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In the Rt-thread 2.0.0 formal version of the introduction of PIN devices as miscellaneous devices, its device driver files pin.c in Rt-thread-2.0.1\components\drivers\misc, mainly for the operation of Chip Gpio, such as light led, Keys and so on. At the same time for the corresponding chip platform, you need to write t
============ Problem Description ============I looked at Google's Bluetoothchat demo, where it put Bluetooth to establish a client-side connection is also placed in the sub-thread execution.My current program, Bluetooth to establish the connection step is in the UI thread, but bluetoothsocket receive the data part is in the sub-thread, but now encountered a probl
function occurs when the driver no longer controls the device for a variety of reasons. The calls to both functions are made in the kernel thread.4) USB Skeleton ProgramThe driver/usb/usb-skeleton.c file in the source code of the Linux kernel provides us with one of the most basic USB drivers, the USB skeleton program
Before analyzing the driver, we will analyze the model of the IIC subsystem. There are 2 ways to IIC device drivers, one of which is to write user-driven through a universal driver. The other is to add a IIC device driver directly to the IIC subsystem, such as a
address backfunc () as the parameter through deviceiocontrol () to the device driver. After the device driver obtains the callback function address, it stores it in a global variable (such as Callback) and calls the get_cur_thread_handle () function to obtain the handle of Its Application
initialization, registering input subsystem interface, associated interrupt handler (escalation of three-axis parameters in interrupt processing thread) and so on.A small summary of device drivers for i²cI²c device drivers usually only need to mount in the I²c bus (that is, dependent on the I²C subsystem), I²C subsystem for the
interrupt handler (escalation of three-axis parameters in interrupt processing thread) and so on.A small summary of device drivers for i²cI²c device drivers usually only need to mount in the I²c bus (that is, dependent on the I²C subsystem), I²C subsystem for the device driver
maintained by an IO task Task_struct member Bio_list. It can also be a linked list (the next section) that a struct request belongs to. The following figure shows a linked list of the bio structure through Bi_next links. Each of these bio structures and Segment/page have a one-to-many relationship (note: The graph is intercepted from Professional Linux Kernel architecture, Copyright belongs to the original author), 3.3 struct Request A request logically represents the IO requests received by th
Through the introduction of the previous article, we know that the SPI Universal interface layer is used to connect the specific SPI device protocol driver and SPI Controller driver, the general interface layer in addition to the protocol driver and controller driver to prov
After two weeks of exploration, I finally had a preliminary understanding of the development of Linux device drivers. Next I will make a summary of the establishment of the development environment for Linux device drivers to facilitate future queries, it also helps beginners of the same path. When users are new to Linux drivers, they often don't know how to compile the
will be handed over to the line discipline for processing. Line discipline is the meaning of the line procedure. Like its name, it indicates the input and output specification settings of the "Thread" of the terminal. It is mainly used for preprocessing of input/output data. After processing. The data will be handed over to tty_drivertty_driver, which is the driver corresponding to the terminal. It convert
After two weeks of exploration, I finally had a preliminary understanding of the development of Linux device drivers. Next I will make a summary of the establishment of the development environment for Linux device drivers to facilitate future queries, it also helps beginners of the same path. When users are new to Linux drivers, they often don't know how to compile the
_iowr (Type, nr, datatype) For bidirectional transmission _ioc_dir (NR) _ioc_type (NR); _IOC_NR (NR) _ioc_size (NR); return value The implementation of the IOCTL is usually a switch statement based on the command number Can't match any legitimate actions? Some kernel functions will return-einval The POSIX standard specifies that
list header field: Transfer_list, through the two linked header fields, All transfer that belong to this message transmission will be hung under the Spi_message.transfers field. We can add a spi_transfer structure to the SPI_MESSAGE structure using the following API:Static inline Voidspi_message_add_tail (struct spi_transfer *t, struct spi_message *m) { List_add_tail (t-> Transfer_list, m->transfers);}The universal interface layer invokes the controller-driven Transfer_one_message callba
I recently learned the operating mechanism of the device model and trained on books and online materials. my appearance amp; 20284; has changed my network permission. I recently learned the operating mechanism of the device model and trained books and online materials. it seems that I have modified my network weight. so I wrote down and sorted out my ideas. Since the hardware information and logical operat
After uboot completes the system boot and copies the Linux kernel to the memory, bootm-> do_bootm_linux () jumps to the start position of the kernel;The compressed kernel entry is in arch/ARM/boot/compressed/head. s, which decompress the call function decompress_kernel () and print "Uncompressing Linux... ", call gunzip () to print" done, booting the kernel."Then call_kernel, run the extracted kernel, and run Linux/ARCH/ARM/kernel/head. s calls start_kernel to transfer the General C code unrelat
(). 3.2 Touch Screen 1 orange part for the system initialization after the platform_device structure of data, mainly for the chip on the PIN application Gpio, the circuit diagram as shown below, 2 The blue part is through the input subsystem registered touch screen device driver, that is, the application input, set input related bit, register input equipment. This mainly sets the touch screen pressure p
= Musbmanager.opendevice (MUsbDevice);if (musbdeviceconnection! =NULL) {Toast.maketext (Mcontext,"Device Connected", Toast.length_short). Show (); Musbdeviceconnection.claiminterface (Usbinterface,true); New Thread (new Runnable () { @Override public void Run () { byte[] bytes = Printdata.getbytes (); int b = Musbdeviceconnection.bulktransfer (EP, Bytes, Bytes.length, 100000); LOG.I ("Return Status", "b-->
1 Linux Device models The Linux 2.5 kernel introduces a new device model designed to manage all devices on the computer in a unified way. It contains the following infrastructure: Type Description Equipment devices The device is the most basic type in this model and is organized hierarchically by the connection of the
/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Topic: asynchronous I/O * date:2014-11-11 */The most commonly used input/output (I/O) model in Linux is synchronous I/O. In this model, when the requ
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