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Copy pathAquaSmart.v
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AquaSmart.v
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module smart_aqua(
input clk,
input reset,
input Liters5,
input Liters10,
input [1:0] in,
output reg out1,
output reg out2,
output reg [3:0] change,
output reg [2:0] Digit0,
output reg [2:0] Digit1
);
parameter state0 = 2'b00;
parameter state1 = 2'b01;
parameter state2 = 2'b10;
parameter state3 = 2'b11;
parameter state4 = 3'b101;
reg [1:0] c_state, n_state;
always @(posedge clk or posedge reset) begin
if (reset) begin
c_state <= state0;
n_state <= state0;
out1 <= 0;
out2 <= 0;
change <= 4'b0000;
Digit0 <= 3'b000;
Digit1 <= 3'b000;
end else begin
c_state <= n_state;
end
if (Liters5) begin
case(c_state)
state0: begin
if (in == 2'b00) begin
n_state <= state0;
out1 <= 0;
change <= 4'b0000;
end else if (in == 2'b01) begin
n_state <= state1;
out1 <= 0;
change <= 4'b0000;
end else if (in == 2'b10) begin
n_state <= state2;
out1 <= 0;
change <= 4'b0000;
end
end
state1: begin
if (in == 2'b00) begin
n_state <= state0;
out1 <= 0;
change <= 4'b0001; // Change = 5 Rs
end else if (in == 2'b01) begin
n_state <= state2;
out1 <= 0;
change <= 4'b0000;
end else if (in == 2'b10) begin
n_state <= state0;
out1 <= 1;
change <= 4'b0000; // Complete transaction
end
end
state2: begin
if (in == 2'b00) begin
n_state <= state0;
out1 <= 0;
change <= 4'b0010; // Change = 10 Rs
end else if (in == 2'b01) begin
n_state <= state0;
out1 <= 1;
change <= 4'b0000; // Complete transaction
end else if (in == 2'b10) begin
n_state <= state0;
out1 <= 1;
change <= 4'b0001; // Change = 5 Rs
end
end
endcase
end
if (Liters10) begin
case(c_state)
state0: begin
if (in == 2'b00) begin
n_state <= state0;
out2 <= 0;
change <= 4'b0000;
end else if (in == 2'b01) begin
n_state <= state1;
out2 <= 0;
change <= 4'b0000;
end else if (in == 2'b10) begin
n_state <= state2;
out2 <= 0;
change <= 4'b0000;
end
end
state1: begin
if (in == 2'b00) begin
n_state <= state0;
out2 <= 0;
change <= 4'b0001; // Change = 5 Rs
end else if (in == 2'b01) begin
n_state <= state2;
out2 <= 0;
change <= 4'b0000;
end else if (in == 2'b10) begin
n_state <= state3;
out2 <= 0;
change <= 4'b0000;
end
end
state2: begin
if (in == 2'b00) begin
n_state <= state0;
out2 <= 0;
change <= 4'b0010; // Change = 10 Rs
end else if (in == 2'b01) begin
n_state <= state3;
out2 <= 0;
change <= 4'b0000;
end else if (in == 2'b10) begin
n_state <= state4;
out2 <= 0;
change <= 4'b0000;
end
end
state3: begin
if (in == 2'b00) begin
n_state <= state0;
out2 <= 0;
change <= 4'b0100; // Change = 15 Rs
end else if (in == 2'b01) begin
n_state <= state4;
out2 <= 0;
change <= 4'b0000;
end
end
endcase
end
end
endmodule