lcd.c

基于STC89C58RD+液晶多级菜单源代码

#include<reg51.h>

sbit SLCD_CS   =  P2^5;
sbit SLCD_STD  =  P2^4;
sbit SLCD_SCLK =  P2^3;
#define SLCD_WIDTH 15
#define SLCD_NextLine SLCDSendCmd(0x00,0x90) //换行

void SLCDSendCmd(unsigned char cmd,unsigned char param);
void SLCDInit(unsigned char mode);
void SLCDCls(void);
void SLCDSendChar(unsigned char);
void SLCDSendString(const unsigned char*);
void SLCDSendNum(unsigned char num);

void SLCDSendByte(unsigned char dat)
{
unsigned char i=0;
unsigned char a=0;
SLCD_CS=1;
for(;i<8;i++)
{
  if(dat&0x80)
   SLCD_STD=1;
  else SLCD_STD=0;
  SLCD_SCLK=1;
  SLCD_SCLK=0;
  dat<<=1;
  for(a=0;a<10;a++);
}
SLCD_CS=0;
}

void SLCDSendString(unsigned char* s)
{
unsigned char i=0;
while(s[i])
{
if(s[i]=='\n') SLCD_NextLine;
else SLCDSendCmd(0x02,s[i]);
i++;
if(i%15==0)SLCD_NextLine;
};
}

void SLCDSendChar(unsigned char ch)
{
if(ch=='\n')  SLCD_NextLine;
else SLCDSendCmd(0x02,ch);
}

void SLCDSendNum(unsigned char num)
{
 unsigned char a,b,c;
 a=num/100;
 b=(num%100)/10;
 c=num%10;
 if(a!=0)SLCDSendCmd(0x02,a+'0');
 if(b!=0||a!=0)SLCDSendCmd(0x02,b+'0');
 SLCDSendCmd(0x02,c+'0');
}

void SLCDSendCmd(unsigned char cmd,unsigned char param)
{
  unsigned char a;
  a=cmd;
  cmd&=0x02;
  a&=0x01;
  a<<=2;
  cmd|=a;
  cmd|=0xf8;
  SLCDSendByte(cmd);

  a=param;
  a&=0xf0;
  param<<=4;
  param&=0xf0;
  SLCDSendByte(a);
  SLCDSendByte(param);
  SLCD_CS=0;
}

void SLCDCls(void)
{
  SLCDSendCmd(0x00,0x01);
}

void SLCDInit(unsigned char mode)
{
   SLCDSendCmd(0x00,0x30);
   SLCDSendCmd(0x00,0x01);
   SLCDSendCmd(0x00,0x06);
   SLCDSendCmd(0x00,0x0c);
   if(mode==0)
   {
   SLCDSendCmd(0x00,0x30);
   SLCDSendCmd(0x00,0x80);
   }
}