Momentum-Firmware/applications/external/radar_scanner/radar_scanner.c

// Created by @MatthewKuKanich for use with the RCWL-0516
// Design inspired from @unixispower Wire Tester

#include <furi_hal.h>
#include <gui/gui.h>
#include <notification/notification_messages.h>
#include <gui/elements.h>

static const uint32_t EVENT_PERIOD_MS = 10;
static const float BEEP_FREQ = 1000.0f;
static const float BEEP_VOL = 0.9f;
static const GpioPin* const radarPin = &gpio_ext_pc3; // Pin 7
static const GpioPin* const altRadarPin = &gpio_ext_pa7; // Pin 2
static const GpioPin* const altGroundPin = &gpio_ext_pa6; // Pin 3

bool presenceDetected = false;
bool muted = false;
bool active = false;
bool continuous = false; // Start with no signal from OUT
bool altPinout; // Sets which GPIO pinout config to use

static void start_feedback(NotificationApp* notifications) {
    // Set LED to red for detection
    notification_message_block(notifications, &sequence_set_only_red_255);

    // Set vibration
    notification_message_block(notifications, &sequence_double_vibro);

    if(!muted) {
        // Start beep if not muted
        if(furi_hal_speaker_acquire(1000)) {
            furi_hal_speaker_start(BEEP_FREQ, BEEP_VOL);
        }
    }
}

static void stop_feedback(NotificationApp* notifications) {
    // Clear LED
    notification_message_block(notifications, &sequence_reset_rgb);

    // Reset vibration
    notification_message_block(notifications, &sequence_reset_vibro);

    // Stop beeping
    if(furi_hal_speaker_is_mine()) {
        furi_hal_speaker_stop();
        furi_hal_speaker_release();
    }
}

static void draw_callback(Canvas* canvas, void* ctx) {
    furi_assert(ctx);

    canvas_clear(canvas);
    canvas_set_font(canvas, FontPrimary);
    elements_multiline_text_aligned(canvas, 64, 2, AlignCenter, AlignTop, "Microwave Radar");
    canvas_set_font(canvas, FontSecondary);
    if(active) {
        elements_multiline_text_aligned(canvas, 64, 12, AlignCenter, AlignTop, "Active");
    } else {
        elements_multiline_text_aligned(canvas, 64, 12, AlignCenter, AlignTop, "On Standby");
    }

    // Display presence status
    canvas_set_font(canvas, FontPrimary);
    if(presenceDetected) {
        elements_multiline_text_aligned(
            canvas, 64, 20, AlignCenter, AlignTop, "Presence Detected");
    } else {
        elements_multiline_text_aligned(canvas, 64, 20, AlignCenter, AlignTop, "No Presence");
    }

    canvas_set_font(canvas, FontSecondary);
    if(muted) {
        elements_multiline_text_aligned(canvas, 64, 32, AlignCenter, AlignTop, "Muted");
    }

    canvas_set_font(canvas, FontBatteryPercent);

    if(altPinout) {
        elements_multiline_text_aligned(
            canvas, 64, 42, AlignCenter, AlignTop, "Alt-Pinout Enabled");
        elements_multiline_text_aligned(
            canvas, 64, 49, AlignCenter, AlignTop, "VIN -> 5v :: GND -> Pin 3");
        elements_multiline_text_aligned(
            canvas, 64, 56, AlignCenter, AlignTop, "OUT -> Pin 2 (A7)");
    } else if(!altPinout) {
        elements_multiline_text_aligned(
            canvas, 64, 42, AlignCenter, AlignTop, "Alt-Pinout Disabled");
        elements_multiline_text_aligned(
            canvas, 64, 49, AlignCenter, AlignTop, "VIN -> 5v :: GND -> GND");
        elements_multiline_text_aligned(
            canvas, 64, 56, AlignCenter, AlignTop, "OUT -> Pin 7 (C3)");
    }
}

static void input_callback(InputEvent* input_event, void* ctx) {
    furi_assert(ctx);
    FuriMessageQueue* event_queue = ctx;
    furi_message_queue_put(event_queue, input_event, FuriWaitForever);
}

static void get_reading() {
    if(altPinout) {
        continuous = furi_hal_gpio_read(altRadarPin);
    } else {
        continuous = furi_hal_gpio_read(radarPin);
    }
}

int32_t app_radar_scanner(void* p) {
    UNUSED(p);
    FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(InputEvent));

    // I'm keeping the forced backlight as you will likely be away from Flipper
    NotificationApp* notifications = furi_record_open(RECORD_NOTIFICATION);
    notification_message_block(notifications, &sequence_display_backlight_enforce_on);

    ViewPort* view_port = view_port_alloc();
    view_port_draw_callback_set(view_port, draw_callback, view_port);
    view_port_input_callback_set(view_port, input_callback, event_queue);

    Gui* gui = furi_record_open(RECORD_GUI);
    gui_add_view_port(gui, view_port, GuiLayerFullscreen);
    view_port_update(view_port);

    stop_feedback(notifications);

    // set input to be low; RCWL-0516 outputs High (3v) on detection
    furi_hal_gpio_init(radarPin, GpioModeInput, GpioPullDown, GpioSpeedVeryHigh);
    furi_hal_gpio_init(altRadarPin, GpioModeInput, GpioPullDown, GpioSpeedVeryHigh);
    furi_hal_gpio_init(altGroundPin, GpioModeOutputPushPull, GpioPullNo, GpioSpeedVeryHigh);
    furi_hal_gpio_write(altGroundPin, false);

    // Auto 5v power
    uint8_t attempts = 0;
    bool otg_was_enabled = furi_hal_power_is_otg_enabled();
    while(!furi_hal_power_is_otg_enabled() && attempts++ < 5) {
        furi_hal_power_enable_otg();
        furi_delay_ms(10);
    }

    bool alarming = false; // Sensor begins in-active until user starts
    bool running = true; // to prevent unwanted false positives

    while(running) {
        if(active) {
            // start and stop feedback if sensor state is active
            get_reading();

            if(continuous && !alarming) {
                presenceDetected = true;
                start_feedback(notifications);

            } else if(!continuous && alarming) {
                presenceDetected = false;
                stop_feedback(notifications); // Green LED if clear/no presence
                notification_message_block(notifications, &sequence_set_only_green_255);
            }
            alarming = continuous;
        }

        // Exit on back key
        InputEvent event;
        if(furi_message_queue_get(event_queue, &event, EVENT_PERIOD_MS) == FuriStatusOk) {
            if(event.type == InputTypePress) {
                if(event.key == InputKeyBack) {
                    break;
                }
                if(event.key == InputKeyOk) {
                    active = !active; // Toggle the value of 'active'
                    stop_feedback(notifications);
                }
                if(event.key == InputKeyDown) {
                    muted = !muted; // Toggle the value of 'muted'
                    stop_feedback(notifications);
                }
                if(event.key == InputKeyRight) {
                    altPinout = !altPinout; // Toggle alternate pinout
                }
            }
        }
    }

    // return control of the LED, beeper, backlight, and stop vibration
    stop_feedback(notifications);
    notification_message_block(notifications, &sequence_display_backlight_enforce_auto);

    // Disable 5v power
    if(furi_hal_power_is_otg_enabled() && !otg_was_enabled) {
        furi_hal_power_disable_otg();
    }

    view_port_enabled_set(view_port, false);
    gui_remove_view_port(gui, view_port);
    view_port_free(view_port);

    furi_message_queue_free(event_queue);
    furi_record_close(RECORD_GUI);
    furi_record_close(RECORD_NOTIFICATION);

    return 0;
}