关于单片机液晶1602的程序片段问题
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
void clrscr(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=0;wdchar(' ');}
}
//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=0;k<=6;k++)
{
// 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;
}