motherboard buzzer

. System.map is required when you want to query the location of a symbol name or a symbolic name at a specific location. Find the corresponding address of the function, it can be used;Two: Buzzer driver writing:With the development Board we can see that the buzzer is located on the backplane:View circuit diagram:By looking at the Backplane manual, the buzzer will

1. First look at schematic diagramThe other end of the Beep-m connection is connected to the Mega128a-au PC1In this way, we give PC1 output low time transistor conduction, buzzer rang, PC1 output high, transistor cutoff, buzzer does not ring.The current at both ends of the R501 is measured at 20mA at the on-conductionAt 3V voltage, the output current of the I/O pins is typically 10mAThe manual DC characteri

The buzzer is a hardware device on the s3c6410 Development Board. You can control the buzzer by writing a specific value to the register. This chapter implements a complete buzzer driver (which can be turned on and off) when the driver is implemented differently than the LED PWM drive will consist of multiple files. This is also the standard implementation of mos

:gpio_resetbits (Gpio_led,ds3_pin); /* Light DS3 light */break; Case 3:gpio_resetbits (Gpio_led,ds4_pin); /* Light DS4 light */break; Default:gpio_resetbits (gpio_led,ds1_pin| ds2_pin| ds3_pin| Ds4_pin); /* Light all lights */break; }}///////////////////////////////////int main (void) {/* Enable buzzer to use GPIO clock */Rcc_apb2periphclockcmd (BUZZER_GPIO_CLK, E nable); /* GPIO pin used by the INIT

the mobile power, from the mobile power of the USB is micro-port, Can not connect, need a male-to-male USB cable, there is no way to buy a data cable alone, the module is connected to the same way as other modules, connect the power of the USB port, the above pin has 3.3V, 5V, GND, it is clear, said above, the general module requires VCC and GND, Gpio above these two quantities are limited, you can receive this independent power supply module, out pin normal to the Raspberry Pi Gpio pin, but al

Here I have always encountered a point of error, in the following code to introduceHere I buy the introduction of the buzzer, where VCC is to be connected to the power port, GND connection Gnd,io is GpioHere is the Python code that runsImport Rpi.gpio as GPIOImport timeAddress_gpio = 7 #这里代表的是GPIO引针的地址Gpio.setmode (GPIO). BOARD) #之前是在这里出错, here is a focus, put a picture belowThe #根据我的理解setmod () should mean the encoding mode of the Gpio pin, Gpio.setm

From: http://caiyh.blog.163.com/blog/static/18670512220115152564613/ // ================================================ ===// Name: Main. c// Desc: tq2440pwm Test Procedure// Set the frequency of the buzzer to tout for gpb0.// Turn off the buzzer when the output is low// Change the frequency by changing the clock frequency// ================================================ ===/* The header file contains */

to disable logging on other terminals, redirect the output of this command to the target terminal, as shown below:Code 7.2: Use setterm (bis)# Setterm-blength 0>/dev/vc/1You need to replace/dev/vc/1 with the terminal that you want to disable the ring tones. After logging on to the console, a large number of tabs will be used to automatically complete the operations below the shell prompt. At this time, the machine's buzzer will be non-stop. My collea

The PWM,PWM driver can be opened and stopped by having an I/O command consisting of 3 files: pwm.c, Pwm_fun.h, pwm_fun.c. Where PWM.C is the driver main program. Pwm_fun.h refers to the corresponding header file and defines some macros. The Pwm_fun.c file contains two functions (Pwm_start and Pwm_stop) that open and stop the PWM. After running, from the contents of the makefile file, the compiler first compiles the PWM.C and pwm_fun.c files into PWM.O and PWM_FUN.O, then links the two *.o files

drivers that cannot be uninstalled.Scenario 1: Initialization function crashesBecause the initialization function of the Linux driver (through a function specified by the MODULE_INIT macro) crashes, it causes the initialization function to fail to return normally. The performance of this situation is that the current Linux driver module is not used by any other Linux driver module, but the display has been quoted once.Scenario 2: The Unload function is blockedWhen uninstalling the Linux driver

