NRF9160 DK Serial LTE Modem not answering to AT commands

RE: NRF9160 DK Serial LTE Modem not answering to AT commands

RobertT — Mon, 11 Jan 2021 15:23:26 GMT

Hello, Heidi!

Sorry for the late reply. I just had to focus on some other part of the project. Yes, the nRF9160 DK is set to 3V. The electrical connections are set as you described.

I will only close the ticket now since I will need to come back sometime in the near future on this and do not want to take more of your time.

Will be back soon.

All the best,

Robert.

RE: NRF9160 DK Serial LTE Modem not answering to AT commands

Heidi — Mon, 11 Jan 2021 15:17:03 GMT

Okay.

So the nRF9160 isn't receiving them for some reason. It's trivial, but have you double-checked the connection lines?

nRF52 Series DK	nRF9160 DK
UART TX P0.6	UART RX P0.11
UART RX P0.8	UART TX P0.10
UART CTS P0.7	UART RTS P0.12
UART RTS P0.5	UART CTS P0.13
GPIO OUT P0.27	GPIO IN P0.31

Have you set the GPIO output level on the nRF9160 DK to 3V (SW11)?

RE: NRF9160 DK Serial LTE Modem not answering to AT commands

RobertT — Wed, 23 Dec 2020 12:01:52 GMT

Hello, Heidi!

- > both of them are set, CONFIG_SLM_GPIO_WAKEUP and CONFIG_SLM_CONNECT_UART_2.

- > yes, pushing the buttons.

- > I see bits sent on the osci .

All the best,

Robert.

RE: NRF9160 DK Serial LTE Modem not answering to AT commands

Heidi — Tue, 22 Dec 2020 15:21:19 GMT

Hi!

Are you using the nRF52840 DK?

Have you set both CONFIG_SLM_GPIO_WAKEUP and CONFIG_SLM_CONNECT_UART_2 in the application flashed to the nRF9160 DK?

Are you pushing the buttons to send the AT command or have you modified the sample to send them? If it's the latter, could you provide me with the modifications so I can take a look?

Lastly, do you have access to an oscilloscope or logic analyzer to check whether something is being sent over the lines between the nRF52840 DK and the nRF9160 DK?

Best regards,

Heidi

RE: NRF9160 DK Serial LTE Modem not answering to AT commands

RobertT — Tue, 15 Dec 2020 02:22:06 GMT

The RTT for NRF52840 starts with an error :00> <error> app: NRF_SERIAL_EVENT_DRV_ERR(0x0000000C) and now I noticed memory errors after I build the code with SEGGER for the NRF9160, picture bellow: