LCD1602液晶秒表C51程序

LCD1602液晶秒表C51程序

此程序是基于51hei单片机开发板上面写的，如需要移植到自己的电路上，修改相应的端口即可，开发板完整的电路图下载: 点这里（注意：只需要看1602部分即可，其他部分可以忽略）

/**

************************************************* **********************

* @file main.c

* @author xr

* @date 2014年5月8日22:11:33 -- 2014年5月9日12:03:49

* @version V1.2.3

* @brief LCD1602液晶跑表单片机STC89C52RC MCU 晶振 11.0592MHZ

************************************************* **********************

*/

#include ;

/* 系统时钟 */

#define SYS_XTAL (11059200UL/12)

/* 定时器T0重载值 */

unsigned char thr0, tlr0;

unsigned char thr1, tlr1;

/* 跑表计数 */

unsigned char timer[9] = {0, 0, 0, 0, 0, 0, 0, 0, 0}; //分别表示跑表的各个位上的数字

bit flag10ms = 0;

extern bit stopflag;//跑表走停标志位

extern void InitalLCD1602();

extern void LcdShowStr(unsigned char x, unsigned char y, unsigned char * str);

extern void KeyDriver();

extern void KeyScan();

void DisplayTimer();

void ConfigTimer0(unsigned int xms);

void ConfigTimer1(unsigned int xms);

/* 主函数main() */

void main(void)

{

ConfigTimer0(10); //定时10ms

ConfigTimer1(1);

InitalLCD1602();

LcdShowStr(0, 0, "stopwatch");

LcdShowStr(2, 1, "0000000.00s"); //液晶初始化显示

LcdShowStr(10, 0, "stop!");

while (1)

{

KeyDriver();

DisplayTimer();

if ((flag10ms == 1) && (stopflag == 1))

{

flag10ms = 0;

timer[0]++;

if (timer[0] >; 9)

{

timer[0] = 0;

timer[1]++;

if (timer[1] >; 9)

{

timer[1] = 0;

timer[2]++;

if (timer[2] >; 9) {

timer[2] = 0;

timer[3]++;

if (timer[3] >; 9) {

timer[3] = 0;

timer[4]++;

if (timer[4] >; 9) {

timer[4] = 0;

timer[5]++;

if (timer[5] >; 9) {

timer[5] = 0;

timer[6]++;

if (timer[6] >; 9) {

timer[6] = 0;

timer[7]++;

if (timer[7] >; 9)

{

timer[7] = 0;

timer[8]++;

if (timer[8] >; 9)

{

timer[8] = 0;

}

}

}

}

}

}

}

}

}

}

}

}

/* 将跑表时间显示到液晶上 */ void DisplayTimer()

{

unsigned char str[20];

/* 分解timer */

str[0] = timer[8] + '0';

str[1] = timer[7] + '0';

str[2] = timer[6] + '0';

str[3] = timer[5] + '0';

str[4] = timer[4] + '0';

str[5] = timer[3] + '0';

str[6] = timer[2] + '0';

str[7] = '.';

str[8] = timer[1] + '0';

str[9] = timer[0] + '0';

str[10] = '\0';

LcdShowStr(2, 1, str);

}

/* 定时器T0配置 */

void ConfigTimer0(unsigned int xms) {

unsigned long tmp;

tmp = (SYS_XTAL * xms) / 1000;

tmp = 65536-tmp + 18;

thr0 = (unsigned char)(tmp >;>; 8) ; tlr0 = (unsigned char)tmp;

TMOD &= 0xF0; //清零T0控制位

TMOD |= 0x01; //定时器方式1

TH0 = thr0;

TL0 = tlr0;

TR0 = 1; //开启timer0

ET0 = 1; //开启T0中断

EA = 1; //开启总中断

}

/* 配置定时器T1 */

void ConfigTimer1(unsigned int xms) {

unsigned long tmp;

tmp = (SYS_XTAL * xms) / 1000;

tmp = 65536 - tmp + 18;

thr1 = (unsigned char)(tmp >;>; 8); tlr1 = (unsigned char)tmp;

TMOD &= 0x0F;

TMOD |= 0x10;

TH1 = thr1;

TL1 = tlr1;

TR1 = 1;

ET1 = 1;

EA = 1;

}

/* 定时器T0中断服务 */

void Timer0_ISP() interrupt 1

{

TH0 = thr0;

TL0 = tlr0;

flag10ms = 1; //定时10ms

}

/* 定时器T1中断服务 */

void Timer1_ISP() interrupt 3

{

TH1 = thr1;

TL1 = tlr1; //定时1ms

KeyScan();

}

/**

************************************************* **********************

* @file Lcd1602.c

* @author xr

* @date 2014年5月7日13:33:17

* @version V1.2.3

* @brief LCD1602液晶底层驱动

************************************************* **********************

*/

#include ;

//LCD1602_IO

sbit LCD1602_RS = P1^0;

sbit LCD1602_RW = P1^1;

sbit LCD1602_EN = P1^5;

#define LCD1602_DB P0

/* 液晶忙碌等待 */

void LCD1602Wait()

{

unsigned char sta;

LCD1602_DB = 0xFF;//总线拉高，检测液晶状态字

LCD1602_RS = 0;

LCD1602_RW = 1;

do

{

LCD1602_EN = 1;

sta = LCD1602_DB;

LCD1602_EN = 0;//避免液晶输出数据

} while (sta & 0x80);//状态字最高位STA7 == 0空闲，1忙碌

}

/* 液晶写命令 */

void LCD1602WriteCmd(unsigned char cmd)

{

LCD1602Wait();

LCD1602_RS = 0;

LCD1602_RW = 0;

