Added get link state function (technically dont need)

Author: bjackson312006

general/include/lan8670.h

@@ -160,4 +160,18 @@ int32_t LAN8670_PLCA_Set_Node_Count(lan8670_t *lan, uint8_t node_count);
  */
 int32_t LAN8670_PLCA_Set_Node_Id(lan8670_t *lan, uint8_t id);
 
+/**
+ * @brief Gets the current link state of the LAN8670.
+ * 
+ * The link state can be one of the following:
+ * - 0: Link is down
+ * - 1: Link is up
+ * 
+ * @param lan Pointer to the lan8670_t instance.
+ * @param state Pointer to a variable to store the link state.
+ * @note For the LAN8670, the link state bit is always 1 (link is up). If this function returns 0, something weird has happened.
+ * @return Status.
+ */
+int32_t LAN8670_Get_Link_State(lan8670_t *lan, uint8_t *state);
+
 // clang-format on

general/src/lan8670.c

@@ -503,4 +503,19 @@ int32_t LAN8670_PLCA_Set_Node_Id(lan8670_t *lan, uint8_t id)
     return mmd_write_register_field(lan, MMD_MISC, MISC_PLCA_CTRL1, 0, 7, id);
 }
 
+int32_t LAN8670_Get_Link_State(lan8670_t *lan, uint8_t *state)
+{   
+    // Read bit 2 of the Basic Status register. (Note: For the LAN8670, this will always be 1.)
+    uint32_t value = 0;
+    int status = read_register_field(lan, REG_BASIC_STATUS, 2, 2, &value);
+    if (status != LAN8670_STATUS_OK) {
+        debug(lan, "ERROR 8000: LAN8670_Get_Link_State() failed to read Basic Status Register (Status: %d)\n", status);
+        return status;
+    }
+
+    // Store the link state in the provided pointer.
+    *state = (uint8_t)value;
+    return LAN8670_STATUS_OK;
+}
+
 // clang-format on