Wrote tests ensuring correct bit checking and then code to pass it for the reading of input.

src/Relays/Relays.c

@@ -7,8 +7,24 @@
 
 #include "Relays.h"
 
+/*
+static void WaitForRelayConnect(void) {
+  while (!(PORTA.IN & RELAYREADINGPIN)) {
+    ;
+  }
+}
+
+static void WaitForRelayDisconnect(void) {
+  while (PORTA.IN & RELAYREADINGPIN) {
+    ;
+  }
+}
+*/
+
 void Relay_MeasureMakeTime(Relay *relay) {}
 
+void Relay_MeasureBreakTime(Relay *relay) {}
+
 void Relay_Enable(Relay *relay) {
   if (relay->disabled_fpc) {
     return;
@@ -25,6 +41,11 @@ void Relay_Disable(Relay *relay) {
   (*(uint8_t *)relay->output_port) &= ~(1 << (relay->output_pin));
 }
 
-
-
 void Relay_DisableForPowerCycle(Relay *relay) { relay->disabled_fpc = true; }
+
+bool Relay_ReadState(Relay *relay) {
+  if (*(uint8_t *)relay->input_port & (1 << relay->input_pin)) {
+    return true;
+  }
+  return false;
+}

src/Relays/Relays.h

@@ -63,4 +63,10 @@ void Relay_Disable(Relay *relay);
  */
 void Relay_DisableForPowerCycle(Relay *relay);
 
+/**
+ * Reads the relay's input pin on the input port.
+ * @return True for enabled false for disabled relays.
+ */
+bool Relay_ReadState(Relay *relay);
+
 #endif // RELAYS

tests/Relays/test_Relays.cpp

@@ -112,8 +112,15 @@ TEST(test_Relays, ReadStateOfEnabledRelayReadsTrue)
     for(uint8_t i = 0; i <= 7; i++){
         zero_relay_struct(&relay);
         relay.input_pin = i;
-        Relay_Enable(&relay);
+        *(uint8_t *)relay.input_port |= (1<<i);
         CHECK_TRUE(Relay_ReadState(&relay));
     }
 
+    //Ensures that it's accounting for bit number.
+    for(uint8_t i = 0; i <= 7; i++){
+        zero_relay_struct(&relay);
+        relay.input_pin = 7 - i;
+        *(uint8_t *)relay.input_port |= (1<<i);
+        CHECK_FALSE(Relay_ReadState(&relay));
+    }
 }