Led_control.v

//
//  HPSDR - High Performance Software Defined Radio
//
//  BootLoader code. 
//
//  This program is free software; you can redistribute it and/or modify
//  it under the terms of the GNU General Public License as published by
//  the Free Software Foundation; either version 2 of the License, or
//  (at your option) any later version.
//
//  This program is distributed in the hope that it will be useful,
//  but WITHOUT ANY WARRANTY; without even the implied warranty of
//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//  GNU General Public License for more details.
//
//  You should have received a copy of the GNU General Public License
//  along with this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


//  Led_control - copyright 2010, 2011 Phil Harman VK6APH 




// Led control module

// setting on  = high turns the LED on
// setting slow_flash = high flashes the LED once per second 
// setting fast_flash = high flashes the LED 5 times per second

// clock is at 12.5 MHz


module Led_control (clock, on, slow_flash, fast_flash, LED);

input clock;
input on;
input slow_flash;
input fast_flash;

output reg LED;

parameter clock_speed = 1;

// calculate timer variables based on clock_speed passed

localparam slow_period = clock_speed/10;		// one flash per second
localparam fast_period = clock_speed/50;	// 5 flashes per second


reg [23:0]counter;

always @ (posedge clock)
begin
		if (on)
			LED <= 1;
		else if (slow_flash) begin
			if (counter == slow_period) begin
				LED <= ~LED;
				counter <= 0;
			end 
			else counter <= counter + 1'b1;
		end 
		else if (fast_flash) begin
			if (counter == fast_period) begin
				LED <= ~LED;
				counter <= 0;
			end 
			else counter <= counter + 1'b1;
		end 
		else LED <= 0;    // LED off 		
end
endmodule