nrf52833 and external SPI ADC (ADS124S08)

[eb12345]

We are using an external SPI based ADC (TI ADS124s08) with the nrF52833 and NCS. I see there was a driver written for the ADC API for the ADS114s0x which is very similar. I can't seem to find an example on how to setup DTS to use this driver and take ADC readings. Is there any example on how to setup and use the ADS114s0x ?

Thank you in advance.

[Vidar Berg]

Hello,

There do not seem to be any samples or boards utilizing this devicetree binding. I searched through the SDK with the keyword 'ti,ads114s08' to find any boards using this 'compatible', but I only found DT overlays that are used for testing.

Please try the Analog-to-Digital Converter (ADC) sample using an overlay that looks something like this:

/ {
	zephyr,user {
		/* adjust channel number according to pinmux in board.dts */
		io-channels = <&ads114s08 0>;
	};
};

&spi1 {
    compatible = "nordic,nrf-spim";
    ads114s08: ads114s08@0 {
        reg = <0>;
        compatible = "ti,ads114s08";
        #io-channel-cells = <1>;
        drdy-gpios = <&gpio0 3 0>;
        spi-max-frequency = <8000000>;
        ads114s08_gpio: ads114s0x_gpio {
            compatible = "ti,ads114s0x-gpio";
            gpio-controller;
            ngpios = <4>;
            #gpio-cells = <2>;
        };
    };
};

/* Optional: disable built-in SAADC*/
&adc {
    status = "disabled";
};

And add 'CONFIG_ADC_INIT_PRIORITY=80' in the prj.conf to ensure the SPI is initialized before the ADC.

Best regards,

Vidar