BLE CONNEXTION CUT REGULARY

RE: BLE CONNEXTION CUT REGULARY

achraf — Tue, 16 Mar 2021 16:22:33 GMT

[quote userid="6462" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary/300205#300205"]What does the documentation for your GSM module tell you?[/quote]

it sim868 a 2A peak current
is the power its the main one , so I could check that , what do you think about the crystal ? or any sdk configuration BLE priority.

RE: BLE CONNEXTION CUT REGULARY

awneil — Tue, 16 Mar 2021 15:44:22 GMT

[quote userid="86148" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary/300203#300203"]It provides 3A output and I think its good enough[/quote]

What does the documentation for your GSM module tell you?

Again, the key thing here is that the current draw has very sharp spikes - the peak could well go over 3A!

So it's not just about being able to give a steady-state 3A - it's about being able to maintain regulation through a spike that hits 3A in a millisecond or less.

You need to get an oscilloscope on your supply rails to check that they're not drooping.

RE: BLE CONNEXTION CUT REGULARY

achraf — Tue, 16 Mar 2021 15:42:19 GMT

I dont think its a reset , it was caused by this long time ago , but now with the watch dog and clean the code it's too far from this , even when its reseting the code should do a lot of init things like i explain in my previous reply it goes : shutdown the module close the connexion reconnect to the server ... so it will be obvious thats its reseting cause i will se that on the ses rtt and even from the server side .thank you for the reply <3

RE: BLE CONNEXTION CUT REGULARY

achraf — Tue, 16 Mar 2021 15:35:46 GMT

[quote userid="6462" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary/299929#299929"]Sounds like you have a power supply issue.[/quote]

I think its the one, weird , even I'v used a DC - DC MP1584 It provides 3A output and I think its good enough.

[quote userid="6462" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary/299929#299929"]Possibly also RF interference.[/quote]

No because I'am using a simcom module, External from the Nrf52832 custom board .

[quote userid="6462" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary/299929#299929"]You think you might be causing a Watchdog reset[/quote]

no its not caused by the watchdog reset, because I made a code that it init the board : close the tcp shutdown the module, reconnect, configuration. so when its reset it will take a lot of time to do this init things and also it will be clear for me thats caused by a reset.

so due to our conversation , is it cause by the power, or what do you think about the crystal because its custom board as you know , or no ?
I appreciate your reply.

RE: BLE CONNEXTION CUT REGULARY

Edvin — Tue, 16 Mar 2021 13:18:22 GMT

As awneil says, it can be a BOR (Brown out reset), but alternatively, it can be the error handler in the application causing a reset. Please try to debug the application on the nRF, and see what it says. As a starting point, you can monitor the log and see whether you see any error messages, or if it looks like the application is resetting.

Best regards,

Edvin

RE: BLE CONNEXTION CUT REGULARY

awneil — Mon, 15 Mar 2021 17:05:31 GMT

[quote userid="86148" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary"]the ble disconnect everytime the sim send the data to the server[/quote]

Sounds like you have a power supply issue.

A GSM radio draws very large peaks of current when transmitting - likely this is causing a "brown out", which upsets the BLE connection.

Possibly also RF interference.

[quote userid="86148" url="~/f/nordic-q-a/72829/ble-connextion-cut-regulary"]I think because I've done a lot of Process[/quote]

You think you might be causing a Watchdog reset?

The RESETREAS register gives the reason for a reset:

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=4_2_0_17_8_2#register.RESETREAS

https://infocenter.nordicsemi.com/topic/com.nordic.infocenter.nrf52832.ps.v1.1/power.html?cp=4_2_0_17_7#unique_832471788