286_write_reg(max9286_data, 0x12, 0xF3);

max9286_write_reg(max9286_data, 0x01, 0xE2);

接下來就不公佈了，有不懂的可以留言。