Porting code to gcc, replacement for SFR?
Fri Nov 7 03:55:00 GMT 1997
If I understand "The Explicit reg vars" correctly, this allows you to access
the internal registers which are addressed by name in assembler, eg. r1. If
I understand this correctly, it doesn't allow you to specify a memory mapped
register. Is this correct? If this allows you to specify a memory mapped
register, how do I implement it?
> Roy> The code makes use of an IAR specific type called sfr - special function
> Roy> register. Does anyone know of a similar type in gcc, or an easy way to
> Roy> implement a similar type?
> Roy> A special function register is something like a UART control
> Roy> is at a predetermined address and can read/written to as a byte or as
> Roy> individual bits.
>GCC allows you to specify for a variable what machine register it
>should live in, I expect that that will do what you want. The
>relevant technique is explained in the GCC documentation. The info
>nnode you want is titled "Explicit Reg Vars".
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