RE: Disable HWFC in serial modem application

upswing — Thu, 15 Apr 2021 15:25:19 GMT

I did update the overlay file last night and removed the offending configuration settings. The application compiles but I still have to validate the solution. I will respond with the results later today.

Thank you for your help

RE: Disable HWFC in serial modem application

Simon — Thu, 15 Apr 2021 14:44:18 GMT

To disable flow control, make sure hw-flow-control is not present in the dts node of the uart instance you're using (remove it from nrf9160dk_nrf9160ns.overlay), you can confirm this by checking the file build/zephyr/zephyr.dts. Earlier flow control was configured through Kconfig, but now it is done through dts/overlay-files.

I'm not sure what will happen if you set CONFIG_SLM_DATAMODE_HWFC=n and enable flow control in the device tree, but I can see that it will fail if the opposite is the case: https://github.com/nrfconnect/sdk-nrf/blob/v1.5.1-rc1/applications/serial_lte_modem/src/slm_at_tcp_proxy.c#L862-L865.

Best regards,

Simon