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mapping SFR space

How would I locate a structure to coincide with the beginning of SFR space for the 8051? address 0x80 of directly assessible data memory.

We are using a core8051 (inside an FPGA), and the core8051 lets us map external events to SFR space. So it would be very convienent to define a structure which allows us to more easily access all of SFR space. (we take care not to "stomp" on already defined SFR registers.

How can I do that?

Thanks

Parents

0 Jon Ward over 19 years ago in reply to Eddie Weigle

Then a FIFO may be the fastest way to read the data. And, you don't need to worry with indexing thru SFRs. For example:

sfr FIFO_RESET = 0x??;
sfr FIFO_READ  = 0x??;

unsigned char xdata buffer [0x2000];

void func (void)
{
unsigned char xdata *bp;

FIFO_RESET = 1;
for (bp=buffer;
     bp < &buffer[sizeof(buffer)];
         *bp++ = FIFO_READ);
}

Jon

Reply

0 Jon Ward over 19 years ago in reply to Eddie Weigle

Then a FIFO may be the fastest way to read the data. And, you don't need to worry with indexing thru SFRs. For example:

sfr FIFO_RESET = 0x??;
sfr FIFO_READ  = 0x??;

unsigned char xdata buffer [0x2000];

void func (void)
{
unsigned char xdata *bp;

FIFO_RESET = 1;
for (bp=buffer;
     bp < &buffer[sizeof(buffer)];
         *bp++ = FIFO_READ);
}

Jon

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