Add touchwheel -> encoder adapter

24 files changed, 463 insertions, 112 deletions

diff --git a/src/app_console/app_console.cpp b/src/app_console/app_console.cpp
index 23e8875e..39d6d8e0 100644
--- a/src/app_console/app_console.cpp
+++ b/src/app_console/app_console.cpp
@@ -14,9 +14,12 @@
 #include <iostream>
 #include <string>
 
+#include "audio_events.hpp"
+#include "audio_fsm.hpp"
 #include "database.hpp"
 #include "esp_console.h"
 #include "esp_log.h"
+#include "event_queue.hpp"
 
 namespace console {
 
@@ -66,7 +69,7 @@ void RegisterListDir() {
   esp_console_cmd_register(&cmd);
 }
 
-/*
+  //sInstance->playback_->Play(path + argv[1]);
 int CmdPlayFile(int argc, char** argv) {
   static const std::string usage = "usage: play [file]";
   if (argc != 2) {
@@ -75,7 +78,9 @@ int CmdPlayFile(int argc, char** argv) {
   }
 
   std::string path = "/";
-  sInstance->playback_->Play(path + argv[1]);
+
+  events::Dispatch<audio::PlayFile, audio::AudioState>(
+      audio::PlayFile{ .filename = path + argv[1] });
 
   return 0;
 }
@@ -89,77 +94,6 @@ void RegisterPlayFile() {
   esp_console_cmd_register(&cmd);
 }
 
-int CmdToggle(int argc, char** argv) {
-  static const std::string usage = "usage: toggle";
-  if (argc != 1) {
-    std::cout << usage << std::endl;
-    return 1;
-  }
-
-  // sInstance->playback_->Toggle();
-
-  return 0;
-}
-
-void RegisterToggle() {
-  esp_console_cmd_t cmd{.command = "toggle",
-                        .help = "Toggles between play and pause",
-                        .hint = NULL,
-                        .func = &CmdToggle,
-                        .argtable = NULL};
-  esp_console_cmd_register(&cmd);
-}
-
-int CmdVolume(int argc, char** argv) {
-  static const std::string usage = "usage: volume [0-255]";
-  if (argc != 2) {
-    std::cout << usage << std::endl;
-    return 1;
-  }
-
-  long int raw_vol = strtol(argv[1], NULL, 10);
-  if (raw_vol < 0 || raw_vol > 255) {
-    std::cout << usage << std::endl;
-    return 1;
-  }
-
-  // sInstance->playback_->SetVolume((uint8_t)raw_vol);
-
-  return 0;
-}
-
-void RegisterVolume() {
-  esp_console_cmd_t cmd{
-      .command = "vol",
-      .help = "Changes the volume (between 0 and 254. 255 is mute.)",
-      .hint = NULL,
-      .func = &CmdVolume,
-      .argtable = NULL};
-  esp_console_cmd_register(&cmd);
-}
-
-int CmdAudioStatus(int argc, char** argv) {
-  static const std::string usage = "usage: audio";
-  if (argc != 1) {
-    std::cout << usage << std::endl;
-    return 1;
-  }
-
-  sInstance->playback_->LogStatus();
-
-  return 0;
-}
-
-void RegisterAudioStatus() {
-  esp_console_cmd_t cmd{.command = "audio",
-                        .help = "logs the current status of the audio pipeline",
-                        .hint = NULL,
-                        .func = &CmdAudioStatus,
-                        .argtable = NULL};
-  esp_console_cmd_register(&cmd);
-}
-*/
-
 int CmdDbInit(int argc, char** argv) {
   static const std::string usage = "usage: db_init";
   if (argc != 1) {
diff --git a/src/drivers/CMakeLists.txt b/src/drivers/CMakeLists.txt
index 43e67786..82acab3d 100644
--- a/src/drivers/CMakeLists.txt
+++ b/src/drivers/CMakeLists.txt
@@ -4,7 +4,7 @@
 
 idf_component_register(
   SRCS "touchwheel.cpp" "dac.cpp" "gpio_expander.cpp" "battery.cpp" "storage.cpp" "i2c.cpp"
-  "spi.cpp" "display.cpp" "display_init.cpp" "samd.cpp"
+  "spi.cpp" "display.cpp" "display_init.cpp" "samd.cpp" "relative_wheel.cpp"
   INCLUDE_DIRS "include"
   REQUIRES "esp_adc" "fatfs" "result" "lvgl" "span" "tasks")
 target_compile_options(${COMPONENT_LIB} PRIVATE ${EXTRA_WARNINGS})
diff --git a/src/drivers/display.cpp b/src/drivers/display.cpp
index a503d0e9..0c9e56b3 100644
--- a/src/drivers/display.cpp
+++ b/src/drivers/display.cpp
@@ -12,6 +12,7 @@
 
