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Altera_Forum
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15 years ago

Push Buttons Adujusting Speed

So I'm using a DE2 board with NIOS and Quartus 9.1 and I'm trying to make a function to adjust the speed of packets sent over Ethernet as a modification of the DE2_NET sample. the problem is that whe...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I think this is a problem:

volatile int* button;

*button = IORD_ALTERA_AVALON_PIO_DATA(BUTTON_PIO_BASE);

You are using an uninitialized pointer which will corrupt memory somewhere.

The correct code is the one you commented out (but you need to define alt_u8 button, not alt_u8 *button).

Moreover, IMHO it was correct to test button switching edge instead of button status.

Now you always have delay=delayAmount=0 and whenever you press a button the function will keep on retriggering until you release it.