Cant build zephyr battery example

[BehicMV]

Hi,

I was trying to build the zephyr battery example Battery Voltage Measurement — Zephyr Project Documentation (nordicsemi.com) . But when I was building the project, it raises an error like this:

note: in expansion of macro 'DEVICE_DT_GET'

78 | .adc = DEVICE_DT_GET(DT_IO_CHANNELS_CTLR(ZEPHYR_USER)),

What should I do? Or is there any way to read/calculate/measure the input voltage to a pin?

[runsiv]

Hi, 

Did you add the overlay file as described in https://developer.nordicsemi.com/nRF_Connect_SDK/doc/2.2.0/zephyr/samples/boards/nrf/battery/README.html#building-and-running ? My project builds if I add it. 

Regards

Runar

[BehicMV]

I built the code in VS Code.

I simply created a new application and searched the "battery". Then I configurated the build for "nRF52840dk" and built the app. Was that wrong? 

Thanks.

[runsiv]

Hi, 

Unfortunately yes, as the link you posted the dts of the nrf52840 does not contain the vbatt and therefor you have to do as the link you posted describes. 

[BehicMV]

I tried to build relative to instructions, but unfortunately I have no such "west" command. 

So, I have an alternative code that measures the voltage. But this code also does not work (I couldnt build). What should I do?

#include <stdio.h>
#include <nrf.h>
#include <nrfx_saadc.h>
#include <nrfx.h>
int main(void)
{
    // Configure the ADC to use the 0.13 pin as the input channel
    NRF_SAADC->CH[0].PSELP = 13; // Pin 0.13
    NRF_SAADC->CH[0].PSELN = 0xFFFFFFFF; // Not using negative input

    // Configure the ADC's reference voltage
    NRF_SAADC->REF = SAADC_REF_INTERNAL;

    // Start the ADC conversion
    NRF_SAADC->TASKS_START = 1;

    // Wait for the ADC conversion to complete
    while (NRF_SAADC->EVENTS_END == 0) {}

    // Read the ADC result
    uint16_t result = NRF_SAADC->RESULT.RESULT;

    // Convert the ADC result to a voltage value
    float voltage = (float)result / (1 << 12) * 1.2;

    // Convert the voltage value to a battery level
    float battery_level = voltage / 4.0 * 100.0;

    // Print the battery level to the console
    printf("Battery level: %.2f%%\n", battery_level);

    return 0;
}