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decade_counter.sv
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module decade_counter(
input rst_n,
input sw_mode, // sw = switch
input sw_speed,
input clk,
input butt_increase, // butt = button (p33 user_man)
input butt_decrease, // butt press = 0, release = 1
input butt_change,
output reg led17, // led0 and led1 to show the state
output reg led14,
output reg led10,
output logic [6:0] seg0,
output logic [6:0] seg1,
output logic [6:0] seg2,
output logic [6:0] seg3,
output logic [6:0] seg4,
output logic [6:0] seg5,
output logic [6:0] seg6,
output logic [6:0] seg7);
/************* CLOCK CONTROL ****************/
// core clock
reg tick_1s;
delay #(26'd49_999_999,26) delay1s ( .delay(tick_1s),
.reset_n(rst_n),
.CLOCK_50MHZ(clk),
.en(1));
reg tick_0_1s;
delay #(26'd499,26) delay_half_s ( .delay(tick_0_1s),
.reset_n(rst_n),
.CLOCK_50MHZ(clk),
.en(1));
wire tick;
assign tick = (sw_speed) ? tick_0_1s : tick_1s;
// button clock
reg tick_change;
delay #(26'd24_999_999,26) delay_change ( .delay(tick_change),
.reset_n(rst_n),
.CLOCK_50MHZ(clk),
.en(~butt_change));
reg tick_up;
delay #(26'd12_499_999,26) delay_tickup ( .delay(tick_up),
.reset_n(rst_n),
.CLOCK_50MHZ(clk),
.en(~butt_increase));
reg tick_down;
delay #(26'd12_499_999,26) delay_tickdn ( .delay(tick_down),
.reset_n(rst_n),
.CLOCK_50MHZ(clk),
.en(~butt_decrease));
/************* SINGLE DIGITS ****************/
reg [3:0] sec1;
reg [3:0] sec0;
reg [3:0] min1;
reg [3:0] min0;
reg [3:0] hour1;
reg [3:0] hour0;
reg [3:0] day1;
reg [3:0] day0;
reg [3:0] month1;
reg [3:0] month0;
reg [3:0] year3;
reg [3:0] year2;
reg [3:0] year1;
reg [3:0] year0;
/************* DISPLAY TO 7SEG ***************/
display_to_7seg st7s ( // Input
.clk(clk), .sw_mode(sw_mode),
.day1(day1), .day0(day0),
.month1(month1), .month0(month0),
.year3(year3), .year2(year2), .year1(year1), .year0(year0),
.hour1(hour1), .hour0(hour0),
.min1(min1), .min0(min0),
.sec1(sec1), .sec0(sec0),
// Output
.seg7(seg7),
.seg6(seg6),
.seg5(seg5),
.seg4(seg4),
.seg3(seg3),
.seg2(seg2),
.seg1(seg1),
.seg0(seg0));
// button
reg [1:0] state;
// assign state = (tick_change) ? ((state == 2'b11) ? 2'b00 : (state + 2'b01)) : (state + 2'b00);
always @(posedge clk or negedge rst_n)
begin
if (!rst_n)
begin
state <= 2'd0;
end
else if (tick_change)
begin
state <= state + 1;
end
end
reg led17_;
reg led14_;
reg led10_;
assign led17 = led17_;
assign led14 = led14_;
assign led10 = led10_;
initial state = 2'b00;
/************** DIGITAL CLOCK'S LOGIC ****************/
reg dayChange;
reg monthChange;
reg yearChange;
assign yearChange = ((month1 == 4'd2) && (month0 == 4'd1) && (day1 == 4'd1) && (day0 == 4'd3));
