[embeddedpp] Create a gpio interface

Author: engdoreis

lib/embeddedpp/CMakeLists.txt

@@ -10,6 +10,7 @@ target_sources(embeddedpp
         BASE_DIRS ${CMAKE_CURRENT_SOURCE_DIR}
         FILES
             spi.hh
+            gpio.hh
             helpers.hh
 )
 

lib/embeddedpp/gpio.hh

@@ -0,0 +1,19 @@
+// Copyright lowRISC contributors.
+// Licensed under the Apache License, Version 2.0, see LICENSE for details.
+// SPDX-License-Identifier: Apache-2.0
+
+#pragma once
+
+#include <concepts>
+#include <cstdint>
+#include "helpers.hh"
+
+namespace embeddedpp {
+
+template <typename T>
+concept Gpio = requires(T t, uint8_t pin, bool value) {
+  { t.set_pin(pin, value) } -> std::same_as<Status>;
+  { t.get_pin(pin) } -> std::same_as<Result<bool>>;
+};
+
+}  // namespace embeddedpp