GitHub - crgallac/HapletNativeUSB: I wanted to test the difference between the FTDI USB to Serial converter of the Haplet board programming port vs the Native USB port connected to the ARM M3 for latency. I was being limited to around 185 Hz for my data transmission using the Programming Port. After some research I found this was due to the buffer that the FTDI chip has before flushing data which is set between 8-16 ms. This really destroys high throughput communication for any haptic simulation that is trying to communicate with an external device via the USB port. By using the Native port we directly use the USB standard protocol to transfer data and can achieve rates almost 100 times faster than through the converter. This drastically improves the ability to render stiff and sustained contacts for force feedback haptic applications.

Name		Name	Last commit message	Last commit date
HapletSerial.py		HapletSerial.py
HapletSerialLatencyTest_NativePort.py		HapletSerialLatencyTest_NativePort.py
HapletSerialLatencyTest_NativePort.txt		HapletSerialLatencyTest_NativePort.txt
HapletSerialLatencyTest_ProgrammingPort.py		HapletSerialLatencyTest_ProgrammingPort.py
HapletSerialLatencyTest_ProgrammingPort.txt		HapletSerialLatencyTest_ProgrammingPort.txt

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I wanted to test the difference between the FTDI USB to Serial converter of the Haplet board programming port vs the Native USB port connected to the ARM M3 for latency. I was being limited to around 185 Hz for my data transmission using the Programming Port. After some research I found this was due to the buffer that the FTDI chip has before flus…

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