Serial LTE Modem app NCS main - INDICATE

user7170 over 4 years ago

NCS main, nRF9160 DK, PPK2

git log -n 1 --oneline
4f916da03 (HEAD -> main, origin/main, origin/HEAD) west.yml: rebase OSS trees

SLM prj.conf changes:

CONFIG_SLM_START_SLEEP=y

CONFIG_SLM_WAKEUP_PIN=6

CONFIG_SLM_INDICATE_PIN=2

CONFIG_NRF_MODEM_LIB_TRACE_ENABLED=y

INDICATE pin is active High and require pull-down.

It would be nice to consolidate SLM signals (RESET, TX, RX, WAKEUP, INDICATE) with active level Low and outputs drived by open collector (pull-ups on signal receiver side).

I.E.
Outputs TX and INDICATE driven by open collector with expected pull-up in receiver (other side).

Inputs RESET, WAKEUP, RX terminated by pull-ups in nRF9160 with active Low.

Change quiet state of INDICATE to high impedance and active state of INDICATE to Low please.

Thank you.

Regards,
Michal

0 user73166 over 4 years ago

Hello,

I'm not sure how to interpret your question. Is it by any chance related to this issue?
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0 user7170 over 4 years ago in reply to user73166

Hello,

signal active levels is not related to glitches any way.

Active level of INDICATE is High now, but active level of all other SLM signals (RX, TX, RESET, WAKEUP) is Low.

So implementation of INDICATE is not consitent with implementation of other SLM signals and it would be good practice to make it consistent.

Can you change active level of INDICATE to Low driven by open collector (i.e expecting pull-up at receiver side) please ?

Thank you.

Regards,
Michal
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