Merge develop into main (#313)

- Add app path get() functions to `TactilityC`
- Improved `Dispatcher` and `DispatcherThread`
- Improved `PubSub` (type safety)
- Created test for `DispatcherThread` and `PubSub`
- Save properties files on app exit (various apps) by posting it to the main dispatcher (fixes UI hanging briefly on app exit)
- Fixed bug with `SystemSettings` being read from the wrong file path.
- `loadPropertiesFile()` now uses `file::readLines()` instead of doing that manually
- Increased timer task stack size (required due to issues when reading a properties file for the very first time)
- General cleanup
- Created `EstimatedPower` driver that uses an ADC pin to measure voltage and estimate the battery charge that is left.
- Cleanup of T-Deck board (updated to new style)

Drivers/EstimatedPower/Source/ChargeFromAdcVoltage.cpp

@@ -0,0 +1,67 @@
+#include "ChargeFromAdcVoltage.h"
+#include <Tactility/Log.h>
+#include <algorithm>
+
+constexpr auto TAG = "EstimatePower";
+constexpr auto MAX_VOLTAGE_SAMPLES = 15;
+
+uint8_t ChargeFromAdcVoltage::estimateChargeLevelFromVoltage(uint32_t milliVolt) const {
+    const float volts = std::min((float)milliVolt / 1000.f, configuration.batteryVoltageMax);
+    const float voltage_percentage = (volts - configuration.batteryVoltageMin) / (configuration.batteryVoltageMax - configuration.batteryVoltageMin);
+    const float voltage_factor = std::min(1.0f, voltage_percentage);
+    const auto charge_level = (uint8_t) (voltage_factor * 100.f);
+    TT_LOG_V(TAG, "mV = %lu, scaled = %.2f, factor = %.2f, result = %d", milliVolt, volts, voltage_factor, charge_level);
+    return charge_level;
+}
+
+ChargeFromAdcVoltage::ChargeFromAdcVoltage(const Configuration& configuration) : configuration(configuration) {
+    if (adc_oneshot_new_unit(&configuration.adcConfig, &adcHandle) != ESP_OK) {
+        TT_LOG_E(TAG, "ADC config failed");
+        return;
+    }
+
+    if (adc_oneshot_config_channel(adcHandle, configuration.adcChannel, &configuration.adcChannelConfig) != ESP_OK) {
+        TT_LOG_E(TAG, "ADC channel config failed");
+
+        adc_oneshot_del_unit(adcHandle);
+        return;
+    }
+}
+
+ChargeFromAdcVoltage::~ChargeFromAdcVoltage() {
+    if (adcHandle) {
+        adc_oneshot_del_unit(adcHandle);
+    }
+}
+
+bool ChargeFromAdcVoltage::readBatteryVoltageOnce(uint32_t& output) const {
+    int raw;
+    if (adc_oneshot_read(adcHandle, configuration.adcChannel, &raw) == ESP_OK) {
+        output = configuration.adcMultiplier * ((1000.f * configuration.adcRefVoltage) / 4096.f) * (float)raw;
+        TT_LOG_V(TAG, "Raw = %d, voltage = %lu", raw, output);
+        return true;
+    } else {
+        TT_LOG_E(TAG, "Read failed");
+        return false;
+    }
+}
+
+bool ChargeFromAdcVoltage::readBatteryVoltageSampled(uint32_t& output) const {
+    size_t samples_read = 0;
+    uint32_t sample_accumulator = 0;
+    uint32_t sample_read_buffer;
+
+    for (size_t i = 0; i < MAX_VOLTAGE_SAMPLES; ++i) {
+        if (readBatteryVoltageOnce(sample_read_buffer)) {
+            sample_accumulator += sample_read_buffer;
+            samples_read++;
+        }
+    }
+
+    if (samples_read == 0) {
+        return false;
+    }
+
+    output = sample_accumulator / samples_read;
+    return true;
+}

Drivers/EstimatedPower/Source/ChargeFromAdcVoltage.h

@@ -0,0 +1,42 @@
+#pragma once
+
+#include <esp_adc/adc_oneshot.h>
+
+class ChargeFromAdcVoltage {
+
+public:
+
+    struct Configuration {
+        adc_channel_t adcChannel = ADC_CHANNEL_3;
+        float adcMultiplier = 1.0f;
+        float adcRefVoltage = 3.3f;
+        float batteryVoltageMin = 3.2f;
+        float batteryVoltageMax = 4.2f;
+        adc_oneshot_unit_init_cfg_t adcConfig = {
+            .unit_id = ADC_UNIT_1,
+            .clk_src = ADC_RTC_CLK_SRC_DEFAULT,
+            .ulp_mode = ADC_ULP_MODE_DISABLE,
+        };
+        adc_oneshot_chan_cfg_t adcChannelConfig = {
+            .atten = ADC_ATTEN_DB_12,
+            .bitwidth = ADC_BITWIDTH_DEFAULT,
+        };
+    };
+
+private:
+
+    adc_oneshot_unit_handle_t adcHandle = nullptr;
+    Configuration configuration;
+
+public:
+
+    explicit ChargeFromAdcVoltage(const Configuration& configuration);
+
+    ~ChargeFromAdcVoltage();
+
+    uint8_t estimateChargeLevelFromVoltage(uint32_t milliVolt) const;
+
+    bool readBatteryVoltageSampled(uint32_t& output) const;
+
+    bool readBatteryVoltageOnce(uint32_t& output) const;
+};

Drivers/EstimatedPower/Source/EstimatedPower.cpp

@@ -0,0 +1,30 @@
+#include "EstimatedPower.h"
+
+bool EstimatedPower::supportsMetric(MetricType type) const {
+    switch (type) {
+        using enum MetricType;
+        case BatteryVoltage:
+        case ChargeLevel:
+            return true;
+        default:
+            return false;
+    }
+}
+
+bool EstimatedPower::getMetric(MetricType type, MetricData& data) {
+    switch (type) {
+        using enum MetricType;
+        case BatteryVoltage:
+            return chargeFromAdcVoltage->readBatteryVoltageSampled(data.valueAsUint32);
+        case ChargeLevel:
+            if (chargeFromAdcVoltage->readBatteryVoltageSampled(data.valueAsUint32)) {
+                data.valueAsUint32 = chargeFromAdcVoltage->estimateChargeLevelFromVoltage(data.valueAsUint32);
+                return true;
+            } else {
+                return false;
+            }
+        default:
+            return false;
+    }
+}
+

Drivers/EstimatedPower/Source/EstimatedPower.h

@@ -0,0 +1,27 @@
+#pragma once
+
+#include <ChargeFromAdcVoltage.h>
+#include <Tactility/hal/power/PowerDevice.h>
+
+using tt::hal::power::PowerDevice;
+
+/**
+ * Uses Voltage measurements to estimate charge.
+ * Supports voltage and charge level metrics.
+ * Can be overridden to further extend supported metrics.
+ */
+class EstimatedPower final : public PowerDevice {
+
+    std::unique_ptr<ChargeFromAdcVoltage> chargeFromAdcVoltage;
+
+public:
+
+    EstimatedPower(ChargeFromAdcVoltage::Configuration configuration) :
+        chargeFromAdcVoltage(std::make_unique<ChargeFromAdcVoltage>(std::move(configuration))) {}
+
+    std::string getName() const override { return "ADC Power Measurement"; }
+    std::string getDescription() const override { return "Power measurement interface via ADC pin"; }
+
+    bool supportsMetric(MetricType type) const override;
+    bool getMetric(MetricType type, MetricData& data) override;
+};