參考來源 https://www.fpga4fun.com/Opto0.html
//=============================
//This makes the LED "glow".
// Note: Use a "clk" clock signal at around 20MHz.
//Otherwise the effect might be too slow or too fast to be appreciated.
//=============================
//需 Import pin assignments DE2_115_pin_assignments
/*
module LED_glow(clk, LED);
input clk;
output LED;
reg [23:0] cnt;
always @(posedge clk) cnt<=cnt+1;
wire [3:0] PWM_input = cnt[23] ? cnt[22:19] : ~cnt[22:19];
reg [4:0] PWM;
always @(posedge clk) PWM <= PWM[3:0]+PWM_input;
assign LED = PWM[4];
endmodule */
module LED_glow(
input CLOCK_50, // 50 MHz clock
input [3:0] KEY, // Pushbutton[3:0]
input [17:0] SW, // Toggle Switch[17:0]
output [6:0] HEX0,HEX1,HEX2,HEX3,HEX4,HEX5,HEX6,HEX7, // Seven Segment Digits
output [8:0] LEDG, // LED Green
output [17:0] LEDR, // LED Red
inout [35:0] GPIO_0,GPIO_1, // GPIO Connections
// LCD Module 16X2
output LCD_ON, // LCD Power ON/OFF
output LCD_BLON, // LCD Back Light ON/OFF
output LCD_RW, // LCD Read/Write Select, 0 = Write, 1 = Read
output LCD_EN, // LCD Enable
output LCD_RS, // LCD Command/Data Select, 0 = Command, 1 = Data
inout [7:0] LCD_DATA, // LCD Data bus 8 bits
input [2:0] mess, // MESSAGE STATUS (see lcd_test)
input [1:0] isServer // SERVER STATUS (see lcd_test)
);
// All inout port turn to tri-state
assign GPIO_0 = 36'hzzzzzzzzz;
assign GPIO_1 = 36'hzzzzzzzzz;
// turn LCD ON
assign LCD_ON = 1'b1;
assign LCD_BLON = 1'b1;
// blank unused 7-segment digits
assign HEX0 = 7'b111_1111;
assign HEX1 = 7'b111_1111;
assign HEX2 = 7'b111_1111;
assign HEX3 = 7'b111_1111;
assign HEX4 = 7'b111_1111;
assign HEX5 = 7'b111_1111;
assign HEX6 = 7'b111_1111;
assign HEX7 = 7'b111_1111;
reg [23:0] cnt;
always @(posedge CLOCK_50) cnt<=cnt+1;
wire [3:0] PWM_input = cnt[23] ? cnt[22:19] : ~cnt[22:19];
reg [4:0] PWM;
always @(posedge CLOCK_50) PWM <= PWM[3:0]+PWM_input;
assign LEDG[0] = PWM[4];
endmodule
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