Give time for dac value to settle when calibrating

src/channels.rs

@@ -21,6 +21,7 @@ use crate::{
     pins,
     steinhart_hart,
     hw_rev,
+    timer,
 };
 
 pub const CHANNELS: usize = 2;
@@ -275,6 +276,7 @@ impl<'a> Channels<'a> {
         let mut best_error = ElectricPotential::new::<volt>(100.0);
 
         for step in (0..18).rev() {
+            timer::sleep(5);
             let mut prev_value = start_value;
             for value in (start_value..=ad5680::MAX_VALUE).step_by(1 << step) {
                 match channel {