ST7920LCD求救

只看该作者 · 2008-4-24 15:24

现在正在对一块ST7920的LCD进行编程，可是程序烧写后，无论如何，LCD都没有反应，只有背光，下面是与LCD相关的程序，请各位高人帮忙指点迷津，谢谢。

#define StartLCMData        PORTA |= 0X10
#define StopLCMData        PORTA &= 0XEF
#define LCMParaMode        PORTF |= 0X20
#define LCMInstruction    PORTF &= 0XF7
#define LCMData        PORTF |= 0X08
#define LCMWrite        PORTF &= 0XEF
#define LCMRead        PORTF |= 0X10
#define StartResetLCM        PORTF &= 0XBF
#define StopResetLCM        PORTF |= 0X40

void InitializeLCM(void)
{
    unsigned int i = 0;

    StartResetLCM;
    for(i=0;i<=400;i++)
    {
        Delay();
    }
    StopResetLCM;
    Delay();

    DisableLatch;

    LCMParaMode;
    LCMWriteCommand(0X30);      //功能设定
    LCMWriteCommand(0X30);      //根据ST7920手册,再次功能设定
    LCMWriteCommand(0X02);      //位址归位
    LCMWriteCommand(0X0C);      //显示状态设定
    LCMWriteCommand(0X01);      //清屏
    LCMWriteCommand(0X06);      //进入点设定
    LCMWriteCommand(0X80);      //设定DDRAM地址

    return;
}

void LCMWriteCommand(unsigned char command)
{
    unsigned int i;

    LCMInstruction;
    LCMWrite;
    StartLCMData;
    PORTB = command;

    Delay();

    if((0x01 == portb)&&(0x00 == portg))
    {
        for(i=0;i<=20;i++)
        {
            Delay();
        }
    }

    StopLCMData;
    return;
}

void LCMWriteData(unsigned char data)
{
    LCMData;
    LCMWrite;

    PORTB = data;
    StartLCMData;
    Delay();
    StopLCMData;
    return;
}

void main（）
{
     InitializeLCM();
     LCMWriteData(0x41);            //显示"A"
     while(1)
     {;}
}

只看该作者 · 2008-4-24 15:25

DELAY函数大约可以延时200us

ST7920LCD求救

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DELAY函数大约可以延时200us