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深入淺出VC++串列埠程式設計之DOS的串列埠程式設計

/* Name : Sample Comm's Program - 1024 Byte Buffer - buff1024.c */
/* Written By : Craig Peacock <[email protected]> */
#include <dos.h>
#include <stdio.h>
#include <conio.h>

#define PORT1 0x3F8 /* Port Address Goes Here */
#define INTVECT 0x0C /* Com Port's IRQ here (Must also change PIC setting) */

/* Defines Serial Ports Base Address */
/* COM1 0x3F8 */
/* COM2 0x2F8 */
/* COM3 0x3E8 */
/* COM4 0x2E8 */

int bufferin = 0;
int bufferout = 0;
char ch;
char buffer[1025];

void interrupt(*oldport1isr)();

void interrupt PORT1INT() /* Interrupt Service Routine (ISR) for PORT1 */
{
 int c;
 do
 {
  c = inportb(PORT1 + 5);
  if (c &1)
  {
   buffer[bufferin] = inportb(PORT1);
   bufferin++;
   if (bufferin == 1024)
   {
    bufferin = 0;
   }
  }
 }
 while (c &1);
  outportb(0x20, 0x20);
}

void main(void)
{
 int c;
 outportb(PORT1 + 1, 0); /* Turn off interrupts - Port1 */

 oldport1isr = getvect(INTVECT); /* Save old Interrupt Vector of later
 recovery */

 setvect(INTVECT, PORT1INT); /* Set Interrupt Vector Entry */
 /* COM1 - 0x0C */
 /* COM2 - 0x0B */
 /* COM3 - 0x0C */
 /* COM4 - 0x0B */

 /* PORT 1 - Communication Settings */

 outportb(PORT1 + 3, 0x80); /* SET DLAB ON */
 outportb(PORT1 + 0, 0x0C); /* Set Baud rate - Divisor Latch Low Byte */
 /* Default 0x03 = 38,400 BPS */
 /* 0x01 = 115,200 BPS */
 /* 0x02 = 57,600 BPS */
 /* 0x06 = 19,200 BPS */
 /* 0x0C = 9,600 BPS */
 /* 0x18 = 4,800 BPS */
 /* 0x30 = 2,400 BPS */
 outportb(PORT1 + 1, 0x00); /* Set Baud rate - Divisor Latch High Byte */
 outportb(PORT1 + 3, 0x03); /* 8 Bits, No Parity, 1 Stop Bit */
 outportb(PORT1 + 2, 0xC7); /* FIFO Control Register */
 outportb(PORT1 + 4, 0x0B); /* Turn on DTR, RTS, and OUT2 */

 outportb(0x21, (inportb(0x21) &0xEF)); /* Set Programmable Interrupt Controller */
 /* COM1 (IRQ4) - 0xEF */
 /* COM2 (IRQ3) - 0xF7 */
 /* COM3 (IRQ4) - 0xEF */
 /* COM4 (IRQ3) - 0xF7 */

 outportb(PORT1 + 1, 0x01); /* Interrupt when data received */

 printf("/nSample Comm's Program. Press ESC to quit /n");

 do
 {
  if (bufferin != bufferout)
  {
   ch = buffer[bufferout];
   bufferout++;
   if (bufferout == 1024)
   {
    bufferout = 0;
   }
   printf("%c", ch);
  }

 if (kbhit())
 {
  c = getch();
  outportb(PORT1, c);
 }
}
while (c != 27);

outportb(PORT1 + 1, 0);
/* Turn off interrupts - Port1 */
outportb(0x21, (inportb(0x21) | 0x10)); /* MASK IRQ using PIC */
/* COM1 (IRQ4) - 0x10 */
/* COM2 (IRQ3) - 0x08 */
/* COM3 (IRQ4) - 0x10 */
/* COM4 (IRQ3) - 0x08 */
setvect(INTVECT, oldport1isr); /* Restore old interrupt vector */
}

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