/* lab1.c -- Simple C program to run on dSPACE boxes.
             Rich Kozick, 1997 */

 #include "brtenv.h"                  /* basic real-time environment */

#define TS         1.25e-3          /* Sample spacing */
#define TMR0       0                 /* Use timer0 for exec-time trace */

float f, y;                          /* input/output variables */
float exec_time;                     /* execution time */
unsigned long count0;                /* timer0 time count */

/* error flag for CHKERR31 at last dual-port memory location */
int *error = (int *) (DP_MEM_BASE + DP_MEM_SIZE - 1);


/* timer0 interrupt service routine */
isr_t0()
{
  begin_isr_t0(*error);         /* delete if overload check not needed */
  service_trace();              /* call TRACE service routine */
  count0 = count_timer(TMR0);   /* get current time count of timer0 */

  ds1102_ad_start();            /* start DS1102 ADCs */
  f = ds1102_ad(1);             /* read input from ADC channel 1 */

  y = f;			/* output = input */
  
  ds1102_da(1, y);              /* write output to DAC channel 1 */

  exec_time = time_elapsed(TMR0, count0); /* get execution-time */
  end_isr_t0();                 /* delete if overload check not needed */
}


main()
{
  init();                        /* init DAC mode, calibrate ADCs */
  *error = NO_ERROR;             /* initialize overload error flag */
  dp_mem[0].f = 0.0;             /* init 1st dp-mem loc for type float */
  start_isr_t0(TS);              /* initialize sampling clock timer */

  while (*error == NO_ERROR);    /* background process */

  ds1102_da(1, 0.0);             /* on error clear DAC channel 1 */
}