LCD1602金沙滩单片机上下滚动

LCD1602金沙滩单片机上下滚动

#include <reg52.h>#define LCD1602_DB  P0
sbit LCD1602_RS = P1^0;
sbit LCD1602_RW = P1^1;
sbit LCD1602_E  = P1^5;bit flag500ms = 0;   //500ms定时标志
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 str0[9][17] = {{"                "},{"0000000000000000"},{"1111111111111111"}, {"2222222222222222"},{"3333333333333333"},{"4444444444444444"}, {"5555555555555555"}, {"                "}
};//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
//unsigned char code str2[] = "Let'";
unsigned char (*p)[17] = str0;void ConfigTimer0(unsigned int ms);
void InitLcd1602();
void LcdShowStr(unsigned char x, unsigned char y,unsigned char *str);void main()
{unsigned char i = 0;unsigned char j = 1;unsigned char pdata bufMove1[17];unsigned char pdata bufMove2[17];EA = 1;            //开总中断ConfigTimer0(10);  //配置T0定时10msInitLcd1602();     //初始化液晶while (1){for(i=0; i<17; i++){bufMove1[i] = p[j][i];bufMove2[i] = p[j-1][i];}if (flag500ms)  //每500ms移动一次屏幕{flag500ms = 0;j++;if (j > 8) {j = 1;}LcdShowStr(0, 0, bufMove1);LcdShowStr(0, 1, bufMove2);}}
}/* 配置并启动T0，ms-T0定时时间 */
void ConfigTimer0(unsigned int ms)
{unsigned long tmp;  //临时变量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;           //补偿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1TH0 = T0RH;     //加载T0重载值TL0 = T0RL;ET0 = 1;        //使能T0中断TR0 = 1;        //启动T0
}
/* 等待液晶准备好 */
void LcdWaitReady()
{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
}
/* 向LCD1602液晶写入一字节命令，cmd-待写入命令值 */
void LcdWriteCmd(unsigned char cmd)
{LcdWaitReady();LCD1602_RS = 0;LCD1602_RW = 0;LCD1602_DB = cmd;LCD1602_E  = 1;LCD1602_E  = 0;
}
/* 向LCD1602液晶写入一字节数据，dat-待写入数据值 */
void LcdWriteDat(unsigned char dat)
{LcdWaitReady();LCD1602_RS = 1;LCD1602_RW = 0;LCD1602_DB = dat;LCD1602_E  = 1;LCD1602_E  = 0;
}
/* 设置显示RAM起始地址，亦即光标位置，(x,y)-对应屏幕上的字符坐标 */
void LcdSetCursor(unsigned char x, unsigned char y)
{unsigned char addr;if (y == 0)  //由输入的屏幕坐标计算显示RAM的地址addr = 0x00 + x;  //第一行字符地址从0x00起始elseaddr = 0x40 + x;  //第二行字符地址从0x40起始LcdWriteCmd(addr | 0x80);  //设置RAM地址
}
/* 在液晶上显示字符串，(x,y)-对应屏幕上的起始坐标，str-字符串指针，len-需显示的字符长度 */
void LcdShowStr(unsigned char x, unsigned char y, unsigned char *str)
{LcdSetCursor(x, y);   //设置起始地址while(*str != '')         //连续写入len个字符数据{LcdWriteDat(*str++);  //先取str指向的数据，然后str自加1}
}
/* 初始化1602液晶 */
void InitLcd1602()
{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+1LcdWriteCmd(0x01);  //清屏
}
/* T0中断服务函数，定时500ms */
void InterruptTimer0() interrupt 1
{static unsigned char tmr500ms = 0;TH0 = T0RH;  //重新加载重载值TL0 = T0RL;tmr500ms++;if (tmr500ms >= 100){tmr500ms = 0;flag500ms = 1;}
}