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1602整屏移動(dòng)

已有 1126 次閱讀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中斷產(chǎn)生標(biāo)志
unsigned char T0RH = 0;  //T0重載值的高字節(jié)
unsigned char T0RL = 0;  //T0重載值的低字節(jié)

unsigned char code str1[] = "Kingst Studio"; //待顯示的第一行字符串
unsigned char code str2[] = "Let's move..."; //待顯示的第二行字符串，需保持與第一行字符串等長(zhǎng)，較短的行可用空格補(bǔ)齊

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; //移動(dòng)索引
unsigned int  tmrMove = 0; //屏幕移動(dòng)定時(shí)器
unsigned char pdata bufMove1[16 + sizeof(str1) + 16]; //移動(dòng)顯示的緩沖區(qū)
unsigned char pdata bufMove2[16 + sizeof(str1) + 16]; //移動(dòng)顯示的緩沖區(qū)

EA = 1;          //開總中斷
ConfigTimer0(10);  //配置T0定時(shí)10ms
LcdInit();       //初始化液晶

for (i=0; i<16; i++)  //緩沖區(qū)開頭一段填充為空格
{
      bufMove1[ i] = ' ';
      bufMove2[ i] = ' ';
}
for (i=0; i<(sizeof(str1)-1); i++) //待顯示字符串拷貝到緩沖區(qū)中間位置
{
      bufMove1[16+i] = str1[ i];
      bufMove2[16+i] = str2[ i];
}
for (i=(16+sizeof(str1)-1); i<sizeof(bufMove1); i++)  //緩沖區(qū)結(jié)尾一段也填充為空格
{
      bufMove1[ i] = ' ';
      bufMove2[ i] = ' ';
}

while(1)
{
      if (flagT0)
      {
         flagT0 = 0;
         tmrMove += 10;
         if (tmrMove >= 500) //每500ms移動(dòng)一次屏幕
         {
            tmrMove = 0;
            LcdShowStr(0, 0, bufMove1+iMove, 16); //從緩沖區(qū)抽出需顯示的一段字符顯示到液晶上
            LcdShowStr(0, 1, bufMove2+iMove, 16);
            iMove++;                            //移動(dòng)索引遞增，實(shí)現(xiàn)左移
            if (iMove >= (16+sizeof(str1)-1))    //起始位置達(dá)到字符串尾部后即返回從頭開始
            {
                  iMove = 0;
            }
         }
      }
}
}

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

tmp = 11059200 / 12;    //定時(shí)器計(jì)數(shù)頻率
tmp = (tmp * ms) / 1000;  //計(jì)算所需的計(jì)數(shù)值
tmp = 65536 - tmp;       //計(jì)算定時(shí)器重載值
tmp = tmp + 12;          //修正中斷響應(yīng)延時(shí)造成的誤差

T0RH = (unsigned char)(tmp >> 8);  //定時(shí)器重載值拆分為高低字節(jié)
T0RL = (unsigned char)tmp;
TMOD &= 0xF0; //清零T0的控制位
TMOD |= 0x01; //配置T0為模式1
TH0 = T0RH;    //加載T0重載值
TL0 = T0RL;
ET0 = 1;       //使能T0中斷
TR0 = 1;       //啟動(dòng)T0
}
void LcdWaitReady()  //等待液晶準(zhǔn)備好
{
unsigned char sta;

LCD1602_DB = 0xFF;
LCD1602_RS = 0;
LCD1602_RW = 1;
do
{
      LCD1602_E = 1;
      sta = LCD1602_DB; //讀取狀態(tài)字
      LCD1602_E = 0;
} while (sta & 0x80); //bit7等于1表示液晶正忙，重復(fù)檢測(cè)直到其等于0為止
}
void LcdWriteCmd(unsigned char cmd)  //寫入命令函數(shù)
{
LcdWaitReady();
LCD1602_RS = 0;
LCD1602_RW = 0;
LCD1602_E  = 1;
LCD1602_DB = cmd;
LCD1602_E  = 0;
}
void LcdWriteDat(unsigned char dat)  //寫入數(shù)據(jù)函數(shù)
{
LcdWaitReady();
LCD1602_RS = 1;
LCD1602_RW = 0;
LCD1602_E  = 1;
LCD1602_DB = dat;
LCD1602_E  = 0;
}
void LcdInit()  //液晶初始化函數(shù)
{
LcdWriteCmd(0x38);  //16*2顯示，5*7點(diǎn)陣，8位數(shù)據(jù)接口
LcdWriteCmd(0x0C);  //顯示器開，光標(biāo)關(guān)閉
LcdWriteCmd(0x06);  //文字不動(dòng)，地址自動(dòng)+1
LcdWriteCmd(0x01);  //清屏
}
void LcdShowStr(unsigned char x, unsigned char y, const unsigned char *str, unsigned char len)  // 顯示字符串，屏幕起始坐標(biāo)(x,y)，字符串指針str，需顯示長(zhǎng)度len
{
unsigned char addr;

//由輸入的顯示坐標(biāo)計(jì)算顯示RAM的地址
if (y == 0)
{
      addr = 0x00 + x; //第一行字符地址從0x00起始
}
else
{
      addr = 0x40 + x; //第二行字符地址從0x40起始
}

//由起始顯示RAM地址連續(xù)寫入字符串
LcdWriteCmd(addr | 0x80); //寫入起始地址
while (len--)    //連續(xù)寫入字符串?dāng)?shù)據(jù)
{
      LcdWriteDat(*str);
      str++;
}
}
void InterruptTimer0() interrupt 1  //T0中斷服務(wù)函數(shù)
{
TH0 = T0RH;  //定時(shí)器重新加載重載值
TL0 = T0RL;
flagT0 = 1;
}