assign dayChange = ((hour1 == 4'd2) && (hour0 == 4'd3) &&
(min1 == 4'd5) && (min0 == 4'd9) &&
(sec1 == 4'd5) && (sec0 == 4'd9) &&
(tick));
reg leapYear;
assign leapYear = (
(
((year1[0] == 1'b0) && ((year0 == 4'b0000) || // year1 even
(year0 == 4'b0100) || // so y0 is 0, 4, 8
(year0 == 4'b1000)))||
((year1[0] == 1'b1) && ((year0 == 4'b0010) || // year1 odd
(year0 == 4'b0110))) // so y0 is 2, 6
) &&
((year1 != 4'b0000) && (year0 != 4'b0000))); // not divide_able to 100
always @(posedge clk or negedge rst_n)
begin
if (~rst_n)
begin
// 00:00:00xx
hour1 <= 4'b0000; // 0
hour0 <= 4'b0000; // 0
min1 <= 4'b0000; // 0
min0 <= 4'b0000; // 0
sec1 <= 4'b0000; // 0
sec0 <= 4'b0000; // 0
// 01:01:2024
day1 <= 4'b0000; // 0
day0 <= 4'b0001; // 1
month1 <= 4'b0000; // 0
month0 <= 4'b0001; // 1
year3 <= 4'b0010; // 2
year2 <= 4'b0000; // 0
year1 <= 4'b0010; // 2
year0 <= 4'b0100; // 4
end
else
begin
// TIME BLOCK
case (state) // set time
2'b01 : // second
begin
if(~sw_mode)
begin
if (tick_up)
begin
if (sec0 == 4'd9)
begin
sec0 <= 4'd0;
if (sec1 == 4'd5)
begin
sec1 <= 4'd0;
end
else
begin
sec1 <= sec1 + 4'd1;
end
end
else
begin
sec0 <= sec0 + 4'd1;
end
end
else if (tick_down)
begin
if (sec0 == 4'd0)
begin
sec0 <= 4'd9;
if(sec1 == 4'd0)
begin
sec1 <= 4'd5;
end
else
begin
sec1 <= sec1 - 4'd1;
end
end
else
begin
sec0 <= sec0 - 4'd1;
end
end
else
begin
sec1 <= sec1 + 4'd0;
sec0 <= sec0 + 4'd0;
end
// display red led for state
led17_ <= 1'd0;
led14_ <= 1'd0;
led10_ <= 1'd1;
end
end
2'b10 : // minute
begin
if(~sw_mode)
begin
if (tick_up)
begin
if (min0 == 4'd9)
begin
min0 <= 4'd0;
if (min1 == 4'd5)
begin
min1 <= 4'd0;
end
else
begin
min1 <= min1 + 4'd1;
end
end
else
begin
min0 <= min0 + 4'd1;
end
end
else if (tick_down)
begin
if (min0 == 4'd0)
begin
min0 <= 4'd9;
if(min1 == 4'd0)
begin
min1 <= 4'd5;
end
else
begin
min1 <= min1 - 4'd1;
end
end
else
begin
min0 <= min0 - 4'd1;
end
end
else
begin
min1 <= min1 + 4'd0;
min0 <= min0 + 4'd0;
end
// display red led for state
led17_ <= 1'd0;
led14_ <= 1'd1;
led10_ <= 1'd0;
end
end
2'b11 : // hour
begin
if(~sw_mode)
begin
if (tick_up)
begin
if ((hour0 == 4'd3) && (hour1 == 4'd2)) begin
hour1 <= 4'd0;
hour0 <= 4'd0;
end
else if (hour0 == 4'd9)
begin
hour1 <= hour1 + 4'd1;
hour0 <= 4'd0;
end
else
begin
hour0 <= hour0 + 4'd1;
end
end
else if (tick_down)
begin
if ((hour0 == 4'd0) && (hour1 == 4'd0))
begin
hour1 <= 4'd2;
hour0 <= 4'd3;
end
else if (hour0 == 4'd0)
begin
hour1 <= hour1 - 4'd1;
hour0 <= 4'd9;
end
else
begin
min0 <= min0 - 4'd1;
end
end
else
begin
hour1 <= hour1 + 4'd0;
hour0 <= hour0 + 4'd0;
end
// display red led for state
led17_ <= 1'd1;
led14_ <= 1'd0;
led10_ <= 1'd0;
end
end
default :
begin
if (tick)
begin
// Check TIME'S double digits value first!
