lcd9851.h

内附信号发生芯片9851（AD公司生产）的单片机程序

//#include <reg52.h>
#define x1    0x80
#define x2    0x88
#define y     0x80
#define comm  0
#define dat   1

sbit rs = P1^2;   //H=data; L=command;
sbit rw = P1^5;   //H=read; L=write;
sbit  e = P1^7;   //input enable;
//sbit psb= P0^3;   //H=并口; L,=串口;
//sbit rst= P0^4;   //Reset Signal 低电平有效

sbit busy=P0^7;   //lcd busy bit
void wr_lcd (unsigned char dat_comm,unsigned char content);
void chk_busy (void);
void delay2 (unsigned int us);

unsigned char  tab1[]={
"----当前频率----"
"                "
"    00000000 Hz "
"                "
};


/*------------------初始化-----------------*/
void init_lcd (void)
{
  //rst=1;
  //psb=1;
  wr_lcd (comm,0x30);  /*30---基本指令动作*/   
  wr_lcd (comm,0x01);  /*清屏，地址指针指向00H*/
  wr_lcd (comm,0x06);  /*光标的移动方向*/
  wr_lcd (comm,0x0c);  /*开显示，关游标*/
}
/*---------------显示汉字或字符----------------*/
void chn_disp (unsigned char  *chn)
{
  unsigned char i,j;
  wr_lcd (comm,0x30);
  wr_lcd (comm,0x80);
  for (j=0;j<4;j++)
  {
    for (i=0;i<16;i++)
    wr_lcd (dat,chn[j*16+i]);
   
  }
}

/*--------------清DDRAM------------------*/
void clrram (void)
{
  wr_lcd (comm,0x30);
  wr_lcd (comm,0x01);
}
/*---------------------------------------*/
void wr_lcd (unsigned char dat_comm,unsigned char content)
{
  chk_busy ();
  if(dat_comm)
   {
    rs=1;   //data
    rw=0;   //write
   }
  else 
   {
    rs=0;   //command
    rw=0;   //write
   }
  P0=content;   //output data or comm
  e=1;
  ;
  e=0;
}

void chk_busy (void)
{
  P0=0xff;
  rs=0;
  rw=1;
  e =1;
  while(busy==1);
  e =0;
}

void delay2 (unsigned int us)   //delay time
{
  while(us--);
}
void delay1 (unsigned int ms)
{
  unsigned int i,j;
  for(i=0;i<ms;i++)
  for(j=0;j<15;j++)
  delay2(1);
}