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samd/modutime: Enable time.time() based on systick_ms().

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Allowing to set a time and retrieve the time.  It is based on systick_ms()
with the precision of the MCU clock.  Unless that is based on a crystal,
the error seen was about 0.5% at room temperature.
This commit is contained in:
robert-hh 2022-06-09 14:33:31 +02:00 committed by Damien George
parent 7da7663902
commit 37449df821
1 changed files with 6 additions and 2 deletions
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8
ports/samd/modutime.c
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@ -27,6 +27,9 @@
#include "py/runtime.h"
#include "extmod/utime_mphal.h"
#include "shared/timeutils/timeutils.h"
#include "mphalport.h"
static uint32_t time_offset = 0;
// localtime([secs])
STATIC mp_obj_t time_localtime(size_t n_args, const mp_obj_t *args) {
@ -34,9 +37,10 @@ STATIC mp_obj_t time_localtime(size_t n_args, const mp_obj_t *args) {
mp_int_t seconds;
if (n_args == 0 || args[0] == mp_const_none) {
// seconds = pyb_rtc_get_us_since_epoch() / 1000 / 1000;
seconds = mp_obj_get_int(args[0]);
seconds = mp_hal_ticks_ms_64() / 1000 + time_offset;
} else {
seconds = mp_obj_get_int(args[0]);
time_offset = seconds - mp_hal_ticks_ms_64() / 1000;
}
timeutils_seconds_since_epoch_to_struct_time(seconds, &tm);
mp_obj_t tuple[8] = {
@ -72,7 +76,7 @@ STATIC MP_DEFINE_CONST_FUN_OBJ_1(time_mktime_obj, time_mktime);
// time()
STATIC mp_obj_t time_time(void) {
mp_raise_NotImplementedError("time");
return mp_obj_new_int_from_uint(mp_hal_ticks_ms_64() / 1000 + time_offset);
}
STATIC MP_DEFINE_CONST_FUN_OBJ_0(time_time_obj, time_time);