为了实现对TFT-LCD的控制,本文以STM32和CPLD作为核心控制器,SRAM作为显示缓存,介绍了一种TFT-LCD控制器设计方法。首先,对设计总体架构进行了分析,STM32内部实现了 Intel8080总线协议的制定,CPLD 内部实现了通讯协议的解析、LCD显示时序的驱动、以及 SRAM的读写控制。最后,对 LCD显示时序和SRAM的读写进行了仿直,并给出了实现效果图。结果表明,该设计方法能够控制TFT-LCD准确地显示出图文。结构简单,性价比高,具有较高应用价值。
In order to control the TFT-LCD,a design method of TFT-LCD controller is introduced, with the STM32 and the CPLD as the core controller,along with an external SRAM as the display cache.Firstly,the overall architecture of the design is analyzed.The communication protocol between STM32 and CPLD is drawn up inside of STM32.The drive of LCD timing,the parsing of communica-tion protocol and the reading and writing of the SRAM are implemented by the CPLD.At last,the LCD timing and the reading and writing of the SRAM are simulated,and the figure of the actual oper-ation effects are shown.The results indicate that the TFT-LCD can show the picture and word cor-rectly controlled by the proposed design method.The method is of simple structure,high cost per-formance and higher application value.
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