GOWIN GW1N-UV4LQ144C6/I5を動かす

~$ mkdir gowin1.9.8
~/gowin1.9.8$ cd gowin1.9.8/
~/gowin1.9.8$ tar xvfz ~/ダウンロード/Gowin_V1.9.8_linux.tar.gz 
~/gowin1.9.8$ IDE/bin/gw_ide 

~$ cd /etc/udev/rules.d/
/etc/udev/rules.d$ cat 50-tang-nano.rules 
SUBSYSTEMS=="usb", ATTRS{idVendor}=="0403", ATTRS{idProduct}=="6010", ATTRS{product}=="Sipeed-Debug", GROUP="users", MODE="0666"
/etc/udev/rules.d$ sudo udevadm control --reload
/etc/udev/rules.d$ sudo modprobe -r ftdi_sio

/* デバイスは GW1N-4B（GW1N-UV4LQ144C6/I5） */ 

module led
	(
		input wire CLK_IN,
		input wire RST_N,
		input wire SW,
		output wire [2:0]RGB_LED
	);

	parameter time1 =    10'd1000 - 1'd1;
//	parameter time2 =    10'd1000 - 1'd1;	// 1秒周期
	parameter time2 =    10'd500 - 1'd1;	// 0.5秒周期
	
	reg [2:0] rled;
	reg [2:0] rledout;
	reg [9:0] count1;   // PWM DUTY用（1ms周期）
	reg [9:0] count2;   // PWM レベル用（1s周期）
	reg [4:0] ckec;
	reg cke;			// 1us周期イネーブル
    reg dir;
    reg [3:0] dsw;

	reg [9:0] duty;
	
	initial
	begin
		count1=10'b0;
		count2=10'b0;
		rled=3'b110;
		cke = 1'b1;
		ckec <= 5'b0 ;
        dir = 1'b0;
        dsw = 4'b1111;
	end

	// 1MHz周期のイネーブル信号生成
	always @(posedge CLK_IN)begin
		if(RST_N==0)begin
			cke = 1'b1;
		end
		if(ckec == 5'd11)
		begin
			ckec <= 5'b0 ;
			cke <= 1'b1;
		end
		else begin
			ckec <= ckec + 1'b1;
			cke <= 1'b0;
		end
    end

	always @(posedge CLK_IN)begin
		if(cke == 1'b1 & RST_N==0)begin
			count1 <= 10'b0;
			count2 <= 10'b0;
			rled <= 3'b110;
            dir <= 1'b0;
		end

		// 1usクロックで０〜９９９（time1）までカウント
		if(cke == 1'b1)
		begin
			if(count1 == time1)
	 		begin 
	 			count1<= 10'd0;
	 		end
	 		else begin
	 			count1 <= count1 + 1'b1;
			end
	 	end

		// count1の１周期で０〜９９９（time2）までカウント
		if(cke == 1'b1 & count1 == time1)
			begin
				if(count2 == time2)
		 		begin 
		 			count2<= 10'd0;
					rled <= dir ? {rled[1:0],rled[2]} : {rled[0],rled[2:1]} ;
		 		end
		 		else
		 			count2 <= count2 + 1'b1;
		 	end

		// SWのチャタリング除去
		if( cke == 1'b1 & count1 == time1 )
			begin
				dsw[3:1] <= dsw[2:0];
                dsw[0]   <= SW;
		 	end

		// SWが押されているときにはdirを反転
		if( cke == 1'b1 & count1 == time1 )
			begin
				if( dsw == 4'b1100 )
		 			dir <= dir ? 1'b0 : 1'b1 ;
		 		else
		 			dir <= dir ;
		 	end

		// LEDを駆動するPWM信号生成
		if(cke == 1'b1)
		begin
			if(count2 < time2/2)
				duty = count2 * 2;
			else 
				duty = (time2 - count2) * 2;
	
			if(count1 < duty)
				rledout = rled;
			else
				rledout = 3'b111;

		end
	end

	assign RGB_LED[0] = rledout[0];
	assign RGB_LED[1] = rledout[1];
	assign RGB_LED[2] = rledout[2];

endmodule

$ sudo modprobe -r ftdi_sio