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Altera_Forum's avatar
Altera_Forum
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14 years ago

NIOS II PIO Data read problem

Hi All. I have some problems with data processing, based on NIOS core. My FPGA project includes external interface, strobe line (NIOS Internal interrupt or just Flag), 8 bit data input port and FI...
Altera_Forum's avatar
Altera_Forum
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14 years ago

First of all you must write ones, not zero, into edge capture register to reset status:

IOWR_ALTERA_AVALON_PIO_EDGE_CAP(STROBE_BASE, 1)

Anyway this seems to be irrelevant, unless you are using edge capture in another part of the code.

I guess your problem is that you can't get the correct pio status in 'data', isn't it?

This can be simply due to bad timing relative to strobe signal.