Page 208 - MDP2020-2

| 인천전자마이스터고등학교 ·············································································································
202

column2 : begin
case (key_row)
4'b0001 : key_data <= {4'b0010, i}; //key_2
4'b0010 : key_data <= {4'b0101, i}; //key_5
4'b0100 : key_data <= {4'b1000, i}; //key_8
4'b1000 : key_data <= {4'b0000, i}; //key_0
endcase
end
column3 : begin
case (key_row)
4'b0001 : key_data <= {4'b0011, i}; //key_3
4'b0010 : key_data <= {4'b0110, i}; //key_6
4'b0100 : key_data <= {4'b1001, i}; //key_9
4'b1000 : key_data <= {4'b1111, i}; //key_#
endcase
end
column4 : begin
case (key_row)
4'b0001 : key_data <= {4'b1010, i}; //key_A
4'b0010 : key_data <= {4'b1011, i}; //key_B
4'b0100 : key_data <= {4'b1100, i}; //key_C
4'b1000 : key_data <= {4'b1101, i}; //key_D
endcase
end
endcase
end
end

always @(posedge clk, negedge rst)
begin
if(!rst)
begin
i <= 0;
end
else
begin
case (key_row)
4'b0001 : i = i + 1;
4'b0010 : i = i + 1;
4'b0100 : i = i + 1;
4'b1000 : i = i + 1;
endcase
end
end
//assign led = ~key_data;
endmodule

module serial(clk, rst, tx_out, uart_rxd);