usb: device: gs_usb: make capturing hardware timestamp on sof optional #14
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Make the capturing of hardware timestamps on USB Start of Frame (SoF) events optional and disable it by default. Capturing the hardware timestamp on SoF improves the accuracy of the time synchronization between the USB host and the device (in the range of ~110 to 20 microseconds depending on the board according to my measurements), but comes with a cost of much higher CPU load. This does not affect the relative timestamping of CAN RX/TX frames, only their absolute timestamp as compared to the USB host time. Signed-off-by: Henrik Brix Andersen <[email protected]>
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Make the capturing of hardware timestamps on USB Start of Frame (SoF) events optional and disable it by default.
Capturing the hardware timestamp on SoF improves the accuracy of the time synchronization between the USB host and the device (in the range of ~110 to 20 microseconds depending on the board according to my measurements), but comes with a cost of much higher CPU load.
This does not affect the relative timestamping of CAN RX/TX frames, only their absolute timestamp as compared to the USB host time.