Recursive subscription function question.

ernestmusseriii · August 2020

Hello, Im a new programmer and I recently inherited a system with an NX4200.

I found this function handling the feedback polling of the audio DSP. It appears to be calling itself over and over again. Is this dangerous for the processor?

define_call 'DSP feedback registration'
{
if(length_string(cDSP_subscriptions[nDSP_param_polled]))
{
wait 10
{
if(VolumeCurrent[nDSP_param_polled])
{
SEND_LEVEL dvTP_Main,Volume_BTN_LVL_UP[nDSP_param_polled],VolumeCurrent[nDSP_param_polled]
}
send_string dvBiamp,"cDSP_subscriptions[nDSP_param_polled]"
nDSP_param_polled = nDSP_param_polled + 1
call 'DSP feedback registration'
}
}
else
{
if(nDSP_param_polled < 101)
{
nDSP_param_polled = nDSP_param_polled + 1
call 'DSP feedback registration'
}
}
}

Thank you!

HARMAN_icraigie · August 2020

Looks like a call that was inherited from way back in the ancient 1990's Axcess programming days. Think it only runs 100 times at pop iterating over itself 1/second - must be called repeatedly from somewhere else in code.

Better (read modern, efficient, portable, scalable, maintainable... ) way would probably be through a timeline.

DEFINE_VARIABLE
volatile long lDspPolling[] = {250}; // 1/4 second interval - muy rapido!

DEFINE_EVENT
someevent[someventTrigger]
{
  timeline_create(DSPFeedbackRegistration, lDspPolling, length_array(lDspPolling), TIMELINE_ABSOLUTE, TIMELINE_REPEAT);
}

timeline_event[DSPFeedbackRegistration]
{
  local_var volatile integer iPolledParameter;

  iPolledParameter++;
  if(iPolledParameter > 100) // Max 100 parameters?
  {  
    timeline_kill(timeline.id);
  }
  if(length_string(cDSP_subscriptions[iPolledParameter ]))
  {
    if(VolumeCurrent[iPolledParameter ])
    {
      SEND_LEVEL dvTP_Main, Volume_BTN_LVL_UP[iPolledParameter ], VolumeCurrent[iPolledParameter ]
    }
    send_string dvBiamp, cDSP_subscriptions[iPolledParameter ] 
  }
}

Recursive subscription function question.

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