摘要
利用ARM处理器SPI和DMA的工作特点,设计辅助电路对两组RAM进行逻辑控制,使得修改超长LED显示屏数据时不影响显示效果。控制系统设计2组串行RAM,通过控制2组串行RAM的逻辑和时序,可以实现同步刷新、异步修改和DMA方式高速输出等多种功能。在显示输出时采用SPI接口的DMA输出方式,实现了超长LED显示屏的控制。同时,阐述了该控制系统的设计理念、电路原理图及编程方法,并给出实测实验结果。实验结果表明,此设计具有很高的实用价值。
An auxiliary circuit are designed to control two sets of RAMs logically according to the operation characteristics of ARM processor SPI and DMA to make the data modification of super-long LED display screen does not impact the display ef-fect. Two sets of serial RAMs are designed for control system. Several functions such as synchronous refreshment,asynchronous modification and high speed output in DMA mode can be achieved through logic and time-sequence control of two serial RAMs. The control of super-long LED display screen is achieved by adopting DMA output mode of SPI interface in the display output. In this article,the design philosophy of control system is described,and the circuit schematic diagram,programming method and experimental results are provided.
出处
《现代电子技术》
北大核心
2015年第14期48-51,共4页
Modern Electronics Technique
基金
教育部春晖计划科研合作项目(22014044)
