How to realize communication between a MCU and a PC (what is the difference between a MCU and a PC)

Today, I will share with you the knowledge of how to realize communication between a MCU and a PC. It will also explain the difference between a MCU and a PC. If you can happen to solve the problems you are facing now, don't forget to pay attention to this site, let's start now!

List of contents for this article:

• 1、PC communicates with MCU through network port, design process!
• 2、c Programming: The PC sends a single character to the MCU. When the MCU receives a single data sent by the PC...
• 3、Serial communication between MCU and PC
• 4、Single-chip microcomputer wireless communication module How to realize wireless communication between single-chip microcomputer and computer
• 5、How does the upper computer communicate with the lower computer
• 6、How to realize SPI communication between MCU and PC?

PC communicates with MCU through network port, design process!

1. During the design processHow to realize communication between MCU and PC, first of all, you must clarify your communication needs, whether you require a complete network protocol stack or simple MAC layer communication. Then, select the right hardware and software solution based on your needs. If it's a complex network protocol stack, you need to go deep intoHow to realize communication between MCU and PCUnderstand the working principle of TCP/IP protocol and carry out corresponding software development. For simple MAC layer communication, you can directly use the functions provided by RTL8019 to reduce development workload.

2. Sending Ethernet data packets is actually relatively simple. You only need to connect the data lines, address lines, control lines, and interrupt pins correctly, and then use a microcontroller to access the external bus. But to communicate with a computer, you may also need to write or transplant your own IP layer, UDP or TCP protocol. Of course, you can also communicate raw MAC packets on your computer.

3. The computer should have a module driver that can be directly loaded. The small car should communicate directly with the module. I only know that there is a wireless transceiver circuit, which realizes communication between single-chip computers and single-chip computers. You can also use it if you want to use it on your computer. The computer is connected to one end of the transceiver through a serial port, and the other end is connected to the trolley microcontroller. Control the MCU to send and receive information from the MCU on the cart through the computer serial port. That is the method said by feather wheat field.

4. Communication method Serial communication: This is a relatively common method. The microcontroller communicates with the PC through a UART (Universal Asynchronous Transceiver) interface. Data is transmitted in sequence in units of characters and has a fixed format, including start bit, data bit, check bit and stop bit. For example, in some simple sensor data acquisition systems, a microcontroller sends the collected data to a PC through a serial port for processing and storage.

c Programming: The PC sends a single character to the MCU. When the MCU receives a single data sent by the PC...

1. This is the simplest program for serial communication between a MCU and a PC. The MCU receives a single character without judgment, and only sends the original character. You can use proteus to simulate and test, use a virtual terminal instead of a PC, use a computer keyboard to enter characters, and send them to the MCU by the virtual terminal. The MCU receives them and returns them according to the original characters, and the virtual terminal will display the received characters.

2. Serial communication between the MCU and the PC. The serial transceiver program of the MCU is very simple, and there are many on the Internet. After the serial port is initialized, set the baud rate and turn on the serial port interrupt, and you can wait to receive data from the PC. If the PC sends single byte data, it can be sent as it is after receiving it.

3. For example, you can write a function called TQ that is specifically used to convert characters to numbers. This function takes a character as input and checks its ASCII value to determine if it is between 0 and 9. If the character is in the range 0x30 to 0x39, the corresponding decimal digit is returned. If it is not within this range, 0 is returned. Next, you can define a function called HB to process the received character data.

4. When sending data from the PC, you can send one string at a time. The microcontroller can receive this string.\ 0 and\n are both special characters in the string. Whether or not to send depends on the application situation. Through the initialization of the serial communication module, the unified baud rate of the character frame formats of both parties is consistent. The last part is the interpretation of the SBUF and RI flags and the analysis of the protocol.

Serial communication between MCU and PC

Serial communication basics UART of MCS-51 microcontroller: The AT89C51 microcontroller has a built-in full-duplex serial communication port (UART) to communicate with the outside world through RXD (receive data) and TXD (send data) pins. There are two independent buffers (SBUFs) inside, which can send and receive data simultaneously.

For example, when communicating with a PC, data collected by the MCU can be uploaded to the PC for processing and analysis, and control instructions sent by the PC can also be received to control the operation of the MCU. Multi-computer communication: In some application scenarios, multiple 51 single-chip computers are required to work together.

This is the simplest program for serial communication between a MCU and a PC. The MCU receives a single character without judgment, and only sends the original character. You can use proteus to simulate and test, use a virtual terminal instead of a PC, use a computer keyboard to enter characters, and send them to the MCU by the virtual terminal. The MCU receives them and returns them according to the original characters, and the virtual terminal will display the received characters.

The master can send instructions to a specific slave machine, and the slave machine performs the corresponding operation after receiving the instructions and returns the result to the master. This has widespread applications in distributed control systems. For example, in smart home systems, multiple smart devices communicate with the main control microcontroller through serial ports to achieve centralized control and data sharing. Program download and debugging download program: The serial port can be used to download written program code from a PC to a 51 MCU.