Hardware platform: tq2440Development environment: Ubuntu-3.11U-boot version: 2014.10This article allows reprint, please specify the source: Http://blog.csdn.net/fulinusFirst, the buzzer ASM Assembler Program:/*********************************************************************** * File:beep. S * version:1.0.0 * copyright:2014 (c) fulinux The program is mainly based on yesterday led. s program has been modified. The makefile file, like yesterday's fi

U-boot-2014.10 transplantation 4th days ---- bare metal buzzer program, uboot2014.10 Transplantation Hardware Platform: tq2440 Development Environment: Ubuntu-3.11 U-boot: 2014.10 This article allows reprint, please indicate the source: http://blog.csdn.net/fulinus I. BUZZER asm Assembler: /*********************************************************************** * File: beep.S * Version: 1.0.0

Article Title: LinuxTips: how to turn off the system buzzer. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Maybe you will encounter a situation like me, every time you use a Linux terminal, when you hear a "beep" sound, I have the urge to tear down my chassis and drag down the built-in beep device. Click "tick"

view the Symbol_producer-driven exported symbols from the/proc/kallsyms file.cat/proc/kallsyms I grep symbol_producerNote: Before you install Symbol_consumer, you need to install Symbol_producer, which is the reverse of the order of two Linux drivers to uninstall. You need to uninstall Symboi_consumer before uninstalling Symbol_producer.Enter the following command to see the dependency between Symbol_prodoucer and Symbol_consumer: Lsmod I grep symbo1.(4) Depmod and Modprobe commands. Where the

s3c6410 is a low power, cost-effective RISC processor from Samsung, which is based on the ARM11 core and can be used in mobile phones and general processing applications. s3c6410 2.5g and 3g 2d acceleration, display processing and scaling, and also integrates a mfc mpeg4/h.263/h.264 codec and vci decode to provide real-time video conferencing and NRSC and pal format tv output. Linux installation configuration and test minicom steps:First step: Detect whether the current

Document directory Basic Principles: Logical operation commands: Comparison command: Basic Principles: Logical operation commands: And r0, R0, #0x01; R0 = R0 0x01 retrieve R0's percentile data ORR r0, R0, # 0xff; R0 = R0 | 0xff LSR logical shift right logic right shift RX, LSR # N or RX, LSR, Rn Register = register> shift EOR logical exclusive or EOR r0, R0, #3 reverse r0, 0 and 1 in Bic (bit clear) Bic r0, # % 0110; note that the binary format is %Comparison command: CMP R1, #10 compare

Http://tieba.baidu.com/p/2089457582 (copy link click to view Zhongguancun black heart merchants) Or you can directly search Baidu Post Bar [Zhongguancun] to view the black-hearted merchants in Zhongguancun. Zhongguancun has been attracting people at a low price. After the machine is split, it is sold at a high price. When you ask about the price on the phone, he will send you a 100-200 message. You have to split the phone and tell you a price. If you do not repair it, at last, it is possible tha

Asus motherboard Bios settings tutorial, Asus motherboard bios tutorial At present, we are not very familiar with the motherboard in our daily life. Next we will briefly introduce some general settings of the motherboard BIOS. ------ (This article is the default task platform) First, press the host power button and

ATX Motherboard Size (x9.6 ', 305x244mm) MINI-ATX motherboard size (11.2 ' x8.2 ', 284x208mm) microATX motherboard size (9.6 ' x9.6 ', 244x244mm) But there are some 24.cmx18.8cm around. Babyat structure Standard first performance in the motherboard transverse width is too narrow (generally 22cm), making direct from

First, to clean up the motherboard for a long time the board will have a thick layer of dust, these dust is caused by the main board problems. Regularly clean the motherboard dust, first unplug the power and then open the chassis, do not touch the motherboard, you should find some larger gold Objects remove their own static electricity, to prevent burnout of th