New board: Elecrow CrowPanel Avance 2.8" (#224)

- Added new board
- Extracted ST7789 driver and backlight PWM driver into separate subprojects
- Refactored T-Deck to use the shared driver modules
- Fix bug in WiFi service: searching for APs was broken

Drivers/PwmBacklight/CMakeLists.txt

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+idf_component_register(
+    SRC_DIRS "Source"
+    INCLUDE_DIRS "Source"
+    REQUIRES TactilityCore driver
+)

Drivers/PwmBacklight/README.md

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+# PWM Backlight Driver
+
+A very basic driver to control an LCD panel backlight with a PWM signal.

Drivers/PwmBacklight/Source/PwmBacklight.cpp

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+#include <Tactility/Log.h>
+#include <driver/ledc.h>
+#include <driver/gpio.h>
+
+#define TAG "pwm_backlight"
+
+namespace driver::pwmbacklight {
+
+static bool isBacklightInitialized = false;
+static gpio_num_t backlightPin = GPIO_NUM_NC;
+
+bool init(gpio_num_t pin) {
+    backlightPin = pin;
+
+    TT_LOG_I(TAG, "Init");
+    ledc_timer_config_t ledc_timer = {
+        .speed_mode = LEDC_LOW_SPEED_MODE,
+        .duty_resolution = LEDC_TIMER_8_BIT,
+        .timer_num = LEDC_TIMER_0,
+        .freq_hz = 4000,
+        .clk_cfg = LEDC_AUTO_CLK,
+        .deconfigure = false
+    };
+
+    if (ledc_timer_config(&ledc_timer) != ESP_OK) {
+        TT_LOG_E(TAG, "Timer config failed");
+        return false;
+    }
+
+    ledc_channel_config_t ledc_channel = {
+        .gpio_num = backlightPin,
+        .speed_mode = LEDC_LOW_SPEED_MODE,
+        .channel = LEDC_CHANNEL_0,
+        .intr_type = LEDC_INTR_DISABLE,
+        .timer_sel = LEDC_TIMER_0,
+        .duty = 0,
+        .hpoint = 0,
+        .sleep_mode = LEDC_SLEEP_MODE_NO_ALIVE_NO_PD,
+        .flags = {
+            .output_invert = 0
+        }
+    };
+
+    if (ledc_channel_config(&ledc_channel) != ESP_OK) {
+        TT_LOG_E(TAG, "Channel config failed");
+    }
+
+    isBacklightInitialized = true;
+
+    return true;
+}
+
+bool setBacklightDuty(uint8_t duty) {
+    if (!isBacklightInitialized) {
+        TT_LOG_E(TAG, "Not initialized");
+        return false;
+    }
+    return ledc_set_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0, duty) == ESP_OK &&
+    ledc_update_duty(LEDC_LOW_SPEED_MODE, LEDC_CHANNEL_0) == ESP_OK;
+}
+
+}

Drivers/PwmBacklight/Source/PwmBacklight.h

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+#pragma once
+
+#include <driver/gpio.h>
+
+namespace driver::pwmbacklight {
+
+bool init(gpio_num_t pin);
+
+void setBacklightDuty(uint8_t duty);
+
+}