if ((hour1 == 4'd2) && (hour0 == 4'd3) &&
(min1 == 4'd5) && (min0 == 4'd9) &&
(sec1 == 4'd5) && (sec0 == 4'd9))
begin
if (day0 == 4'd1001)
begin
// Increasement of day1
day1 <= day1 + 4'd1;
day0 <= 4'd0;
end
else
begin
// Increasement of day0
day0 <= day0 + 4'd1;
end
hour1 <= 4'd0;
hour0 <= 4'd0;
min1 <= 4'd0;
min0 <= 4'd0;
sec1 <= 4'd0;
sec0 <= 4'd0;
end
else if ((min1 == 4'd5) && (min0 == 4'd9) &&
(sec1 == 4'd5) && (sec0 == 4'd9) &&
(hour0 == 4'd9))
begin
// Increasement of hour1
hour1 <= hour1 + 4'd1;
hour0 <= 4'd0;
min1 <= 4'd0;
min0 <= 4'd0;
sec1 <= 4'd0;
sec0 <= 4'd0;
end
else if ((min1 == 4'd5) && (min0 == 4'd9) &&
(sec1 == 4'd5) && (sec0 == 4'd9))
begin
// Increasement of hour0
hour0 <= hour0 + 4'd1;
min1 <= 4'd0;
min0 <= 4'd0;
sec1 <= 4'd0;
sec0 <= 4'd0;
end
else if ((sec1 == 4'd5) && (sec0 == 4'd9) &&
(min0 == 4'd9))
begin
// Increasement of min1
min1 <= min1 + 4'd1;
min0 <= 4'd0;
sec1 <= 4'd0;
sec0 <= 4'd0;
end
else if ((sec1 =='b0101) && (sec0 == 4'b1001))
begin
// Increasement of min0
min0 <= min0 + 4'd1;
sec1 <= 4'd0;
sec0 <= 4'd0;
end
else if ((sec0 == 4'b1001))
begin
// Increasement of sec1
sec1 <= sec1 + 4'd1;
sec0 <= 4'd0;
end
else
begin
// Increasement of sec0
sec0 <= sec0 + 4'd1;
end
end
// display red led for state
led17_ <= 1'd0;
led14_ <= 1'd0;
led10_ <= 1'd0;
end
endcase
// DATE BLOCK
case (state) // set date
2'b01 :
begin // Year
if(sw_mode)
begin
if ( (yearChange == 1'b1) )
begin
if ({year3, year2, year1, year0} == 16'b1001_1001_1001_1001) // 9999
begin
year0 <= 4'd0;
year1 <= 4'd0;
year2 <= 4'd0;
year3 <= 4'd0;
end
else if ({year2, year1, year0} == 12'b1001_1001_1001) // ~999
begin
year3 <= year3 + 4'd1;
year2 <= 4'd0;
year1 <= 4'd0;
year0 <= 4'd0;
end
else if ({year1, year0} == 8'b1001_1001) // ~~99
begin
year2 <= year2 + 4'd1;
year1 <= 4'd0;
year0 <= 4'd0;
end
else if ({year0} == 4'b1001) // ~~~9
begin
year1 <= year1 + 4'd1;
year0 <= 4'd0;
end
end
// display red led for state
led17_ <= 1'd1;
led14_ <= 1'd0;
led10_ <= 1'd0;
end
end
2'b10 :
begin // month
if(sw_mode)
begin
/* code */
// display red led for state
led17_ <= 1'd0;
led14_ <= 1'd1;
led10_ <= 1'd0;
end
end
2'b11 :
begin // day
if(sw_mode)
begin
// display red led for state
led17_ <= 1'd0;
led14_ <= 1'd0;
led10_ <= 1'd1;
end
end
default :
begin
if ( (dayChange == 1'b1) && ({year2, year1, year0} == 12'b1001_1001_1001) // ~999
&& ({month1, month0} == 8'b0001_0010) // December
&& ({day1, day0} == 8'b0011_0001)) // 31st
begin
// Increasemetn of year3
if (year3 == 4'd9) // Incase 9999 appear
begin
year3 <= 0;
end
else
begin
year3 <= year3 + 4'd1;
end
year2 <= 4'd0;
year1 <= 4'd0;
year0 <= 4'd0;
// 01:01:xxxx
day1 <= 4'd00;
day0 <= 4'd01;
month1 <= 4'd00;
month0 <= 4'd01;
end
else if ( (dayChange == 1'b1) && ({year1, year0} == 8'b1001_1001) // ~~99
&& ({month1, month0} == 8'b0001_0010) // December
&& ({day1, day0} == 8'b0011_0001)) // 31st
