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Adjusted current time with elapsed ticks #193
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atigyi
reviewed
Mar 6, 2018
| void xi_bsp_time_init() | ||
| { | ||
| xi_bsp_time_sntp_init( NULL ); | ||
| if (xi_bsp_time_sntp_getseconds_posix() != 0) | ||
| { |
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Why is this condition necessary?
If the getseconds equals zero, then isn't it a failure? Failure during getting the time from SNTP server? Also means the HAL_GetTick() returns zero, right?
If time isn't received from SNTP service the connection to broker should fail anyway. So, I would stick to a simple:
ticks_at_start = HAL_GetTick(); without a condition.
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Good catch! |
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The fix is calculating in the elapsed ticks at the init time to remove the problematic offset.
Details:
The HAL tick counter is reflecting the elapsed time since the startup of the MCU. When the xi_bsp_time_init() is called the tick counter is already containing the elapsed time (it is non-zero). This distorts the result of the xi_bsp_time_getcurrenttime_seconds() function as a problematic offset will appear. This is even more significant in case the xi_bsp_time_init() is called repeatedly or with a delay.