Change Infallible error type to unit error type

Author: careyk007

nrf52-hal-common/src/gpio.rs

@@ -63,7 +63,6 @@ use crate::target::P0;
 use crate::target::{ P1 };
 
 use crate::hal::digital::v2::{OutputPin, StatefulOutputPin, InputPin};
-use core::convert::Infallible;
 
 impl<MODE> Pin<MODE> {
     /// Convert the pin to be a floating input
@@ -221,7 +220,7 @@ impl<MODE> Pin<MODE> {
 }
 
 impl<MODE> InputPin for Pin<Input<MODE>> {
-    type Error = Infallible;
+    type Error = ();
 
     fn is_high(&self) -> Result<bool, Self::Error> {
         self.is_low().map(|v| !v)
@@ -240,7 +239,7 @@ impl<MODE> InputPin for Pin<Input<MODE>> {
 }
 
 impl<MODE> OutputPin for Pin<Output<MODE>> {
-    type Error = Infallible;
+    type Error = ();
 
     /// Set the output as high
     fn set_high(&mut self) -> Result<(), Self::Error> {