Subversion Repositories eco32

/*

 * main.c -- the main program

 */

#include "common.h"

#include "lib.h"

#include "start.h"

int charAvail = 0;

char charRead;

/**************************************************************/

/*

 * Interrupt and exception messages which will be shown if

 * the corresponding interrupt or exception is not handled.

 */

char *exceptionCause[32] = {

  /* 00 */  "terminal 0 transmitter interrupt",

  /* 01 */  "terminal 0 receiver interrupt",

  /* 02 */  "terminal 1 transmitter interrupt",

  /* 03 */  "terminal 1 receiver interrupt",

  /* 04 */  "keyboard interrupt",

  /* 05 */  "unknown interrupt 5",

  /* 06 */  "unknown interrupt 6",

  /* 07 */  "unknown interrupt 7",

  /* 08 */  "disk interrupt",

  /* 09 */  "unknown interrupt 9",

  /* 10 */  "unknown interrupt 10",

  /* 11 */  "unknown interrupt 11",

  /* 12 */  "unknown interrupt 12",

  /* 13 */  "unknown interrupt 13",

  /* 14 */  "timer interrupt",

  /* 15 */  "unknown interrupt 15",

  /* 16 */  "bus timeout exception",

  /* 17 */  "illegal instruction exception",

  /* 18 */  "privileged instruction exception",

  /* 19 */  "divide instruction exception",

  /* 20 */  "trap instruction exception",

  /* 21 */  "TLB miss exception",

  /* 22 */  "TLB write exception",

  /* 23 */  "TLB invalid exception",

  /* 24 */  "illegal address exception",

  /* 25 */  "privileged address exception",

  /* 26 */  "unknown exception 26",

  /* 27 */  "unknown exception 27",

  /* 28 */  "unknown exception 28",

  /* 29 */  "unknown exception 29",

  /* 30 */  "unknown exception 30",

  /* 31 */  "unknown exception 31"

};

/*

 * This is the default interrupt service routine.

 * It simply panics with a message that tells the cause.

 */

void defaultISR(int irq, InterruptContext *icp) {

  printf("**** %s ****\n", exceptionCause[irq]);

  while (1) ;

}

/*

 * Initialize all interrupts and exceptions to the default ISR.

 * Enable interrupts.

 */

void initInterrupts(void) {

  int i;

  for (i = 0; i < 32; i++) {

    setISR(i, defaultISR);

  }

  enable();

}

/**************************************************************/

void kbdISR(int irq, InterruptContext *icp) {

  unsigned int *p;

  p = (unsigned int *) 0xF0200000;

  charRead = *(p + 1);

  charAvail = 1;

}

void kbdEnable(void) {

  unsigned int *p;

  p = (unsigned int *) 0xF0200000;

  *p = 2;

}

int main(void) {

  unsigned char c;

  int n;

  printf("Keyboard Test:\n");

  printf("initializing interrupts...\n");

  initInterrupts();

  printf("setting kbd ISR...\n");

  setISR(4, kbdISR);

  printf("enabling kbd interrupt mask bit...\n");

  setMask(getMask() | (1 << 4));

  printf("enabling interrupts in kbd controller...\n");

  kbdEnable();

  n = 0;

  while (1) {

    while (charAvail == 0) ;

    disable();

    c = charRead;

    charAvail = 0;

    enable();

    printf("%02X ", c);

    if (++n == 24) {

      n = 0;

      printf("\n");

    }

  }

  return 0;

}