MSP432E401Y: how time of the day obtained

first_name last_name

Prodigy 30 points

Part Number: MSP432E401Y
Other Parts Discussed in Thread: SYSBIOS

I am developing software for MSP432E401Y.

I would like to know how the time of the day is obtained.

In details, I see the time of the day is generated by function time(), which call function ti_sysbios_hal_secons_get().

The is no source code for ti_sysbios_hal_secons_get(), so I do not understand it works.

I wondered if ti_sysbios_hal_secons_get() executes function SNTP_getTime() which get the time from a time server in the internet.

Thank you very much

Long

over 1 year ago

0 JD Crutchfield over 1 year ago

TI__Mastermind 26420 points

Hey Long,

Take a look at this page: https://software-dl.ti.com/dsps/dsps_public_sw/sdo_sb/targetcontent/bios/sysbios/6_46_01_38/exports/bios_6_46_01_38/docs/cdoc/ti/sysbios/hal/Seconds.html

It looks like the seconds_get() function is just pulling the seconds counter from the RTC peripheral. But for this to work, you must have the RTC setup and first load the time with Seconds_set(). Once the RTC is programmed with the time and is running, it will keep time, and then your application can us Seconds_get() to see the current time.

Hope this helps.

0 first_name last_name over 1 year ago in reply to JD Crutchfield

Prodigy 30 points

Hi JD,

Thank you very much. But I still have questions. My hardware does not have a battery backup. Is it true that after power up, the RTC register counters (which counted by a 32Khz Clock) for the time of the day is reset to 0, then the system must initialize it with the present time, which can be obtained from the Internet by function SNTP_getTime() or by other means. Am I correct?

Thank you

Long

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MSP432E401Y: how time of the day obtained