LCD1602_EN = 0;

LCD1602_DB = cmd;

LCD1602_EN = 1;

LCD1602_EN = 0;

}

/* 液晶写数据 */

void LCD1602WriteData(unsigned char dat)

{

LCD1602Wait();

LCD1602_RS = 1;

LCD1602_RW = 0;

LCD1602_EN = 0;

LCD1602_DB = dat;

LCD1602_EN = 1;

LCD1602_EN = 0;

}

/* 液晶初始化 */

void InitalLCD1602()

{

LCD1602WriteCmd(0x38);

LCD1602WriteCmd(0x0C);

LCD1602WriteCmd(0x06);

LCD1602WriteCmd(0x01);//清屏

}

/* 写数据到液晶上，字符串str，坐标(x, y)，地址addr */

void LcdShowStr(unsigned char x, unsigned char y, unsigned char * str)

{

unsigned char addr;

if (y == 0)

{

addr = 0x00 + x;

}

else

{

addr = 0x40 + x;

}

LCD1602WriteCmd(addr | 0x80);

while (*str != '\0')

{

LCD1602WriteData(*str++);

}

}

/**

************************************************* **********************

* @file keyboard.c

* @author xr

* @date 2014年5月8日22:11:33 -- 2014年5月9日12:03:49

* @version V1.2.3

* @brief 按键驱动单片机STC89C52RC MCU 晶振11.0592MHZ

************************************************* **********************

*/

#include ;

/* 按键输出输入端口定义 */

sbit KEY_IN1 = P2^4;

sbit KEY_IN2 = P2^5;

sbit KEY_IN3 = P2^6;

sbit KEY_IN4 = P2^7;

sbit KEY_OUT1 = P2^3;

sbit KEY_OUT2 = P2^2;

sbit KEY_OUT3 = P2^1;

sbit KEY_OUT4 = P2^0;

extern unsigned char timer[9]; //分别表示跑表的各个位上的数字

/* 按键当前状态 */

unsigned char volatile keySta[4][4] = {{1, 1, 1, 1},

{1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}};

/* 按键对应标准PC键盘编码 */

const unsigned char code keyCodeMap[4][4] = {

{'1', '2', '3', 0x26}, /* 数字键 1, 2, 3 和向上键 */

{'4', '5', '6', 0x25}, /* 数字键 4, 5, 6 和向左键 */

{'7', '8', '9', 0x28}, /* 数字键 7, 8, 9 和向下键 */

{'0', 0x1B, 0x0D, 0x27} /* 数字键 0 和向右键*/

};

bit stopflag = 0;//跑表走停标志位 0 停止，1运行void KeyAction(unsigned char keycode);

void LcdShowStr(unsigned char x, unsigned char y, unsigned char * str);

/* 按键驱动函数 */

void KeyDriver()

{

/* 上一次按键的备份值 */

static unsigned char keybackup[4][4] = {{1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}, {1, 1, 1, 1}};

for (i = 0; i < 4; i++)

{

for (j = 0; j < 4; j++)

{

if (keySta[i][j] != keybackup[i][j]) //当前按键状态和上一次的按键状态不同

{ //按键有动作

if (keybackup[i][j] != 0) //上一次按键是弹起 {

KeyAction(keyCodeMap[i][j]); //当前按键是想、按下

}

keybackup[i][j] = keySta[i][j]; //备份当前按键值

}

}

}

}

/* 按键扫描函数 */

void KeyScan()

{

static unsigned char keyout = 0;//按键行索引

static unsigned char keybuf[4][4] = {{0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF},

{0xFF, 0xFF, 0xFF, 0xFF}, {0xFF, 0xFF, 0xFF, 0xFF}

};

/* 按键消抖 */

keybuf[keyout][0] = (keybuf[keyout][0] << 1) | KEY_IN1;

keybuf[keyout][1] = (keybuf[keyout][1] << 1) | KEY_IN2;

keybuf[keyout][2] = (keybuf[keyout][2] << 1) | KEY_IN3;

keybuf[keyout][3] = (keybuf[keyout][3] << 1) | KEY_IN4;

/* 更新按键的值 */

for (i = 0; i < 4; i++)

{

if ((keybuf[keyout][i] & 0x1F) == 0x1F)

{

//五次检测按键的值都是1

keySta[keyout][i] = 1;

}

else if ((keybuf[keyout][i] & 0x1F) == 0x00) {

//五次检测的按键值都是0

keySta[keyout][i] = 0;

}

}

/* 按键行索引++ */

keyout++;

keyout &= 0x03;//到4归零

/* 根据按键索引选择行按键进行扫描 */

switch (keyout)

{

case 0: KEY_OUT1 = 0; KEY_OUT4 = 1;//选择第一行按键

case 1: KEY_OUT2 = 0; KEY_OUT1 = 1;

case 2: KEY_OUT3 = 0; KEY_OUT2 = 1;

case 3: KEY_OUT4 = 0; KEY_OUT3 = 1;

default: break;

}

}

/* 按键动作函数 */

void KeyAction(unsigned char keycode)

{

unsigned char i = 0;

if (keycode == 0x1B) //ESC

{

/* 跑表复位 */

stopflag = 0;

for (i = 0; i < 9; i++)

{

timer[i] = 0;

}

LcdShowStr(2, 1, "0000000.00s"); LcdShowStr(10, 0, "reset!");

}

else if (keycode == 0x0D) //回车键跑表走停

{

if (stopflag == 0)

{

stopflag = 1;

LcdShowStr(10, 0, "start!");

}

else

{

stopflag = 0;

LcdShowStr(10, 0, "stop! "); //多写入一个空格

}

}

}