beagle spi

SPI interface SPI interface IntroductionSPI is a synchronous serial transmission specification released by Motorola. It is often used as a serial expansion interface for MCU peripheral chip. SPI has four pins: SS (from device Selection Line), SDO (serial data output line), SDI (serial data input line), and sck (synchronous serial clock line ).

Beagle is a Linux Desktop Search software. It is similar to Google Desktop Search under winows. It can search for files in various formats. However, it is only a test version and many functions are not complete yet, however, it is basically ready for use. The principle of the software is similar to that of a common search engine. First, you need to start the Beagle deamon process for file indexing, if the l

The main file of the console driver framework is c/src/lib/libbsp/shared/console.c, and the driver's entry is console_initialize() The primary function is to initialize the global variables provided by the BSP Console_configuration_ports[Console_configuration_count], initializes the Termios schema, registers the file node of the Console device.C/SRC/LIB/LIBBSP/ARM/BEAGLE/CONSOLE/CONSOLE-CONFIG.C is the only file provided by the

;clock_driver_timecounter_tick (), however, Now call the updated version of Rtems_timecounter_tick (), the more modern clock driver needs a precise clock, each tick interrupt, to read this precise clock, so that can improve the accuracy of the timing.The Clock_driver_support_shutdown_hardware () called in the Clock_exit () function is also a function that the BSP can provide to stop the clock from running.BeagleLook at the Beagle BSP code, in the c/sr

Arm IRQ entry in Cpukit/score/arm/arm_exec_interrupt. S, where BSP most concern is the BL bsp_interrupt_dispatch This sentence, see Beagle BSP implementation, c/src/lib/libbsp/arm/beagle/ IRQ.C, the implementation is very simple, find out which interrupt source (vector number) caused by the interrupt, and then call Bsp_interrupt_handler_dispatch can, after the last interrupt processing, notify the interrupt

Using the "Beagle" arrangement, if the team is even in the number of teams in half (the team to the singular, the last to "0" to form an even number), the first half from the beginning of 1th, written down on the left, the last half of the number from the bottom to the right, and then use the horizontal line to connect the relative numbers. This is the first round of the game. The second round moves the number in the top right corner of the first roun

RTC-driven framework in C/SRC/LIB/LIBBSP/SHARED/TOD.C, most of the functionality has been implemented, the entry function is Rtc_initialize (), BSP to achieve very few things.Beagle implementation in C/SRC/LIB/LIBBSP/ARM/BEAGLE/RTC.C, provides a rtc_tbl rtc_table[] array, the size of the array is stored in the Rtc_count global variable, each RTC_ The table element is a possible RTC chip, and Rtc_initialize () invokes the probe function of each rtc_tab

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 provide a series of standard interface APIs, but also for these interface API defines the corr

IICVsSPIToday, in low-end digital communications applications, we are seen in IIC (inter-integrated circuit) and SPI (Serial peripheral Interface). The reason is that these two communication protocols are ideal for near- low-speed inter-chip communication. Philips (for IIC) and Motorola (for SPI) have developed both standard communication protocols for different backgrounds and market requirements.IIC was d

Through the first article, we already know that the whole SPI drive architecture can be divided into three parts: Protocol driver, general interface layer and controller driver. The controller driver is responsible for the data sending and receiving work at the lowest level, in order to complete the data sending and receiving work, the controller driver needs to complete the following functions:1. Request the necessary hardware resources, such as inte

SPI, is the abbreviation of English serial Peripheral interface, as the name implies is the serial peripheral device interface. SPI, is a high-speed, full-duplex, synchronous communication bus, and on the chip's pin only occupies four lines, saving the chip pin, while the layout of the PCB space saving, convenient, it is for this simple and easy to use features, now more and more chips integrated this commu

MCU simulation SPI interface-deep understanding of SPI bus protocol SPI (serial peripheral interfacer serial peripheral interface) is a synchronous serial communication interface launched by Motorola, the serial connection between the microprocessor compaction controller and the peripheral extended chip has developed into an industrial standard. Currently, variou

Through the first article, we already know that the whole SPI drive architecture can be divided into three parts: Protocol driver, common interface layer and controller driver. Among them, the controller driver is responsible for the lowest data receiving and dispatching work, in order to complete the data receiving and dispatching, the controller driver needs to complete the following functions: 1. Apply for the necessary hardware resources, such as

We know that SPI data transfer can be in two ways: synchronous and asynchronous. The so-called synchronization means that the initiator of the data transmission must wait for the end of this transmission, can not do other things, in code to explain that, after the transfer function is called, until the data transfer completes, the function will return. The asynchronous approach is the opposite, the initiator of the data transmission without waiting fo

SPI communication details, spi communicationSPI data transmission and receiving Mechanism1 SPI OverviewSPI is a ring bus structure that operates in the master-slave mode. This mode usually has one master device and one or more slave devices and requires at least four lines (during Unidirectional transmission, the three lines can also be used), which is composed o

We know that SPI data transfer can be in two ways: synchronous and asynchronous. The so-called synchronization means that the originator of the data transfer must wait for the end of the transmission, the period can not do other things, in code to explain that the function is called after the transfer, until the data transfer is complete, the function will return. And the asynchronous way is just the opposite, the initiator of data transmission does n

#include "iospiflash.h"/*******************************************//This was a IOSPI (Simulater by IO)//Lib for Driver Flash W25Q64BV//*******************************************/Sbit ioflashspi_cs= p1^0;Sbit Ioflashspi_din = p1^3;Sbit ioflashspi_dout = p1^4;Sbit ioflashspi_clk = p1^5;/*******************************************//IOSPI Base FUNCData shifting at the--rising edge--of the CLKCLK need a Hold Time Mydelay (3)//ShiftWrite U8Read U8//1Time Series requires:The w25q64b Flash support the

Linux Device Driver inquiry 1st days ---- spi Driver (1), 1st days ---- spi This document allows reprinting. Please indicate the source:Http://blog.csdn.net/fulinus The Linux kernel code is too big, and a small module will make you feel helpless. This afternoon, I am determined to take a good look at the spi driver. First, analyze the spidev. c file, which define

Spring transaction SPI and configuration introduction, spring transaction spi Abstract of Spring transaction management. Three core interfaces are PlatformTransactionManager, TransactionDefinition, and TransactionStatus. Shows the link: TransactionDefinition:Defines Spring-compatible transaction attributes, including transaction isolation level, transaction Propagation Behavior, timeout duration, and read

From: http://www.cnblogs.com/liugf05/archive/2012/12/03/2800457.html There are two major modules below: One is SPI bus-driven analysis (the specific implementation process is studied) The other is the writing of the SPI bus driver (no need to study the specific implementation process) SPI bus driver analysis 1 SPI Ove