Lower the tick rate from 10kHz to 1kHz (otherwise all the extra interrupts reduce the achievable scan rate). Enable the WAIT_US_TIMER using GPT TIM3. Observed scan rate on the K320 is increased from 625Hz to 2090-2120Hz.
Co-authored-by: Drashna Jaelre <drashna@live.com> Co-authored-by: Don Kjer <don.kjer@gmail.com>