Import of the watch repository from Pebble

src/fw/drivers/fpc_pinstrap.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdint.h>
+
+//! @file fpc_pinstrap.h
+//!
+//! This file implements an API to read the pinstrap values for an attached FPC (flexible printed
+//! circuit). These values are used for version identification so we can figure out which version
+//! of FPC is connected to our main PCB.
+
+#define FPC_PINSTRAP_NOT_AVAILABLE 0xff
+
+//! @return uint8_t a value between 0 and 8 to represent the pinstrap value. If the pinstrap
+//!                 value isn't valid on this platform, FPC_PINSTRAP_NOT_AVAILABLE is returned.
+uint8_t fpc_pinstrap_get_value(void);