--- Quote Start ---
Replace always @ ( clk or in_port)
with always @ (posedge clk)
You may also need to change further, if you want the counter to increment only once when you push the switch: now it keeps on increasing at the clk rate as long as you keep the switch pressed.
--- Quote End ---
Thank you for your reply.
Sorry, I try your suggestion,but it get the incorrect result.
I don't know whether I misunderstanding your suggestion.
I replace always @ ( clk or in_port)
with always @ (posedge clk)
In the normal case, when I press the switch, the counter will be increased once.
However the experimental result shows the counter's number is a random number.
The following is my experimental setting
The initial the setting in_port = 8'b0000_0000
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 0
--- Quote End ---
next, I press the switch, I think the in_port = 8'b1000_0000
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 208 (I want the count is 0)
--- Quote End ---
next, I keep on the switch pressed, the in_port = 8'b1000_0000
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 30 (I want the count is 0)
--- Quote End ---
next, I keep on the switch pressed, the in_port = 8'b1000_0000
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 93 (I want the count is 0)
--- Quote End ---
next, I press another switch, the in_port = 8'b1000_0010
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 93 (I want the count is 1)
--- Quote End ---
next, I keep on switch pressed , the in_port = 8'b1000_0010
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 93 (I want the count is 1)
--- Quote End ---
next, I release the switch, the in_port = 8'b1000_0000 (It will start to get the random number)
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 43 (I want the count is 1)
--- Quote End ---
next, I keep on the original switch pressed, the in_port = 8'b1000_0000
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 58 (I want the count is 1)
--- Quote End ---
next, I press another switch, the in_port = 8'b1000_0010
,then the count shows number in NIOSII console with NIOS IDE
--- Quote Start ---
count is 58 (I want the count is 2)
--- Quote End ---
Therefore I am almost crazy.
I don't know why I can get this result.
I replace always @ ( clk or in_port)
with always @ (in_port)
Let the command is executed in "always block" when the in_port changed.
But the result is the same totally.
Honored Contributor
