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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
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12 years ago

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IO_PIO_SMER = IO_PIO base address + 1

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You might want to try IO_PIO_SMER = IO_PIO base address + 4 instead. The hardware documentation usually talks about offsets for 32-bit registers, while the address used in software is in a 8-bit space. You need to jump 4 bytes to get to the next offset.