 #include "assert.h"
 #include "driver/gpio.h"
+#include "driver/ledc.h"
 #include "driver/spi_master.h"
 #include "esp_attr.h"
 #include "esp_err.h"
@@ -20,6 +21,7 @@
 #include "freertos/portmacro.h"
 #include "freertos/projdefs.h"
 #include "hal/gpio_types.h"
+#include "hal/ledc_types.h"
 #include "hal/lv_hal_disp.h"
 #include "hal/spi_types.h"
 #include "lvgl/lvgl.h"
@@ -95,16 +97,24 @@ auto Display::Create(GpioExpander* expander,
   gpio_config(&dr_config);
   gpio_set_level(kDisplayDr, 0);
 
-  // TODO: use pwm for the backlight.
-  gpio_config_t led_config{
-      .pin_bit_mask = 1ULL << kDisplayLedEn,
-      .mode = GPIO_MODE_OUTPUT,
-      .pull_up_en = GPIO_PULLUP_ENABLE,
-      .pull_down_en = GPIO_PULLDOWN_DISABLE,
-      .intr_type = GPIO_INTR_DISABLE,
+  ledc_timer_config_t led_config {
+    .speed_mode = LEDC_LOW_SPEED_MODE,
+      .duty_resolution = LEDC_TIMER_13_BIT,
+      .timer_num = LEDC_TIMER_0,
+      .freq_hz = 5000,
+      .clk_cfg = LEDC_AUTO_CLK,
+  };
+  ledc_timer_config(&led_config);
+
+  ledc_channel_config_t led_channel {
+      .gpio_num = kDisplayLedEn,
+    .speed_mode = LEDC_LOW_SPEED_MODE,
+      .channel = LEDC_CHANNEL_0,
+      .timer_sel = LEDC_TIMER_0,
+      .duty = 4095,
+      .hpoint = 0
   };
-  gpio_config(&led_config);
-  gpio_set_level(kDisplayLedEn, 1);
+  ledc_channel_config(&led_channel);
 
   // Next, init the SPI device
   spi_device_interface_config_t spi_cfg = {
@@ -250,7 +260,7 @@ void Display::OnLvglFlush(lv_disp_drv_t* disp_drv,
   // area is stack-allocated, so it isn't safe to reference from the flush
   // thread.
   lv_area_t area_copy = *area;
-  worker_task_->Dispatch<void>([=, this]() {
+  //worker_task_->Dispatch<void>([=, this]() {
     // Ideally we want to complete a single flush as quickly as possible, so
     // grab the bus for this entire transaction sequence.
     spi_device_acquire_bus(handle_, portMAX_DELAY);
@@ -276,7 +286,7 @@ void Display::OnLvglFlush(lv_disp_drv_t* disp_drv,
     spi_device_release_bus(handle_);
 
