Verilog Code Error: Counter : Read and writer through PIO

Question

Hi, I am trying to read and write 8-bit Counter data Using Quartus and NIOS. In SOPC : I am assigning  PIO : 1-bit input for enable                                            PIO : 8-bit output for outmodule Counter_Top_Level_design
(
	input clk, rst_n,
	output wire[7:0] out
);
wire enable;
	always @ (posedge clk or negedge rst_n)
	begin
		if (~rst_n)
			out &lt;= 0;
		else if (enable == 1'b1)
			out &lt;= out + 1;
	end
NIOS_SYSTEM niosii_system_inst (
		.clk_clk           (clk ),					//        clk.clk
		.reset_reset_n     (rst_n ),					//      reset.reset_n
		.output_pio_export ( enable ),	// output_pio.export
		.counter_out_export (out)
	);
endmoduleI am getting an Error message : Error (10137): Verilog HDL Procedural Assignment error at Counter_Top_Level_design.v(11): object "out" on left-hand side of assignment must have a variable data typeError (10137): Verilog HDL Procedural Assignment error at Counter_Top_Level_design.v(13): object "out" on left-hand side of assignment must have a variable data type

vicky1 · Answer

Hi,output  port "out" must have reg data type so replace "output wire[7:0] out" with "output reg[7:0] out"Let me know if this has helped resolve the issue you are facing or if you need any further assistance.Best RegardsVikas Jathar (This message was posted on behalf of Intel Corporation)

ss5 · Answer

module Counter_Top_Level_design   
 (
  input clk,
  output reg[7:0] out
 );
always @(posedge clk) 
begin
 out &lt;= out + 1;
end
 
NIOS_SYSTEM niosii_system_inst (
		.clk_clk           (clk ),					//        clk.clk
		.reset_reset_n     (rst_n ),					//      reset.reset_n
		.counter_out_export (out)
	);
 
endmoduleI have assigned PIO (output):8 bit, its showing error. If i assign PIO (input):8 bit error not coming. But i want to read the counter data.

vicky1 · Answer

Hi,Have you resolved the issue?If not, please provide the project file if possible.Best RegardsVikas Jathar (This message was posted on behalf of Intel Corporation)