NOKIA5110屏幕驱动程序
虽然今年的单片机比赛已经结束，但我想我还远不会和单片机说拜拜。它是学习硬件知识的最佳选择，虽然我们学它主要是在写程序，但不得不说学习到不少的新知识。有时你会很无奈地说句“硬件这东西。。。”，我想这也正是硬件的魅力。
虽然今年换了比较大型的板子必比赛，用的事TFT彩屏来演示程序，单学习屏幕还是应该晓得最简单点的，像以前使用的NOKIA5110的屏，驱动如下：
NOKIA5110.H文件：
#ifndef __NOKIA5110_H__ #define __NOKIA5110_H__ #include <reg52.h> #include <string.h> typedef unsigned char uchar; extern uchar Lcd_x,Lcd_y; extern uchar Datas[6][84]; sbit N_CS = P1^1; // chip selected. sbit N_RS = P1^0; // reset. sbit N_DC = P1^2; // write data or write command(1/0). sbit N_DI = P1^3; // data in. sbit N_CL = P1^4; // clock. void LcdInit(void); // NOKIA5110 LCD init. void Clear(void); // clear full screen. void WriteByte(uchar dat,bit f_dc); // Write byte, f_dc is flag bit. void SetPos(uchar _x,uchar _y); void PutPixel(uchar _x,uchar _y,uchar f_c); void Line(char x0,char y0,char x1,char y1,uchar f_c); void Rectangle(char x0,char y0,char x1,char y1,char f_c); void Circle(char x0,char y0,char r,uchar f_c); void PutChar(char x0,char y0,char c0); void PutString(char x0,char y0,char* s); uchar GetPixel(char x0,char y0); #endifNOKIA5110.C文件：
#include "NOKIA5110.H" // function's hand define
#include "DELAY.H" // delay functions
#include "CONSTANT.H" // constants
uchar Lcd_x,Lcd_y; // point's position
uchar Datas[6][84];
void LcdInit(void)
{
N_RS = 0; // reset
delayms(10);
N_RS = 1;
WriteByte(0x21,0); // use expansion directive
WriteByte(0xC6,0); //
WriteByte(0x06,0); // temp
WriteByte(0x13,0); // 1:48
WriteByte(0x20,0); // use base directive
WriteByte(0x0C,0); // normal
Clear(); // Init Clear
SetPos(0,0); // Init Position
}
void WriteByte(uchar dat,bit f_dc)
{
uchar i;
N_CS = 0; // open chip selected
N_DC = f_dc; // data selected or command selected
for(i=0; i<8; i++)
{
if(dat&0x80) N_DI = 1; // from high bit to low bit
else N_DI = 0; //
dat <<= 1; // next bit
N_CL = 0; N_CL = 1; // rising edge
}
N_DI = N_CS = N_DC = 1; // set 1
}
void SetPos(uchar _x,uchar _y)
{
WriteByte(0x80|_x,0); // set x
WriteByte(0x40|_y,0); // set y
Lcd_x=_x; Lcd_y=_y; // record x and y
}
void Clear(void) // clear screen
{
int i = 504; // 504 byte
SetPos(0,0);
while(i--) WriteByte(0x00,1);
memset(Datas,0,sizeof(Datas)); // record for every point
}
void PutPixel(uchar _x,uchar _y,uchar f_c)
{
uchar _over = _y%8; // over position
_y /= 8; // 8 bit for div
SetPos(_x,_y);
if(f_c) Datas[_y][_x] |= 1 << _over; // judge set or clear
else Datas[_y][_x] &= ~(1 << _over);
WriteByte(Datas[_y][_x],1); // do it
}
void Line(char x0,char y0,char x1,char y1,uchar f_c) // line from (x0,y0) to (x1,y1)
{
char dx,dy,di,dx_x2,dy_x2,dx_sym,dy_sym;
dx = x1 - x0;
dy = y1 - y0;
if(dx > 0) dx_sym = 1;
else dx_sym = -1;
if(dy > 0) dy_sym = 1;
else dy_sym = -1;
dx = dx_sym * dx;
dy = dy_sym * dy;
dx_x2 = dx * 1;
dy_x2 = dy * 1;
if(dx >= dy)
{
di = dy_x2 - dx;
while(x0 != x1)
{
PutPixel(x0,y0,f_c);
x0 +=dx_sym;
if(di < 0) di += dy_x2;
else
{
di += dy_x2 - dx_x2;
y0 += dy_sym;
}
}
}
else
{
di = dx_x2 - dy;
while(y0 != y1)
{
PutPixel(x0,y0,f_c);
y0 += dy_sym;
if(di < 0) di += dx_x2;
else
{
di += dx_x2 - dy_x2;
x0 += dx_sym;
}
}
}
PutPixel(x0,y0,f_c);
}
void Circle(char x0,char y0,char r,uchar f_c)
{ // (x0,y0) for the center of the circle, r for radius
char a=0,b=r,di=3-2*r;
while(a <= b)
{
PutPixel(x0-b,y0-a,f_c);
PutPixel(x0+b,y0-a,f_c);
PutPixel(x0-a,y0+b,f_c);
PutPixel(x0-b,y0-a,f_c);
PutPixel(x0-a,y0-b,f_c);
PutPixel(x0+b,y0+a,f_c);
PutPixel(x0+a,y0-b,f_c);
PutPixel(x0+a,y0+b,f_c);
PutPixel(x0-b,y0+a,f_c);
a ++;
if(di < 0) di += 4 * a + 6;
else
{
di += 10 + 4 * (a - b);
b --;
}
PutPixel(x0+a,y0+b,f_c);
}
}
void Rectangle(char x0,char y0,char x1,char y1,char f_c)
{
Line(x0,y0,x1,y0,f_c); Line(x0,y0,x0,y1,f_c);
Line(x1,y0,x1,y1,f_c); Line(x0,y1,x1,y1,f_c);
}
void PutChar(char x0,char y0,char c0)
{ // give point of left top and put the char
char i, j;
if(c0<ascii_begin||c0>=ascii_end) return;
for(i=0; i<6; i++)
{
uchar tc=Ascii[c0-ascii_begin][i];
for(j=0; j<8; j++)
{
PutPixel(x0+i,y0+j,tc&0x01);
tc >>= 1;
}
}
}
void PutString(char x0,char y0,char* s)
{ // Put a string, if too long, it will get next line.
while(*s)
{
if(x0>78){ x0=0; y0+=8; }
PutChar(x0,y0,*s++);
x0+=6;
}
}
uchar GetPixel(char x0,char y0) // get give point's message.
{
return (Datas[y0/8][x0]&(1<<(y0%8)));
}