📄 lcd.c
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#include <reg51.h>
#include <intrins.h>
#include <stdio.h>
#define uchar unsigned char
#define uint unsigned int
////////////////////////////////////////////////////
// ASCII characters 宋体 12 (8*16)
uchar code ascii[96][16];
//----------------------------------------------
// Variables
//----------------------------------------------
/*
//dip-switch
sbit cs1 = P1^3;
sbit cs2 = P1^4;
sbit di = P1^0;
sbit rw = P1^1;
sbit en = P1^2;
*/
//keyboard
sbit cs1 = P1^4; // High active
sbit cs2 = P1^3;
sbit di = P1^7;
sbit rw = P1^6;
sbit en = P1^5;
sfr lcddata=0xA0; // P2
uchar addr[] = {0,0}; // x,y address x:0~7;y:0~127
sbit flag = P3^7;
//-----------------------------------
// Status regester
#define Busy 0x80
#define OnOff 0x20
#define Reset 0x10
//-----------------------------------
// Command word
#define DISPON 0x3f
#define DISPOFF 0x3e
#define DISPFIRST 0xc0
//----------------------------------------------
// Functions
//----------------------------------------------
void InitLCD(void); // Initialize the system
uchar read(bit m); // Read a data from LCD
// m=0 indicate instruction, m=1 indicate data
void write(uchar c,bit m); // Write a data to LCD
// m=0 indicate instruction, m=1 indicate data
void set_addr(uchar x,uchar y); // Set the x and y address. x:(0-7) y:(0-127)
uchar test_status(uchar ref); // Test the status of LCD
// 0x80-busy:0x20-on/off:0x10-reset
void printc(uchar cha); // Display a character on LCD
// Seting the address is necessary before calling.
void prints(uchar *cha); // Display a string on LCD. The lenth is less than 18.
// Seting the address is necessary before calling.
uchar select_ic(uchar y); // If y address is larger than 63 then shift to IC2
extern uchar log2(uchar);
void print(void);
void clear(void);
void init(void);
extern uchar scan(void);
//----------------------------
// Clear the screen
void clear(void)
{
for (addr[0]=0;addr[0]<8;addr[0]++)
for (addr[1]=0;addr[1]<128;addr[1]++)
{
if ((addr[1] == 64) | (addr[1] == 0))
set_addr(addr[0],addr[1]);
write(0x00,1);
}
}
/*------------------------------------------------
// Caculates the 2 logarithm for
// the unsigned char number "Unm"
// Note: the return value is the reality log2(n)+1
unsigned char log2(unsigned char Power)
{
unsigned char Index=0;
while (Power)
{
Power >>= 1;
Index++;
}
return (Index-1);
}*/
//----------------------------------------------
// Display a string on LCD
void prints(uchar *cha)
{
while (*cha != '\0')
{
// if (*cha == '\n')// Test for CR
// {
// set_addr(addr[0]+2,0) // Call process of control character
// }
printc(*cha);
cha++;
};
}
//----------------------------------------------
// Display a character on LCD
void printc(uchar cha)
{
uchar i,cursor = addr[1];
// Caculate the first address of font
cha -= 0x20;
// Output upper page
for (i=0;i<8;i++)
{
if (cursor == 64)
set_addr(addr[0],cursor);
write (ascii[cha][i*2],1);
cursor++;
};
cursor = addr[1];
addr[0] += 1;
set_addr(addr[0],addr[1]);
// Output lower page
for (i=0;i<8;i++)
{
if (cursor == 64)
set_addr(addr[0],cursor);
write (ascii[cha][i*2+1],1);
cursor++;
};
addr[0] -= 1; // Initialize the x to the up page
addr[1] += 8;
if (addr[1] > 120)
{
addr[0] += 2; // Next line
addr[1] -= 120;
};
set_addr(addr[0],addr[1]); // Point next location
}
/*----------------------------------------------
// Test the status of LCD
uchar test_status(uchar ref)
{
uchar temp = read(0);
temp &= ref;
return(temp);
}*/
//----------------------------------------------
// Select ic of display control
uchar select_ic(uchar y)
{
if (y > 63)
{
// Select IC2
cs1 = 0;
cs2 = 1;
y -= 64;
}
else
{
