hdd led

Gpbcon is used to set the input and output attributes. That is to say, do you want to control LEDs? Now you know that the LED pins are gpb0 and gpb1, and gpbcon controls the attributes of these pins, so now we need to set the attributes of these pins to output to control its flickering. So how to set it? Our pins are gpb0 and gpb1, while gpbcon controls one pin in two places, so it should be 0101 (which is clearly stated here ), the 22-bit low of the

// Led. c # Include # Include # Include # Include Int main (INT argc, char ** argv){Int on;Int led_no;Int FD;/* Check the two parameters of LED control. Exit if no parameter is input. */If (argc! = 3 | sscanf (argv [1], "% d", led_no )! = 1 | sscanf (argv [2], "% d", on )! = 1 | on | Led_no {Fprintf (stderr, "Usage: LEDs led_no 0 | 1/N ");Exit (1 );}/* Open the/dev/LEDs Device File */FD = open ("/dev/LE

1, the scene of the misuse of video choreography and program content in the form of a sense of great conflict 　　 LED ScreenThe continuous upgrading of manufacturing technology, so that many production teams and organizers of the screen "high-definition" features admiringly, in the creative process will be easy to go into the "pound foolish" misunderstanding. In order to reflect the characteristics of high-definition screen, producers are often keen to

emitting diode), LEDs, or LEDs, is a solid-state semiconductor device capable of converting electrical energy into visible light, which can be converted directly into optical. Can be used in the circuit and the instrument as the indicator light, or composed of text or digital display. There are different compounds made of diodes such as arsenic, gallium, phosphorus and other compounds made, different combinations of compounds will show different colors of light.In the design of

LDO current regulator for power LEDChallengeYou ' ve got a power LED? great! Build a flash light!What does the spec say? "voltage:3.6. 3.8 V, Power 3 W. " Okay. This means it draws some. Three Mignon cells give 4.5 V for at least three hours. So we add a resistor of 1.2 ohms and we are safe. If the LED runs at 3.6 v this gives MA and 2.8 W while the resistor voltage are 0.9 v resulting in 0.675 W for the Re

, the liquid crystal by the installation light or light turn dark reaction time, usually in milliseconds Ms units.Visual angle: Most of the light is from the screen perpendicular to the shooting, so from the point of view of the liquid crystal, you can not see the original color, and even can only see all white or All black. To this end, manufacturers have also begun to develop wide-angle technology, such as: Tn+film, IPS (in-plane-switching), MVA (multi-domainvertical AlignMENT) and so on.Pitch

This time change the structure of the notes directly. Lit LEDs are always an introductory routine for learning MCU,ARM,FPGA, which can be said to be a classic routine. The author also started the Arm learning journey from the point of light led.The next step is to light up the LED tour, before you start, you need to explain to the reader: The writer is also an arm beginner, the learning process is also on the Internet to find various materials, and fi

One, the monitor also must combine exertion Because the basic display principle of LED backlight display is the same as that of the traditional CCFL backlight display, it relies on the backlight lamp to illuminate the image on the LCD screen. At the same time, the LCD screen pixel is composed of a large number of LCD, over a long period of continuous use, will make the crystal aging or burn, damage once occurred, we said that the bright spots, bad po

Brief Introduction LED lamp cost is very low, easy to operate, in the embedded product is indispensable, can be used as debugging logo, status indicator, etc., advanced usage can also as a breathing lamp to further enhance its aesthetic nature. This chapter describes only control LED lights, tiny4412 Development Board has four LED lights on the core board for us

LED Electronic display system touched by the products are anti-acid rain, salt spray, waterproof, moisture, dust, anti-incineration, anti-corrosion and other disposal, after salt spray experiment, the results show that: The products are reached the national industrial norms, in accord with the requirements of salt fog test, even under the conditions of oceanic climate, The screen can also be used for a long time. Below, chip photoelectric for you to a

First of all, the implementation of the LED driver principle, the Linux driver is not directly to the memory of the hardware to write data, but with the native I/O memory interaction, each of the hardware connected to Linux in I/O memory will have a map of the first address.To write the driver, first create the LED-driven device file:1. Initialize the Cdev with the Cdev_init functionDescribing the device fi

Linux LED driver test source code-Linux general technology-Linux programming and kernel information, the following is a detailed description. // ■ // [Copyright] Copyright (c) 2006-2008 GLIETHTTP // // [File version] v1.x // // [Creation date] 2006/12/21 // // [Description] LED flashlight drive test-led_driver.c // ■ # Ifndef _ KERNEL __ # Define _ KERNEL __ # Endif # Ifndef MODULE # Define MOD

The last time I introduced how to remotely monitor the indoor temperature, I am very pleased with the enthusiastic response. But then again, the implementation can only be remote monitoring of the temperature in the home. If you find that the home is very hot and want to remotely turn on the air conditioner switch to reduce the temperature in advance, it will not be very good after you go home. How can this be done. The following describes how to implement remote control. Of course, the author's

My system used to enter the login interface before entering the login password when the Num lock LED is always bright, but then I do not know why it is not lit: the NUM LOCK LED is on at startup, but when the scroll bar to 2/3, the NUM LOCK led automatically off, Enter the login interface required to enter the login password, the numeric keypad is not available,

A complete Linux driver consists mainly of internal processing and interaction with hardware. The internal processing mainly refers to the Linux driver loading, unloading, and device file-related action processing and business logic, etc., and the hardware interaction mainly refers to through the IOWRITE32, IOREAD32 and other functions and the hardware registers for data interaction.We want to realize the control led, we should first understand its ex

Seventh chapter LED will blink for me: Control the light-emitting secondary tube-learning notes1. Realization principle of LED driveLinux driver and hardware interaction principle: Linux Drive and I/O memory through the IOREAD30 and IOWRITE32 functions, I/O memory and hardware, memory management module is responsible for synchronizing I/O memory and hardware in Germany data.Explanation: Although the Linux d

For most Linux drivers, the need to interact directly with the hardware, this chapter focuses on the use of Linux drivers to control the light and dark of the diode, that is, the Linux drive to send data control on the Development board LED lights switch.The first section introduces the realization principle of LED driver. The Linux driver does not write data directly to the memory in the hardware, but inte

Original Address http://blog.csdn.net/yuanlulu/article/details/6438847 gpio-led FrameworkThe gpio-led framework is implemented under/DRIVER/LEDS/LEDS-GPIO.C. The role of this gpio-led framework is to register incoming GPIO port information as Led_classdev. Data Structure Gpio LED data structure related to platform equi

files, and the Linux system's devices fall into three categories: character devices, block devices, and network devices. The driver of a character device has a fixed template that primarily writes member functions in the file_operations structure, which will eventually be applied to Linux open (), write (), read (), IOCTL (), Called when a system call such as close ().Driving development functions in the kernel space, application development functions in user space. The following is an example

Raspberry PI Series--bare metal illuminated LED lightsBackgroundRecently just bought Raspberry PI B +, configured to run the official Raspbian system, tossing a week Linux system, feel no meaning, so try to understand the bottom of the start process, through a few days of research, It is found that the boot of the lowest part is performed by the official Bootcore.bin and start.elf files (which should be the initialization of hardware devices, such as