Are all time.tick_xxx() functions bound to 30 bits? #178

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1. microbit-carlos commented on Apr 3, 2024

   

   microbit-carlos

   on Apr 3, 2024

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   Ah, looking at the upstream code it's more clear that this is the case:
   https://github.com/micropython/micropython/blob/v1.22.0/extmod/modtime.c#L151-L164

   STATIC mp_obj_t time_ticks_ms(void) {
       return MP_OBJ_NEW_SMALL_INT(mp_hal_ticks_ms() & (MICROPY_PY_TIME_TICKS_PERIOD - 1));
   }
   MP_DEFINE_CONST_FUN_OBJ_0(mp_time_ticks_ms_obj, time_ticks_ms);
   
   STATIC mp_obj_t time_ticks_us(void) {
       return MP_OBJ_NEW_SMALL_INT(mp_hal_ticks_us() & (MICROPY_PY_TIME_TICKS_PERIOD - 1));
   }
   MP_DEFINE_CONST_FUN_OBJ_0(mp_time_ticks_us_obj, time_ticks_us);
   
   STATIC mp_obj_t time_ticks_cpu(void) {
       return MP_OBJ_NEW_SMALL_INT(mp_hal_ticks_cpu() & (MICROPY_PY_TIME_TICKS_PERIOD - 1));
   }
   MP_DEFINE_CONST_FUN_OBJ_0(mp_time_ticks_cpu_obj, time_ticks_cpu);

   And https://github.com/bbcmicrobit/micropython/blob/v1.1.1/source/extmod/utime_mphal.c#L67-L80.

   We can update the micro:bit MicroPython docs for V1 and V2 to reflect this.
2. microbit-carlos

   added

   documentationImprovements or additions to documentationImprovements or additions to documentation

   on Apr 3, 2024
3. dpgeorge commented on Apr 8, 2024

   

   dpgeorge

   on Apr 8, 2024

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   The wrap around behaviour is documented in the MicroPython docs: https://docs.micropython.org/en/latest/library/time.html#time.ticks_ms
4. microbit-carlos

   added this to the 2.2.0-beta.2 milestone on Sep 3, 2024