In the Industrial Internet of Things (IIoT) domain, serial communication is a highly prevalent and crucial means of data transmission. For many traditional industries, understanding and mastering the methods of receiving serial data is an essential foundation for achieving device interconnection and data interoperability. This article will provide a detailed explanation on how to receive data via serial communication.
Serial communication, also known as Serial Communication Interface (SCI), is a communication method that transmits data bit by bit in a sequential order. In serial communication, data is transmitted sequentially, one bit at a time, with each bit occupying a fixed duration. This communication method is commonly used for data exchange between computers and external devices.
Initialization of Serial Port: Before starting to receive data, the serial port needs to be initialized, including setting parameters such as baud rate, data bits, stop bits, and parity. These parameters must be consistent with the sender to ensure correct data transmission.
Opening the Serial Port: After initialization, the serial port needs to be opened, putting it in a listening state to wait for incoming data.
Data Reception: When the serial port receives data, an interrupt signal is triggered. In the interrupt handling function, we need to write corresponding code to read the received data. Typically, these data are stored in a buffer for subsequent processing.
Data Processing: After receiving the data, we need to parse and process it. This includes checking data integrity, parsing data format, and extracting useful information. Depending on the specific application scenario, further processing of the data, such as filtering or conversion, may be required.
Closing the Serial Port: When there is no longer a need to receive data, the serial port needs to be closed to release related resources.
Selecting Appropriate Serial Parameters: Based on the actual application scenario and the sender's requirements, selecting appropriate serial parameters is crucial for ensuring correct data transmission. Different devices and protocols may use different serial parameters, so adjustments need to be made accordingly in practical applications.
Handling Interrupt Signals: In serial communication, interrupt signals are very important. When data is received, the interrupt signal is triggered, so we need to write corresponding interrupt handling functions to read and process the data. At the same time, to avoid interrupt conflicts and misjudgments, appropriate masking and handling of interrupt signals are required.
Data Verification and Error Handling: During data reception, issues such as data loss or errors may occur. Therefore, we need to perform data verification and error handling. Common verification methods include parity check and CRC check. For erroneous data, we need to handle it accordingly, such as retransmitting or discarding it.
Buffer Management: In serial communication, data is usually stored in a buffer. Therefore, we need to manage the buffer appropriately, including allocating memory, reading data, and releasing memory. At the same time, to avoid issues such as buffer overflow and data loss, we need to design the buffer size and read/write strategy reasonably.
Multithreading and Concurrent Processing: In some complex application scenarios, there may be a need to receive data from multiple serial ports simultaneously. In such cases, we can adopt multithreading or concurrent processing to improve system efficiency and response speed. At the same time, to avoid conflicts and data inconsistencies among threads, we need to perform synchronization and mutual exclusion handling of threads.
Receiving data via serial communication is an important technology in the field of Industrial Internet of Things. For traditional industries, understanding and mastering this technology will help improve the intelligence level of devices and data interoperability. I hope this article can be helpful to you!
