기술공유
 질의응답
 자료실
 마이콤제어
  Home >> 기술공유 > 마이콤제어

Total 38  (32/38)
부록을 포함하여 총 38강좌로 구성되어 있습니다. 책을 읽듯이 앞페에지부터 사용하십시요

제9장 8051 활용- 3강




5. 인터럽트 제어 (메인 회로도를 참조하기 바란다)
/*********************************************************************/
/* Subject : 3 Port LED Driving by Interrupt Code */
/*********************************************************************/

/************************ Declear Preprocessor ***********************/
#include
#define read_CODE(address) (((char *)0x020000)[address])
#define read_XDATA(address) (((char *)0x010000)[address])
#define write_XDATA(address,value) (((char *)0x010000)[address]=value)
#define PA 0x7400 /* PPI 8255 Address Map => ROM - 27c256 */
#define PB 0x7401
#define PC 0x7402
#define CR 0x7403 /* Control Register */
#define CW 0x80 /* Control Word
PA,PB,PC ALL Output Mode */
unsigned char ON_OFF=1; /* switch is a Advice to cpu Interrupt */

/*********************** Function Module ************************/

void delay() /* function module is delay in 0.5 sec */
{
unsigned int i;
for(i=0;i<20000;i++);
}
void init_INT() /* module is Initial interrupt rutine */
{
TCON=0x00; /* INT0 의 입력이 LOW 레벨로 될 때 마다 인터럽트 발생 */
EA=1; /* Interrupt enable */
EX0=1; /* IE 의 D0 비트 */
EX1=1; /* IE 의 D1 비트 */
}
void init_8255() /* module is Initial PPI 8255 */
{
write_XDATA(CR,CW); /* writing CW to CR of PPI */
delay();
}
void a_led() /* Initial reset led display */
{
unsigned int i,A=1;
for(i=0;i<128;i++)
{
P1=A;
delay();
if(A==128)A=1;
else
A=A<<1;
}
}

void b_led(unsigned int nn) /* LED display about Port PA */
{
unsigned int i;
for(i=0;i {
write_XDATA(PA,0xff);
delay();
write_XDATA(PA,0x00);
delay();
}
}

void c_led(unsigned int nn) /* LED DISPLAY about Port PB */
{
unsigned int i;
for(i=0;i {
write_XDATA(PB,0xff);
delay();
write_XDATA(PB,0x00);
delay();
}
}


/********************* Wake up Interrupt *************************/

interrupt[0x03] void EX0_int(void) /* Initial INT0 Interrupt */
{
if(ON_OFF=1) b_led(5); /* 실행후 초기모듈을 수행하라 */
}

interrupt[0x13] void EX1_int(void) /* Initial INT1 Interrupt */
{
if(ON_OFF=1) c_led(5); /* 실행후 초기모듈을 수행하라 */
}

/************************* Main Body *****************************/

void main(void)
{
unsigned int i;
init_INT();
init_8255();
while(1)
a_led();
}

/* End Code */


6. 타이머/카운터 제어
/***************************************************************************/
/* 8051의 타이머/카운터 interrupt를 이용한 LED 순차제어 */
/***************************************************************************/
/***************************** 알고리즘 ************************************/
/* Timer_0 Mode 1 를 이용하여 LED의 점멸주기를 1초로 하여 구동 */
/****************************************************************************/
#include
data int i,count=0;
data int co=0;
void Init_T0(void)
{ TMOD = 0x00; /* timer_0 mode 1설정 */
TR0 = 1; /* timer_0 counting start */
EA = 1; /* interrupt all bit on */
ET0 = 1; /* timer_0 overflow 형성 */ }
/**************************** 펄스계산 *********************************/
/* A=>1머신사이클 : (11059200/12) */
/* B=>내부클록1개당 주기 : 1/(110592/12) => 1/A */
/* C=>1/1000초 주기를 위한 클록수(펄수개수) : 0.001 x 1/(11059200/12) */
/* TH 값 : 8191 - (C-1) = 8191 - (920-1) = 7271 => 0x1c67 를 3좌 Shift */
/* 하면 TH = 0xe3/ TL = 0x07 */
/***********************************************************************/
interrupt[0x0b] void T0_int(void) /* timer_0 interrupt serve rutine 형성 */
{
TH0 = 0xe3; /* counting cycle 결정 */
TL0 = 0x07;
count++;
if(count >= 1000) /* count를 1000번 부르면 1초 => P1구동 */
{
count=0;
P1=0x00;
co++;
if(co >= 10) /* co가 10번 불려지면 10초 => P3구동 */
{
co=0;
P3=0x00;
for(i=0;i<1000;i++);
P3=0xff;
}
}
else
P1=0xff;
}
void main(void)
{
Init_T0( );
while(1){}
}

