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Title Controling digital circuit through computer
Author ashim
Author Email ashimpal007 [at] rediffmail.com
Description this code access the lpt port.here only 4 of the total 8 pins are used but can be modified for full 8 pins.it has a complete GUI with mouse & keyboard interactive control panel.works well in win98, but not in winxp feel free to send suggestions or report bugs.
Category C » Hardware Interaction Through C
Hits 25140
Code Select and Copy the Code
//author: ashim pal // heritage institute of technology,kolkata // applied electronics and instrumentation engg. (3rd yr.) #include<stdio.h> #include<conio.h> #include<dos.h> #include<graphics.h> #include<stdlib.h> #include<bios.h> #define port 0x0378 char ch; void display(int,int,int,int); void dispbutton(int); void click(int,int,int,int); void status(int,int,int,int); void reset(int*,int*,int*,int*); int x,y,button; union REGS i,o; initmouse() { i.x.ax=0; int86(0x33,&i,&o); return(o.x.ax); } void showmouseptr() { i.x.ax=1; int86(0x33,&i,&o); } void getmousepos(int *button, int *x,int *y) { i.x.ax =3; int86(0x33,&i,&o); *button =o.x.bx; *x=o.x.cx; *y=o.x.dx; } void hidemouseptr() { i.x.ax=2; int86(0x33,&i,&o); } void main() {clrscr(); int s1=0,s2=0,s3=0,s4=0; int gdriver=DETECT,gmode,ercode; initgraph(&gdriver,&gmode,""); ercode=graphresult(); if(ercode!=0){printf("error code:%s",grapherrormsg(ercode)); getch();} display(s1,s2,s3,s4); initmouse();showmouseptr(); while(ch!=27) {getmousepos(&button,&x,&y); if(button==1) {if(x>80&&x<180&&y>100&&y<140)ch='1'; if(x>200&&x<300&&y>100&&y<140)ch='2'; if(x>320&&x<420&&y>100&&y<140)ch='3'; if(x>440&&x<540&&y>100&&y<140)ch='4'; if(x>440&&x<540&&y>300&&y<340)ch=32; if(x>80&&x<180&&y>300&&y<340)ch=27; } if(kbhit())ch=getch(); switch(ch) {case '1':{s1=!s1; click(s1,s2,s3,s4); outportb(port,1);delay(500);outport(port,0); ch='0';break; } case '2':{s2=!s2; click(s1,s2,s3,s4); outportb(port,2);delay(500);outport(port,0); ch='0';break; } case '3':{s3=!s3; click(s1,s2,s3,s4); outportb(port,4);delay(500);outport(port,0); ch='0';break; } case '4':{s4=!s4; click(s1,s2,s3,s4); outportb(port,8);delay(500);outport(port,0); ch='0';break; } case 32:{click(s1,s2,s3,s4); reset(&s1,&s2,&s3,&s4); ch='0';break; } case 27: {click(s1,s2,s3,s4); reset(&s1,&s2,&s3,&s4); closegraph();exit(0);} } } } void display(int s1,int s2,int s3,int s4) {setbkcolor(9);setcolor(1); rectangle(5,5,635,475);rectangle(10,10,630,470); dispbutton(1);dispbutton(2);dispbutton(3);dispbutton(4); dispbutton(5);dispbutton(6); status(s1,s2,s3,s4); setcolor(1); outtextxy(100,115,"SWITCH 1"); outtextxy(220,115,"SWITCH 2"); outtextxy(340,115,"SWITCH 3"); outtextxy(460,115,"SWITCH 4"); outtextxy(115,315,"EXIT"); outtextxy(470,315,"RESET"); } void dispbutton(int n) {int x1,y1,x2,y2; if(n==1){x1=80;y1=100;x2=180;y2=140;} if(n==2){x1=200;y1=100;x2=300;y2=140;} if(n==3){x1=320;y1=100;x2=420;y2=140;} if(n==4){x1=440;y1=100;x2=540;y2=140;} if(n==5){x1=80;y1=300;x2=180;y2=340;} if(n==6){x1=440;y1=300;x2=540;y2=340;} setfillstyle(SOLID_FILL,7); bar(x1,y1,x2,y2); setcolor(15); line(x1,y1,x2,y1);line(x1,y1,x1,y2); setcolor(8); line(x2,y1,x2,y2);line(x1,y2,x2,y2); } void click(int s1,int s2,int s3,int s4) {int x1,y1,x2,y2; if(ch=='1'){x1=80;y1=100;x2=180;y2=140;} if(ch=='2'){x1=200;y1=100;x2=300;y2=140;} if(ch=='3'){x1=320;y1=100;x2=420;y2=140;} if(ch=='4'){x1=440;y1=100;x2=540;y2=140;} if(ch==27){x1=80;y1=300;x2=180;y2=340;} if(ch==32){x1=440;y1=300;x2=540;y2=340;} hidemouseptr(); setcolor(15);line(x2,y1,x2,y2);line(x1,y2,x2,y2); setcolor(8);line(x1,y1,x2,y1);line(x1,y1,x1,y2); sound(50);delay(75);nosound(); setcolor(15);line(x1,y1,x2,y1);line(x1,y1,x1,y2); setcolor(8);line(x2,y1,x2,y2);line(x1,y2,x2,y2); showmouseptr(); status(s1,s2,s3,s4); } void status(int s1,int s2,int s3,int s4) {setcolor(4);setfillstyle(SOLID_FILL,4); circle(130,200,10); circle(250,200,10); circle(370,200,10); circle(490,200,10); if(s1==1)floodfill(130,200,4); else {setcolor(0);setfillstyle(SOLID_FILL,0);circle(130,200,10); floodfill(130,200,0); setcolor(4);circle(130,200,10);setfillstyle(SOLID_FILL,4); } if(s2==1)floodfill(250,200,4); else {setcolor(0);setfillstyle(SOLID_FILL,0);circle(250,200,10); floodfill(250,200,0); setcolor(4);circle(250,200,10);setfillstyle(SOLID_FILL,4); } if(s3==1)floodfill(370,200,4); else {setcolor(0);setfillstyle(SOLID_FILL,0);circle(370,200,10); floodfill(370,200,0); setcolor(4);circle(370,200,10);setfillstyle(SOLID_FILL,4); } if(s4==1)floodfill(490,200,4); else {setcolor(0);setfillstyle(SOLID_FILL,0);circle(490,200,10); floodfill(490,200,0); setcolor(4);circle(490,200,10); } } void reset(int *s1,int *s2,int *s3,int *s4) {if(*s1==1) {outportb(port,1);delay(500);outport(port,0);} if(*s2==1) {outportb(port,2);delay(500);outport(port,0);} if(*s3==1) {outportb(port,4);delay(500);outport(port,0);} if(*s4==1) {outportb(port,8);delay(500);outport(port,0);} *s1=0;*s2=0;*s3=0;*s4=0; status(*s1,*s2,*s3,*s4); }

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