How i can get the max_length oh the channel from the dts file

[jyoti yadav]

hi 

1.  #define ADC_NUM_CHANNELS DT_PROP_LEN(DT_PATH(zephyr_user), io_channels)  this is example code from v1.8.0\zephyr\samples\drivers\dac\src\main.c but this is not working with the nordic board 

2. How can i configure the channel using this

3. I want the take the max channel length from the dts file how i can configure this above example code please any one help me with this   

[Øivind]

Hi,

Did you mean to say the adc sample? That's the only place I can find ADC_NUM_CHANNELS.

Have you added an overlay file for your board? If you have, can I see the contents of the overlay file?

[jyoti yadav]

I want to take the channel count from the overlay and according to that i want to configure the no of channels .

How can i archive this?    

[Øivind]

To get the sample to work, your overlay should look something like this:

/ {
	zephyr,user {
		io-channels = <&adc 1>;
	};
};

By default, the sample will use the number after "&adc" to know which analog input to use. So 1 would mean that it uses AIN1. You can look up which pin this correlates to in the product specification for the board.