Author: Liu Hongtao,Hua Qing vision embedded college lecturer.
Note:Understanding the camera driver requires four prerequisites:1) The basic working principle of the camera and the working principle of the camera controller integrated with s5pc1002) working principles of platform_device and platform_driver3) Linux kern
As a common consumer commodity, digital camera its basic principle is to use CCD optical coupling device to convert the light signal into electrical signals, after a/D conversion, data compression and so on through the serial port or USB port in the PC-side application control of the picture (mostly JPEG format) to the PC's hard drive.
The current PC-side applications are provided by the
Abstract:A high-resolution digital camera based on USB2.0 protocol is introduced. The basic hardware circuit and software design method of high-resolution digital camera are presented by using CMOS image sensor ob9620 and USB controller CY7C68013.
USB2.0; I2C; camera
In the first half of this year, I transplanted a Linux driver to a common vimicro camera on the market to an Embedded Development Board. The development environment is:
Compile: Cross 3.3.2
CPU: Intel PXA270
Camera type: vimicro zc301p + hv7131r
The driver source code used is based on the free software s
This series is divided into 3-4 articles, because too many articles will be messy.
V4l2 video drivers mainly involve the following knowledge points:
Camera knowledge (You can view the chip manual provided by the camera manufacturer.)
You need to know the features of the selected camera, including the access control method, configuration methods of various parame
The first time I bought something from a Japanese devil nnd, I was not happy with the sweat.
It is a pity that a ghost camera does not support 2003 after it is purchased. I won't talk about why I bought a ghost camera. I don't need to talk about anything I bought now.
Yesterday, Christmas was supposed to be cheaper, so I promised my girlfriend that I had bought her favorite
measure whether each pin of the camera is correctly connected to the chip before the development driver. Otherwise, the image will not be visible even if the code is correct.
Mt9d111 is an image sensor chip with a CMOS interface. It can sense external visual signals, convert them into digital signals, and output them.
We need to provide the
balanced, do not be anxious. Since the starting point was too high (to start with a generic driver), difficult to grasp the degree of certainty, and there is no basis for their own, so very depressed, but slowly, with the camera-driven understanding, realize that GM is actually very difficult, you need to the various camera
function for fetching a data streamStrminireceivestreamcontrolpacket: For callback functions that control data flowstrminievent: enables data flow to support an eventStrminiclock: callback function for the digital stream clock control.Let's take a look at the driver's workflow:1. Device plugged in, detected by Plug and Play Device Manager;2. The PDO is created and the corresponding IRP is generated;3. The I/O subsystem loads the minidriver and enters
Transferred from: http://blog.163.com/ac952_hmz/blog/static/947915132012101287284/
Drivers, three-point hardware, three-point format, four-point software.In mobile phones, we often refer to the camera directly as sensor, the Spreadtrum platform sensor is like LCD, is already very mature. Follow the previous pattern, first introduce the basic knowledge of hardware.I. Types of sensorIn fact, this for the driver
Author: Liu Xuhui Raymond reprinted. Please indicate the source
Camera Sensor Used on embedded systems, such as mobile phones, is usually controlled by a bus like I2C, and the Controller on the CPU provides the required driver timing, generally, data formats such as YUV and RGB are supporte
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