using kernel timer to wake do something a few times a day

RE: using kernel timer to wake do something a few times a day

rkguy — Sat, 11 May 2019 04:13:28 GMT

Martin Lesundcan you please clarify? Are you suggestion to use PSM both for putting the modem into low power between commination intervals and for putting the arm in low power now until the next sampling event? I thought PSM would not be as battery efficient as a timer because I thought it didn't turn off hardware, other than the modem.

RE: using kernel timer to wake do something a few times a day

Martin Lesund — Fri, 10 May 2019 07:03:11 GMT

Hi Moshe,

Sounds good, then I would recommend looking into the Power Saving Mode (PSM) for the LTE communication.

(ref)

RE: using kernel timer to wake do something a few times a day

MosheSmartAmr — Thu, 09 May 2019 17:33:09 GMT

Hi Martin,

Thanks for your answer.

the tasks are to read sensor data and sent them over LTE.

They do not require high precision

RE: using kernel timer to wake do something a few times a day

Martin Lesund — Thu, 09 May 2019 12:38:37 GMT

Hi Moshe,
What are this "tasks"?
Sending data via LTE or just reading sensor data ?

Here is some extracts from the Timer documentation.

Suggested Uses

Use services based on the system clock for time-based processing that does not require high precision, such as timer objects or Thread Sleeping.
Use services based on the hardware clock for time-based processing that requires higher precision than the system clock can provide, such as Busy Waiting or fine-grained time measurements.

NOTE: The high frequency of the hardware clock, combined with its 32-bit size, means that counter rollover must be taken into account when taking high-precision measurements over an extended period of time.

RE: using kernel timer to wake do something a few times a day

MosheSmartAmr — Tue, 07 May 2019 19:11:20 GMT

Anyone, please 🙂