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Altera_Forum's avatar
Altera_Forum
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12 years ago

Bidirection port (PIO) in uClinux

Hi all, does somebody design and program, in which is using pio core in bidirection mode ? I need to communicate between two FPGAs with one control bus (in output pio mode) and bidirection ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
12 years ago

Finally I found that when i write "0" to ad[19] to pin88 of EP3C25Q240, system halted, so i discovered, that this pin can be use for sdram controller. I use sdram controller, but not this pin. Although it is strange, i changed the pin location from pin88 to pin126 and now it works in bidirection pio mode, too (communicate with second fpga).

In second, you are true, I had to write IO_PIO_SMER = IO_PIO base address + 4.

I dont understand why is problem when i write 0 to pin 88, but now it works.

Thank you for your advices.

Jan