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AP_Stats: fix variable reset time bug

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Use Jan 1st 2016 as epoch time rather than Unix epoch.

PixHawk's 32-bit floats can't store a 32-bit timestamp.
This commit is contained in:
Peter Barker 2016-11-14 10:48:07 +11:00 committed by Randy Mackay
parent e94c23e0a1
commit 37c2c0a822
1 changed files with 6 additions and 2 deletions
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8
libraries/AP_Stats/AP_Stats.cpp
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@ -27,7 +27,7 @@ const AP_Param::GroupInfo AP_Stats::var_info[] = {
// @Param: _RESET
// @DisplayName: Reset time
// @Description: Seconds since epoch since reset (set to 0 to reset)
// @Description: Seconds since January 1st 2016 (Unix epoch+1451606400) since reset (set to 0 to reset statistics)
// @User: Standard
AP_GROUPINFO("_RESET", 3, AP_Stats, params.reset, 1),
@ -89,7 +89,11 @@ void AP_Stats::update()
params.bootcount.set_and_save(params_reset == 0 ? 1 : 0);
params.flttime.set_and_save(0);
params.runtime.set_and_save(0);
params.reset.set_and_save(hal.util->get_system_clock_ms() / 1000);
uint32_t system_clock = hal.util->get_system_clock_ms() / 1000;
// can't store Unix seconds in a 32-bit float. Change the
// time base to Jan 1st 2016:
system_clock -= 1451606400;
params.reset.set_and_save(system_clock);
copy_variables_from_parameters();
}