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1602整屏移动

已有 1037 次阅读2017-11-1 19:03

#include <reg52.h>

#define LCD1602_DB P0

sbit LCD1602_RS = P1^0;
sbit LCD1602_RW = P1^1;
sbit LCD1602_E  = P1^5;

bit flagT0 = 0;          //T0中断产生标志
unsigned char T0RH = 0;  //T0重载值的高字节
unsigned char T0RL = 0;  //T0重载值的低字节

unsigned char code str1[] = "Kingst Studio"; //待显示的第一行字符串
unsigned char code str2[] = "Let's move..."; //待显示的第二行字符串，需保持与第一行字符串等长，较短的行可用空格补齐

void ConfigTimer0(unsigned int ms);
void LcdShowStr(unsigned char x, unsigned char y, const unsigned char *str, unsigned char len);
void LcdInit();

void main ()
{
unsigned char i;
unsigned char iMove = 0; //移动索引
unsigned int  tmrMove = 0; //屏幕移动定时器
unsigned char pdata bufMove1[16 + sizeof(str1) + 16]; //移动显示的缓冲区
unsigned char pdata bufMove2[16 + sizeof(str1) + 16]; //移动显示的缓冲区

EA = 1;          //开总中断
ConfigTimer0(10);  //配置T0定时10ms
LcdInit();       //初始化液晶

for (i=0; i<16; i++)  //缓冲区开头一段填充为空格
{
      bufMove1[ i] = ' ';
      bufMove2[ i] = ' ';
}
for (i=0; i<(sizeof(str1)-1); i++) //待显示字符串拷贝到缓冲区中间位置
{
      bufMove1[16+i] = str1[ i];
      bufMove2[16+i] = str2[ i];
}
for (i=(16+sizeof(str1)-1); i<sizeof(bufMove1); i++)  //缓冲区结尾一段也填充为空格
{
      bufMove1[ i] = ' ';
      bufMove2[ i] = ' ';
}

while(1)
{
      if (flagT0)
      {
         flagT0 = 0;
         tmrMove += 10;
         if (tmrMove >= 500) //每500ms移动一次屏幕
         {
            tmrMove = 0;
            LcdShowStr(0, 0, bufMove1+iMove, 16); //从缓冲区抽出需显示的一段字符显示到液晶上
            LcdShowStr(0, 1, bufMove2+iMove, 16);
            iMove++;                            //移动索引递增，实现左移
            if (iMove >= (16+sizeof(str1)-1))    //起始位置达到字符串尾部后即返回从头开始
            {
                  iMove = 0;
            }
         }
      }
}
}

void ConfigTimer0(unsigned int ms)  //T0配置函数
{
unsigned long tmp;

tmp = 11059200 / 12;    //定时器计数频率
tmp = (tmp * ms) / 1000;  //计算所需的计数值
tmp = 65536 - tmp;       //计算定时器重载值
tmp = tmp + 12;          //修正中断响应延时造成的误差

T0RH = (unsigned char)(tmp >> 8);  //定时器重载值拆分为高低字节
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0为模式1
TH0 = T0RH;    //加载T0重载值
TL0 = T0RL;
ET0 = 1;       //使能T0中断
TR0 = 1;       //启动T0
}
void LcdWaitReady()  //等待液晶准备好
{
unsigned char sta;

LCD1602_DB = 0xFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
      LCD1602_E = 1;
      sta = LCD1602_DB; //读取状态字
      LCD1602_E = 0;
} while (sta & 0x80); //bit7等于1表示液晶正忙，重复检测直到其等于0为止
}
void LcdWriteCmd(unsigned char cmd)  //写入命令函数
{
LcdWaitReady();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_E  = 1;
LCD1602_DB = cmd;
LCD1602_E  = 0;
}
void LcdWriteDat(unsigned char dat)  //写入数据函数
{
LcdWaitReady();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_E  = 1;
LCD1602_DB = dat;
LCD1602_E  = 0;
}
void LcdInit()  //液晶初始化函数
{
LcdWriteCmd(0x38);  //16*2显示，5*7点阵，8位数据接口
LcdWriteCmd(0x0C);  //显示器开，光标关闭
LcdWriteCmd(0x06);  //文字不动，地址自动+1
LcdWriteCmd(0x01);  //清屏
}
void LcdShowStr(unsigned char x, unsigned char y, const unsigned char *str, unsigned char len)  // 显示字符串，屏幕起始坐标(x,y)，字符串指针str，需显示长度len
{
unsigned char addr;

//由输入的显示坐标计算显示RAM的地址
if (y == 0)
{
      addr = 0x00 + x; //第一行字符地址从0x00起始
}
else
{
      addr = 0x40 + x; //第二行字符地址从0x40起始
}

//由起始显示RAM地址连续写入字符串
LcdWriteCmd(addr | 0x80); //写入起始地址
while (len--)    //连续写入字符串数据
{
      LcdWriteDat(*str);
      str++;
}
}
void InterruptTimer0() interrupt 1  //T0中断服务函数
{
TH0 = T0RH;  //定时器重新加载重载值
TL0 = T0RL;
flagT0 = 1;
}

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