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Android deep exploration and HAL-driven development (Volume 1)-Chapter 7, android-driven developmentRelationship between applications, libraries, kernels, and drivers From top to bottom, a software system can be divided into applications, libraries, operating systems (kernels), and drivers. Developers can focus on what

Android Deep Explore ( vol. 1) HAL with Driver Development Learning notes (7)The seventh chapter controls the light emitting diode LED Driver Implementation principle 2. writing LED Drivers* Create LED -driven device files• Initialize cdev with the cdev_init function• Specify the device number• Use

Implementation of Camera Real-Time Filter on Android platform (7) -- Basic filter creation method (1) Regarding how to make filters, zhihu's top ticket in this Q A gave a professional answer In addition, InstagramFilters, an open-source project of githunb, once provided some filter code of the first version of Instagram, which is less than 20 types. GPUImage als

Preface Here we have accumulated some uncommon and practical code, which is collected every seven updates, hoping to be useful to everyone. Statement You are welcome to repost, but please keep the original source of the article :)Blog: http://www.cnblogs.com Farmer's uncle: http://over140.cnblogs.com Body 1. Precisely obtain the screen size (for example, 3.5, 4.0, 5.0) Public static double getScreenPhysicalSize (Activity ctx ){ DisplayMetrics dm = n

GPB1;Control LEDs need to be completed by 3 registers;Each register can use 4 bytes;Use the low 16 bits of the Gpmcon register to set the two port properties of the LEDs to output;Low 4-bit control LED is illuminated using the GPMDAT register;Use the low 8 bits of the GPMPUD register to turn on the LED light's pull-up circuit respectively.Control LEDControlling LEDs by string: Using the command line or through the Write functionControl led via I/O command: via the IOCTL functionModule parameter

Due to project requirements, I recently started reading Android books. Although Google released Android Studio, its stability needs to be enhanced, so it chose the safest Development Environment ADT. Because my system is Windows 7x64, the ADT below is also x64. The following are the problems and solutions I encountered when configuring the development environment. 1