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Altera_Forum
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20 years ago

Very simple question about PIO

typedef volatile struct { int np_piodata; // read/write, up to 32 bits int np_piodirection; // write/readable, up to 32 bits, 1->output bit int np_piointerruptmask; // write...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
20 years ago

Hi,

in general if you want learn something about the peripherials, you might want to read "Altera Embeeded Peripherals Handbook" (n2cpu_nii5v3.pdf).

However you should use inl(...) for reading and outl(...) for writing the hardware register.

Accessing the hardware register with such a structure is a "Nios speciality".