     lv_disp_flush_ready(&driver_);
-  });
+  //});
 }
 
 void RenderMain(void* raw_args) {
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
diff --git a/src/drivers/relative_wheel.cpp b/src/drivers/relative_wheel.cpp
new file mode 100644
index 00000000..f64d213d
--- /dev/null
+++ b/src/drivers/relative_wheel.cpp
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "relative_wheel.hpp"
+
+#include <stdint.h>
+#include <cstdint>
+
+#include "esp_log.h"
+
+namespace drivers {
+
+RelativeWheel::RelativeWheel(TouchWheel *touch) 
+  :touch_(touch),
+  is_pressed_(false),
+  is_first_read_(true),
+  ticks_(0),
+  last_angle_(0) {}
+
+auto RelativeWheel::Update() -> void {
+  touch_->Update();
+  TouchWheelData d = touch_->GetTouchWheelData();
+  is_pressed_ = d.is_touched;
+
+  uint8_t new_angle = d.wheel_position;
+  if (is_first_read_) {
+    is_first_read_ = false;
+    last_angle_ = new_angle;
+    return;
+  }
+
+  // Work out the magnitude of travel.
+  uint8_t change_cw = last_angle_ - new_angle;
+  uint8_t change_ccw = new_angle - last_angle_;
+  int change = std::min(change_cw, change_ccw);
+
+  last_angle_ = new_angle;
+
+  // Round to eliminate noise.
+  if (change <= 2) {
+    ticks_ = 0;
+    return;
+  }
+
+  // Quantize into ticks.
+  change /= 4;
+
+  // Clamp to reliminate more noise.
+  if (change > 10) {
+    change = 0;
+  }
+
+  // Work out the direction of travel.
+  if (change_cw > change_ccw) {
+    change *= -1;
+  }
+
+  ticks_ = change;
+}
+
+auto RelativeWheel::is_pressed() -> bool {
+  return is_pressed_;
+}
+
+auto RelativeWheel::ticks() -> std::int_fast16_t {
+  int_fast16_t t = ticks_;
+  if (t != 0) {
+  ESP_LOGI("teeks", "ticks %d", t);
+  }
+  ticks_ = 0;
+  return t;
+}
+
+
+}  // namespace drivers
diff --git a/src/events/event_queue.cpp b/src/events/event_queue.cpp
index c69b1e72..1b04cb90 100644
--- a/src/events/event_queue.cpp
+++ b/src/events/event_queue.cpp
@@ -15,7 +15,8 @@ static const std::size_t kMaxPendingEvents = 16;
 
 EventQueue::EventQueue()
     : system_handle_(xQueueCreate(kMaxPendingEvents, sizeof(WorkItem*))),
-      ui_handle_(xQueueCreate(kMaxPendingEvents, sizeof(WorkItem*))) {}
+      ui_handle_(xQueueCreate(kMaxPendingEvents, sizeof(WorkItem*))),
+      audio_handle_(xQueueCreate(kMaxPendingEvents, sizeof(WorkItem*))) {}
 
 auto EventQueue::ServiceSystem(TickType_t max_wait_time) -> bool {
   WorkItem* item;
diff --git a/src/events/include/event_queue.hpp b/src/events/include/event_queue.hpp
index 45d766fd..eb8dd0a0 100644
--- a/src/events/include/event_queue.hpp
+++ b/src/events/include/event_queue.hpp
@@ -9,6 +9,7 @@
 #include <functional>
 #include <type_traits>
 
+#include "audio_fsm.hpp"
 #include "freertos/FreeRTOS.h"
 #include "freertos/portmacro.h"
 #include "freertos/queue.h"
@@ -20,6 +21,11 @@ namespace events {
 
 typedef std::function<void(void)> WorkItem;
 
+/*
+ * Handles communication of events between the system's state machines. Each
+ * event will be dispatched separately to each FSM, on the correct task for
+ * that FSM.
+ */
 class EventQueue {
  public:
   static EventQueue& GetInstance() {
@@ -32,9 +38,11 @@ class EventQueue {
     WorkItem* item = new WorkItem(
         [=]() { tinyfsm::FsmList<Machine>::template dispatch<Event>(ev); });
     if (std::is_same<Machine, ui::UiState>()) {
-      xQueueSend(system_handle_, &item, portMAX_DELAY);
-    } else {
       xQueueSend(ui_handle_, &item, portMAX_DELAY);
+    } else if (std::is_same<Machine, audio::AudioState>()) {
+      xQueueSend(audio_handle_, &item, portMAX_DELAY);
+    } else {
+      xQueueSend(system_handle_, &item, portMAX_DELAY);
     }
     Dispatch<Event, Machines...>(ev);
   }
@@ -44,6 +52,7 @@ class EventQueue {
 
   auto ServiceSystem(TickType_t max_wait_time) -> bool;
   auto ServiceUi(TickType_t max_wait_time) -> bool;
+  auto ServiceAudio(TickType_t max_wait_time) -> bool;
 
   EventQueue(EventQueue const&) = delete;
   void operator=(EventQueue const&) = delete;
@@ -53,6 +62,7 @@ class EventQueue {
 
