
`timescale 1 ns / 1 ps

`include "caravel.v"
`include "spiflash.v"

module mprj_ctrl_tb;
	reg clock;
	reg RSTB;

	wire gpio;
	wire flash_csb;
	wire flash_clk;
	wire flash_io0;
	wire flash_io1;
	wire [36:0] user_io;
	wire SDO;

	wire [15:0] checkbits;

	// External clock is used by default.  Make this artificially fast for the
	// simulation.  Normally this would be a slow clock and the digital PLL
	// would be the fast clock.

	always #10 clock <= (clock === 1'b0);

	initial begin
		clock = 0;
	end

	initial begin
		$dumpfile("mprj_ctrl_tb.vcd");
		$dumpvars(0, mprj_ctrl_tb);
		repeat (25) begin
			repeat (1000) @(posedge clock);
			$display("+1000 cycles");
		end
		$display("%c[1;31m",27);
		$display ("Monitor: Timeout, Test Mega-Project (RTL) Failed");
		 $display("%c[0m",27);
		$finish;
	end

	always @(checkbits) begin
		if(checkbits == 16'hA040) begin
			$display("Mega-Project control Test started");
		end
		else if(checkbits == 16'hAB40) begin
			$display("%c[1;31m",27);
			$display("Monitor: IO control R/W failed");
			$display("%c[0m",27);
			$finish;
		end
		else if(checkbits == 16'hAB41) begin
			$display("Monitor: IO control R/W passed");
		end
        else if(checkbits == 16'hAB50) begin
            $display("%c[1;31m",27);
			$display("Monitor: power control R/W failed");
			$display("%c[0m",27);
			$finish;
        end else if(checkbits == 16'hAB51) begin
			$display("Monitor: power control R/W passed");
            $display("Monitor: Mega-Project control (RTL) test passed.");
            $finish;
        end			
	end

	initial begin
		RSTB <= 1'b0;
		#1000;
		RSTB <= 1'b1;	    // Release reset
		#2000;
	end

	always @(gpio) begin
		#1 $display("GPIO state = %b ", gpio);
	end

	wire VDD3V3;
	wire VDD1V8;
	wire VSS;
	
	assign VSS = 1'b0;
	assign VDD1V8 = 1'b1;
	assign VDD3V3 = 1'b1;

	caravel uut (
		.vddio	  (VDD3V3),
		.vssio	  (VSS),
		.vdda	  (VDD3V3),
		.vssa	  (VSS),
		.vccd	  (VDD1V8),
		.vssd	  (VSS),
		.vdda1    (VDD3V3),
		.vdda2    (VDD3V3),
		.vssa1	  (VSS),
		.vssa2	  (VSS),
		.vccd1	  (VDD1V8),
		.vccd2	  (VDD1V8),
		.vssd1	  (VSS),
		.vssd2	  (VSS),
		.clock	   (clock),
		.gpio      (gpio),
		.mprj_io   (user_io),
		.flash_csb (flash_csb),
		.flash_clk (flash_clk),
		.flash_io0 (flash_io0),
		.flash_io1 (flash_io1),
		.resetb	   (RSTB)
	);

	spiflash #(
		.FILENAME("mprj_ctrl.hex")
	) spiflash (
		.csb(flash_csb),
		.clk(flash_clk),
		.io0(flash_io0),
		.io1(flash_io1),
		.io2(),			// not used
		.io3()			// not used
	);

endmodule