I/O signal reference method

Abstract

The invention provides a reference method of an I / O signal. The reference method comprises the following steps: S1, an identifier of a referenceable I / O signal is defined; s2, the application module locally creates a variable object corresponding to the identifier of the reference I / O signal by referring to the identifier of the I / O signal, and adds the variable object into a mapping table in which the identifier of the I / O signal is in one-to-one correspondence with the variable object; s3, an access mapping relationship is established between the variable object and the I / O signal through aninternal communication mechanism according to the mapping table; s4, the application module controls and accesses the I / O signal by reading and writing the variable object. In the method, the external I / O signals are controlled and accessed by operating the local variable object when the application module runs, program architecture is decoupled in a layered mode, and the method has the advantages that I / O access is flexible and efficient, and dynamic loading running of the application module is supported.

Description

technical field [0001] The invention belongs to the technical field of embedded devices, and in particular relates to a method for quoting I / O signals. Background technique [0002] The embedded universal control platform is usually composed of CPU board, communication board, input and output interface board, etc. The input and output interface board usually includes switch input board, switch output board, analog input board and analog output board. In order for the boards to work together, the boards need to interact with input and output signals (referred to as I / O signals). The conventional method is to design a dedicated inter-board communication protocol to complete the specified signal interaction. With this method, as long as the upper-layer application module (APP) access I / O requirements change, the communication protocol will be modified, and the adaptability is poor; or The configuration information including inter-board interaction signals is generated in advan...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a reference method for I / O signals, which supports flexible and efficient access to I / O signals when application modules are running; supports I / O access when application modules are dynamically loaded and running, thereby solving the problem of inter-board communication The problem of not being flexible and efficient enough

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