This would let you test devices without opening them, include differences in mechanical actuation time, and give a more accurate test of input devices like keyboards, where each button isn't sampled continuously. Either you need a USB driver that polls the input device more frequently than the USB spec calls for, or you need to implement a high speed device, which is expensive and overkill.Īs for possible improvements: Maybe a mechanical test fixture that uses an accelerometer for the non-usb trigger. Getting a polling interval faster than 1ms is also possible, but impractical. In your testing did you come across any mice that actually used the normally closed switch contact for debouncing? Unless you use the NC contact for debouncing, in which case you don't need any delays. Unfortunately the delay you need to reliably prevent glitches like double clicking on a single click, or releasing during a drag, is long enough that it would interfere with people spamming clicks intentionally. Using single throw switches you have to use delay based debouncing, but press latency can still be low, only releasing the button really needs a long delay. Testing has found that overall input lag (from controller input to display. If the engineer prioritizes latency, and is using double throw switches, steps 4 and 5 combined should take less than 0.1ms. Input lag is the delay between pressing a button and seeing the game react. In the model of switch I tested,Step 3 typically takes about 2ms for a "normal" click, but ranges from about 0.5ms to many tens of milliseconds. user code has received an input event from a userland the OS has processed the data and made it available toġ0. the host computer notifies the OS about new data fromĩ. the device sends data over the wire (0.001 ms),Ĩ. the host computer queries the USB device for new dataħ. after processing the sensor data the chip puts data intoĦ. ![]() This will ensure that wireless latency or interference isnt a factor in. the closed circuit is detected by the device’s controllerĥ. Switch to a wired keyboard and mouse, or controller. delay testing method using the real airplane controller system. the mechanical switch closes an electrical circuit,Ĥ. The transport delay should be measured from control inputs through the interface. the user overcomes activation force and triggers a mechanicalģ. the user first touches the input device,Ģ.
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