use UART_RTS as GPIO and UART_TX, UART_RX as normal UART in Fanstel BLG840F

[Surya09]

Hello,

I have a use case where I need to use UART_RTS and UART_CTS as GPIO for toggling the led. I also want to use the other two pins UART_TX and UART_RX for handling UART specific function at the same time. I made an overlay file for this. It works when I flashed it on nRF9160dk but in Fanstel BLG840F, it doesn't seem to work at all.

I am certain it is due to the overlay being incorrect for the custom board - Fanstel BLG840F. But not sure how to rectify it!

I also went through driving a GPIO pin directly but it didn't even worked on nRF9160dk board. 

Hoping some help from the community. 

&spi3 {
    status = "disabled";
  };




/{
    gpioCustom{
        compatible = "gpio-keys";
        gpioCus0: gpioCus0{
            gpios = <&gpio0 13 GPIO_ACTIVE_HIGH>;
            label = "Custom";
        };

        gpioCus1: gpioCus1{
            gpios = < &gpio0 26 GPIO_ACTIVE_HIGH >;
            label = "Custom2";
        };
    };

    aliases{
        gpiocus0 = &gpioCus0;
        gpiocus1 = &gpioCus1;
    };
};


&uart0_default {
    group1 {
      psels = <NRF_PSEL_DISCONNECTED(UART_RTS)>,
              <NRF_PSEL(UART_RX, 0, 28)>,
              <NRF_PSEL(UART_TX, 0, 29)>;
    };
    group2 {
      psels = <NRF_PSEL_DISCONNECTED(UART_CTS)>;
    //   bias-pull-up;
    };
  };

  &uart0_sleep {
    group1 {
      psels =
        <NRF_PSEL_DISCONNECTED(UART_RTS)>, <NRF_PSEL_DISCONNECTED(UART_CTS)>;
    //   low-power-enable;
    };
  };

[Hakon]

Hello,

most of the staff is away for vacation, so there will be some delays in response time. Thank you for your patience.

[Kazi Afroza Sultana]

Hello,

''It works when I flashed it on nRF9160dk but in Fanstel BLG840F, it doesn't seem to work at all.'' What type of error you are getting with the Fanstel BLG840F board?

[Surya09]

Kazi Afroza Sultana Thanks for reply. I didn't get any error. It simply doesn't work. I went through the schematics of the Fanstel board and I think 'not sure' as it is not very clear, that both the led is only connected to the nRF52840 and not nRF9160.

[Kazi Afroza Sultana]

Hello Siddarth,

There is a previous case where my colleague explained about the pins of SoC and connection to those with the board pin (both nRF9160 and nRF52840) (+) nRF9160 DK - UART big picture - Nordic Q&A - Nordic DevZone - Nordic DevZone (nordicsemi.com). We do not have details about fanstel board. I would like you to contact with them first. 

[Surya09]

HiKazi Afroza Sultana 

Thanks, I will clarify from the fanstel service team.