linux device drivers programming at kernel level

Linux kernel module programming problems-General Linux technology-Linux programming and kernel information, the following is a detailed description. I use the ubuntu system. If

member value in the book struct, you can do this:struct Book a = {. Value = 10.99};You can use the initialization project in any order:Click (here) to collapse or open struct Book gift = { . Value = 25.90, . Author = "Li Cong", . title = "Love Linux", }; As with arrays, a regular initialization project followed by an initialization project provides an initial value for the member following the specified member. In ad

Linux Kernel programming (replace printk) 5-Linux general technology-Linux programming and kernel information. The following is a detailed description. 9. Replace printk's At the beginn

Linux Kernel programming (scheduling task) 8-Linux general technology-Linux programming and kernel information. The following is a detailed description. 10. Schedule a task Often, we ha

unified format, such as PCM, and sends it to the USB sound card through the USB interface of the host computer, and the USB interface of the sound card transfers the parallel audio data to serial through the I2S interface Then sent to the audio codec chip for D/a conversion, can be in the audio chip connected speakers to pronounce. 3. Programming let's look at the USB audio device driver and the next artic

From: http://hi.baidu.com/liu_bin0101/blog/item/02ff1afc043443f5fd037f95.html 2.6.xx kernel is very different from 2.4.xx kernel programming. The following text briefly describes how to implement the kernel module (Hello World) in 2.6.xx. Environment: Ubuntu 704Kernel: 2.6.20-15-generic, which can be viewed through u

Linux Kernel module programming-Job Scheduling-Linux general technology-Linux programming and kernel information. The following is a detailed description. Often, we have 'housework mana

Use kernel programming in Linux to implement scheduling tasks-general Linux technology-Linux programming and kernel information. The following is a detailed description. Schedule a task

kernel State based on NetFilter constructs SKB data packetThe previous fourth article introduces the NetFilter hook mechanism, we know that packets in the protocol stack pass through different hook points, and each hook point is NetFilter pre-registration a series of hook callback function, Each packet passes through the processing of these hook functions. In the hook callback function, you can do anything that you can customize and then load in as a

Linux Kernel module programming helloworld small program solution-general Linux technology-Linux programming and kernel information, the following is a detailed description. Author: Sof

1. API interface Request Gpio Port int gpio_request (unsigned gpio, const char *label) free Gpio port void Gpio_free (unsigned gpio)Determine if the GPIO index number is valid (Gpio port exists) int gpio_is_valid (int number); Set Output: int gpio_direction_output (unsigned gpio, int value) Set Input: int gpio_direction_input (unsigned gpio) Converts the Gpio port to the corresponding interrupt number int Gpio_to_irq (unsigned gpio); Interrupt Request REQUEST_IRQ2. Code path:2.1

Linux signal Programming Practice (3) Signal Representation in the kernel (sigaction sigqueue) Representation of signals in the kernel The processing action of the actually executed signal is called the Delivery, the State between the signal generation and the Delivery, and the Pending ). A process can Block a signal.

(struct __kfifo *fifo, 127 const void *buf, unsigned int len)//buf points to the buffer in which the request was queued, Len represents the size of the requested write /c2> 128 { 129 unsigned int l; 131 L = kfifo_unused (FIFO); //Calculate the size of the remaining space in the queue, fifo->size-(fifo->in-fifo->out) if (len > L) 133 len = l; 135 kfifo_copy_in (FIFO, buf, Len, fifo->in); 136 Fifo->in + = Len; 137 return Len; 138} The clever thing about Kfifo is that in

target file does not define the symbol, then its properties will be in the link process other target files. (This is implemented by setting the N_ext field for the symbol symbols)10,. int expressionsSet 0 or more integer values in a zone, and each comma-separated value is the run-time value11.. lcomm symbol, lengthThe local common areas specified for symbol symbols retain space of length bytes,12,. Long expressionsWith. int13,. Octa BignumsSpecifies a 16-byte large number (. Byte. Word. Quad. O

Linux Kernel programming: Starting from hello world-(3) _ run, hello_run /** File: test. c * Author: David Lin * Date: 2014-12-07pm * Email: linpeng1577@163.com or linpeng1577@gmail.com * world: the city of SZ, in China * Ver: 000.000.001 * history: editor time do * 1) linPeng 2014-12-07 created this file! * 2 )*/ 1. Get the root permission: su root; 2. make

The file is represented in the kernel by three data structures(1) File Descriptor chart: The file descriptor is a struct array, and the subscript of the array is the file descriptor returned by the Open function.There are two fields for each record in the file descriptor* File Descriptor Flags* File Table entry pointer(2) File Table entry: usually contains content* File-like flag, read, write, append, sync, block, non-blocking, etc.* Current file offs

/**file:test.c*author:davidlin *Date:2014-12-07pm *Email:[emailprotected]or[emailprotected] *world:thecityofsz,inchina *Ver:000.000.001 *history:editortime do *NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;1) linpeng 2014-12-07createdthisfile! *NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;2) */ #include Linux kernel programming: Starting with Hello World-(1) _c file wr

#/* # *file : makefile# *author : Davidlin # *date : 2014-12-07pm # *email : [Email protected] or [email protected] # *world : The city of SZ, in China # *ver : 000.000.001 # *history : editor time do # * 1) Linpeng 2014-12-07 created this file! # * 2) # */ . Phony:all cleanobj-m: = test.okerneldir? = lib/modules/$ (Shell uname-r)/buildpwd: = $ (shell pwd) All: make-c $ (KERN Eldir) m=$ (pwd) Modulescl

/* *file : test.c *author : Davidlin *date : 2014-12-07pm *email : [Email protected] or [ Email protected] *world : The city of SZ, in China *ver : 000.000.001 *history: Editor Time do * 1) Linpeng 2014-12-07 created this file! * 2) * /#include Linux kernel programming: Star

#/*#*file:makefile#*author: davidlin#*date:2014-12-07pm #*email:[emailprotected]or[email protected]#*world:thecity ofsz,inchina#*ver: 000.000.001#*history: editortime do#* NBSP;NBSP;1) linpeng2014-12-07 Createdthisfile!nbSP;NBSP;NBSP;NBSP;NBSP;#NBSP;*NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;NBSP;2) #*/. phony:allcleanobj-m:=test.okerneldir?=lib/modules/$ (shelluname -R)/buildpwd:=$ (SHELLNBSP;PWD) all:make-c$ (KERNELDIR) M=$ (PWD) modulesclean:make-c$ (kerneldir) m=$ (PWD) clean#/* endofmak