rp2040のpio その2

概要

ラズパイpicoのpioは、小さいcpuです。
verilogが手に入ったのでやってみた。
Lチカ、やってみた。

テストベンチを書いた。

`timescale 1ns/100ps
module test();
	localparam NONE = 0;
	localparam INSTR = 1;
	localparam PEND = 2;
	localparam PULL = 3;
	localparam PUSH = 4;
	localparam GRPS = 5;
	localparam EN = 6;
	localparam DIV = 7;
	localparam SIDES = 8;
	localparam IMM = 9;
	localparam SHIFT = 10;
	reg clk;
	reg reset;
	reg [31:0] din;
	reg [4:0] index;
	reg [3:0] action;
	reg [1:0] mindex;
	reg [31:0] gpio_in = 0;
	reg [15:0] program[0:31];
	wire [31:0] gpio_out;
	wire [31:0] gpio_dir;
	wire [31:0] dout;
	wire [3:0] tx_full;
	wire [3:0] rx_empty;
	wire [5:0] plen = 2;
	wire [23:0] div = 24'h0280;
	wire [31:0] pin_grps = 32'h04000000;
	wire [31:0] exec_ctrl = 32'h00001000;
	wire out;
	assign out = gpio_out[0];
	task act(input [3:0] a, input [31:0] d);
		begin
			@(negedge clk);
			action = a;
			din = d;
			@(posedge clk);
		end
	endtask
	pio u(.clk(clk), .reset(reset), .action(action), .index(index), .mindex(mindex), .din(din), .dout(dout), .gpio_in(gpio_in), .gpio_out(gpio_out), .gpio_dir(gpio_dir), .tx_full(tx_full), .rx_empty(rx_empty));
	integer i;
	initial
	begin
		clk = 1'b0;
	end
	initial
	begin
		program[0] <= 16'he1_01;
		program[1] <= 16'he1_00;
	end
	initial
	begin
		reset = 1'b1;
		repeat(2) @(posedge clk);
		reset = 1'b0;
		for (i = 0; i < plen; i++)
		begin
			index = i;
			act(INSTR, program[i]);
		end
		mindex = 0;
		act(PEND, exec_ctrl);
		act(DIV, div);
		act(GRPS, pin_grps);
		act(EN, 1);
		act(NONE, 0);
		repeat(100) @(posedge clk);
		$finish;
	end
	always
	begin
	#20
		clk = !clk;
	end
	initial
	begin
		$dumpfile("test.vcd");
		$dumpvars(0, test);
		$display("                time action din out ");
		$monitor("%t %h %h %h ", $time, action, din, out);
	end
endmodule

実行結果

>vvp a.out
VCD info: dumpfile test.vcd opened for output.
                time action din out
                   0 x xxxxxxxx x
                 200 x xxxxxxxx 0
                 800 1 0000e101 0
                1200 1 0000e100 0
                1600 2 00001000 0
                2000 7 00000280 0
                2400 5 04000000 0
                2800 6 00000001 0
                3200 0 00000000 0
                4600 0 00000000 1
                6600 0 00000000 0
                8600 0 00000000 1
               10600 0 00000000 0
               12600 0 00000000 1
               14600 0 00000000 0
               16600 0 00000000 1
               18600 0 00000000 0
               20600 0 00000000 1
               22600 0 00000000 0
               24600 0 00000000 1
               26600 0 00000000 0
               28600 0 00000000 1
               30600 0 00000000 0
               32600 0 00000000 1
               34600 0 00000000 0
               36600 0 00000000 1
               38600 0 00000000 0
               40600 0 00000000 1
               42600 0 00000000 0
pio4.v:916: $finish called at 43400 (100ps)

uart_rxは、こちら

uart_txは、こちら

spiは、こちら

以上