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应该不是判断忙碌或者不只是判断忙碌，这个语句应该是送了一串命令进去//HD44780 LCD DRIVER
#include <AT89X52.H>
#include <ctype.h>
//LCD Commands
#define LCD_CLS 1 //Clears entire display and sets DDRAM address 0
#define LCD_HOME 2 //Sets DDRAM address 0 in address counter.
#define LCD_SETMODE 4 //Sets cursor move direction and specifies display shift.
#define LCD_SETVISIBLE 8 //Sets entire display (D) on/off,cursor on/off (C), and blinking of cursor position character (B).
#define LCD_SHIFT 16 //Moves cursor and shifts display without changing DDRAM contents.
#define LCD_SETFUNCTION 32 //Sets interface data length (DL), number of display lines (N), and character font (F).
#define LCD_SETCGADDR 64 //Sets CGRAM address.CGRAM data is sent and received after this setting.
#define LCD_SETDDADDR 128 //Sets DDRAM address. DDRAM data is sent and received after this setting.
#define TURE 1
#define FORSE 0
#define TMH 0xf8 //delay timeh 2ms
#define TML 0xCD //delay timel
//------------------------------------------
#define MAX_DISPLAY_CHAR 2
//-----------------------------------------
unsigned char code text[6]="hellow"
static unsigned char data counter,a
void wcchar(unsigned char d) //write a command char
void wdchar(unsigned char i) //write a data char
char wtbusy() //wait busy sign
voidclrscr(void) //clear screen
void initime0(void) //initial time0
void delay(unsigned char i) //delay
//-------------------------------
unsigned char crc8(unsigned char *pData,unsigned char count)
unsigned char pData[]={0x33,0x12,0x34,0x56,0x78,0x33,0x12,0x23,0x45,0x56}
unsigned char data crc
static char outputbuffer[MAX_DISPLAY_CHAR]
char *calc_decascii(char num)
//-------------------------------
void ISR_Timer0(void) interrupt 1
{
TL0=TML
TH0=TMH
counter--
}
void ISR_Int0(void) interrupt 0
{
wdchar(text[a++]) //display "hellow"
if (a>=6)
{a=0wdchar(' ')}
}
//main program display "hellow"
main(void)
{
unsigned char data k
initime0()
wcchar(0x38) //initial lcd
wcchar(LCD_SETVISIBLE+6) //set lcd visible
clrscr() //clear lcd
while(1)
{
crc8(&pData,10)
calc_decascii(crc)
wdchar (outputbuffer[1])
wdchar (outputbuffer[2])
wdchar (' ')
for(k=0k<=6k++)
{
// wdchar(text[k]) //display "hellow"
P1_2=0
delay(55) //delay
P1_2=1
delay(55) //delay
}
}
}
//sub function || display a char
void wdchar(unsigned char i) //write a char
{
unsigned char xdata *j
P1_0=1
P1_1=0
j=0x8000
*j=i
while (wtbusy())
{}
}
void wcchar(unsigned char d) //write a command char
{
unsigned char xdata *j
P1_0=0
P1_1=0
j=0x8000
*j=d
while (wtbusy())
{}
}
char wtbusy() //wait busy sign
{
unsigned char xdata *j
P1_0=0
P1_1=1
j=0x8000
if(*j&0x80)
{
return TURE
}
else
{
return FORSE
}
}
//clear screen
void clrscr()
{
wcchar(LCD_CLS)
}
//initial time0
void initime0()
{
TL0=TML
TH0=TMH
TR0=TURE
IE=0x93 //Enable T0 and Serial Port.
}
//sub function time delay
void delay(unsigned char i)
{
counter=i
while (counter)
{}
}
unsigned char crc8(unsigned char *pData,unsigned char count)
{
//unsigned char crc
crc = 0
while (count-- >0)
{
crc ^= *pData++
}
return crc
}
char *calc_decascii(char num)
// A rather messy function to convert a floating
// point number into an ASCII string.
{ long data temp = num
char data *arrayptr = &outputbuffer[MAX_DISPLAY_CHAR]
long data divisor = 10
long data result
char data remainder,asciival
int data i
// If the result of the calculation is zero
// insert a zero in the buffer and finish.
if (!temp)
{ *arrayptr = 48
goto done
}
// Handle Negative Numbers.
if (temp <0)
{ outputbuffer[0] = '-'
temp -= 2*temp
}
for (i=0 i <sizeof(outputbuffer) i++)
{ remainder = temp % divisor
result = temp / divisor
// If we run off the end of the number insert a space into
// the buffer.
if ((!remainder) &&(!result))
{ *arrayptr = ' '}
// We're in business - store the digit offsetting
// by 48 decimal to account for the ascii value.
else
{ asciival = remainder + 48
*arrayptr = asciival
}
temp /= 10
// Save a place for a negative sign.
if (arrayptr != &outputbuffer[1]) arrayptr--
}
done: return outputbuffer
}
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