
`timescale 1 ns / 1 ps

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

module la_test1_tb;
	reg clock;
    	reg RSTB;
	wire SDO;

    	wire gpio;
	wire uart_tx;
    	wire [36:0] mprj_io;
	wire [15:0] checkbits;

	assign checkbits  = mprj_io[31:16];
	assign uart_tx = mprj_io[6];

	always #12.5 clock <= (clock === 1'b0);

	initial begin
		clock = 0;
	end

	initial begin
		$dumpfile("la_test1.vcd");
		$dumpvars(0, la_test1_tb);

		// Repeat cycles of 1000 clock edges as needed to complete testbench
		repeat (200) begin
			repeat (1000) @(posedge clock);
			// $display("+1000 cycles");
		end
		$display("%c[1;31m",27);
		$display ("Monitor: Timeout, Test Mega-Project IO (RTL) Failed");
		$display("%c[0m",27);
		$finish;
	end

	initial begin
		wait(checkbits == 16'hAB40);
		$display("LA Test 1 started");
		wait(checkbits == 16'hAB41);
		wait(checkbits == 16'hAB51);
		#10000;
		$finish;
	end

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

	wire VDD1V8;
    	wire VDD3V3;
	wire VSS;
    
    	wire flash_csb;
	wire flash_clk;
	wire flash_io0;
	wire flash_io1;

	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  (mprj_io),
		.flash_csb(flash_csb),
		.flash_clk(flash_clk),
		.flash_io0(flash_io0),
		.flash_io1(flash_io1),
		.resetb	  (RSTB)
	);

	spiflash #(
		.FILENAME("la_test1.hex")
	) spiflash (
		.csb(flash_csb),
		.clk(flash_clk),
		.io0(flash_io0),
		.io1(flash_io1),
		.io2(),			// not used
		.io3()			// not used
	);

	// Testbench UART
	tbuart tbuart (
		.ser_rx(uart_tx)
	);

endmodule