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Addressing 8255

Murray R. Van Luyn

Hi,

I have a Philips RD2 board with a memory mapped 8255 with ports A at 8000H, B at 8001H, C at 8002H and a control port at 8003H.

How do I set up my defines so that I can just refer to these memory mapped ports as PORTA, CTRLPRT etc. in a C program?

Muz

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  • 0 in reply to erik malund

    Hi Erik,

    Thanks for the reply.

    Ah, I see. It's a RD and WR signal timing issue. Well the 8255's are on a commercially produced development board that I'm helpng a friend get started with. I guess they have any hardware signal timing issues sorted out in the design, so I won't bother with software delays then.

    Muz.

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  • 0 in reply to erik malund

    Hi Erik,

    Thanks for the reply.

    Ah, I see. It's a RD and WR signal timing issue. Well the 8255's are on a commercially produced development board that I'm helpng a friend get started with. I guess they have any hardware signal timing issues sorted out in the design, so I won't bother with software delays then.

    Muz.

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