Momentum-Apps/gpio_reader_a/GPIO_reader.c

#include <furi.h>
#include <gui/gui.h>
#include <input/input.h>
#include <stdlib.h>
#include "GPIO_reader_item.h"

typedef enum {
    EventTypeTick,
    EventTypeKey,
} EventType;

typedef struct {
    EventType type;
    InputEvent input;
} PluginEvent;

typedef struct {
    int pin;
    int pullMode;
} PluginState;


static void render_callback(Canvas* const canvas, void* ctx) {
    const PluginState* plugin_state = acquire_mutex((ValueMutex*)ctx, 25);
    
    canvas_set_font(canvas, FontPrimary);
    canvas_draw_str_aligned(canvas, canvas_width(canvas) / 2, canvas_height(canvas) / 10, AlignCenter, AlignCenter, "GPIO reader");

    canvas_set_font(canvas, FontSecondary);
    canvas_draw_str_aligned(canvas, canvas_width(canvas) / 2, canvas_height(canvas) / 10 * 3, AlignCenter, AlignCenter,
                                gpio_item_get_pin_name(plugin_state->pin));

    canvas_draw_str_aligned(canvas, canvas_width(canvas) / 2, canvas_height(canvas) / 10 * 5, AlignCenter, AlignCenter,
                                gpio_item_get_pull_mode(plugin_state->pullMode));

    canvas_set_font(canvas, FontPrimary);
    canvas_draw_str_aligned(canvas, canvas_width(canvas) / 2, canvas_height(canvas) / 10 * 8, AlignCenter, AlignCenter,
                                gpio_item_get_pin_level(plugin_state->pin));

    release_mutex((ValueMutex*)ctx, plugin_state);
}

static void input_callback(InputEvent* input_event, FuriMessageQueue* event_queue) {
    furi_assert(event_queue); 

    PluginEvent event = {.type = EventTypeKey, .input = *input_event};
    furi_message_queue_put(event_queue, &event, FuriWaitForever);
}

static void GPIO_reader_state_init(PluginState* const plugin_state) {
    plugin_state->pin = 0;
    plugin_state->pullMode = 0;
    gpio_item_configure_pin(plugin_state->pin, plugin_state->pullMode);
} 

int32_t GPIO_reader_app(void* p) {
    UNUSED(p);
    FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(PluginEvent));
    
    PluginState* plugin_state = malloc(sizeof(PluginState));
    GPIO_reader_state_init(plugin_state);
    ValueMutex state_mutex; 
    if (!init_mutex(&state_mutex, plugin_state, sizeof(PluginState))) {
        FURI_LOG_E("GPIO_reader", "cannot create mutex\r\n");
        free(plugin_state); 
        return 255;
    }

    // Set system callbacks
    ViewPort* view_port = view_port_alloc(); 
    view_port_draw_callback_set(view_port, render_callback, &state_mutex);
    view_port_input_callback_set(view_port, input_callback, event_queue);
 
    // Open GUI and register view_port
    Gui* gui = furi_record_open("gui"); 
    gui_add_view_port(gui, view_port, GuiLayerFullscreen); 

   
    PluginEvent event; 
    for(bool processing = true; processing;) { 
        FuriStatus event_status = furi_message_queue_get(event_queue, &event, 100);
        PluginState* plugin_state = (PluginState*)acquire_mutex_block(&state_mutex);

        if(event_status == FuriStatusOk) {
            // press events
            if(event.type == EventTypeKey) {
                if(event.input.type == InputTypePress || event.input.type == InputTypeRepeat) {
                    switch(event.input.key) {
                    case InputKeyRight: 
                            plugin_state->pin = (plugin_state->pin + 1) % GPIO_ITEM_COUNT;
                            gpio_item_configure_pin(plugin_state->pin, plugin_state->pullMode);
                        break; 
                    case InputKeyLeft:  
                            plugin_state->pin = (plugin_state->pin - 1 + GPIO_ITEM_COUNT) % GPIO_ITEM_COUNT;
                            gpio_item_configure_pin(plugin_state->pin, plugin_state->pullMode);
                        break; 
                    case InputKeyUp:
                            plugin_state->pullMode = (plugin_state->pullMode + 1) % GPIO_PULL_COUNT;
                            gpio_item_configure_pin(plugin_state->pin, plugin_state->pullMode);
                        break;
                    case InputKeyDown:
                            plugin_state->pullMode = (plugin_state->pullMode - 1 + GPIO_PULL_COUNT) % GPIO_PULL_COUNT;
                            gpio_item_configure_pin(plugin_state->pin, plugin_state->pullMode);
                        break;
                    case InputKeyBack: 
                        processing = false;
                        break;
                    default:
                        break;
                    }
                }
            } 
        } else {
            FURI_LOG_D("GPIO_reader", "FuriMessageQueue: event timeout");
            // event timeout
        }

        view_port_update(view_port);
        release_mutex(&state_mutex, plugin_state);
    }

    view_port_enabled_set(view_port, false);
    gui_remove_view_port(gui, view_port);
    furi_record_close("gui");
    view_port_free(view_port);
    furi_message_queue_free(event_queue);

    return 0;
}