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標題: 求助！PIC16f877驅動240128液晶不顯示 [打印本頁]

作者: christian 時間: 2015-3-23 00:15
標題: 求助！PIC16f877驅動240128液晶不顯示
#include<pic.h>
#define uchar unsigned char
#define uint unsigned int
#define LCM_WR RB1
#define LCM_RD RB2
#define LCM_CE RB0
#define LCM_CD RA3
#define LCM_RST RA2
#define FS1 RA1  //write seize
#define LCM_DATA PORTD
#define LCM_COMMD PORTD
#define  nop()  asm("nop")
__CONFIG(0x3B31);
void init_IO();
void init_LCM();
void delay_um(uint um);
void delay_ms(uint ms);
void LCD_RESET();
uchar chk_busy();
void Write_Data(uchar da);
void Write_Command(uchar cd);
void WriteDataCommand(uchar Data,uchar Command);
void WriteData2Command(uchar Data1,uchar Data2,uchar Command);
void Check_Status_LCM();
void Write_LCM(const unsigned char *pt);
void LCMClearScreen();
const unsigned char TAB1B[ ] = {" WWW+34677.CO"};
void main()
{
init_IO();
LCD_RESET();
init_LCM();
LCMClearScreen();
while(1)
{
      Write_LCM(TAB1B);
      delay_ms(1000);
}

}
void Write_LCM(const unsigned char *pt)
{
WriteData2Command(0x00,0x00,0x24);
Write_Command(0xB0);
while(*pt)                      //檢測是否達到了字符串最后
{
      Write_Data(*pt++);  //發送數據給lcd
      delay_ms(30);
}
}
void delay_us(uint um)
{
int i;
for(i=0;i<um;i++)
      ;
}
void delay_ms(uint ms)
{
uint i;
uchar j;
for(i=ms;i>0;i--)
      for(j=110;j>0;j--)
         ;
}
void init_IO()
{
TRISD=0x00;
PORTD=0xff;
TRISA=0x00;
PORTA=0xff;
TRISB=0x00;
PORTB=0xff;
FS1=1;
}
void init_LCM()
{

WriteData2Command(0x00,0x00,0x21);
WriteData2Command(0x03,0x00,0x22);
WriteData2Command(0x00,0x00,0x24);

WriteData2Command(0x24,0x00,0x40);
WriteData2Command(0x1e,0x00,0x41);
WriteData2Command(0x00,0x00,0x42);
WriteData2Command(0x1e,0x00,0x43);

Write_Command(0xa0);
Write_Command(0x80);
Write_Command(0x9f);
}

void WriteDataCommand(uchar Data,uchar Command)
{
Write_Data(Data);
delay_ms(20);
Write_Command(Command);
delay_ms(20);
}

void WriteData2Command(uchar Data1,uchar Data2,uchar Command)
{
Write_Data(Data1);
delay_ms(20);
Write_Data(Data2);
delay_ms(20);
Write_Command(Command);
delay_ms(20);
}
void Write_Data(uchar da)
{
Check_Status_LCM();
LCM_DATA=da;
LCM_CD=0;

LCM_CE=0;
LCM_RD=1;
LCM_WR=0;

nop();
nop();
LCM_WR=1;
LCM_CE=1;
LCM_CD=1;
}
void Write_Command(uchar cd)
{
Check_Status_LCM();
LCM_COMMD=cd;
LCM_CD=1;
LCM_CE=0;
LCM_RD=1;
LCM_WR=0;
nop();
nop();
nop();
LCM_WR=1;
LCM_CE=1;
LCM_CD=0;
}
//清屏
void LCMClearScreen()
{
uint i;
WriteData2Command(0x00,0x00,0x24);
Write_Command(0xB0);
for(i=0;i<8192;i++)//8k
{
   Write_Data(0x00);//寫數據
}
Write_Command(0xB2);
}

void LCD_RESET()
{
LCM_RST=0;
delay_ms(2);
LCM_RST=1;
delay_ms(10);
}
uchar chk_busy()
{
uchar temp ;

TRISD=0xff;
PORTD=0x00;
LCM_CD=1; //1
LCM_CE=0;
LCM_RD=0;
temp=PORTD;
nop();
LCM_RD=1;
LCM_CE=1;
LCM_CD=0;
TRISD=0x00;
PORTD=0x00;
return temp ;
}
void Check_Status_LCM()
{
uint xa;
uint xi;
for(xi = 0; xi < 200; xi++)
{
      xa =chk_busy();
      if((xa & 0x03) == 0x03)
         break;
}

}

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