nrf9160 with external UART use for send and receive data from terminal using lpuart example not work.

[jaydip1305]

Hello There, 

So basically I need to send and receive and data from to Serial Terminal via FTDI module to nRF9160 DK.
So for this I am using ncs\v1.5.1\nrf\samples\peripheral\lpuart example but its not working.

This are my Connection FTDI Tx --------  Rx P0.10
                                                Rx -------- Tx  P0.11
                                             GND ------ GND

what should I need to change for this.
And fyi i update the modem firmware and AWS-IOT sample also work for me.

Thanks & Regards
       JAYDIP

[Øyvind]

Hello, 

Is there is reason for why you need to use FTDI to communicate to the nRF9160 DK? When connecting the DK with an USB cable to your computer it should provide UART communication, which you can connect to using e.g PuTTY, or LTE Link Monitor found in nRF Connect for Desktop. Please note that the board controller needs to be configured to route correct pins, if you want to use other pins than default configured.

Also, please see the nRF9160DK Getting Started guide and nRF9160 DK Hardware guide. 

Kind regards,
Øyvind

[jaydip1305]

Hello Oyvind,

Thanks for the Quick Response,

So I need an additional UART interface in order to connect an external MCU to the nRF9160.
We are also using the DK-USB for debugging and AT commands.
So in total we need 2 UART interfaces.
One for AT commands and debugging and the second for interfacing with the external MCU.
That is the reason for the additional FTDI to communicate with the nRF9160-DK.

Can you give some input for choosing pin for external UART and also 
if we use the lpuart example what are the changes I need do.

Thanks & Regards
Jaydip

[Øyvind]

Hi Jaydip, 

Please note that the nRF9160 DK has 3 available VCOMS. Where VCOM0/APP1/UART1 and VCOM2/APP2/UART2 is controlled by the board controller (nRF52840), VCOM1 is non-configurable from board controller. 

See this answer from my colleague Sigurd's answer here and my colleague Didrik's answer here.

Kind regards,
Øyvind

[jaydip1305]

Hello Oyvind
Thanks for your response
But I am little bit confused, My Question is I need to communication with external MCU(Like Arduino)
for getting Sensor Data to nRF9160 DK via UART
So as per your Answer I need to use UART1 right? So what are the pin i need to use for that can you suggest me
and also what are the changes I need to do in nrf9160dk_nrf9160ns.overlay this file.

[jaydip1305]

Hi Oyvind,

I just want to get data from external MCU to nRF9160 and also use Serial LTE modem Application and lpuart both sample code with P0.10 and P0.11 but can't success 
follow all the Instruction on readme file

Can you pls help me. I just want to get data from external MCU to nRF9160

Thanks
Jaydip

[Øyvind]

Hi Jaydip, 

My apologies for the late reply. Can you please elaborate on what is failing? Are you getting an error message in your serial output (DK-USB)?

jaydip1305 said:

use Serial LTE modem Application and lpuart both sample code

Have you combined these two? The Serial LTE modem application has its own chapter on how to connect to with an external MCU. The application uses UART2 to connect an external MCU.

Kind regards,
Øyvind