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redo time.monotonic() to avoid double precision

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Dan Halbert 2017-10-16 23:48:26 -04:00 committed by Scott Shawcroft
parent 4f4ddf00dc
commit a1409d1432
1 changed files with 3 additions and 1 deletions
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4
shared-bindings/time/__init__.c
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@ -52,7 +52,9 @@
//| :rtype: float
//|
STATIC mp_obj_t time_monotonic(void) {
return mp_obj_new_float(common_hal_time_monotonic() / 1000.0);
uint64_t time64 = common_hal_time_monotonic();
// 4294967296 = 2^32
return mp_obj_new_float(((uint32_t) (time64 >> 32) * 4294967296.0f + (uint32_t) (time64 & 0xffffffff)) / 1000.0f);
}
MP_DEFINE_CONST_FUN_OBJ_0(time_monotonic_obj, time_monotonic);