fixes

src/channels.rs

@@ -65,7 +65,8 @@ impl Channels {
 
             let dac_value = {
                 let state = self.channel_state(channel);
-                let pid_output = state.update_pid(instant, data);
+                state.update(instant, data);
+                let pid_output = state.update_pid();
 
                 if state.pid_engaged {
                     Some(pid_output)

src/timer.rs

@@ -42,7 +42,6 @@ pub fn now() -> u32 {
 
 /// block for at least `amount` milliseconds
 pub fn sleep(amount: u32) {
-    use crate::timer::now;
     let start = now();
     while now() - start <= amount {}
 }