RS232 in C Programming

ဒီ Program ကေတာ့ C, C++ Programming Language နဲ႔ RS232 (COM) ကို ေရး၊ ဖတ္တဲ့ Program ေလးပါ။ သူ႕ကိုေရးဖို႔ဆိုရင္ bios.h (Header file) လုိပါတယ္။ bios.h အတြက္ download လုပ္ဖို႔လည္းေပးထားပါတယ္။ bioscom(..., ..., ...) ဆိုတဲ့ Command ေလးကိုသံုးၿပီးေရးထားတာပါ။ ဒါေပမယ့္ Display ျပဖို႔အတြက္ေတာ့ LEDs ဒါမွမဟုတ္ LCD display လုိပါလိမ့္မယ္။

#include "bios.h"
#include "conio.h"
#include "dos.h"

#define COM1 0
#define DATA_READY 0x100
#define SETTINGS ( 0x80 | 0x02 | 0x00 | 0x00)

int main(void)
{
int in, out, status;
bioscom(0, SETTINGS, COM1); /*initialize the port*/
cprintf("Data sent to you: ");
while (1)
{
status = bioscom(3, 0, COM1); /*wait until get a data*/
if (status & DATA_READY)
if ((out = bioscom(2, 0, COM1) & 0x7F) != 0) /*input a data*/
putch(out);
if (kbhit())
{
if ((in = getch()) == 27) /* ASCII of Esc*/
break;
bioscom(1, in, COM1); /*output a data*/
}
}
return 0;
}

Download : bios.h