1 5 v led flasher

The experiment in this chapter will realize the real Linux driver, which will realize the direct interaction with the hardware. 4 LED lights need to be controlled . the implementation principle of 7.1LED driveIn fact, it is not the Linux driver that writes data directly to the memory in the hardware, but interacts with the native I/O memory. I/o Memory is a mapping of hardware in host memory that is connected to the host through various interfaces.

# Include # Define uchar unsigned char # Define uint unsigned int Sbit Dula = P2 ^ 6; Sbit wela = P2 ^ 7; Sbit led1 = p1 ^ 0; Uchar code table [] = { 0x3f, 0x06, 0x5b, 0x4f, 0x66, 0x6d, 0x7d, 0x07, 0x7f, 0x6f, 0x77, 0x7c, 0x39, 0x5e, 0x79,0x71 }; Void delayms (uint ); Void display (uchar, uchar ); Uchar num, num1, num2, Shi, GE; Void main () { Tmod = 0x01; // set the timer 0 and 1 as the working mode 1 (000

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

Linux driver-LED Drivers _ 1, linuxled_1 Steps: 1. Framework 2. complete hardware operations: A. view the principle diagram and pins B. Check the 2440 manual. C. write code: ioremap is required for the IO port. My board sub-circuit is as follows: 1,Configure GPBCON registersConfiguration output is configured in the op

1. Io Configuration Three registers are required for the configuration of the IOS port of the standard. IO port register P0 P1 P2 Address 0x80 0x90 0xa0 Pxsel P0sel P1sel P2sel Address 0xf3 0xf4 0xf5 Px [] function to set registers. The default is normal IO port (0: normal IO port 1: second function) Pxd

It is said that Apple's new operating system iOS 5 has hundreds of new features, but only a few of them are shown on the official website. Here, we will pick out 24 other "unknown secrets" for iOS 5: 1. Custom Vibration Set different vibration modes for different contacts. users do not need to put their cell phones out of their pockets to know who calls t