Does 9160's overlay or dts file not work?

[llly]

I need to use ADC in the project, and then I have configured ADC in overlay. The code is as follows

/ {
	zephyr,user {
		io-channels = <&adc 0>, <&adc 1>, <&adc 2>, <&adc 3>, <&adc 4>, <&adc 5>, <&adc 6>;
	};
};

&adc {
	status = "okay";
	#address-cells = <1>;
    #size-cells = <0>;

    channel@0 {
        reg = <0>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN0>; // TS_ADC
        zephyr,resolution = <12>;
    };
    channel@1 {
        reg = <1>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN1>; // TS_ADC
        zephyr,resolution = <12>;
    };
    channel@2 {
        reg = <2>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN2>; // TS_ADC
        zephyr,resolution = <12>;
    };
    channel@3 {
        reg = <3>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN3>; // TS_ADC
        zephyr,resolution = <12>;
    };
    channel@4 {
        reg = <4>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN4>; // TS_ADC
        zephyr,resolution = <12>;
    };
    channel@5 {
        reg = <5>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN5>; // TS_ADC
        zephyr,resolution = <12>;
    };
    channel@6 {
        reg = <6>;
        zephyr,gain = "ADC_GAIN_1_6";
        zephyr,reference = "ADC_REF_INTERNAL";
        zephyr,acquisition-time = <ADC_ACQ_TIME_DEFAULT>;
        zephyr,input-positive = <NRF_SAADC_AIN6>; // TS_ADC
        zephyr,resolution = <12>;
    };
};

The same code can be measured normally in Zephyr's ADC example, but when it comes to other projects, such as using the application_update example for testing, in this example, ADC channels 1, 2, and 3 will measure voltages of 2.4, 3.0, and 0.9v left and right without connecting any ports.

Then I found out that the problem was with C:\ncs\v2.6.1\zephyr\boards\arm\nrf9160dk_nrf9160\nrf9160dk_nrf9160_common.dtsi, I can solve this problem by setting the status of arduino_serial: &uart1 inside to disabled.

But what's abnormal is that in the ADC example, there is no need to make any modifications to nrf9160dk_nrf9160_common.dtsi, why does overlay not work in the example of app update?

[Naeem Maroof]

Hello,

using the application_update example for testing

can you provide the link to both of these sample you are referring to? For both samples, are you using ncs 2.6.1?

I am not sure, but I can have a look at it. It could be that uart is being used for logging etc.

[llly]

Hello Naeem Maroof

I am using version 2.6.1, and the example I used are C:\ncs\v2.6.1\zephyr\samples\drivers\adc and C:\ncs\v2.6.1\nrf\samples\cellular\http_update\application_update

[Naeem Maroof]

there is no need to make any modifications to nrf9160dk_nrf9160_common.dtsi

_common.dtsi file shows the device tree of the SoC, and we can see that uart1 is enabled

If your application does not need uart1 then you can add the following in the overlay and it will be disabled

&uart1 {
	status = "disabled";
};

and you could confirm it from the compiled dts (in ./build/zephyr/zephyr.dts)

[llly]

Hello Naeem Maroof

There is already code to disable uart1 in C:\ncs\v2.6.1\zephyr\boards\arm\nrf9160dk_nrf9160\nrf9160dk_nrf9160_ns.dts, 

And I have also tried disabling uart1 in overlay

 

But it didn't work, and the ADC values of those channels were still abnormal, I also checked zephyr.dts and it shows that uart1 is indeed disabled