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I/O接口与LCD引脚的连接详见源代码注释.
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//带中文字库的12864LCD显示程序
#include <reg52.H>
#include <intrins.H>6 w* f- k4 l( I" ]9 v4 W* v" ~# m
#define uchar unsigned char
#define uint unsigned int
sbit dula = P2^6;
sbit wela = P2^7;
//SCM12864-05端口定义
#define LCD_DATA P0 //数据口0 c( L6 E' _: u' u u
sbit RS = P3^5; //并行的指令/数据选择信号, H数据, L命令
sbit RW = P3^6; //并行读写选择信号, H读, L写1 g7 D2 e8 M- ^+ M6 s
sbit E = P3^4; //并行使能端, H有效, L无效& H- X3 N# ~4 @
sbit PSB = P3^7; //并/串接口选择, H并,L串6 J- Q; \8 D6 V8 S
sbit RET = P3^3; //复位, L有效0 n" @- V4 P; _8 W0 p+ L
uchar code datas1[] = {"广东工业大学"};
uchar code datas2[] = {"自动化学院2004级"};: J" G3 |+ ^# I; f- r( j
uchar code datas3[] = {"网络工程 (4)班"};
uchar code datas4[] = {"fengmk2@gmail.com"};6 ]( N& O! O, n' ?- L
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//延时约2us$ o7 h! j- G* g- N" D
void delayUs(), e+ H9 e( _8 O F/ P# m+ n9 B& d
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_nop_();_nop_();
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//延时 a * 1ms
void delayMs(uint a)" M# n7 x$ ]6 v! j! n6 p
{
uint i, j;/ G. b7 |7 G6 B4 [
for(i = a; i > 0; i--)
for(j = 100; j > 0; j--); X4 F3 B o3 c$ J3 N/ V1 r }
}
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//检测LCD是否处于忙状态, 若忙返回1, 空闲返回0+ Z' C* D# f X) {& f
bit checkBusy()
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bit busy;0 Z2 a2 s8 o; Y: P; X/ n+ ^8 n7 D" |
RS = 0;
RW = 1;, E' g$ s/ V. p+ M) i4 H
E = 1;
delayUs();
busy = (bit)(LCD_DATA&0x80);, h+ r4 d8 y+ l+ e) {
E = 0;1 l1 a, _9 g/ c% A
return busy;
}
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//等待LCD到空闲7 P+ U4 ]7 E9 ]* |- D+ t
void wait()
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while(checkBusy());
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//写命令
void writeCmd(uchar cmd); h4 Z! O+ t- O) G* m+ A0 z; X# q
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wait();
RS = 0;2 ~( q7 X- z% E9 @# N
RW = 0;) @, h; H: J4 `3 J4 ~9 ?$ d F
E = 0;
delayUs();' P. r5 N4 z& M# S( l
LCD_DATA = cmd;; X/ ^+ }, p6 O
delayUs();
E = 1;
delayUs();
E = 0;% e# K; G7 C+ ]/ ]& F
}
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//写数据
void writeData(uchar dat) V+ `" u7 u S, O: e( E2 g
{
wait();
RS = 1;
RW = 0;. L/ {9 ~/ Q9 k6 {+ C# q+ g
E = 0;" M$ \9 `2 s, `( F4 b
delayUs();
LCD_DATA = dat;0 D" C0 R; v2 [; m6 H
delayUs();
E = 1;/ Z( C1 \1 g; P4 ~. F. K$ ~& R- w# f1 a
delayUs();! w2 o3 o9 q8 x
E = 0;* i9 e, ?) V0 u
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//初始化LCD
void init()
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PSB = 1; //并口方式
writeCmd(0x30); //基本指令, 扩充指令为34H
delayMs(10);' t, Y; v8 I6 `+ ]; g" z3 o
writeCmd(0x0c); //显示开, 关光标9 S7 G$ M6 W0 h# B& R- z0 c
delayMs(10);
writeCmd(0x01); //清屏
delayMs(10);
}
void setPosition(uchar x, uchar y)
{! M( I9 G( U7 @: P
uchar p;
switch(x%4)' _% P1 @0 v! U1 i/ z7 |3 z6 q" A
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case 0: p = 0x80; break; //第一行开始地址
case 1: p = 0x90; break; //第二行
case 2: p = 0x88; break; //第三行
case 3: p = 0x98; break; //第四行
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p += y;
writeCmd(p);
}
void writeString(uchar * str)
{
uchar i = 0;
while(str != '\0')
{
writeData(str[i++]);
}
}
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/***************************LCD12864***************************************/
void main()
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//先关闭数码管, 使两个锁存器锁存, 因开了数码管, USB电压驱动不够, 将无法使LCD正常工作
dula = wela = 0;
init();
setPosition(0, 0);
writeString(datas1);$ b, v: n0 V9 f
setPosition(1, 0);$ ~3 U) Z) Z9 E8 h
writeString(datas2);
setPosition(2, 0);- I/ ~' q6 d/ E3 |1 X. F) p
writeString(datas3);
setPosition(3, 0);
writeString(datas4);
while(1);
} |
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发表于 2018-11-28 15:43:04