# camera_preview

**Repository Path**: dsqiu/camera_preview

## Basic Information

- **Project Name**: camera_preview
- **Description**: No description available
- **Primary Language**: Unknown
- **License**: Not specified
- **Default Branch**: ingenic-master
- **Homepage**: None
- **GVP Project**: No

## Statistics

- **Stars**: 0
- **Forks**: 0
- **Created**: 2025-04-11
- **Last Updated**: 2025-04-18

## Categories & Tags

**Categories**: Uncategorized

**Tags**: None

## README

# Feedback 摄像头采集数据屏幕回显



## 一、介绍

### 1.1概述

​	该模块功能为，从 camera 端采集数据通过dpu进行数据转换，将数据发送到屏幕显示端，测试时屏幕为spi 屏幕，最终屏幕会呈现 camera 采集的数据内容。

​	camera 的采集数据格式为：yuv422(yuyv)

​	spi 屏幕的显示数据格式为：rgb565

### 1.2 目录结构

```c
.
├── app				// lvgl 应用
├── Build.mk		//工程编译文件
├── CMakeLists.txt	// cmake 编译文件
├── component		// lvgl 源码部分
├── hal				// hal 支持源码
├── include			// 头文件
├── main			// 主程序
└── README.md		// 文档
```


## 二、配置内容

### 2.1 dts 配置

**spi 相关配置**

```c

&spi0 {
	status = "okay";
	pinctrl-names = "default";
	pinctrl-0 = <&spi0_pb_tx>;
	spi-max-frequency = <50000000>;
	num-cs = <1>;
	cs-gpios = <0>;
	/* cs-gpios = <0>, <0>; */
	/* cs-gpios = <&gpb 17 GPIO_ACTIVE_HIGH INGENIC_GPIO_NOBIAS>, <&gpb 16 GPIO_ACTIVE_HIGH INGENI*/
	ingenic,chnl = <0>;
	ingenic,allow_cs_same = <1>;
	ingenic,bus_num = <0>;
	ingenic,has_dma_support = <1>;
	ingenic,spi-src-clk = <1>;/*0.ext; 1.ssi*/

	/* Add SPI interface device */
	st7789p3_spirgb_misc@0 {
		compatible = "ingenic,st7789p3_spirgb_misc";
		status = "okay";
		spi-max-frequency = <25000000>;	// 25M clk
		reg = <0>;
		te-gpio = <&gpb 25 IRQ_TYPE_EDGE_FALLING INGENIC_GPIO_NOBIAS>;
		ingenic,rst-gpio = <&gpb 27 GPIO_ACTIVE_LOW INGENIC_GPIO_NOBIAS>;
		ingenic,lcd-dcx-gpio = <&gpb 1 GPIO_ACTIVE_HIGH INGENIC_GPIO_NOBIAS>;
		// 	ingenic,pintest-gpio = <&gpb 4 GPIO_ACTIVE_HIGH INGENIC_GPIO_NOBIAS>;
		//		ingenic,cs-gpio = <&gpb 0 GPIO_ACTIVE_LOW INGENIC_GPIO_NOBIAS>;
	};
};

```


**dpu 配置**

​	`ingenic,layer-framesize` 至少要大于等于最大分辨率尺寸。

```


&dpu {
	status = "okay";
	ingenic,disable-rdma-fb = <0>;
	ingenic,rot_angle = <0>;
	/*Defines the init state of composer fb export infomations.*/
	ingenic,layer-exported = <0 1 1 0>;
	ingenic,layer-frames   = <3 1 1 2>;
	ingenic,layer-framesize = <1728 1280>, <1728 1280>, <720 1080>, <320 240>;   /*Max framesize for each layer.*/
	layer,color_mode	= <4 6 1 0>;					/*src fmt,*/
	layer,src-size       	= <720 1280>, <720 1280>, <720 1280>, <240 200>;	/*Layer src size should smaller than framesize*/
	layer,target-size	= <720 1280>, <720 1280>, <720 1280>, <240 200>;	/*Target Size should smaller than src_size.*/
	layer,target-pos	= <0 640>, <0 640>, <0 0>, <0 0>;	/*target pos , the start point of the target panel.*/
	layer,enable		= <1 1 1 1>;					/*layer enabled or disabled.*/
	ingenic,logo-pan-layer	= <2>;						/*on which layer should init logo pan on.*/
    layer,z_order = <1 2 3 0>;
	memory-region=<&reserved_memory>;
	lane2_pn_swap;
	lane3_pn_swap;
};

```

### 2.2 kernel 配置

````
symbol: STAGE_PANEL_ST7789P3 [=y]
│ Type  : tristate
│ Defined at module_drivers/drivers/video/fbdev/ingenic/fb_stage_wip/displays/Kconfig:290
│   Prompt: spi panel st7789p3 240*320
│   Depends on: FB_INGENIC [=y] && FB_INGENIC_STAGE_WIP [=y] && FB_INGENIC_DISPLAYS_STAGE_WIP [=y]
│   Location:
│     -> Ingenic device-drivers Configurations
│       -> [LCD] Panel/Touchscreen Drivers
│         -> Ingenic Framebuffer Driver for stage wip (FB_INGENIC_STAGE_WIP [=y])
│           -> display stage wip Supported lcd panels (FB_INGENIC_DISPLAYS_STAGE_WIP [=y])


Symbol: FB_INGENIC_NR_FRAMES [=2]
│ Type  :integer
│ Defined at module_drivers/drivers/video/fbdev/ingenic/Kconfig:27
│   Prompt: how many framessupport
│   Depends on: FB_INGENIC [=y]
│   Location:
│     -> Ingenic device-drivers Configurations
│       -> [LCD] Panel/Touchscreen Drivers
│         -> Ingenic Framebuffer Driver (FB_INGENIC [=y])



Symbol: NOT_USE_LCD_INTERFACE [=y]
│ Type  :bool
│ Defined at module_drivers/drivers/video/fbdev/ingenic/fb_stage_wip/Kconfig:27
│   Prompt: not use lcd interface, using fb frameworks
│   Depends on: FB_INGENIC [=y] && FB_INGENIC_STAGE_WIP [=y]
│   Location:
│     -> Ingenic device-drivers Configurations
│       -> [LCD] Panel/Touchscreen Drivers
│         -> Ingenic Framebuffer Driver for stage wip (FB_INGENIC_STAGE_WIP [=y])

````



### 2.3 impp 配置

该 impp 使用的为 price_impp 库。

需要作出如下修改

```
// 修改为 565 fmt
dpu_osd.framedesc.func_desc.osd_frame.wback_fmt = IMPP_PIX_FMT_RGB_565;
// 修改为 565 fmt
osd->framedesc.func_desc.osd_frame.wback_fmt = osd->rotated == ROTATED_0 ? IMPP_PIX_FMT_RGB_565 : IMPP_PIX_FMT_ROTATE;
```

## 三、编译

编译：

make lvgl-feedback

清除：

make lvgl-feedback-clean

最后编译出 feedback 应用，该应用依赖 impp-pricebase 编译出的 libimpp.so 。impp-pricebase 的编译会在 make feedback 阶段进行执行。



## 四、执行

连接usb摄像头到开发板。

在 串口执行 cam_feedback ，观察屏幕是否有摄像头采集的内容。