How to print Counter output in NIOS console ?

Question

Hello,

I have followed this topic Simulating Designs with Lower-Level Qsys Systems as example design.

But i want to read the counter incremented data in NIOS console. Please suggest me , how .

Shall i add PIO- 8-bit output in SOPC builder and whether it can be possible to read ? ?

a_x_h_75 · Answer

Yes - you can add another PIO - configured as an input - and connect your 'count'' output signal to it. You can then use an 'IORD' instruction to read the value of the port.Cheers,Alex

ss5 · Answer

Thanks for your response. Please check my NIOS_code. Without FOR LOOP, how should i run the counter module. #include "sys/alt_stdio.h"
#include "alt_types.h"
#include&lt;io.h&gt;
#include&lt;system.h&gt;
#include&lt;stdio.h&gt;
 
int main()
{
	int result,i;
	IOWR(ENABLE_BASE, 0, 0x0);		// Enable the counter
	alt_printf("Hello from Nios II!
");		// Send Hello World to the JTAG UART
	usleep(100);
	 
	for (i=0;i&lt;10000;i++)
 
	{
            result=IORD(COUNTER_OUT_BASE, 0);
		  printf("%d
",(result+i));
	}
//	IOWR(ENABLE_BASE, 0, 0x1);
	return 0;
}

ss5 · Answer

I am not sure whether my design flow is right ?Please suggest memodule counter                   ///SUB
 
(
	input clk, enable, rst_n,
	output  reg[7:0] count
);
 
	always @ (posedge clk or negedge rst_n)
	begin
		if (~rst_n)
			count &lt;= 0;
		else if (enable == 1'b1)
			count &lt;= count + 1;
	end
 
endmodule module Counter_Top_Level_design        ///TOP
 (
	input				clk,
	input				rst_n,
	output [7:0]	out
	
);
 
wire counter_enable;
 
counter counter_inst (
		.clk			( clk ),
		.rst_n		( rst_n ),
		.enable		( counter_enable ),
		.count		( out )
	);
 
// For simulation, use this instantiation:
NIOS_SYSTEM niosii_system_inst (
		.clk_clk           ( clk ),					//        clk.clk
		.reset_reset_n     ( rst_n ),					//      reset.reset_n
		.enable_external_connection_export ( counter_enable ),		// output_pio.export
		.cout_export ( count )
	);
endmoduleNIOS	int result,i;
	IOWR(ENABLE_BASE, 0, 0x0);		// Enable the counter
	alt_printf("Hello from Nios II!
");		// Send Hello World to the JTAG UART
	usleep(100);
	 
	for (i=0;i&lt;10000;i++)
 
	{
            result=IORD(COUNTER_OUT_BASE, 0);
		  printf("%d
",(result+i));
	}

a_x_h_75 · Answer

Your connection to 'cout_export' should be 'out', not count which doesn't exist in 'Counter_Top_Level_design' (only in 'counter').As for the Nios code - it looks fine.&gt;&gt;""Without FOR LOOP, how should i run the counter module.""Without knowing what you're trying to do I don't know what to suggest.Cheers,Alex

ss5 · Answer

Sorry :)As per your instruction i have modified the code.How to justify counter design is working or not ?I have attached the screenshot in that only FOR loop is increaming ,

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How to print Counter output in NIOS console ?

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