今天测试LCM12864液晶,调试挺长时间的程序液晶始终都没有显示,正在一筹莫展的时候,发现液晶的背光突然变暗,赶紧检查开发板,发现板子上的MAX232发烫,立即关掉开发板上的电源开关,推断是USB转串口线或者是MAX232坏了,现在只能先换一条备用的USB转串口线试试,换完之后MAX232不烫了,唉!好几十块的劣质USB转串口坑爹呐!不过还好,换完USB转串口线就找出液晶不显示的原因了,原来是延时函数的事,有点粗心了。。。




测试程序:
#include <STC12C5A60S2.H> //STC头文件
/*********************************************************************************************/
/*--  调入了一幅图像:C:\Documents and Settings\地质\桌面\logo.bmp  --*/
/*--  宽度x高度=128x22  --*/
unsigned char code logo[] =                 
{
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xFF,0xFF,0xFF,0xFF,0xFF,0xC7,0x81,0xE0,0x7C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xFF,0xFF,0xFF,0xFF,0xFF,0xF3,0x83,0xE0,0x7C,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xFF,0xFF,0xFF,0xFF,0xFF,0xF9,0x87,0xF0,0x7C,0x03,0x00,0x80,0x80,0x00,0x00,0x00,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFC,0x87,0xF0,0xFC,0x06,0x03,0x41,0xC0,0xC0,0x00,0xC0,
0xFF,0xFF,0xFF,0xFF,0xFF,0xFE,0x47,0xF0,0xFC,0x03,0xC0,0x40,0x41,0x40,0x22,0xE0,
0xFC,0x01,0xF0,0x00,0xF8,0x7E,0x07,0xF8,0xFC,0x07,0x00,0x81,0xE1,0x82,0xA3,0xC0,
0xFC,0x01,0xF0,0x00,0xF8,0x3F,0x0F,0xF8,0xF8,0x14,0x07,0xE2,0x40,0x27,0xF1,0x00,
0xFF,0xF9,0xF0,0x00,0xF8,0x3F,0x0F,0xF8,0xF8,0x12,0x80,0x82,0xC3,0x72,0xA3,0xE0,
0xFF,0xF9,0xFF,0xFF,0xF8,0x7F,0x0F,0xF8,0xF8,0x0B,0x80,0x82,0xC5,0x52,0x63,0x18,
0xFF,0xF9,0xFF,0xFF,0xFF,0xFE,0x5F,0xFD,0xF8,0x07,0x02,0x84,0xE3,0x61,0xF5,0x80,
0xFF,0xF9,0xFF,0xFF,0xFF,0xFE,0x5F,0x7D,0xF8,0x01,0x81,0x04,0x00,0x00,0x00,0x80,
0xFF,0xF9,0xFF,0xFF,0xFF,0xFC,0xDF,0x7D,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xFC,0x01,0xFF,0xFF,0xFF,0xF9,0xFE,0x3F,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xFC,0x01,0xF0,0x00,0xFF,0xF3,0xFE,0x3F,0xF0,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0xFC,0x01,0xF0,0x00,0xFF,0xC3,0xFE,0x3F,0xF0,0x00,0xE1,0xE3,0x66,0x03,0x8D,0x80,
0xFC,0x01,0xF0,0x00,0xF8,0x03,0xFE,0x3F,0xE0,0x01,0xFB,0xF3,0xFF,0x07,0xEF,0xC0,
0xFF,0xFF,0xFF,0xFF,0xF8,0x03,0xFC,0x1F,0xE0,0x03,0x03,0x33,0xBB,0x0C,0x0E,0xC0,
0xFF,0xFF,0xFF,0xFF,0xF8,0x01,0xFC,0x1F,0xE0,0x03,0x03,0x33,0x33,0x0C,0x0C,0xC0,
0xFF,0xFF,0xFF,0xFF,0xF8,0x01,0xFC,0x1F,0xE0,0x1B,0x9B,0x33,0x33,0x6E,0x6C,0xC0,
0xFF,0xFF,0xFF,0xFF,0xF8,0x00,0x70,0x07,0x80,0x19,0xF1,0xE3,0x33,0x67,0xCC,0xC0,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,
};
/*****************************************************************************/
/****************************************************************************/
//LCD接口定义
sbit RS =  P2^4; //模式位,为0输入指令,为1输入数据
sbit RW =  P2^5; //读写位,为0读,为1写
sbit E  =  P2^6; //使能位
#define Lcd_Bus   P0 //数据总线
sbit PSB = P2^1; //H:8位或4位并口方式,L:串口方式
sbit NC  = P2^2; //空脚
sbit RES = P2^3; //复位端,低电平有效
/*****************************************************************************/
/*********************************************************************************************/
void DELAY_MS (unsigned int a){
 unsigned int i;
 while( a-- != 0){
  for(i = 0; i < 600; i++);
 }
}
/*********************************************************************************************/
/******************************************************************************/
//LCD驱动(DY12864CBL液晶显示屏并口驱动程序)
/******************************************************************************/