   QueueHandle_t system_handle_;
   QueueHandle_t ui_handle_;
+  QueueHandle_t audio_handle_;
 };
 
 template <typename Event, typename... Machines>
diff --git a/src/system_fsm/booting.cpp b/src/system_fsm/booting.cpp
index 383bba81..b14da10c 100644
--- a/src/system_fsm/booting.cpp
+++ b/src/system_fsm/booting.cpp
@@ -13,6 +13,7 @@
 #include "event_queue.hpp"
 #include "gpio_expander.hpp"
 #include "lvgl/lvgl.h"
+#include "relative_wheel.hpp"
 #include "spi.hpp"
 #include "system_events.hpp"
 #include "system_fsm.hpp"
@@ -43,25 +44,28 @@ auto Booting::entry() -> void {
   assert(sGpioExpander != nullptr);
 
   // Start bringing up LVGL now, since we have all of its prerequisites.
-  ESP_LOGI(kTag, "starting ui");
+  ESP_LOGI(kTag, "installing ui drivers");
   lv_init();
   sDisplay.reset(drivers::Display::Create(sGpioExpander.get(),
                                           drivers::displays::kST7735R));
   assert(sDisplay != nullptr);
+  sTouch.reset(drivers::TouchWheel::Create());
+  if (sTouch != nullptr) {
+    sRelativeTouch.reset(new drivers::RelativeWheel(sTouch.get()));
+  }
 
   // The UI FSM now has everything it needs to start setting up. Do this now,
   // so that we can properly show the user any errors that appear later.
-  ui::UiState::Init(sGpioExpander.get(), sTouch, sDisplay, sDatabase);
+  ui::UiState::Init(sGpioExpander.get(), sRelativeTouch, sDisplay);
   events::Dispatch<DisplayReady, ui::UiState>(DisplayReady());
 
   // These drivers are required for normal operation, but aren't critical for
   // booting. We will transition to the error state if these aren't present.
   ESP_LOGI(kTag, "installing required drivers");
   sSamd.reset(drivers::Samd::Create());
-  sTouch.reset(drivers::TouchWheel::Create());
-
   auto dac_res = drivers::AudioDac::create(sGpioExpander.get());
-  if (dac_res.has_error() || !sSamd || !sTouch) {
+
+  if (dac_res.has_error() || !sSamd || !sRelativeTouch) {
     events::Dispatch<FatalError, SystemState, ui::UiState, audio::AudioState>(
         FatalError());
     return;
@@ -70,7 +74,7 @@ auto Booting::entry() -> void {
 
   // These drivers are initialised on boot, but are recoverable (if weird) if
   // they fail.
-  ESP_LOGI(kTag, "installing extra drivers");
+  ESP_LOGI(kTag, "installing optional drivers");
   sBattery.reset(drivers::Battery::Create());
 
   // All drivers are now loaded, so we can finish initing the other state
diff --git a/src/system_fsm/include/system_fsm.hpp b/src/system_fsm/include/system_fsm.hpp
index 0153e403..4413f64e 100644
--- a/src/system_fsm/include/system_fsm.hpp
+++ b/src/system_fsm/include/system_fsm.hpp
@@ -14,6 +14,7 @@
 #include "database.hpp"
 #include "display.hpp"
 #include "gpio_expander.hpp"
+#include "relative_wheel.hpp"
 #include "samd.hpp"
 #include "storage.hpp"
 #include "tinyfsm.hpp"
@@ -51,6 +52,7 @@ class SystemState : public tinyfsm::Fsm<SystemState> {
   static std::shared_ptr<drivers::Samd> sSamd;
 
   static std::shared_ptr<drivers::TouchWheel> sTouch;
+  static std::shared_ptr<drivers::RelativeWheel> sRelativeTouch;
   static std::shared_ptr<drivers::Battery> sBattery;
   static std::shared_ptr<drivers::SdStorage> sStorage;
   static std::shared_ptr<drivers::Display> sDisplay;
diff --git a/src/system_fsm/system_fsm.cpp b/src/system_fsm/system_fsm.cpp
index 6956b87c..eb7cce52 100644
--- a/src/system_fsm/system_fsm.cpp
+++ b/src/system_fsm/system_fsm.cpp
@@ -5,6 +5,7 @@
  */
 
 #include "system_fsm.hpp"
+#include "relative_wheel.hpp"
 #include "system_events.hpp"
 
 namespace system_fsm {
@@ -13,6 +14,7 @@ std::shared_ptr<drivers::GpioExpander> SystemState::sGpioExpander;
 std::shared_ptr<drivers::Samd> SystemState::sSamd;
 
 std::shared_ptr<drivers::TouchWheel> SystemState::sTouch;
+std::shared_ptr<drivers::RelativeWheel> SystemState::sRelativeTouch;
 std::shared_ptr<drivers::Battery> SystemState::sBattery;
 std::shared_ptr<drivers::SdStorage> SystemState::sStorage;
 std::shared_ptr<drivers::Display> SystemState::sDisplay;
diff --git a/src/tasks/tasks.cpp b/src/tasks/tasks.cpp
index aa5c4aa7..b95d8e16 100644
--- a/src/tasks/tasks.cpp
+++ b/src/tasks/tasks.cpp
@@ -47,7 +47,7 @@ auto AllocateStack<Type::kAudio>() -> cpp::span<StackType_t> {
 // PSRAM so we give it a bit of headroom for safety.
 template <>
 auto AllocateStack<Type::kUi>() -> cpp::span<StackType_t> {
-  std::size_t size = 16 * 1024;
+  std::size_t size = 32 * 1024;
   return {static_cast<StackType_t*>(heap_caps_malloc(size, MALLOC_CAP_DEFAULT)),
           size};
 }
diff --git a/src/ui/CMakeLists.txt b/src/ui/CMakeLists.txt
index 9a41ae0d..bd0b76f0 100644
--- a/src/ui/CMakeLists.txt
+++ b/src/ui/CMakeLists.txt
@@ -3,7 +3,7 @@
 # SPDX-License-Identifier: GPL-3.0-only
 
 idf_component_register(
-  SRCS "lvgl_task.cpp" "ui_fsm.cpp" "screen_splash.cpp" "screen_menu.cpp"
+  SRCS "lvgl_task.cpp" "ui_fsm.cpp" "screen_splash.cpp" "screen_menu.cpp" "wheel_encoder.cpp"
   INCLUDE_DIRS "include"
   REQUIRES "drivers" "lvgl" "tinyfsm" "events" "system_fsm" "database" "esp_timer")
 target_compile_options(${COMPONENT_LIB} PRIVATE ${EXTRA_WARNINGS})
diff --git a/src/ui/include/lvgl_task.hpp b/src/ui/include/lvgl_task.hpp
index 25e7dd14..8e387683 100644
--- a/src/ui/include/lvgl_task.hpp
+++ b/src/ui/include/lvgl_task.hpp
@@ -14,11 +14,12 @@
 #include "freertos/task.h"
 
 #include "display.hpp"
+#include "relative_wheel.hpp"
 #include "touchwheel.hpp"
 
 namespace ui {
 
-auto StartLvgl(std::weak_ptr<drivers::TouchWheel> touch_wheel,
+auto StartLvgl(std::weak_ptr<drivers::RelativeWheel> touch_wheel,
                std::weak_ptr<drivers::Display> display) -> void;
 
 }  // namespace ui
diff --git a/src/ui/include/screen.hpp b/src/ui/include/screen.hpp
new file mode 100644
index 00000000..87a0d9b8
--- /dev/null
+++ b/src/ui/include/screen.hpp
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+
+#include "core/lv_obj.h"
+#include "core/lv_obj_tree.h"
+#include "lvgl.h"
+
+namespace ui {
+
+class Screen {
+ public:
+  Screen() : root_(lv_obj_create(NULL)) {}
+  virtual ~Screen() { lv_obj_del(root_); }
+
+  auto root() -> lv_obj_t* { return root_; }
+
+ protected:
+  lv_obj_t* const root_;
+};
+
+}  // namespace ui
diff --git a/src/ui/include/screen_menu.hpp b/src/ui/include/screen_menu.hpp
new file mode 100644
index 00000000..a0b07b9e
--- /dev/null
+++ b/src/ui/include/screen_menu.hpp
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+
+#include "lvgl.h"
+
+#include "screen.hpp"
+
+namespace ui {
+namespace screens {
+
+class Menu : public Screen {
+ public:
+  Menu();
+  ~Menu();
+
+ private:
+  lv_obj_t* container_;
+  lv_obj_t* label_;
+};
+
+}  // namespace screens
+}  // namespace ui
diff --git a/src/ui/include/screen_splash.hpp b/src/ui/include/screen_splash.hpp
new file mode 100644
index 00000000..1ee7dd89
--- /dev/null
+++ b/src/ui/include/screen_splash.hpp
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+
+#include "lvgl.h"
+
+#include "screen.hpp"
+
+namespace ui {
+namespace screens {
+
+class Splash : public Screen {
+ public:
+  Splash();
+  ~Splash();
+
+ private:
+  lv_obj_t* container_;
+  lv_obj_t* label_;
+  lv_obj_t* spinner_;
+};
+
+}  // namespace screens
+}  // namespace ui
diff --git a/src/ui/include/ui_fsm.hpp b/src/ui/include/ui_fsm.hpp
index 2afcfa86..d4d23bb0 100644
--- a/src/ui/include/ui_fsm.hpp
+++ b/src/ui/include/ui_fsm.hpp
@@ -8,9 +8,9 @@
 
 #include <memory>
 
+#include "relative_wheel.hpp"
 #include "tinyfsm.hpp"
 
-#include "database.hpp"
 #include "display.hpp"
 #include "screen.hpp"
 #include "storage.hpp"
@@ -22,9 +22,8 @@ namespace ui {
 class UiState : public tinyfsm::Fsm<UiState> {
  public:
   static auto Init(drivers::GpioExpander* gpio_expander,
-                   std::weak_ptr<drivers::TouchWheel> touchwheel,
-                   std::weak_ptr<drivers::Display> display,
-                   std::weak_ptr<database::Database> database) -> void;
+                   std::weak_ptr<drivers::RelativeWheel> touchwheel,
+                   std::weak_ptr<drivers::Display> display) -> void;
 
   virtual ~UiState() {}
 
@@ -43,9 +42,8 @@ class UiState : public tinyfsm::Fsm<UiState> {
 
  protected:
   static drivers::GpioExpander* sGpioExpander;
-  static std::weak_ptr<drivers::TouchWheel> sTouchWheel;
+  static std::weak_ptr<drivers::RelativeWheel> sTouchWheel;
   static std::weak_ptr<drivers::Display> sDisplay;
-  static std::weak_ptr<database::Database> sDatabase;
 
   static std::shared_ptr<Screen> sCurrentScreen;
 };
diff --git a/src/ui/include/ui_tick.hpp b/src/ui/include/ui_tick.hpp
new file mode 100644
index 00000000..37f8a8bd
--- /dev/null
+++ b/src/ui/include/ui_tick.hpp
@@ -0,0 +1,11 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include "esp_timer.h"
+
+#define LV_TICK_CUSTOM_SYS_TIME_EXPR (esp_timer_get_time() / 1000)
diff --git a/src/ui/include/wheel_encoder.hpp b/src/ui/include/wheel_encoder.hpp
new file mode 100644
index 00000000..0651ce0b
--- /dev/null
+++ b/src/ui/include/wheel_encoder.hpp
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#pragma once
+
+#include <memory>
+
+#include "hal/lv_hal_indev.h"
+
+#include "relative_wheel.hpp"
+
+namespace ui {
+
+class TouchWheelEncoder {
+  public:
+    explicit TouchWheelEncoder(std::weak_ptr<drivers::RelativeWheel> wheel);
+
+    auto Read(lv_indev_data_t *data) -> void;
+    auto registration() -> lv_indev_t* { return registration_; }
+
+  private:
+      lv_indev_drv_t driver_;
+      lv_indev_t *registration_;
+      std::weak_ptr<drivers::RelativeWheel> wheel_;
+};
+
+} // namespace ui
diff --git a/src/ui/lvgl_task.cpp b/src/ui/lvgl_task.cpp
index f2f7c67c..1ce7fd40 100644
--- a/src/ui/lvgl_task.cpp
+++ b/src/ui/lvgl_task.cpp
@@ -15,6 +15,8 @@
 #include <memory>
 
 #include "core/lv_disp.h"
+#include "core/lv_group.h"
+#include "core/lv_indev.h"
 #include "core/lv_obj.h"
 #include "core/lv_obj_pos.h"
 #include "core/lv_obj_tree.h"
@@ -25,15 +27,18 @@
 #include "freertos/projdefs.h"
 #include "freertos/timers.h"
 #include "hal/gpio_types.h"
+#include "hal/lv_hal_indev.h"
 #include "hal/spi_types.h"
 #include "lv_api_map.h"
 #include "lvgl/lvgl.h"
 #include "misc/lv_color.h"
 #include "misc/lv_style.h"
 #include "misc/lv_timer.h"
+#include "relative_wheel.hpp"
 #include "tasks.hpp"
 #include "touchwheel.hpp"
 #include "ui_fsm.hpp"
+#include "wheel_encoder.hpp"
 #include "widgets/lv_label.h"
 