begin
// Increasemetn of year2
year2 <= year2 + 4'd1;
year1 <= 4'd0;
year0 <= 4'd0;
day1 <= 4'd00;
day0 <= 4'd01;
month1 <= 4'd00;
month0 <= 4'd01;
end
else if ( (dayChange == 1'b1) && ({year0} == 4'b1001) // ~~~9
&& ({month1, month0} == 8'b0001_0010) // December
&& ({day1, day0} == 8'b0011_0001)) // 31st
begin
// Increasemetn of year1
year1 <= year1 + 4'd1;
year0 <= 4'd0;
day1 <= 4'd00;
day0 <= 4'd01;
month1 <= 4'd00;
month0 <= 4'd01;
end
else if ( (dayChange == 1'b1) && ({month1, month0} == 8'b00010010) // December
&& ({day1, day0} == 8'd49)) // 31st
begin
// Increasemetn of year0
year0 <= year0 + 4'd1;
day1 <= 4'd00;
day0 <= 4'd01;
month1 <= 4'd00;
month0 <= 4'd01;
end
// Month that have 31 days
else if ((dayChange == 1'b1) && (({month1, month0} == 8'b00000001) || // Jan
({month1, month0} == 8'b00000011) || // Mar
({month1, month0} == 8'b00000101) || // May
({month1, month0} == 8'b00000111) || // Jul
({month1, month0} == 8'b00001000) || // Aug
({month1, month0} == 8'b00010000) )) // Oct
begin
if (({day1, day0} == 8'b00110001)) // 31
begin
// month1 is not need to change here
month0 <= month0 + 4'd1;
day1 <= 4'd0;
day0 <= 4'd1;
end
end
else if ((dayChange == 1'b1) && (({month1, month0} == 8'b00000100) || // Apr
({month1, month0} == 8'b00000110) || // Jun
({month1, month0} == 8'b00001001) || // Sep
({month1, month0} == 8'b00010001) )) // Nov
begin
if (({day1, day0} == 8'b00110000)) // 30
begin
if (month0 == 4'b1001) // Sep require process of month1
begin
month1 <= 4'd1; // Resault: Oct
month0 <= 4'd0;
end
else
begin
month0 <= month0 + 4'd1;
end
day1 <= 4'd0;
day0 <= 4'd1;
end
end
else if ((dayChange == 1'b1) && ({month1, month0} == 8'b00000010)) // Feb
begin
if ((leapYear) && ({day1, day0} == 8'b00101001)) // 29th
begin
month0 <= month0 + 4'd1;
day1 <= 4'd0;
day0 <= 4'd1;
end
else if ((!leapYear) &&{day1, day0} == 8'b00101000) // 28th
begin
month0 <= month0 + 4'd1;
day1 <= 4'd0;
day0 <= 4'd1;
end
end
// display red led for state
led17_ <= 1'd0;
led14_ <= 1'd0;
led10_ <= 1'd0;
end
endcase
end
end
endmodule
/*****************************************************************************************
7 SEGMENT DECODER
*****************************************************************************************/
module bin_to_7seg(
input [3:0] bcd,
output logic [6:0] seg7
);
// seven segggggment display
always @(bcd)
begin
case(bcd)
4'd0: seg7 <= ~7'b0111111;
4'd1: seg7 <= ~7'b0000110;
4'd2: seg7 <= ~7'b1011011;
4'd3: seg7 <= ~7'b1001111;
4'd4: seg7 <= ~7'b1100110;
4'd5: seg7 <= ~7'b1101101;
4'd6: seg7 <= ~7'b1111101;
4'd7: seg7 <= ~7'b0000111;
4'd8: seg7 <= ~7'b1111111;
4'd9: seg7 <= ~7'b1101111;
default : seg7 <= ~7'b0000000;
endcase
end
endmodule : bin_to_7seg
/*****************************************************************************************
DELAY
