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
Download Manager was introduced in Android 2.3. As a service to optimize the processing of long-time download operations. Download Manager ensures that every download succeeds by handling HTTP links, monitoring link changes, and system startup.Download the file;public void F
There are many formulas for calculating pi pai in history, in which Gregory and Leibniz found the following formula:
Pai = 4* (1-1/3+1/5-1/7 ...)
The formula is simple and graceful, but in a bad way, it converges too slowly.
If we rounded to keep its two decimal digits,
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
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
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
Because the Ubuntu linux12.04 virtual environment on the disc requires the CPU to support virtualization, some PCs may not be able to successfully open the virtualization environment, and AMD's CPU may not. But it doesn't matter. The disc containsSource code(Sources directory ). You only needCodeIn the/root/DRIVERS directory of Ubuntu Linux, open the common. Sh file in the source code root directory, and find the following line.
Ubuntu_kernel_path =/usr/src/linux-headers-3.2.0-29-generic
C
? Learn the purpose of Android source codeUnderstanding the Android APIFind API (Activity, Content provider, etc.)Advanced application development (ROM customization)? Download Android source code on different platformsWindowsMac OS XLinux (Recommended for Ubuntu Linux10.04 Lts and above)?
The Download manager is introduced in android 2.3 as a service to optimize the processing of long Download operations. Download Manager ensures that each Download is successful by handling HTTP links, monitoring link changes, and system restart.
Some students found that the CPU does not support virtualization when installing the virtual environment with the book CD, so I made a virtual environment that does not require virtualization, using virtual box, UBUNTU linux10.04 lts (around 4 GB)
You can download and use it if necessary. This virtual environment contains the lab environment required in the book (except for AndroidSource code, Too big, you need to write it yourself, otherwise it will
With Π/4≈1-1/3 + 1/5-1/7 + ... The formula finds the approximate value of π until the absolute value of an item is found to be less than 10^6. #include "C language" with Π/4≈1-1/3 +
With Π/4≈1-1/3 + 1/5-1/7 + ... The formula asks for the approximate value of π until the absolute value of an item is found to be less than 10^6.
#include
Problem: write program in C language to seek 1-1/3+1/5-1/7+ ...Example:1#include 2 voidMain () {3 intn=1;4 floatsum=0, a=1;5 while(a -){6sum=sum+n/A;7n=-N;8a=a+2;9 }Tenprintf"%f\n", sum); One}Analysis:The summatio
There are many formulas in the history of Pi Pai, in which Gregory and Leibniz found the following formula:Pai = 1-1/3+1/5-1/7 (...)This formula is simple and graceful, but in the ointment, it converges too slowly.If we rounded up the two decimal places that kept it, then:Ac
# Include Using namespace STD;Int yuanzhou (INT );Int main (){Int N;Double temp, sum = 0;Cout Cin> N;For (INT I = 1; I {If (I % 2 = 0){Temp = (-1.0/yuanzhou (I); // The result of division between two int types is automatically converted to int type.} Else{Temp = (1.0/yuanzhou (I); // implicit type conversion}Sum + = temp;}Cout Return 0;}Int yuanzhou (INT index){If (index {Return-1;} Else{Return (2 * index-
changes and rework. 2. teammates paid more attention to the design and thinking before development. 3. I thoroughly understood the essence of "never cut firewood by mistake. since the construction period is 8 days, we can use the construction period without compromise, while ensuring the quantity and quality. For leaders: 1. The behavior of teammates is suspected of passive absenteeism. 2. If the original 8-day construction period is completed in 3 d
In order to omit the space and make it visible to the operator who manually fills in the paper, the volume number on the card of the materials shelf is determined to be classified and sorted, as shown in
A-3, A-4, A-5, A-8 forming A-3 ~ 5, 8, etc.
The following code uses a few auxiliary list
/// /// Similar to 1, 2, 3, 5, 7, 8, 10, 11, 12, 13, 14, 15, 16, 21, 22, convert to
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