求大神幫忙解釋，希望可以詳細一點

ID:193395 · 發表于 2017-5-11 13:13

#include "std_for_wym.h"

void LCDWriteCom(unsigned char com)
{
RS_L;
RW_L;
READ_DATA = com;
EN_H;
DelayMs(5);
EN_L;
}
void LCDWriteData(unsigned char dat)
{
RS_H;
RW_L;
READ_DATA = dat;
EN_H;
DelayMs(5);
EN_L;
}
/*******************************************************************************
**函數名稱：LCD_Write_str()
**函數功能：在LCD上寫入一串字符
**輸入口：hang : 要寫入的行，add 要寫入列 *s要寫入的指針數組
**輸出口：無
**返回值：無
**備注：strlen()是引用庫函數string.h  ,可以求出數組的長度
**日期：2014.2.22
*******************************************************************************/
void LcdWriteStr(unsigned char hang,unsigned char add,char*s)
{
unsigned char i;
unsigned char length = 0;
if(hang==1)
LCDWriteCom(0x80+add);
else
LCDWriteCom(0x80+0x40+add);
length = strlen(s);
for(i=0;i<length;i++)
   LCDWriteData(*s++);       //指針送完數據后自加一
}

//能像printf一樣使用
void Lcd1602Printf( unsigned char x, unsigned char y, unsigned char *p,...)
{
char idata LcdBuf[17];
  va_list ap;
  va_start(ap, p);
vsprintf(LcdBuf,p,ap);
va_end(ap);
  LcdWriteStr(x,y,LcdBuf);
}

void Init_1602(void)
{
   LCDWriteCom(0x38);
   LCDWriteCom(0x0c);
   LCDWriteCom(0x06);
   LCDWriteCom(0x01);
   DelayMs(2);
}