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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)
{;}
}
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