Single-chip microcomputer wireless communication module How to realize wireless communication between single-chip microcomputer and computer

1. In terms of communication, communication is nothing more than realizing data exchange. At the beginning, we should use wired communication directly with 485, which is convenient to realize and convenient to write computer software. If you have to implement wireless communication.. I don't know if there is a module that can be directly connected to a computer to realize wireless transceiver. If there is one, it should be very convenient to implement it. The computer should have a module driver that can be loaded directly. The small car should communicate directly with the module.

2. Method 1: Use the MAX232 chip and the USB-to-serial port cable to connect the MCU and the MAX232 chip: Connect the RXD on the STC52 MCU to the TXD of the MAX232 chip. Connect the TXD on the STC52 microcontroller to the RXD on the MAX232 chip. Other pins of the MAX232 chip, such as power supply and ground, need to be correctly connected to the power supply and ground of the MCU board in accordance with the chip specifications.

3. There are mainly the following ways for a computer to control a single chip: Communication through serial ports such as RS232: Hardware requirements: Both the computer and the single chip must have an RS232 interface, or use a corresponding converter to connect. Software implementation: Write the underlying driver, define the communication protocol, and write the human-computer interactive interface. You can also use the serial debugging assistant to directly send commands to control the MCU.

4. To send data to the computer through the serial port to WiFi module, you can follow the following steps: Hardware connection: Ensure that the microcontroller is correctly connected to the serial port to WiFi module. This usually involves the docking of TX, RX, GND and other pins. If you are using a notebook: Make sure the notebook and WiFi module are connected to the same wireless router to create a local area network environment.

5. This method usually involves complex connections and communications between the MCU, WiFi modules, computers and TCP servers. For example, when using the STM32F103 microcontroller, the data of the microcontroller can be transmitted to the server through a WiFi module (such as ESP32), and the server then sends the data to the computer and draws it into an image to realize remote transmission and processing of the data.

6. Method: The MCU connects to the network through an Ethernet interface or WiFi module to communicate remotely with the PC. The PC communicates with the MCU through socket programming. Features: It is not limited by distance and can realize remote monitoring and control, but requires certain network knowledge and programming capabilities.

How does the upper computer communicate with the lower computer

The communication between the upper computer (such as PC) and the lower computer (such as AT89C51 microcontroller) is mainly realized through serial communication. The core is to use the UART (Universal Asynchronous Transceiver) of the microcontroller to exchange data with the RS-232 interface of the PC, and solve the problem of level incompatibility through a level conversion chip (such as MAX232).

USB connection: The upper computer is usually equipped with a USB interface, and some microcontrollers in the lower computer also support the USB interface. After both parties run the corresponding communication program, they can communicate efficiently through the USB interface. Serial port connection: Almost all single-chip computers have UART interfaces, which can be used to communicate with the upper computer.

There are two main connection methods between the upper computer and the lower computer: USB and serial port. An upper computer usually refers to a computer, while a lower computer refers to an electronic device containing a single chip microcomputer (MCU). Most modern computers are equipped with USB interfaces, and some microcontrollers also support USB interfaces, allowing efficient communication with computers. Of course, this kind of communication requires both parties to run corresponding communication programs. In addition to USB, serial port is also a common connection method.

In practical applications, the appropriate transmission rate can be selected based on specific needs and equipment performance. A higher transmission rate can improve data transmission efficiency, but it may require higher signal quality, and the transmission rate needs to be determined by comprehensively considering the stability and reliability of the system. There are 4 lines connecting the RS422 interface for signal connection, namely A, B, A-, and B-. Where A and B are data transmission lines, and A-and B-are signal ground wires.

How to realize SPI communication between MCU and PC?

When a master computer is connected to several different serial I/O chips via SPI, the allow control terminal of each chip must be used, which can be achieved through the MCU's I/O port output line. However, special attention should be paid to the input and output characteristics of these serial I/O chips: the first is whether the serial data output of the input chip has a three-state control terminal. When the chip is not selected in normal times, the output terminal should be in a high resistance state. If there is no three-state control terminal, a three-state gate should be added.

Regarding the car, you must first use a single chip microcomputer to control the car's forward, backward, acceleration, and deceleration. These are motor driving issues, depending on the specific motor you use for the car. It should be easier to implement. Speed detection and ambient temperature detection of the car depend on what sensor you plan to use to detect, and it is generally a digital signal. Collect it with a single chip microcomputer and then calculate it.

Communication method: Through the ICSP interface, a special debugger can be used to communicate with the PC, thereby realizing the programming and debugging of the MCU. These debuggers can be connected to a PC via an RS232 serial cable or a USB cable. To sum up, ICSP is an in-circuit serial programming protocol specially designed for PICmicro single-chip computers. It uses the SPI protocol for communication and connects to the debugger and PC through a specific 6pin interface.

Indicates that the communication process has ended. Pay attention to the setting of the SS pin: When set to slave mode, the SS pin should be set to the input. When pulled low, the SPI can only take effect. If pulled high, it will be a passive SPI mode; in master mode, the SS pin can be set, and generally it should be set to output, and if it is set to input, it should be kept high, otherwise normal master mode operation will not be possible.

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