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Altera_Forum's avatar
Altera_Forum
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16 years ago

IORD IOWR macros vs. memory access to peripherals

What is the point of the IORD and IOWR macros? I can access my custom Avalon peripherals using them, but it seems like I can't access them like the following: volatile alt_u32 *DEV_PTR = DEV_...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
15 years ago

I can execute my program up to the IORD, but when it is execute the IORD line the progrma stop and return nothing. In the same time the signal tap run and I can see the chip_select, the readreq, the address and data signals: they are correct.

Why the read function fail?