led zipline

My blog: http://blog.csdn.net/muyang_ren Function: The Development Board dynamically loads the LED driver module and passes the test program. System: Ubuntu 14.04 Driver cross-compilation kernel: linux-2.6.32.2 // build cross-Compilation Development Board: mini2440 (128 M nandflash) // for how to download Linux to the Development Board, click. For Linux rootfs, select rootfs_rtm_2440.img (Disk Directory: image/Linux/RTM) Tools required for developmen

have their mapping first address. The steps to write the LED driver are as follows: First, create the LED-driven device files: Step one: Initialize the Cdev with the Cdev_init functionStep Two: Specify the device number, and step three: Use the Cdev_add function to add the character device to the character device array in the kernel; the fifth: Create a struct class using the Clascreate macro; Then uninsta

First, the 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.Second, write led driverWhere 1 means open, 0 indicates off. When the string length is less than 4, it is equivalent to

Introduction: PWM for a lot of software engineers may be familiar and unfamiliar with PWM to adjust the LED brightness For example, its essence is in every period of cutting corners, the overall performance of the LED under-voltage brightness of different effects. As you can see the seven color lantern its principle is similar, just with 3 PWM control red, green, blue three colors of the lamp output brightn

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

Development Board: tx2440 Development Environment: ubuntu12.04 In Linux, use Vim to compile program code (startup code, main program, and makefile), and perform cross-compilation in Linux to generate binary arm executable files, the shared directory of VMware is transmitted to the Window environment, and is directly run in arm norflash with jflash. Goals: 1) light up a single LED lamp 2) Light up multiple LED