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Altera_Forum
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15 years ago

PIO set and clear bits

Hi! I am using a Nios II in my Cyclone II FPGA. I configured the Nios with a 18bit output-PIO. When i use the macro IOWR_ALTERA_AVALON_PIO_DATA() i can easily turn my leds on and off. Looking ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

Hi Cris!

Yes, now it works (The macros IOWR_ALTERA_AVALON_PIO_SET_BITS() and

IOWR_ALTERA_AVALON_PIO_CLEAR_BITS() work). After i have recreated my nios with sopc builder from scratch it suddenly worked. No change to my c-code. My pio still has a width of 18 bit.

Just to sum it up for the thread followers:

The macros IOWR_ALTERA_AVALON_PIO_SET_BITS() and

IOWR_ALTERA_AVALON_PIO_CLEAR_BITS() did not work because i missed to enable the individual bit setting/clearing when i set up the pio in the sopc builder. After enabling it and a nios rebuild the macros work fine.

Thanks for that advice Cris!

Best regards

FredFlintstone