Forum Discussion

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

2 Leds -> how many PIO?

Hi all, I'm writing a simple program on interrupt behaviour, with an interval timer (that generate timer interrupt and its handler make a ledg blink) and an hardware interrupt generated by a bu...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

If you configured your PIO for individual bit setting, you can possibly use these:

IOWR_ALTERA_AVALON_PIO_CLEAR_BITS(LED_PIO_BASE, led); // led on

IOWR_ALTERA_AVALON_PIO_SET_BITS(LED_PIO_BASE, led); // led off

led is the bit mask of the output(s) you want to set/clear:

1: for the first led

2: for the second led

3: for controlling both

Should you extend the PIO for more outputs, they would be controlled by next bits: 0x4, 0x8, 0x10, 0x20, ....