RE: UART on Fanstel BLG840XE

Ana_ — Thu, 17 Jul 2025 20:16:59 GMT

It turns out I wasn't configuring the overlay correctly for the nRF52840. For anyone interested, here is the corrected overlay:

&uart0 {
    compatible = "nordic,nrf-uarte";
	reg = < 0x40002000 0x1000 >;
	interrupts = < 0x2 0x1 >;
	status = "okay";
	current-speed = < 0x1c200 >;
	pinctrl-0 = < &uart0_default >;
	pinctrl-1 = < &uart0_sleep >;
	pinctrl-names = "default", "sleep";
};

&pinctrl {
    uart0_default: uart0_default {
        group1 {
            psels = <0x3>, <0x2000028>;       // TXD = P0.03, RTS = P1.08
        };
        group2 {
            psels = <0x1000005>, <0x3000007>; // RXD = P0.05, CTS = P0.07
            bias-pull-up;
        };
    };
    uart0_sleep: uart0_sleep {
        group1 {
            psels = <0x3>, <0x1000005>, <0x2000028>, <0x3000007>; // TXD, RXD, RTS, CTS
            low-power-enable;
        };
    };
};