Momentum-Apps/gps.c

#include "gps_uart.h"

#include <furi.h>
#include <gui/gui.h>
#include <string.h>

typedef enum
{
  EventTypeTick,
  EventTypeKey,
} EventType;

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

static void render_callback(Canvas* const canvas, void* context)
{
  const GpsUart* gps_uart = acquire_mutex((ValueMutex*)context, 25);
  if (gps_uart == NULL)
  {
    return;
  }

  canvas_set_font(canvas, FontSecondary);
  char buffer[64];
  snprintf(buffer, 64, "LAT: %f", (double)gps_uart->status.latitude);
  canvas_draw_str_aligned(canvas, 10, 10, AlignLeft, AlignBottom, buffer);
  snprintf(buffer, 64, "LON: %f", (double)gps_uart->status.longitude);
  canvas_draw_str_aligned(canvas, 10, 30, AlignLeft, AlignBottom, buffer);

  release_mutex((ValueMutex*)context, gps_uart);
}

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);
}

int32_t gps_app(void* p)
{
  UNUSED(p);

  FuriMessageQueue* event_queue = furi_message_queue_alloc(8, sizeof(PluginEvent));

  GpsUart* gps_uart = gps_uart_enable();

  ValueMutex gps_uart_mutex;
  if (!init_mutex(&gps_uart_mutex, gps_uart, sizeof(GpsUart)))
  {
    FURI_LOG_E("GPS", "cannot create mutex\r\n");
    free(gps_uart);
    return 255;
  }

  // set system callbacks
  ViewPort* view_port = view_port_alloc();
  view_port_draw_callback_set(view_port, render_callback, &gps_uart_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);

    GpsUart* gps_uart = (GpsUart*)acquire_mutex_block(&gps_uart_mutex);

    if (event_status == FuriStatusOk)
    {
      // press events
      if (event.type == EventTypeKey)
      {
        if (event.input.type == InputTypePress)
        {
          switch (event.input.key)
          {
            case InputKeyUp:
            case InputKeyDown:
            case InputKeyRight:
            case InputKeyLeft:
            case InputKeyOk:
              break;
            case InputKeyBack:
              processing = false;
              break;
          }
        }
      }
    } 
    else
    {
      FURI_LOG_D("GPS", "FuriMessageQueue: event timeout");
    }

    view_port_update(view_port);
    release_mutex(&gps_uart_mutex, gps_uart);
  }

  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);
  delete_mutex(&gps_uart_mutex);
  gps_uart_disable(gps_uart);

  return 0;
}