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Add optional polling interval to reduce CPU usage #113

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Add optional polling interval to reduce CPU usage #113

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19 changes: 19 additions & 0 deletions source/Firmata/UwpFirmata.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -48,11 +48,25 @@ UwpFirmata::UwpFirmata(
_firmata_stream(nullptr),
_connection_ready(ATOMIC_VAR_INIT(false)),
_input_thread_should_exit(ATOMIC_VAR_INIT(false)),
_polling_interval(0),
firmwareVersionMajor(0),
firmwareVersionMinor(0)
{
}

UwpFirmata::UwpFirmata(
uint64_t polling_interval_
) :
_data_buffer(new uint16_t[DATA_BUFFER_SIZE]),
_firmata_lock(_firmutex, std::defer_lock),
_firmata_stream(nullptr),
_connection_ready(ATOMIC_VAR_INIT(false)),
_input_thread_should_exit(ATOMIC_VAR_INIT(false)),
_polling_interval(polling_interval_),
firmwareVersionMajor(0),
firmwareVersionMinor(0)
{
}

//******************************************************************************
//* Destructors
Expand Down Expand Up @@ -556,6 +570,11 @@ UwpFirmata::inputThread(
{
OutputDebugString( e->Message->Begin() );
}

if (_polling_interval)
{
std::this_thread::sleep_for(std::chrono::milliseconds(_polling_interval));
}
}
}

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5 changes: 5 additions & 0 deletions source/Firmata/UwpFirmata.h
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Original file line number Diff line number Diff line change
Expand Up @@ -191,6 +191,10 @@ public ref class UwpFirmata sealed
void
);

UwpFirmata(
uint64_t polling_interval_
);

virtual
~UwpFirmata(
void
Expand Down Expand Up @@ -400,6 +404,7 @@ public ref class UwpFirmata sealed
//input thread & behavior mechanisms
std::thread _input_thread;
std::atomic_bool _input_thread_should_exit;
uint64_t _polling_interval;

String ^
createStringFromMbs(
Expand Down