From the following address: http://www.byteparadigm.com/applications/introduction-to-i2c-and-spi-protocols/I²c vs SPIToday, at the low end of the communication protocols, we find i²c (for ' inter-integrated Circuit ', Protocol) and SPI (for ' Serial peripheral Interface '). Both protocols is well-suited for communications between integrated circuits, for slow communication with on-board PERIPH Erals. At the
Now that we know the protocol, we can start to look at the SPI driver code in Linux kenerl. There are many struct in the code, so let's take a look at the main struct first, in this way, we can better understand the driver. Mainly include/Linux/SPI. h
The first is the communication interface between the SPI host and the slave, that is, the
The last 2 weeks have been debugging IIC and SPI bus equipment, here record 2 kinds of bus, in case of forgetting.
One IIC Bus
The abbreviation of I2c--inter-ic serial Bus is the serial transmission bus between chips introduced by Philips company. It implements duplex synchronous data transfer with 1 serial data cables (SDA) and 1 serial clock lines (SCL). The utility model has the advantages of less interface line, simpler control mode, smaller devic
Linux Kernel SPI subsystem architecture analysis (clear)
There are two types of equipment on the SPI bus: one is the main control end, which is usually used as a sub-module of the SoC system. For example, many embedded mpus usually contain SPI modules. One is the controlled end, such as flash and sensors of some SPI in
SPI is "Serial peripheral Interface" abbreviation, is a four-wire synchronous serial communication interface, used to connect microcontrollers, sensors, storage devices, SPI device sub-primary device and two from the device, for communication and control of the four lines are:
CS Chip Selection Signal
SCK Clock Signal
Miso the data input from the main device, the data output pin from the de
SPI is the abbreviation of English Serial peripheral interface, as the name implies is the serial peripheral device interface. Motorola was first defined on its MC68HCXX series processors. SPI interface is mainly used in EEPROM, FLASH, real-time clock, AD converter, as well as digital signal processor and digital signal decoder.
SPI, is a high-speed, full-duplex,
Differences:
SPI: high-speed synchronous serial port. 3 ~ 4-line interface, independent and synchronous sending and receiving
UART: Universal asynchronous serial port. Bidirectional communication based on the standard baud rate is slow
I2C: A three-line serial transmission mode. The communication protocol and usage can be found on the Internet.
Bidirectional data transmission with three linesSerial peripheral interfaceUART: Universal asynchronous tra
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The relationship between spi_master/spi_device and spi_driver.
Important data structures:
~~~~~~~~~~The topic of the SPI controller is spi_master. Although you do not need to write your own
What is SPI
The SPI is the service Provider Interface, which provides the interface.
SPI thought
Abstract in our system of the various modules, often have a lot of different implementations, such as the program of the log module, XML parsing module, the JDBC module scheme. In the object-oriented design, we generally recommend that the modules are base
Purpose of study: (1) familiar with SPI interface and its read-write timing;(2) Review the $READMEMB command and $display command in the Verilog simulation statement;(3) Mastering the SPI Interface write sequential operation of the hardware language description process (in this case only write timing for example), for the later description of more complex sequential logic circuit lay the foundation.Learning
MSM8909 + Android5.1.1 SPI driver development (PSAM part)
MSM8909 + Android5.1.1SPI driver development (PSAM part)
1. PSAM Hardware Design
Figure 1
CS chip selection Signal
SCK clock signal
Data input from the MISO master device and output from the device
Data output from the MOSI master device and input from the device
2. PSAM Software Design
Figure 2
(1) PSAM Application
You only need to call the API function.
(2) PSAM API
The main task of t
SPI is a "serial peripheral Interface" abbreviation, is a four-wire synchronous serial communication interface, used to connect microcontrollers, sensors, storage devices, SPI equipment divided into the main equipment and two from the device, the four lines for communication and control are:
The CS chip chooses the signal SCK the clock signal MISO The main equipment The data input, from the device's data ou
SPI is a "serial peripheral Interface" abbreviation, is a four-wire synchronous serial communication interface, used to connect microcontrollers, sensors, storage devices, SPI equipment divided into the main equipment and two from the device, the four lines for communication and control are:
The CS chip chooses the signal SCK the clock signal MISO The main equipment The data input, from the device's data ou
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Introduction
In this section, let's talk about the usage of the SPI bus in the nioshi II. First of all, let's briefly introduce the SPI bus. SPI is short for serial peripheral int
The ad7708 is a 16-bit Σ-△type adconverter chip. in low-frequency applications, the ad7708 can be used as the complete front end of a single power supply. The ad7708 contains a PGA (Programmable Gain Amplifier) to enlarge the signal. The PGA range is 20-28, which is programmable, when the reference voltage is V, the voltage from 20mv to 2.56v can be measured. The ad7708 and ad7718 pin functions exactly the same, but the number of digits ad7718 is 24 bits. If you use 7718, you only need to change
SPI (Serial peripheral Interface), serial Peripheral interface. SPI is a high-speed, full-duplex, synchronous communication bus.The SPI interface typically uses 4 lines of communication:Miso Master device data input, from device data outputMOSI Master device data output, from device data inputSCLK clock signal, with main device generatedCS from the device chip se
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Classification: embedded multi-media
1. SPI protocol Overview
SPI, short for serial peripheral interface, is a serial peripheral interface. Motorola first defined it on its mc68hcxx series processor. The SPI interface is mainly
1. SPI Bus structureSPI Serial Peripheral Interface, is a high-speed, full-duplex, synchronous communication bus. Adopt master-Slave mode architecture, support multiple slave, generally only support single masterThere are 4 signal lines in the SPI interface, namely:Device Selection Line (SS), clock Line (SCK), serial output data cable (MOSI), serial input data cable (miso).2. Data transfer processThe master
Principles, differences and Applications of SPI, I2C, and UART Serial Bus
1. UART is a two-line interface. One transmission and one receiving interface can communicate with each other in full duplex mode, and the number of lines is relatively small. Data is transmitted asynchronously, with strict timing requirements on both parties, and the communication speed is not fast. It is used most frequently for multi-host communication.2. Compared
1: Configure PIN for SPI function
At the end of the board-mx6q_sabresd.h, the copy is redefined
(To add SPI2 as an example)
[CPP]View Plaincopy
"FONT-SIZE:18PX;" > MX6Q_PAD_EIM_CS0__ECSPI2_SCLK,
Mx6q_pad_eim_cs1__ecspi2_mosi,
Mx6q_pad_eim_oe__ecspi2_miso,
MX6Q_PAD_CSI0_DAT11__ECSPI2_SS0,
After that, the board-level file BOARD-MX6Q_SABRESD.C will have related functions for the unified initialization
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