`timescale 1 ns / 1 ps

module led_ctrl#
	(
		parameter	CLK_PERIOD			= 10
	)
	(
		input						clk			,
		input						rst_n		,
		
		input		[3-1:0]			cmd			,
		output	reg					led
	);
	
	//*****************************************************************************
	// Internal register and wire declarations
	//*****************************************************************************
	wire					st_off			;
	wire					st_on			;
	wire					st_blink		;
	wire					st_breath		;
	
	wire					led_blink		;
	wire					led_breath		;
	
	//*****************************************************************************
	// Instantiation
	//*****************************************************************************
	pwm_gen#
		(
			.DATA_WIDTH		( 28			)
		)
	u_pwm_gen_blink
		(
			.clk			( clk			),
			.rst_n			( rst_n			),
			
			.enable			( st_blink		),
			.period			( 28'hBEBC200	),
			.duty			( 28'h5F5E100	),
			.pwm			( led_blink		)
		);
		
	breath_gen#
		(
			.CLK_PERIOD		( CLK_PERIOD	)
		)
	u_breath_gen
		(
			.clk			( clk			),
			.rst_n			( rst_n			),
			
			.enable			( st_breath		),
			.pwm			( led_breath	)
		);

	//*****************************************************************************
	always @ ( * ) begin
		if (st_off)
			led <= 1'b0;
		else if (st_on)
			led <= 1'b1;
		else if (st_blink)
			led <= led_blink;
		else if (st_breath)
			led <= led_breath;
		else
			led <= 1'b0;
	end
	
	//*****************************************************************************
	// Wire assignment
	//*****************************************************************************
	assign st_off	= (cmd == 3'b000)? 1'b1:1'b0;
	assign st_on	= (cmd == 3'b001)? 1'b1:1'b0;
	assign st_blink	= (cmd == 3'b010)? 1'b1:1'b0;
	assign st_breath= (cmd == 3'b011)? 1'b1:1'b0;
	
endmodule