4/8/2023 0 Comments C serial port exampleThe implementation is slightly different between SBL2e-based products and our larger NetBurner platforms such as the SB800 EX (for more detail visit this product comparison table). This can be accomplished with a callback function. You could modify the NetBurner serial port driver code, but a preferred and perhaps lower risk method would be to keep the application-specific code in your project. The timer will be reset for each character, and only timeout if the proper gap occurs. Each time a character is received, a serial interrupt occurs and is processed in the serial interrupt service routine. Therefore, the key factor is low-latency received character processing to reset or update the timer. The focus of this article will be on the serial interrupt handling.įor this application example to work, a rapid timer reset is essential. NetBurner modules offer a number of timers that can be used for this purpose. Your application can then process the message. When the timer count reaches zero, it generates an interrupt and you know the message frame receipt is complete. One solution for applications that require precision timing on the serial stream is to use a callback function with a decrementing timer that resets to a known timing value each time a character is received. In applications that require precision serial data timing, this inter-frame delay can cause issues and can be mitigated with additional processing on the receiving end. t3.5 or 3.5 char) between successive bytes in the message stream. For example, the end of a MODBUS-RTU ( MODBUS Remote Terminal Unit) response message is defined as a silent interval or inter-frame delay of at least 3.5 character times (aka. However, there are situations in which you may want to process received serial data in your application. NetBurner serial device platforms are pre-loaded with a buffered interrupt-driven serial port driver, and for most use cases, that is all you need to handle serial communications – straight out of the box. In this article, we’ll show you an implementation of callback functions to handle these scenarios. In a majority of cases, NetBurner’s serial device platforms are ready for your Serial-to-Ethernet applications right out-of-the-box however, in applications that require precision serial data timing, additional processing may be needed. Handling serial data streams is our bread and butter.
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