基于DSP驱动的光电隔离型类SPI通道设计

Quasi-SPI Channel Design with Optical-Electrical Isolation Based on DSP

分析测控系统在串行通信过程中的特殊需求和存在问题,设计一种基于DSP驱动的光电隔离型类SPI通道。给出了通道实现的基本原理,并就通道在应用中存在的问题及解决方法进行分析,探讨了DSP驱动下的类SPI时序控制方法,给出通道实现通信功能的控制流程,最后以DSP和CS5460A组成的瞬时能量采集系统为例,说明提出的光电隔离型类SPI通道设计方案可行性。实验结果进一步表明系统的抗干扰性能和SPI时序控制的灵活性。

The project is intended to design a quasi-SPI channel with optical-electrical isolation based on DSP.Firstly,some problems and specific needs about SPI serial communication in the measurement and control system are analyzed and discussed.Then the principle of the channel implementation is presented,the existing problems and solutions in the application are analyzed,and quasi-SPI timing control method based on DSP is discussed.The control flow implemented communication function is given.Finally,through an example of the instantaneous energy acquisition system composed of DSP and CS5460 A,further illustrates advantages of antiinterference feasibility and sequential control convenient and practical of the design.