Question

#include <dos.h>
#include <stdio.h>
#include <conio.h>
#define PORT1 0x2E8 /* Port Address Goes Here */
/* Defines Serial Ports Base Address */
/* COM4 0x2E8 */
#define INTVECT 0x0B /* Com Port's IRQ here */
/* (Must also change PIC setting) */
int bufferin = 0;
int bufferout = 0;
char ch;
char buffer[1025];


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 for */
    /* later recovery */
    setvect(INTVECT, PORT1INT); /* Set Interrupt Vector Entry */
    /* COM1 - 0x0C */
    /* COM2 - 0x0B */
    /* COM3 - 0x0C */
    /* COM4 - 0x0B */
    outportb(PORT1 +3 , 0x80); /* SET DLAB ON */
    outportb(PORT1 +0, 0x03); /* Set Baud rate - Divisor Latch Low Byte */
    /* Default 0x03 = 38,400 BPS */
    /* 0x01 = 115,200 BPS */
    /* 0x02 = 56,700 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) & 0xF7)); /* 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) | 0x08)); /* MASK IRQ using PIC */
    /* COM1 (IRQ4) - 0x10 */
    /* COM2 (IRQ3) - 0x08 */
    /* COM3 (IRQ4) - 0x10 */
    /* COM4 (IRQ3) - 0x08 */
    setvect(INTVECT, oldport1isr); /* Restore old interrupt vector */
}

所以我必须使用COM4串口将一些数据从UART发送到UART，我这里有一个小程序作为例子但是无法弄清楚为什么我不能在Visual Studion中编译它（C ++ Win32项目）

有什么想法吗？我还必须使用RQ3实现一个计时器。

Answer 1

无法编译，因为操作系统会管理对硬件的访问。您的示例在第一行说明了它适用的操作系统，而不是Windows。

至于你的第二个主张，你没有。 IRQ3不用于Windows程序中的计时器。 StackOverflow上有很多关于计时器的答案，所以先检查一下。

使用COM4发送整数

1 个答案: