Implemented power management (#67)

- Implemented HAL for for power management
- Implemented the Power app (accessible via Settings app)
- Implemented status bar icon for battery status

app-sim/src/hardware_config.c

@@ -5,6 +5,8 @@
 
 #define TAG "hardware"
 
+extern const Power power;
+
 static bool lvgl_init() {
     lv_init();
     lvgl_task_start();
@@ -22,7 +24,12 @@ TT_UNUSED static void lvgl_deinit() {
 #endif
 }
 
-HardwareConfig sim_hardware = {
+const HardwareConfig sim_hardware = {
     .bootstrap = NULL,
     .init_graphics = &lvgl_init,
+    .display = {
+        .set_backlight_duty = NULL,
+    },
+    .power = &power,
+    .sdcard = NULL
 };

app-sim/src/main.c

@@ -1,7 +1,7 @@
 #include "hello_world/hello_world.h"
 #include "tactility.h"
 
-extern HardwareConfig sim_hardware;
+extern const HardwareConfig sim_hardware;
 
 void app_main() {
     static const Config config = {

app-sim/src/power.c

@@ -0,0 +1,34 @@
+#include "power.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+static bool is_charging_enabled = false;
+
+static bool power_is_charging() {
+    return is_charging_enabled;
+}
+
+static void power_set_charging_enabled(bool enabled) {
+    is_charging_enabled = enabled;
+}
+
+static uint8_t power_get_charge_level() {
+    return 204;
+}
+
+static int32_t power_get_current() {
+    return is_charging_enabled ? 100 : -50;
+}
+
+const Power power = {
+    .is_charging = &power_is_charging,
+    .set_charging_enabled = &power_set_charging_enabled,
+    .get_charge_level = &power_get_charge_level,
+    .get_current = &power_get_current
+};
+
+#ifdef __cplusplus
+}
+#endif