原创 基于ST7920控制器的LCD串行程序

/****************************************************
               文件名称:LCD_串行
               摘    要:以凌阳61做为控制器,
                           LCD的控制器为STC7920
                           IOB0 ------LCD_CS
                           IOB1-------LCD_STD
                           IOB2-------LCD_SCLK 
                       
               当前版本:1.1
               完成日期:2007.7.31
              
               替代版本:1.0
               完成日期:2007.7.27
              
              
              
             
****************************************************/

#include "SPCE061A.h"

#define  LCD_WIDTH      15         //LCD  width
#define  LCD_NextLine   LCDSendCmd(0x00,0x90)
#define  LCD_Data       *P_IOB_Data
/*************************************
*****************串口函数库***********
*************************************/
//延时,时间精度不确定
void Delay(unsigned int t)
{
 unsigned int i;
 while (i = 1000,t --)
  while (i --)
   ;
  
}

//发送数据
void LCDSendByte(unsigned char dat)
{
 unsigned char i = 0;
 unsigned char a = 0;
 LCD_Data |= 0x0001;
 for ( ;i < 8;i ++)
 {
   if(dat & 0x80)
   
   LCD_Data |= 0x0002;
  
  else
  
     LCD_Data  &= 0xFFFD;
    
     LCD_Data  |= 0x0004;
     LCD_Data  &= 0xFFFB;
     dat <<= 1;
     for (a = 0;a < 10;a ++)
            ;
 }
 
 LCD_Data &= 0xFFFE;
 
}

//发送命令
void LCDSendCmd(unsigned char cmd,unsigned char param)
{
 unsigned char a;
 a = cmd;
 cmd &= 0x02;
 a &= 0x01;
 a <<= 2;
 cmd |= a;
 cmd |= 0xF8;
 LCDSendByte(cmd);
 
 a= param;
 a &= 0xF0;
 param <<= 4;
 param &= 0xF0;
 LCDSendByte(a);
 LCDSendByte(param);
 LCD_Data &= 0xFFFE;
 
}

//显示字符
void LCDSendChar(unsigned char ch)
{
  if (ch == '\n')
  LCD_NextLine;
 else
     LCDSendCmd(0x02,ch);
    
}

//显示字符串
void LCDSendString(unsigned char *s)
{
 unsigned int i = 0;
 while (s)
 {
   if (s == '\n')
   //LCD_NextLine;
      LCDSendCmd(0x00,0x90);
  
  else
      LCDSendCmd(0x02,s);
  i ++;
  if (i % 20 ==0)
   //LCD_NextLine;
      LCDSendCmd(0x00,0x90);
 };
}