 modify tic.c to chec if interrupts are enabled, rename us_between_ticks to us until_next_tick
 modify tic.c to chec if interrupts are enabled, rename us_between_ticks to us until_next_tick

adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython