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rusttype-conversionraspberry-pi-picorp2040
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Reputation: 142

How to make rp2040 DynPin usable for Adc with OnesShot read

I am trying to convert from a type erased type to a value type. I have the following struct that accepts DynPin , which is the type erased type of a rp2040 gpio pin.

pub struct PhProbe{
  analog_read_pin: DynPin,
}

Now using the rp2040 analog to digital converter with OneShot I want to use this pin in the read function (ignore return value). But the read function of the ADC only accepts pins that implement Channel<ADC> which is done using a macro, which as you can see is only implemented for the specific gpios 26-29.

pub fn read(&mut self, adc: Adc) {
      let reading: u16 = adc.read(&mut <DynPin as Into<FloatingInput>>::into(self.analog_read_pin)).unwrap();
    }

The pin is created using the into_floating_input() function and handed to the PhProbe::new() function by making a DynPin using into().

let ph_pin = pins.gpio26.into_floating_input();
let ph_meter = PhProbe::new(ph_pin.into());

I was trying to make a analog input pin (FloatingInput) out of the DynPin, but this doesn't satisfy the bounds Channel<Adc> of OneShot. Is there a a way to use any of the gpio26-29 pins with this or do I need to specify Gpio26 for this?

Upvotes: 3

Views: 170

Answers (0)

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