Add touchwheel -> encoder adapter

1 files changed, 44 insertions, 0 deletions

diff --git a/src/drivers/include/relative_wheel.hpp b/src/drivers/include/relative_wheel.hpp
new file mode 100644
index 00000000..3ff64b70
--- /dev/null
+++ b/src/drivers/include/relative_wheel.hpp
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <stdint.h>
+#include <cstdint>
+#include <functional>
+
+#include "esp_err.h"
+#include "result.hpp"
+
+#include "gpio_expander.hpp"
+#include "touchwheel.hpp"
+
+namespace drivers {
+
+class RelativeWheel {
+ public:
+  static auto Create(TouchWheel *touch) -> RelativeWheel* { return new RelativeWheel(touch); }
+
+  explicit RelativeWheel(TouchWheel *touch);
+
+  // Not copyable or movable.
+  RelativeWheel(const RelativeWheel&) = delete;
+  RelativeWheel& operator=(const RelativeWheel&) = delete;
+
+  auto Update() -> void;
+
+  auto is_pressed() -> bool;
+  auto ticks() -> std::int_fast16_t;
+
+ private:
+  TouchWheel *touch_;
+  bool is_pressed_;
+  bool is_first_read_;
+  std::int_fast16_t ticks_;
+  uint8_t last_angle_;
+};
+
+}  // namespace drivers