//-------------------------------------------------------------------------------
// top.v
//-------------------------------------------------------------------------------
module top
(
input wire CLK_PCB,
input wire nRST_PCB,
input wire ROAD_DET,
output wire ROAD_RED,
output wire ROAD_YELLOW,
output wire ROAD_GREEN,
input wire PED_BUTT,
output wire PED_RED,
output wire PED_GREEN,
output wire [3:0] LED
);
wire CLK = CLK_PCB;
wire RST = ~nRST_PCB;
// heartbeat dla LED
reg [31:0] heartbeat_clk;
always @(posedge CLK or posedge RST) begin
if (RST) heartbeat_clk <= 0;
else heartbeat_clk <= heartbeat_clk + 1;
end
assign LED = ~{ ROAD_DET, PED_BUTT, RST, heartbeat_clk[27] };
wire buzz_unused;
automat #(
.TICK_LENGTH(50000-1)
) u_automat (
.RST (RST),
.CLK (CLK),
.P_P (PED_BUTT),
.CAR (ROAD_DET),
.CR (ROAD_RED),
.CY (ROAD_YELLOW),
.CG (ROAD_GREEN),
.PR (PED_RED),
.PG (PED_GREEN),
.BUZZ (buzz_unused)
);
endmodule
//-------------------------------------------------------------------------------
// automat.v
//-------------------------------------------------------------------------------
module automat #(
parameter TICK_LENGTH = 50000-1 // liczba taktów na 1 sekundę
)(
input wire RST,
input wire CLK,
input wire P_P,
input wire CAR,
output wire CR,
output wire CY,
output wire CG,
output wire PR,
output wire PG,
output wire BUZZ
);
reg [31:0] COUNT_SEC;
reg [31:0] COUNT;
reg [2:0] NEXT_STATE;
always @(posedge CLK or posedge RST) begin
if (RST) begin
COUNT_SEC <= TICK_LENGTH;
COUNT <= 5;
NEXT_STATE <= 1;
end else begin
if (COUNT_SEC == 0) begin
COUNT_SEC <= TICK_LENGTH;
if (COUNT == 0) begin
COUNT <= 5;
NEXT_STATE <= (NEXT_STATE == 7) ? 1 : NEXT_STATE + 1;
end else begin
COUNT <= COUNT - 1;
end
end else begin
COUNT_SEC <= COUNT_SEC - 1;
end
end
end
wire [2:0] STATE = NEXT_STATE;
// Przekazujemy COUNT i COUNT_SEC dalej, żeby można było miganie
stan2LED #(.TICK_LENGTH(TICK_LENGTH)) s2l (
.STATE (STATE),
.COUNT (COUNT),
.COUNT_SEC (COUNT_SEC),
.CR (CR),
.CY (CY),
.CG (CG),
.PR (PR),
.PG (PG),
.BUZZ (BUZZ)
);
endmodule
//-------------------------------------------------------------------------------
// stan2LED.v
//-------------------------------------------------------------------------------
module stan2LED #(
parameter TICK_LENGTH = 50000-1
)(
input wire [2:0] STATE,
input wire [31:0] COUNT,
input wire [31:0] COUNT_SEC,
output reg CR,
output reg CY,
output reg CG,
output reg PR,
output reg PG,
output reg BUZZ
);
// połowa sub-sekundy dla migania
localparam HALF_TICK = (TICK_LENGTH >> 1);
always @(*) begin
CR = 0;
CY = 0;
CG = 0;
PR = 0;
PG = 0;
BUZZ = 0;
case (STATE)
1: begin
CR = 1; PR = 1;
end
2: begin
CR = 1; CY = 1; PR = 1;
end
3: begin
CG = 1; PR = 1;
end
4: begin
CY = 1; PR = 1;
end
5: begin
CR = 1; PR = 1;
end
6: begin
// stan „piesi zielone”:
CR = 1;
if (COUNT > 1) begin
// zwykłe zielone
PG = 1;
end else begin
// ostatnia sekunda – miganie 0.5s ON/OFF
PG = (COUNT_SEC > HALF_TICK) ? 1 : 0;
end
end
7: begin
CR = 1;
BUZZ = 1;
end
default: begin
// (STATE==0) – nic się nie świeci
end
endcase
end
endmodule