Allow multiple pins to map to one channel

Author: thalesfragoso

src/pwm.rs

@@ -116,6 +116,33 @@ pins_impl!(
     (P4), (PinC4), (C4);
 );
 
+impl<TIM, P1: PinC1<TIM>, P2: PinC1<TIM>> PinC1<TIM> for (P1, P2) {}
+impl<TIM, P1: PinC2<TIM>, P2: PinC2<TIM>> PinC2<TIM> for (P1, P2) {}
+impl<TIM, P1: PinC3<TIM>, P2: PinC3<TIM>> PinC3<TIM> for (P1, P2) {}
+impl<TIM, P1: PinC4<TIM>, P2: PinC4<TIM>> PinC4<TIM> for (P1, P2) {}
+
+impl<TIM, P1: PinC1<TIM>, P2: PinC1<TIM>, P3: PinC1<TIM>> PinC1<TIM> for (P1, P2, P3) {}
+impl<TIM, P1: PinC2<TIM>, P2: PinC2<TIM>, P3: PinC2<TIM>> PinC2<TIM> for (P1, P2, P3) {}
+impl<TIM, P1: PinC3<TIM>, P2: PinC3<TIM>, P3: PinC3<TIM>> PinC3<TIM> for (P1, P2, P3) {}
+impl<TIM, P1: PinC4<TIM>, P2: PinC4<TIM>, P3: PinC4<TIM>> PinC4<TIM> for (P1, P2, P3) {}
+
+impl<TIM, P1: PinC1<TIM>, P2: PinC1<TIM>, P3: PinC1<TIM>, P4: PinC1<TIM>> PinC1<TIM>
+    for (P1, P2, P3, P4)
+{
+}
+impl<TIM, P1: PinC2<TIM>, P2: PinC2<TIM>, P3: PinC2<TIM>, P4: PinC2<TIM>> PinC2<TIM>
+    for (P1, P2, P3, P4)
+{
+}
+impl<TIM, P1: PinC3<TIM>, P2: PinC3<TIM>, P3: PinC3<TIM>, P4: PinC3<TIM>> PinC3<TIM>
+    for (P1, P2, P3, P4)
+{
+}
+impl<TIM, P1: PinC4<TIM>, P2: PinC4<TIM>, P3: PinC4<TIM>, P4: PinC4<TIM>> PinC4<TIM>
+    for (P1, P2, P3, P4)
+{
+}
+
 macro_rules! brk {
     (TIM1, $tim:ident) => {
         $tim.bdtr.modify(|_, w| w.aoe().set_bit());