Setting nRF9160 Hardware Flow Control(HWFC) for nRF9160 SLM application

[Shivek]

Hi,

I am trying to communicate with nRF9160, which is flashed with Nordic SLM application.

I am not able to set the HWFC with UART0/UART2 using menuconfig in Segger Embedded Studio (v5.50) Nordic Edition.

I have tried with the following:

1. menuconfig

2. prj.config

Here are the snapshots of all of them:

The following is a snapshot from prj.conf file:

I am able to switch between UART0/UART2 by changing the custom board dts file. But not able to enable HWFC with UART.

I tried putting nRF9160 in debug mode and look into the UART register named CONFIG as per the product specification document of nRF9160 as per shown in the following pic:

But the bit never got set. I have attached a screenshot from debugger.

On this link it says by default the HWFC is enabled with UART2 used for communication. 

 Can you please help me in setting up the UART with HWFC?

Thanking in advance.

Regards,

Shivek

[Håkon Alseth]

Hi Shivek,

 

To configure the uart peripheral to use HWFC, you need to set this in the device tree overlay, as shown here:

https://github.com/nrfconnect/sdk-nrf/blob/v1.7.1/applications/serial_lte_modem/nrf9160dk_nrf9160_ns.overlay

 

This should match the board you're configuring with. If you are configuring with a custom board, try copying/renaming the above file to match your board, then re-import the project (remember to clean the build folder)

 

Kind regards,

Håkon