PIC18驱动LCD 5110屏幕不显示东西是怎么回事啊？

只看该作者 · 2016-1-13 19:00

如题，屏幕会亮但是没有显示，求大神看看程序！
#define uint unsigned int
#define uchar unsigned char
#define res    PORTCbits.RC5
#define sce    PORTCbits.RC4       //片选PORTAbits.RA0
#define dc    PORTCbits.RC3       //1些数据，0写指令
#define sdin PORTCbits.RC6       //数据
#define sclk PORTCbits.RC7       //时钟
void LCD_init(void);
void init(void);
void LCD_write_byte(unsigned char dt,unsigned char command);
void delay(uint x);
void LCD_set_XY(unsigned char X,unsigned char Y);
void LCD_clear(void);
void LCD_write_char(unsigned char x,unsigned char y,unsigned char c);
void LCD_write_english_string(unsigned char X,unsigned char Y,char *s);

void main(void)
{
init();
LCD_init();//初始化LCD模块
LCD_clear();//清屏
while(1)
{
    LCD_write_english_string(0,0," Welcome to  ");
LCD_write_english_string(0,1," Amy  studio ");
LCD_write_english_string(0,2,"amy-studio.com");
LCD_write_english_string(0,3," Nokia5110 LCD");
}
// while(1)
  //  {
//       asm("CLRWDT");
// }
}

void init(void)  //单片机初始化
{
asm("CLRWDT");
ADCON1=0x06;
TRISC=0x00;
PORTB=0x00;
}

void LCD_write_byte(unsigned char dt,unsigned char command)
{
unsigned char i;
sce = 0;       //片选
dc = command; //1写数据，0写指令
for(i=0;i<8;i++) //循环传送8个bit
{
      if(dt&0x80)
         sdin=1;
      else
         sdin=0;
      dt=dt<<1;
      sclk = 0;
      asm("CLRWDT");
      asm("CLRWDT");
      sclk=1;    //在时钟上升沿采样
}
dc=1;
sce=1;
sdin=1;
}

void LCD_init(void)    //LCD初始化
{
res=0;
delay(10);
res=1;
sce=0;    //sce为高时，串行口被初始化。sce为高时忽略始时钟信号。
delay(10);
sce=1;
LCD_write_byte(0x21,0);//0b0010 0001LCD功能设置：芯片活动，水平寻址，使用扩展指令
LCD_write_byte(0xc6,0);//设置VOP值
LCD_write_byte(0x06,0);//温度校正
LCD_write_byte(0x13,0);//1:48
LCD_write_byte(0x20,0);//LCD功能设置：新品活动，水平寻址，使用基本指令
LCD_clear();
LCD_write_byte(0x0c,0);//设定显示配置：普通模式

sce=0;
}

void LCD_set_XY(unsigned char X,unsigned char Y)// 位置选择
{
LCD_write_byte(0x40|Y,0);
LCD_write_byte(0x80|X,0);
}

void LCD_clear(void) //清屏
{
unsigned char t;
unsigned char k;
LCD_set_XY(0,0);
for(t=0;t<6;t++)
{
      for(k=0;k<84;k++)
      {
         LCD_write_byte(0x00,1);
         asm("CLRWDT");
      }
}
}

void LCD_write_char(unsigned char x,unsigned char y,unsigned char c)//写数据
{
unsigned char line;
c -= 32;
LCD_set_XY(x*6,y);
for(line=0;line<6;line++)
      LCD_write_byte(font6x8[c][line],1);
}

void delay(uint x)//延时程序
{
uint a,b;
for(a=x;a>0;a--)
      for(b=110;b>0;b--);
}

void LCD_write_english_string(unsigned char X,unsigned char Y,char *s)
{
LCD_set_XY(X,Y);
while(*s)
{
      LCD_write_char(X,Y,*s);
      s++;
}
}