Lower input lag can mean the difference between a well-timed reaction for a win or a late response that results in a loss. With fast-paced games like fighting or FPS games, quick reflexes are key.
CONTROLLER INPUT DELAY TEST DRIVER
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. Input lag matters the most for playing video games, either on a console or on a PC. 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? and said test access port controller responsive to said test data input line. Unless you use the NC contact for debouncing, in which case you don't need any delays. 714-724 & 1026US 6,381,718 B1 US 6,381,717 B1 SNOOPY TEST ACCESS. 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. If the engineer prioritizes latency, and is using double throw switches, steps 4 and 5 combined should take less than 0.1ms. 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.
CONTROLLER INPUT DELAY TEST CODE
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. the closed circuit is detected by the device’s controllerĥ. the mechanical switch closes an electrical circuit,Ĥ. the user overcomes activation force and triggers a mechanicalģ. the user first touches the input device,Ģ.