LCD 8位模式到4位模式 [英] LCD 8-bit mode to 4-bit mode

问题描述

我们有一个字符LCD(www.cloverlcd.com/pdf/S6A0069.pdf)，我们必须在8位模式下工作.但是，现在我们试图使其在4位模式下工作，但似乎什么也没显示.我认为尚未编写功能集指令.有人可以检查我是否以正确的方式处理吗?我将发布我的8位代码(正在工作)和我的4位代码(我正在尝试开始工作)

We have a character LCD (www.cloverlcd.com/pdf/S6A0069.pdf) that we got to work in 8 bit mode. However, now we are trying to get it to work in 4 bit mode but it doesn't seem to be displaying anything. I think the function set instruction isn't been written. Can somebody please check if I am approaching this the right way? I'll post my 8 bit code (which is working) and my 4 bit code (which I'm trying to get to work)

     //8 bit working
    COMPortC(0x3C);     //function set                                          
    Delay1KTCYx(10);
    COMPortC(0x0F);     //Turn on display and configure cursor settings         
    Delay1KTCYx(10);
    COMPortC(0x01);     //clear display
    Delay1KTCYx(10);
    COMPortC(0x06);     //increment mode and increment direction (entry mode set)
    Delay1KTCYx(10);
    COMPortC(0x02);     //Return Home

       //4 bit
    COMPortC(0x20);     //function set                                          
    Delay1KTCYx(10);
    COMPortC(0x20);     //function set                                          
    Delay1KTCYx(10);
    COMPortC(0x80);     //function set                                          
    Delay1KTCYx(10);

    COMPortC(0x00);     //Turn on display and configure cursor settings         
    Delay1KTCYx(10);
    COMPortC(0xF0);     //Turn on display and configure cursor settings         
    Delay1KTCYx(10);

推荐答案

我不确定您的4位是如何连接的，但是我的猜测是....因为您是在高半字节(0x)上发送位* 0-星星所在的位置)，您可能希望使用较低或最低有效半字节，即0x0 *.

I'm not sure how your 4 bits are hooked up, but my guess is.... Since you are sending the bits on the upper nibble (0x*0 - where the star is), that you likely want to use the lower or least significant nibble which would be 0x0*.

COMPortCWithoutBusy(0x02);      //function set first nibble                                     
Delay1KTCYx(10);
COMPortCWithoutBusy(0x02);      //function set second nibble                                    
Delay1KTCYx(10);
BusyEnable();
Delay1KTCYx(10);
...

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