使用韦老师的imx6ull开发板，通过拓展板，通过杜邦线连接ov2640 摄像头，已成功识别摄像头，pclk 测到=24Mhz，但是无法抓取有效图片（使用桌面摄像头app无法打开预览，使用04_video_get_data抓取的图片），那位大佬帮忙看看什么原因？是不是还有其他设置之类的，csi或者buffer之类的配置
相关配置如下：
设备树：
&csi{
status = “okay”;
port {
csi_ep: endpoint {
remote-endpoint = <&ov2640_ep>;
};
};
};
&i2c1 {
clock-frequency = <100000>;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_i2c1>;
status = “okay”;
ov2640: ov2640@30{
compatible = “ovti,ov2640”;
reg = <0x30>;
status = “okay”;
pinctrl-names = “default”;
pinctrl-0 = <&pinctrl_csi_0>;
clocks = <&clks IMX6UL_CLK_CSI>;
clock-names = “xvclk”;
pwdn-gpios = <&gpio1 04 GPIO_ACTIVE_HIGH>;
resetb-gpios = <&gpio1 03 GPIO_ACTIVE_LOW>;
csi_id = <0>;
mclk = <24000000>;
mclk_source = <0>;
port {
ov2640_ep: endpoint {
remote-endpoint = <&csi_ep>;
bus-width = <8>;
};
};
};
iomux：
MX6UL_PAD_CSI_MCLK__CSI_MCLK 0x1b088
MX6UL_PAD_CSI_PIXCLK__CSI_PIXCLK 0x1b088
MX6UL_PAD_CSI_VSYNC__CSI_VSYNC 0x1b088
MX6UL_PAD_CSI_HSYNC__CSI_HSYNC 0x1b088
MX6UL_PAD_CSI_DATA00__CSI_DATA02 0x1b088
MX6UL_PAD_CSI_DATA01__CSI_DATA03 0x1b088
MX6UL_PAD_CSI_DATA02__CSI_DATA04 0x1b088
MX6UL_PAD_CSI_DATA03__CSI_DATA05 0x1b088
MX6UL_PAD_CSI_DATA04__CSI_DATA06 0x1b088
MX6UL_PAD_CSI_DATA05__CSI_DATA07 0x1b088
MX6UL_PAD_CSI_DATA06__CSI_DATA08 0x1b088
MX6UL_PAD_CSI_DATA07__CSI_DATA09 0x1b088
MX6UL_PAD_GPIO1_IO03__GPIO1_IO03 0x000010B1
MX6UL_PAD_GPIO1_IO04__GPIO1_IO04 0x000010B1
config配置：
CONFIG_VIDEO_EM28XX is not set
CONFIG_V4L_PLATFORM_DRIVERS=y
CONFIG_VIDEO_MXC_OUTPUT=y
CONFIG_VIDEO_MXC_CAPTURE=y
CONFIG_VIDEO_MX8_CAPTURE is not set
CONFIG_VIDEO_V4L2_MXC_INT_DEVICE=y
CONFIG_VIDEO_MXC_CSI_CAMERA=y
CONFIG_MXC_VADC=m
CONFIG_MXC_MIPI_CSI=m
log输出：
ov2640 0-0030: ov2640 Product ID 26:42 Manufacturer ID 7f:a2
i2c i2c-0: OV2640 Probed
CSI: Registered sensor subdevice: ov2640 0-0030
mx6s_capture: module is already loaded