/* Draw a frame. 
This function draws a frame with the specified thickness and color on the display, at the specified start offset from the edges. */
static void draw_frame(const uint8_t start, const uint8_t thickness, const gfx_color_t color)
/* Draw a frame. 
This function draws a frame with the specified thickness and color on the display, at the specified start offset from the edges. */
static void draw_frame(const uint8_t start, const uint8_t thickness, const gfx_color_t color)
{
	uint8_t c;
	for (c = 0; c < thickness; c++) {
		gfx_draw_rect(start + c, start + c,
				display_w - ((start + c) * 2),
				display_h - ((start + c) * 2), color);
	}
}