// Select IC1
cs1 = 1;
cs2 = 0;
};
return(y);
}
//----------------------------------------------
// Set the x and y address
void set_addr(uchar x,uchar y)
{
addr[0] = x;
addr[1] = y;
y = select_ic(y); // While y>63 shift to IC2 to control the display
// Process x address data, 1011 1AAA(binary) indicate x address
x |= 0xF8; // 1111 1000
x &= 0xBF; // 1011 1111
// Process y address data, 01AA AAAA(binary) indicate y address
y |= 0xC0; // 1100 0000
y &= 0x7F; // 0111 1111
// Output x address
write(x,0);
// Output y address
write(y,0);
}
//---------------------------------
// Initialize the system
void init(void)
{
SCON = 0x50; // Setup serial port control register
// Mode 1: 8-bit uart var. baud rate
// REN: enable receiver
PCON &= 0x7F; // Clear SMOD bit in power ctrl reg
// This bit doubles the baud rate
}
//--------------------------
// InitLCD
void InitLCD(void)
{
uint TimeOut = 0;
while (TimeOut < 20000)
TimeOut++;
cs1 = 1;
cs2 = 0;
write(DISPOFF,0);
cs1 = 0;
cs2 = 1;
write(DISPOFF,0);
cs1 = 1;
cs2 = 0;
write(DISPON,0);
cs1 = 0;
cs2 = 1;
write(DISPON,0);
cs1 = 1;
cs2 = 0;
write(DISPFIRST,0);
cs1 = 0;
cs2 = 1;
write(DISPFIRST,0);
clear();
TimeOut = 0;
while (TimeOut < 20000)
TimeOut++;
set_addr(0,0);
}
//---------------------------
// Write data
void write(uchar cha,bit m)
{
while (read(0) & Busy);
di = m;
rw = 0;
lcddata = cha;
en = 1;
_nop_();
en = 0;
}
//---------------------------
// Read data
uchar read(bit m)
{
uchar rcha;
di = m;
rw = 1;
lcddata = 0xff;
en = 1;
_nop_();
rcha = lcddata;
en = 0;
return rcha;
}
//---------------------------------------------
void main(void)
{
uchar disp[64];
uint keypress;
// Code of constructing the string which to be displayed on LCD
init();
InitLCD();
while (1)
{
keypress = scan();
sprintf(disp,"%d",keypress);// Constructe the string
// which will be displayed later.
clear();
set_addr(5,0);
prints(disp); // Display the string on screen
}
}
/**************************************************/
/*----点阵转换时间：2004/11/20 7:56:23----*/
uchar code ascii[96][16] =
/*---8x16--*/
{
/*--- ---*/
{0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
/*--- ! ---*/
{0x00,0x00,0x00,0x00,0x00,0x00,0xF8,0x33,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00},
/*--- " ---*/
{0x00,0x00,0x10,0x00,0x0C,0x00,0x06,0x00,0x10,0x00,0x0C,0x00,0x06,0x00,0x00,0x00},
/*--- # ---*/
{0x40,0x04,0xC0,0x3F,0x78,0x04,0x40,0x04,0xC0,0x3F,0x78,0x04,0x40,0x04,0x00,0x00},
/*--- $ ---*/
{0x00,0x00,0x70,0x18,0x88,0x20,0xFC,0xFF,0x08,0x21,0x30,0x1E,0x00,0x00,0x00,0x00},
/*--- % ---*/
{0xF0,0x00,0x08,0x21,0xF0,0x1C,0x00,0x03,0xE0,0x1E,0x18,0x21,0x00,0x1E,0x00,0x00},
/*--- & ---*/
{0x00,0x1E,0xF0,0x21,0x08,0x23,0x88,0x24,0x70,0x19,0x00,0x27,0x00,0x21,0x00,0x10},
/*--- ' ---*/
{0x10,0x00,0x16,0x00,0x0E,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
/*--- ( ---*/
{0x00,0x00,0x00,0x00,0x00,0x00,0xE0,0x07,0x18,0x18,0x04,0x20,0x02,0x40,0x00,0x00},
/*--- ) ---*/
{0x00,0x00,0x02,0x40,0x04,0x20,0x18,0x18,0xE0,0x07,0x00,0x00,0x00,0x00,0x00,0x00},
/*--- * ---*/
{0x40,0x02,0x40,0x02,0x80,0x01,0xF0,0x0F,0x80,0x01,0x40,0x02,0x40,0x02,0x00,0x00},
/*--- + ---*/
{0x00,0x01,0x00,0x01,0x00,0x01,0xF0,0x1F,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x00},
/*--- , ---*/
{0x00,0x80,0x00,0xB0,0x00,0x70,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
/*--- - ---*/
{0x00,0x00,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01,0x00,0x01},
/*--- . ---*/
{0x00,0x00,0x00,0x30,0x00,0x30,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00},
/*--- / ---*/
{0x00,0x00,0x00,0x60,0x00,0x18,0x00,0x06,0x80,0x01,0x60,0x00,0x18,0x00,0x04,0x00},
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