gpio.c

DOS下开发网络程序的SOCK库,有示例程序,包括FTP

/*

DM&P Mity-Mite Demo Program.
Copyright (C) 2002 by DM&P.

Those functions are about GPIO.

*/

#include "gpio.h"
#include <conio.h>
#include <dos.h>
#include <time.h>

/* Use BIOS tick to get delay time */
void Delay(int nTime)
{
  clock_t clk = clock() + nTime/55+1;
  while(clock()<clk);
}

void Beep2()
{
  sound(2500);
  delay(100);
  sound(3500);
  delay(100);
  nosound();
}

void Beep3()
{
  sound(3000);
  Delay(200);
  sound(2000);
  Delay(200);
  sound(3000);
  Delay(200);
  nosound();
}

/* We use bit 12 of GPIO to lighr LED */
void SetLed(int n)
{
  unsigned char c;
  /* Unlock config register */
  outp(0x22,0x13);
  outp(0x23,0xc5);

  /* Set GPIO bit 12 output */
  outp(0x22,0x4f);
  c = inp(0x23);
  outp(0x22,0x4f);
  outp(0x23,0x10|c);

  /* Write output */
  outp(0x22,0x4d);
  outp(0x23,n?0x00:0x10);
}

int GetKey()
{
  unsigned char c;
  /* Unlock config register */
  outp(0x22,0x13);
  outp(0x23,0xc5);

  /* Set GPIO 15-13 to input */
  outp(0x22,0x4f);
  c = inp(0x23) & 0xf0;
  outp(0x22,0x4f);
  outp(0x23,0x0f|c);

  /* Read GPIO 15-8 */
  outp(0x22,0x4c);
  c = inp(0x23);

  /* de-bounce */
  if(~c&0xe0)
  {
    int i;
    char x = c;
    for(i=0;i<3;i++)
      if(inp(0x23)!=x)
        x = inp(0x23), i=0;
    sound(4000);
    delay(55);
    nosound();
    delay(200);
  }

  /* Return key code */
  if(~c&0x20)
    return KEY_LEFT;
  if(~c&0x40)
    return KEY_RIGHT;
  if(~c&0x80)
    return KEY_ENTER;
  return KEY_NULL;
}

/* Dump buffer and read left/right to scroll LCD */
void DumpBuf(char pp[][DUMP_LINE_SIZE],int nMaxLine)
{
  int i;
  int nIdx = 0;
  int k;
  int nEnd;
  GrLcd_ClearScreen();
  while(1)
  {
    nEnd = (nIdx+4)>=nMaxLine ? nMaxLine : nIdx+4;
    if(nIdx!=nEnd)
      GrLcd_ClearScreen();
    for(i=nIdx;i<nEnd;i++)
      GrLcd_printf(0,8*(i-nIdx),"%s",pp[i]);
    while((k=GetKey())==KEY_NULL);
    if(k==KEY_ENTER)
      break;
    if(k==KEY_LEFT)
      if(nIdx>=1)
        nIdx--;
    if(k==KEY_RIGHT)
      if((nIdx+4)<nMaxLine)
        nIdx++;
  }
  GrLcd_ClearScreen();
}