 #include "display.hpp"
@@ -43,11 +48,16 @@ namespace ui {
 
 static const char* kTag = "lv_task";
 
-void LvglMain(std::weak_ptr<drivers::TouchWheel> weak_touch_wheel,
+void LvglMain(std::weak_ptr<drivers::RelativeWheel> weak_touch_wheel,
               std::weak_ptr<drivers::Display> weak_display) {
   ESP_LOGI(kTag, "init lvgl");
   lv_init();
 
+  TouchWheelEncoder encoder(weak_touch_wheel);
+  lv_group_t *nav_group = lv_group_create();
+  lv_group_set_default(nav_group);
+  lv_indev_set_group(encoder.registration(), nav_group);
+
   std::shared_ptr<Screen> current_screen;
   auto& events = events::EventQueue::GetInstance();
   while (1) {
@@ -65,10 +75,12 @@ void LvglMain(std::weak_ptr<drivers::TouchWheel> weak_touch_wheel,
     // 30 FPS
     // TODO(jacqueline): make this dynamic
     vTaskDelay(pdMS_TO_TICKS(33));
+    lv_indev_data_t d;
+    encoder.Read(&d);
   }
 }
 
-auto StartLvgl(std::weak_ptr<drivers::TouchWheel> touch_wheel,
+auto StartLvgl(std::weak_ptr<drivers::RelativeWheel> touch_wheel,
                std::weak_ptr<drivers::Display> display) -> void {
   tasks::StartPersistent<tasks::Type::kUi>(
       [=]() { LvglMain(touch_wheel, display); });
diff --git a/src/ui/screen_menu.cpp b/src/ui/screen_menu.cpp
new file mode 100644
index 00000000..da0a7d3c
--- /dev/null
+++ b/src/ui/screen_menu.cpp
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "screen_menu.hpp"
+
+#include "core/lv_group.h"
+#include "core/lv_obj_pos.h"
+#include "extra/widgets/menu/lv_menu.h"
+#include "extra/widgets/spinner/lv_spinner.h"
+#include "hal/lv_hal_disp.h"
+#include "misc/lv_area.h"
+#include "widgets/lv_label.h"
+
+namespace ui {
+namespace screens {
+
+Menu::Menu() {
+  lv_obj_t *menu = lv_menu_create(root_);
+  lv_obj_set_size(menu, lv_disp_get_hor_res(NULL), lv_disp_get_ver_res(NULL));
+  lv_obj_center(menu);
+
+  lv_obj_t *main_page = lv_menu_page_create(menu, NULL);
+
+  lv_obj_t *container;
+  lv_obj_t *label;
+
+  container = lv_menu_cont_create(main_page);
+  label = lv_label_create(container);
+  lv_label_set_text(label, "I am an item");
+
+  container = lv_menu_cont_create(main_page);
+  label = lv_label_create(container);
+  lv_label_set_text(label, "I am also an item");
+
+  container = lv_menu_cont_create(main_page);
+  label = lv_label_create(container);
+  lv_label_set_text(label, "Item #3");
+
+  container = lv_menu_cont_create(main_page);
+  label = lv_label_create(container);
+  lv_label_set_text(label, "Yay!");
+
+  lv_menu_set_page(menu, main_page);
+}
+
+Menu::~Menu() {}
+
+}  // namespace screens
+}  // namespace ui
diff --git a/src/ui/screen_splash.cpp b/src/ui/screen_splash.cpp
new file mode 100644
index 00000000..2b2a7b1e
--- /dev/null
+++ b/src/ui/screen_splash.cpp
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "screen_splash.hpp"
+
+#include "core/lv_obj_pos.h"
+#include "extra/widgets/spinner/lv_spinner.h"
+#include "misc/lv_area.h"
+#include "widgets/lv_label.h"
+
+namespace ui {
+namespace screens {
+
+Splash::Splash() {
+  container_ = lv_obj_create(root_);
+  lv_obj_set_align(container_, LV_ALIGN_CENTER);
+  lv_obj_set_size(container_, LV_SIZE_CONTENT, LV_SIZE_CONTENT);
+
+  label_ = lv_label_create(container_);
+  lv_label_set_text_static(label_, "TANGARA");
+  lv_obj_set_align(label_, LV_ALIGN_TOP_MID);
+
+  spinner_ = lv_spinner_create(container_, 1000, 60);
+  lv_obj_set_size(spinner_, 32, 32);
+  lv_obj_align_to(spinner_, label_, LV_ALIGN_OUT_BOTTOM_MID, 0, 8);
+}
+
+Splash::~Splash() {
+  lv_obj_del(spinner_);
+  lv_obj_del(label_);
+  lv_obj_del(container_);
+}
+
+}  // namespace screens
+}  // namespace ui
diff --git a/src/ui/ui_fsm.cpp b/src/ui/ui_fsm.cpp
index b08722aa..f12104e6 100644
--- a/src/ui/ui_fsm.cpp
+++ b/src/ui/ui_fsm.cpp
@@ -7,6 +7,7 @@
 #include "ui_fsm.hpp"
 #include "display.hpp"
 #include "lvgl_task.hpp"
+#include "relative_wheel.hpp"
 #include "screen.hpp"
 #include "screen_menu.hpp"
 #include "screen_splash.hpp"
@@ -16,20 +17,17 @@
 namespace ui {
 
