Forum Discussion

Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 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
16 years ago

Hi Chris!

Ok, i checked this my system.h file:

Before enabling "Enable individual bit setting/clearing" ==># define PIO_0_BIT_MODIFYING_OUTPUT_REGISTER 0

Now after enabling "Enable individual bit setting/clearing" ==># define PIO_0_BIT_MODIFYING_OUTPUT_REGISTER 1

So the registers for setting and clearing the pio should be there...

> Did you try to set/clear a single bit instead of the complete 18bit pio?

Yes, i also tried this but it did not have any effect.

FredFlintstone