The control of display device is the foundation to realize good human-machine interface. Analog TFT LCD screen meets the requirements of the industrial machine in cheaper price and good display characteristics,so it is widely used in industrial machines. For 17. 8 cm (7 in) analog screen, this paper puts forward the scheme that consists of STM32 and CPLD to achieve LCD control system based on single piece of SRAM as video memory, and analyzed the feasibility of the proposed scheme. The key problem of system design was discussed and parts of the program is given. The scheme saves cost and increases the reaction speed of the man-machine interface. It is of certain practical value.%对显示器件的控制是实现良好人机界面的基础,TFT模拟LCD屏符合普通机器对显示效果的要求且价格便宜,在工业机械中应用非常广泛.针对17.8 cm(7 in)模拟屏,提出STM32+CPLD实现单片SRAM做显存的LCD控制方案,并从STM32的DMA写外接显存的速度方面分析了所提方案的可行性.对系统设计中关键问题予以论述并给出了部分程序.方案节省了成本,提高了人机界面的反应速度,有一定实用价值.
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