图形LCD不能读取

我正在使用一个图形LCD（8080接口）在我的项目中。在使用GrimeLCCDInf1V16在创建者中发现它难以与PSoC5进行接口之后，我设法通过使用GPIO中的GPIO引脚来连接它。我已经建立了我的四个控制引脚（NCS，NRD，NWR和AO）作为数字输出，并将它们物理连接到LCD。我已经设置了8个数据引脚作为数字输出/数字输入，并连接到LCD。我可以给LCD写完美的文字和绘制一些图形。对于需要阅读的例程，问题开始了。我看不懂液晶显示器！我怀疑我错过了我的PIN设置的东西。当我尝试将数据引脚设置为双向引脚时，我甚至无法写入LCD。当我把引脚设置为数字输入和数字输出时，我可以写入LCD，但不能从中读取。有想法的人请帮助。



     以下为原文
  I am using a graphics lcd (8080 interface) in my project. After finding it difficult to interface it with the psoc5 using the graphiclcdintf_v1_6 in creator I managed to inteface it by connecting it up using gpio pins in creator. I have set up my four control pins (nCS, nRD, nWR and AO) as digital outputs and connected them physically to the lcd. I have set up the 8 data pins as digital output/ digital inputs and connected to the lcd as well. I can write to the LCD perfectly - writing text and drawing some graphics. For routines that require reading, the problems begin. I cannot read the lcd memory! I suspect that I missed something in my pin setup. When i try setting up the data pins as bidirectional pins, I fail to even write to the lcd. When I set the pins as digital input and digital output I can write to the lcd but cannot read from it. Anyone with ideas- please help.