CAN (control area network) open slave station system based on DSP (digital signal processor) 28335

Abstract

The invention provides a CAN (control area network) open slave station system based on a DSP (digital signal processor) 28335. The CAN open slave station system is based on a DSP 28335 hardware platform, can be applicable to an embedded operating system or a state machine system constructed on a foreground-background system, comprises a CAN communication management module, an object dictionary management module, a network management module, a timer management module, a communication object management module and the like, and completes basic tasks of the CAN open such as PDO(process data objects), SDO(service data objects), NMT(network management objects), synchronous message processing and the like. By the aid of the CAN open slave station system based on the DSP28335, a 301 protocol function in a CIA protocol is completely achieved. The CAN open with targeted optimization can be transported from node functions to a CPU of the same series after simple modification on the DSP28335 platform, so that transportability is achieved. Codes can be reduced, system resource occupation is low and timeliness is high. Due to high applicability, various node functions can be achieved only with simple configuration, and the CAN open slave station system is low in development cost and convenient in maintenance and function expansion.

Description

technical field [0001] The invention belongs to the field bus technical field, in particular to a CANopen slave station system based on DSP28335. Background technique [0002] CANopen is a high-level application protocol based on the CAN-bus specification. It was jointly developed by manufacturers and users in conjunction with CiA, and became the CENELEC EN50325-4 standard in 2002. At the same time, CANopen is also a sub-protocol series, and its basic communication mechanism is described in the communication sub-protocol (Communication Profile). CANopen has established standards in a large number of industrial communication fields to realize industrial communication of distributed automation control equipment based on CAN-bus. Under each CANopen node, it not only allows broadcasting to transmit messages, but also sends and receives data in a point-to-point manner. The CANopen network management function simplifies project development. In addition, the user can implement an...

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Problems solved by technology

Since it takes a certain amount of time for the system data to be transmitted from the system CPU to the module and the internal processing of the module, the response speed of the node will be slowed down accordingly, and because the communication speed of the CAN bus reaches 1M / S, the general internal serial bus cannot reach the corresponding speed, resulting in a The speed bottleneck affects the information exchange rate of the entire CANopen network

Moreover, most functional modules have a single function and cannot be flexibly configured. Adding new functions can only rely on the corresponding manufacturers to develop new models, and the installation space needs to be considered separately in the product design. The high cost per unit is not conducive to the miniaturization and scale of the product.

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