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84 lines
2.1 KiB
84 lines
2.1 KiB
/***********************************************************************/
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/* Fichier ex51.c */
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/* */
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/* BINOME : b17.an2 LIMIN MASSE */
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/* */
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/***********************************************************************/
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#include <dos.h>
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#include <stdio.h>
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#include <conio.h>
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#include <process.h>
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#define LPT1_DATA 0x378
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#define LPT1_STAT (LPT1_DATA + 1)
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#define LPT1_CNT (LPT1_DATA + 2)
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#define ESC 0x1B
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#define CNT59 0x20
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#define IMR59 0x21
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/*Variables globales*/
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/********************/
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void interrupt (*save_int_0b)(); /*Déclaration d'un pointeur pour sauver le vecteur d'interruption*/
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unsigned char imr59_bak;
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unsigned int touche;
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unsigned char data_byte = 0x01;
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unsigned char cnt_byte = 0x01;
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/*************************************************************************/
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/* Fonction ms_dos() Fonction exécutée pour revenir à MS-DOS */
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/*************************************************************************/
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void ms_dos(void)
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{
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/* demasquer l'entree IRQ7 du controleur d'interruption */
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outportb(IMR59, 0x7F & inportb(IMR59));
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exit(0);
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}
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/**************************************/
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/* Programme principal main */
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/**************************************/
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void main(void) {
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/* masquer entree IRQ7 du controleur d'interruption */
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outportb(IMR59, 0x80 | inportb(IMR59));
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do {
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/* Effacer l'ecran */
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clrscr();
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printf("status = 0x%x\n", inportb(LPT1_STAT));
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printf("cnt envoye = 0x%02x\n", cnt_byte);
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outportb(LPT1_CNT, cnt_byte);
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printf("cnt lu = 0x%02x\n", inportb(LPT1_CNT));
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printf("data envoye = 0x%02x\n", data_byte);
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outportb(LPT1_DATA, data_byte);
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printf("data lu = 0x%02x\n", inportb(LPT1_DATA));
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data_byte <<= 1;
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if (!data_byte)
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data_byte = 0x01;
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cnt_byte <<= 1;
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if (!(cnt_byte & 0x0F))
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cnt_byte = 0x01;
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printf("\nPressez ESC pour quitter, une autre touche pour continuer\n");
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} while ((touche = getch()) != ESC);
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ms_dos();
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}
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