*****************************************************************************************/
module delay #(parameter COUNT = 26'd49_999_999,
parameter COUNTW = 26)
(delay, reset_n, CLOCK_50MHZ, en);
output reg delay;
input CLOCK_50MHZ;
input reset_n; // reset_n active low
input en; // enable clock signal active low
reg [COUNTW - 1 : 0] count;
always @(posedge CLOCK_50MHZ or negedge reset_n)
begin
if(!reset_n)
begin
count <= 0;
end
else if (count == COUNT)
begin
count <= 1'd0;
end
else if (en)
begin
count <= count + 1;
end
end
assign delay = count == COUNT;
endmodule : delay
/*****************************************************************************************
DISPLAY TO 7SEG
*****************************************************************************************/
module display_to_7seg (
input clk, // Clock
input sw_mode, // Switch mode between date/time
input day1, day0, month1, month0, year3, year2, year1, year0,
input hour1, hour0, min1, min0, sec1, sec0,
output seg7,
output seg6,
output seg5,
output seg4,
output seg3,
output seg2,
output seg1,
output seg0
);
logic [7:0][6:0] calendar_dis;
logic [7:0][6:0] clock_dis;
logic [7:0][3:0] calendar_bin;
logic [7:0][3:0] clock_bin;
assign calendar_bin = {day1, day0, month1, month0, year3, year2, year1, year0};
assign clock_bin = {hour1, hour0, min1, min0, sec1, sec0, 4'b1110, 4'b1110};
bin_to_7seg day1_dis (.bcd(calendar_bin[7]), .seg7(calendar_dis[7]));
bin_to_7seg day0_dis (.bcd(calendar_bin[6]), .seg7(calendar_dis[6]));
bin_to_7seg month1_dis (.bcd(calendar_bin[5]), .seg7(calendar_dis[5]));
bin_to_7seg month0_dis (.bcd(calendar_bin[4]), .seg7(calendar_dis[4]));
bin_to_7seg year3_dis (.bcd(calendar_bin[3]), .seg7(calendar_dis[3]));
bin_to_7seg year2_dis (.bcd(calendar_bin[2]), .seg7(calendar_dis[2]));
bin_to_7seg year1_dis (.bcd(calendar_bin[1]), .seg7(calendar_dis[1]));
bin_to_7seg year0_dis (.bcd(calendar_bin[0]), .seg7(calendar_dis[0]));
bin_to_7seg hour1_dis (.bcd(clock_bin[7]), .seg7(clock_dis[7]));
bin_to_7seg hour0_dis (.bcd(clock_bin[6]), .seg7(clock_dis[6]));
bin_to_7seg min1_dis (.bcd(clock_bin[5]), .seg7(clock_dis[5]));
bin_to_7seg min0_dis (.bcd(clock_bin[4]), .seg7(clock_dis[4]));
bin_to_7seg sec1_dis (.bcd(clock_bin[3]), .seg7(clock_dis[3]));
bin_to_7seg sec0_dis (.bcd(clock_bin[2]), .seg7(clock_dis[2]));
bin_to_7seg blk1_dis (.bcd(clock_bin[1]), .seg7(clock_dis[1]));
bin_to_7seg blk0_dis (.bcd(clock_bin[0]), .seg7(clock_dis[0]));
always_comb
begin
if (~sw_mode)
begin
seg7 = clock_dis[7];
seg6 = clock_dis[6];
seg5 = clock_dis[5];
seg4 = clock_dis[4];
seg3 = clock_dis[3];
seg2 = clock_dis[2];
seg1 = clock_dis[1];
seg0 = clock_dis[0];
end
else
begin
seg7 = calendar_dis[7];
seg6 = calendar_dis[6];
seg5 = calendar_dis[5];
seg4 = calendar_dis[4];
seg3 = calendar_dis[3];
seg2 = calendar_dis[2];
seg1 = calendar_dis[1];
seg0 = calendar_dis[0];
end
end
endmodule : display_to_7seg