step2.v

/**
 * Step 2: Blinker (slower version)
 * DONE*
 */

`default_nettype none
`include "clockworks.v"

module SOC (
    input  CLK,        // system clock 
    input  RESET,      // reset button
    output [4:0] LEDS, // system LEDs
    input  RXD,        // UART receive
    output TXD         // UART transmit
);

   wire clk;    // internal clock
   wire resetn; // internal reset signal, goes low on reset
   
   // A blinker that counts on 5 bits, wired to the 5 LEDs
   reg [4:0] count = 0;
   always @(posedge clk) begin
      count <= !resetn ? 0 : count + 1;
   end

   // Clock gearbox (to let you see what happens)
   // and reset circuitry (to workaround an
   // initialization problem with Ice40)
   Clockworks #(
     .SLOW(21) // Divide clock frequency by 2^21
   )CW(
     .CLK(CLK),
     .RESET(RESET),
     .clk(clk),
     .resetn(resetn)
   );
   
   assign LEDS = count;
   assign TXD  = 1'b0; // not used for now   
endmodule