#ifndef _CRC_H_ #define _CRC_H static const unsigned char aucCRCHi[] = { 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, 0x01, 0xC0, 0x80, 0x41, 0x01, 0xC0, 0x80, 0x41, 0x00, 0xC1, 0x81, 0x40, 0x00, 0xC1, 0x81, 0x40, … Read more
01Introduction: Let’s start with the correct code. We will use a six-byte array for testing: [0x0a, 0x03, 0x02, 0x00, 0x00, 0x16]. 02Function and Results 1. Function // Example with 0a 03 02 00 00 16 var buffer = [0x0a, 0x03, 0x02, 0x00, 0x00,0x16]; // Call the function to calculate the CRC checksum var crc = … Read more
1. ECC MIPI CSI-2 uses a 24-bit ECC scheme. Inputting 24bit data, ECC encoding is performed to obtain an 8bit ECC result. Note: The 7th and 6th bits of the ECC byte must be 0. Data mapping relationship: Data identifier in the packet header DI[7:0] → corresponds to ECC input D[7:0] Low byte of word … Read more
1. Protocol Reverse Engineering Record (Wireshark Capture Code) # Wireshark filter rule (key fields marked in red)tcp.port == 102 && cotp && s7comm /* Typical handshake message structure 0000 03 00 00 16 11 e0 [TSAP:0x0100] [TSAP:0x0101] 00 00 00 01 00 c0 01 0a |_________| |___| |_____________| |_____________| |_TPKT_| |_COTP_| |S7C| */ #pragma pack(1) … Read more
Click the “Technical Training” above and select “Pin to Public Account” Over 150,000 industrial control professionals follow this WeChat platform: technical sharing, learning exchanges, industrial control videos The day before yesterday, I discovered a true fan who comments every day on the articles shared by Technical Training. He suggested that I share some content on … Read more
The Modbus RTU communication protocol uses a master-slave response method for data communication. Requests can only be initiated by the master (PC, HMI, etc.) through a unique slave address, and the slave (terminal device) responds to the master’s requests, thus enabling half-duplex communication. This protocol only allows the master to initiate requests, and the slave … Read more
EMMC Socket Usage: Enter “EMMC” under “Input Chip Marking” to see the following three options: EMMC_AUTO: Speed 8BIT (default), automatically recognized when EMMC. EMMC_AUTO_4BIT: 4BIT, recommended for most chips for stability. EMMC_AUTO_1BIT: 1BIT, can be selected when the above two cannot read; slower speed but may recover data in the chip. Additionally, the chip model … Read more
ModBus network is an industrial communication system formed by connecting programmable controllers with intelligent terminals and computers through public or local dedicated lines. Its system structure includes both hardware and software. It can be applied to various data acquisition and process monitoring. The ModBus network has only one master, and all communication is initiated by … Read more
Follow the “Automation Control System Communication” public account to understand the principles of automation control systems and master the knowledge of automation control systems. Click the blue “Automation Control System Communication” above to follow us. Understanding what the Modbus communication protocol is allows you to perform communication tests on-site using various third-party software. The Modbus … Read more
Someone is using the STM32G4 internal SPI configured as a slave full-duplex mode, using DMA for receiving. When the DMA is configured to CIRCULAR mode, problems occur where data transmission results in CRC verification failures and reception anomalies. If the DMA transfer mode is configured to NORMAL, there are no issues, and the received data … Read more