日志
1602整屏移動
#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中斷產生標志
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，較短的行可用空格補齊
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; //移動索引
unsigned int tmrMove = 0; //屏幕移動定時器
unsigned char pdata bufMove1[16 + sizeof(str1) + 16]; //移動顯示的緩沖區(qū)
unsigned char pdata bufMove2[16 + sizeof(str1) + 16]; //移動顯示的緩沖區(qū)
EA = 1; //開總中斷
ConfigTimer0(10); //配置T0定時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++; //移動索引遞增，實現(xiàn)左移
if (iMove >= (16+sizeof(str1)-1)) //起始位置達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; //定時器計數(shù)頻率
tmp = (tmp * ms) / 1000; //計算所需的計數(shù)值
tmp = 65536 - tmp; //計算定時器重載值
tmp = tmp + 12; //修正中斷響應延時造成的誤差
T0RH = (unsigned char)(tmp >> 8); //定時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T0
}
void LcdWaitReady() //等待液晶準備好
{
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，重復檢測直到其等于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點陣，8位數(shù)據(jù)接口
LcdWriteCmd(0x0C); //顯示器開，光標關閉
LcdWriteCmd(0x06); //文字不動，地址自動+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(x,y)，字符串指針str，需顯示長度len
{
unsigned char addr;
//由輸入的顯示坐標計算顯示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)寫入字符串數(shù)據(jù)
{
LcdWriteDat(*str);
str++;
}
}
void InterruptTimer0() interrupt 1 //T0中斷服務函數(shù)
{
TH0 = T0RH; //定時器重新加載重載值
TL0 = T0RL;
flagT0 = 1;
}
#define LCD1602_DB P0
sbit LCD1602_RS = P1^0;
sbit LCD1602_RW = P1^1;
sbit LCD1602_E = P1^5;
bit flagT0 = 0; //T0中斷產生標志
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，較短的行可用空格補齊
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; //移動索引
unsigned int tmrMove = 0; //屏幕移動定時器
unsigned char pdata bufMove1[16 + sizeof(str1) + 16]; //移動顯示的緩沖區(qū)
unsigned char pdata bufMove2[16 + sizeof(str1) + 16]; //移動顯示的緩沖區(qū)
EA = 1; //開總中斷
ConfigTimer0(10); //配置T0定時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++; //移動索引遞增，實現(xiàn)左移
if (iMove >= (16+sizeof(str1)-1)) //起始位置達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; //定時器計數(shù)頻率
tmp = (tmp * ms) / 1000; //計算所需的計數(shù)值
tmp = 65536 - tmp; //計算定時器重載值
tmp = tmp + 12; //修正中斷響應延時造成的誤差
T0RH = (unsigned char)(tmp >> 8); //定時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T0
}
void LcdWaitReady() //等待液晶準備好
{
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，重復檢測直到其等于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點陣，8位數(shù)據(jù)接口
LcdWriteCmd(0x0C); //顯示器開，光標關閉
LcdWriteCmd(0x06); //文字不動，地址自動+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(x,y)，字符串指針str，需顯示長度len
{
unsigned char addr;
//由輸入的顯示坐標計算顯示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)寫入字符串數(shù)據(jù)
{
LcdWriteDat(*str);
str++;
}
}
void InterruptTimer0() interrupt 1 //T0中斷服務函數(shù)
{
TH0 = T0RH; //定時器重新加載重載值
TL0 = T0RL;
flagT0 = 1;
}