 drivers::GpioExpander* UiState::sGpioExpander;
-std::weak_ptr<drivers::TouchWheel> UiState::sTouchWheel;
+std::weak_ptr<drivers::RelativeWheel> UiState::sTouchWheel;
 std::weak_ptr<drivers::Display> UiState::sDisplay;
-std::weak_ptr<database::Database> UiState::sDatabase;
 
 std::shared_ptr<Screen> UiState::sCurrentScreen;
 
 auto UiState::Init(drivers::GpioExpander* gpio_expander,
-                   std::weak_ptr<drivers::TouchWheel> touchwheel,
-                   std::weak_ptr<drivers::Display> display,
-                   std::weak_ptr<database::Database> database) -> void {
+                   std::weak_ptr<drivers::RelativeWheel> touchwheel,
+                   std::weak_ptr<drivers::Display> display) -> void {
   sGpioExpander = gpio_expander;
   sTouchWheel = touchwheel;
   sDisplay = display;
-  sDatabase = database;
 }
 
 namespace states {
@@ -47,7 +45,7 @@ void Splash::react(const system_fsm::BootComplete& ev) {
 }
 
 void Interactive::entry() {
-  // sCurrentScreen.reset(new screens::Menu());
+  //sCurrentScreen.reset(new screens::Menu());
 }
 
 }  // namespace states
diff --git a/src/ui/wheel_encoder.cpp b/src/ui/wheel_encoder.cpp
new file mode 100644
index 00000000..0129434d
--- /dev/null
+++ b/src/ui/wheel_encoder.cpp
@@ -0,0 +1,39 @@
+/*
+ * Copyright 2023 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "wheel_encoder.hpp"
+#include "hal/lv_hal_indev.h"
+
+namespace ui {
+
+void encoder_read(lv_indev_drv_t * drv, lv_indev_data_t*data){
+  TouchWheelEncoder *instance = reinterpret_cast<TouchWheelEncoder*>(drv->user_data);
+  instance->Read(data);
+}
+
+  TouchWheelEncoder::TouchWheelEncoder(std::weak_ptr<drivers::RelativeWheel> wheel) : wheel_(wheel) {
+    lv_indev_drv_init(&driver_);
+    driver_.type = LV_INDEV_TYPE_ENCODER;
+    driver_.read_cb = encoder_read;
+    driver_.user_data = this;
+
+    registration_ = lv_indev_drv_register(&driver_);
+  }
+
+auto TouchWheelEncoder::Read(lv_indev_data_t *data) -> void {
+  auto lock = wheel_.lock();
+  if (lock == nullptr) {
+    data->state = LV_INDEV_STATE_RELEASED;
+    data->enc_diff = 0;
+    return;
+  }
+
+  lock->Update();
+  data->state = lock->is_pressed() ? LV_INDEV_STATE_PRESSED : LV_INDEV_STATE_RELEASED;
+  data->enc_diff = lock->ticks();
+}
+
+} // namespace ui