/***************************************************************************/
/* Timer_0 Mode 1 를 이용하여 LED의 점멸주기를 1초로 하여 구동 */
/* - 그림 9-9 LCD의 구동회로도 참조하시오 - */
/***************************************************************************/
#include
#define LINE1 0x80
#define LINE2 0xbf
#define LCDIR 0x7600
#define LCDDR 0x7601
data unsigned char hour,min,sec,msec;
void Init_T0(void)
{
TMOD = 0x01; /* timer_0 mode 1설정 */
TR0 = 1; /* timer_0 counting start */
EA = 1; /* interrupt all bit on */
ET0 = 1; /* timer_0 interrupt 형성 */
}
interrupt[0x0b] void T0_int(void) /* timer_0 interrupt serve rutine 형성 */
{
TH0 = 0x3c; /* counting cycle 결정 */
TL0 = 0xb0;
msec++;
if(msec >= 20) /* msec를 20번 부르면 1초 */
{
msec=0;
sec++;
}
if(sec >= 60) /* sec를 60번 부르면 1분 */
{
sec=0;
min++;
}
if(min >= 60) /* min을 60번 부르면 1시간 */
{
min=0;
hour++;
}
if(hour >= 24) /* hour를 24번 부르면 1일 */
hour=0;
}

void lcd_delay(int p)
{
int i;
for(i=0;i }
void lcd_busy()
{
lcd_delay(100);
}
void lcd_init()
{
write_XDATA(LCDIR,0x38);lcd_busy();
write_XDATA(LCDIR,0x0e);lcd_busy();
write_XDATA(LCDIR,0x02);lcd_busy();
write_XDATA(LCDIR,0x01);lcd_busy();
}
void lcd_house(int a)
{
write_XDATA(LCDIR,a);
lcd_busy();
}
void lcd_clear()
{
int i;
write_XDATA(LCDIR,0x01);
for(i=0;i<100;i++);
}
void char_out(char s)
{
int i;
write_XDATA(LCDDR,s);
for(i=0;i<100;i++);
}
void string_out(char *str)
{
int i=0;
do{
char_out(str[i]);
}while(str[++i]!=0);
}
void x_y_position(char x,char y)
{
int i;
unsigned char position;
if(y>1)y=1;
if(x>15)x=15;
position=y ? x+0xc0 : x + 0x80;
write_XDATA(LCDIR,position);
for(i=0;i<100;i++);
}
void lcd_num(unsigned char num)
{
unsigned char buf;
buf = num/10;
num %= 10;
char_out(buf + 0x30);
char_out(num + 0x30);
}
void main(void)
{
Init_T0( );
lcd_init();
lcd_clear();
msec=sec=min=hour=0;
while(1)
{
if(msec==0)
{
x_y_position(0,0);
string_out(" H :M :S ");
lcd_house(LINE2 + 1);lcd_num(hour);char_out(':');
lcd_house(LINE2 + 4);lcd_num(min);char_out(':');
lcd_house(LINE2 + 7);lcd_num(sec);char_out(':');
}
}
}
글쓰기 글수정 글삭제

글쓰기

[1]...[PRE][31][32][33][34][35][36][37][38]
   검색어    

Copyright ⓒ All rights reserved