//////////////////////////////////////////////////////////////////////
//// ////
//// registerInterface.v ////
//// ////
//// This file is part of the i2cSlave opencores effort.
//// ////
//// ////
//// Module Description: ////
//// You will need to modify this file to implement your
//// interface.
//// Add your control and status bytes/bits to module inputs and outputs,
//// and also to the I2C read and write process blocks
//// ////
//// To Do: ////
////
//// ////
//// Author(s): ////
//// - Steve Fielding, sfielding@base2designs.com ////
//// ////
//////////////////////////////////////////////////////////////////////
//// ////
//// Copyright (C) 2008 Steve Fielding and OPENCORES.ORG ////
//// ////
//// This source file may be used and distributed without ////
//// restriction provided that this copyright statement is not ////
//// removed from the file and that any derivative work contains ////
//// the original copyright notice and the associated disclaimer. ////
//// ////
//// This source file is free software; you can redistribute it ////
//// and/or modify it under the terms of the GNU Lesser General ////
//// Public License as published by the Free Software Foundation; ////
//// either version 2.1 of the License, or (at your option) any ////
//// later version. ////
//// ////
//// This source 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 Lesser General Public License for more ////
//// details. ////
//// ////
//// You should have received a copy of the GNU Lesser General ////
//// Public License along with this source; if not, download it ////
//// from ////
//// ////
//////////////////////////////////////////////////////////////////////
//
`include "i2cSlave_define.v"
module registerInterface (
clk,
addr,
dataIn,
writeEn,
dataOut,
reg0_auto_in,
reg1_led_out,
reg2_switch_in,
reg3_button_in
);
input clk;
input [7:0] addr;
input [7:0] dataIn;
input writeEn;
output [7:0] dataOut;
input [7:0] reg0_auto_in;
output [7:0] reg1_led_out;
input [7:0] reg2_switch_in;
input [7:0] reg3_button_in;
reg [7:0] dataOut;
reg [7:0] reg_auto;
reg [7:0] reg_led;
reg [7:0] reg_switch;
reg [7:0] reg_button;
reg [31:0] counter = 32'h0;
always @(posedge clk) begin
counter <= counter + 1;
end
// --- I2C Read
always @(posedge clk) begin
case (addr)
8'h00: dataOut <= reg_auto;
8'h01: dataOut <= reg_led;
8'h02: dataOut <= reg_switch;
8'h03: dataOut <= reg_button;
8'h04: dataOut <= counter[24:17];
default: dataOut <= 8'h00;
endcase
end
// --- I2C Write (or update from GPIO state)
always @(posedge clk) begin
//only reg_led writeable by I2C
if (writeEn == 1'b1) begin
case (addr)
8'h01: reg_led <= dataIn;
endcase
end
//other regs update from GPIO state every clock
reg_auto <= reg0_auto_in;
reg_switch <= reg2_switch_in;
reg_button <= reg3_button_in;
end
assign reg1_led_out = reg_led;
endmodule