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#include "tv80_env.h"

/*

 * This test covers interrupt handling routines.  The actual interrupt code

 * is in assembly, in bintr_crt0.asm.

 *

 * The test generates five interrupts, and clears the interrupt after

 * each one.

 *

 * The isr routine uses the two writes to intr_cntdwn to first clear

 * assertion of the current interrupt and then disable the countdown

 * timer.

 */

unsigned char foo;

volatile unsigned char test_pass;

static unsigned char triggers;

void isr (void)

{

  triggers++;

  if (triggers > 5) {

    test_pass = 1;

    intr_cntdwn = 255;

    intr_cntdwn = 0;

  } else

    intr_cntdwn = 32;

}

int main ()

{

  int i;

  unsigned char check;

  test_pass = 0;

  triggers = 0;

  // start interrupt countdown

  intr_cntdwn = 64;

  for (i=0; i<200; i++)

    check = sim_ctl_port;

  if (test_pass)

    sim_ctl (SC_TEST_PASSED);

  else

    sim_ctl (SC_TEST_FAILED);

  return 0;

}