void chk_busy(){//检查忙位
   RS=0;
   RW=1;
   E=1;
   Lcd_Bus=0xff;
   while((Lcd_Bus&0x80)==0x80);
   E=0;
}
/******************************************************************************/
void write_com(unsigned char cmdcode){//写命令到LCD
 chk_busy();
 RS=0;
 RW=0;
 E=1;
 Lcd_Bus=cmdcode;
 E=0;
}
/******************************************************************************/
void write_data(unsigned char Dispdata){  //写数据到LCD
 chk_busy();
 RS=1;
 RW=0;
 E=1;
 Lcd_Bus=Dispdata;
 E=0;
}
/******************************************************************************/
void lcm_init(){//初始化LCD屏)
   PSB = 1;               //H:8位或4位并口方式,L:串口方式
   NC  = 0;               //空脚
   RES = 1;               //复位端,低电平有效
   write_com(0x30);       //选择8bit数据流
   write_com(0x0c);       //开显示(无游标、不反白)
   write_com(0x01);       //清除显示,并且设定地址指针为00H
}
/*****************************************************************************/
void lcm_w_word(unsigned char *s){   //向LCM发送一个字符串,长度64字符之内。
 while(*s>0){      //
     write_data(*s); 
     s++;
   }
}
/******************************************************************************/
void lcm_w_test(bit i,unsigned char word){//写指令或数据
 if(i == 0){
  write_com(word); //写指令或数据(0,指令)
 }else{
  write_data(word);//写指令或数据(1,数据)
 }
}
/******************************************************************************/
void lcm_clr(void){//清屏函数
 lcm_w_test(0,0x01); 
}
/******************************************************************************/
 /******************************************************************************
//指定显示位置// (设置LCD显示的起始位置)
/******************************************************************************/
void LCD_set_xy(  unsigned char x, //X为行(1~4)
     unsigned char y ){ //Y为列(0~7)
    unsigned char address;
 switch(x){
  case 0: address = 0x80 + y; break;    
     case 1: address = 0x80 + y; break; 
  case 2: address = 0x90 + y; break; 
      case 3: address = 0x88 + y; break;
  case 4: address = 0x98 + y; break; 
  default:address = 0x80 + y; break;
 }
    lcm_w_test(0, address);
}
/******************************************************************************
//图形方式12864显示字模(横向8位左高位取模)
/******************************************************************************/
void Disp_img(unsigned char  *img){ 
 unsigned char i,j;
 unsigned int k = 0;
 lcm_w_test(0,0x36); //图形方式
 for(i=0;i<32;i++){ 
  lcm_w_test(0,0x80+i);
  lcm_w_test(0,0x80);
     for(j=0;j<16;j++) {
   lcm_w_test(1,img[k++]);
  }
   }
  for(i=0;i<32;i++){ 
  lcm_w_test(0,0x80+i);
  lcm_w_test(0,0x88);
     for(j=0;j<16;j++) {
   lcm_w_test(1,img[k++]);
    }
 }
} 
/*****************************************************************************/
//---主程序---//
/*****************************************************************************/
main() { 
 lcm_init();    //初始化液晶显示器
    Disp_img(logo);//显示图片测试内容
 DELAY_MS (10000);       
 lcm_clr();
  while(1){//主循环
 lcm_init();    //初始化液晶显示器
    LCD_set_xy(1,0); //写入字符的位置
 lcm_w_word("预祝电子产品世界"); //写入字符内容
 LCD_set_xy(2,0); 
 lcm_w_word("  MCU--DIY活动  "); 
 LCD_set_xy(3,0); 
 lcm_w_word("  取得圆满成功  "); 
 LCD_set_xy(4,0); 
 lcm_w_word(" www.eepw.com.cn"); 
 DELAY_MS (30000);      
  
      }
}