RE: [lwip-users] lwIP on TI C55 processor

[Jamie Granger]

Chris,

Yes, the C55 does allow packing 8-bit values to/from 16-bit words as you
suggest.  This is all just 16-bit operations, and shifting and masking,
which are fine.  In fact there is a "char" type on the C55, but it is a
16-bit value which uses only the lower 8-bits.

So I think, in many places in lwip where an 8-bit pointer is used to
access memory, I would have to replace it with some packing/unpacking
similar to your example.  It looks like it might be a lot of work -
which is why I was asking if anyone's already done it.

Thanks,
Jamie



-----Original Message-----
Jamie,

Does the C55 provide any way of handling 8 bits, or of packing 16 bits
down to 8?

For instance:

int16 a,b,c;

        c = (a<<8) + (b & 0x00ff);

where the 8 bit values are the bottom 8 bits of the 16 bit a and b.

Much of the data encoding in TCP/IP etc is 8 bit values packed into 16
bit locations. If you can manage the pack and unpack, then there is
hope.

Regards,

Chris.
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