Where is Source/Documentation for W5100 Low Level Functions

Using Arduino Programming Questions
#1

I have just started working with Arduino; so, forgive my ignorance.

I am trying to do some atypical things over Ethernet. When I dig through the code, I can find the higher level library routines; but, I always dead end at a function like "W5100.writeSnDHAR" or some such.
I have performed complete searches of the entire "arduino" folder to no avail.

Where is the source code/documentation for these low level routines?

#2

Which library are you using ?

#3

Ethernet

#4
#5

Thanks, but I have already looked in those files. I have "grep'ed" the entire arduino folder and its subfolders.

It is possible that there is something fundamental about C++ that I don't understand - my experience is mostly in C.

I can't find the source/documentation for many of the low level routines for example:

In socket.cpp:
W5100.writeSnMR(s, protocol);
W5100.writeSnIR(s, 0xFF);
W5100.writeSnPORT(s, port);
W5100.writeSnDHAR(s, mac);
W5100.readSnRX_RD(s)

In W5100.h:
writeGAR(addr);
readSUBR(addr);
readSHAR(addr);

In W5100.cpp:
writeSnRX_SIZE(i, SSIZE >> 10);
writeSnTX_SIZE(i, SSIZE >> 10);
writeTMSR(0x55);
writeRMSR(0x55);

#6

It looks to me as though the stuff you're missing is in the .h file. You won't find it using grep though because there are a series of macro expansions creating those functions.

e.g.

__SOCKET_REGISTER8(SnMR,        0x0000)        // Mode

Generates writeSnMR(s, protocol);

I haven't seen the ##name construct before, but it seems pretty clear that that's what's doing it.

#7

If you REALLY want to understand how the W5100 library works, read the W5100 datasheet. The library is a very "thin" wrapper around the (very limited) chip functionality. The vast majority of the W5100 functionality is hard-wired into the chip itself.

Regards,
Ray L.

#8

See

https://gcc.gnu.org/onlinedocs/cpp/Concatenation.html#Concatenation

which says, in part:

"It is often useful to merge two tokens into one while expanding macros. This is called token pasting or token concatenation. The ‘##’ preprocessing operator performs token pasting."

This would be really tricky to search for using grep.

#9

Thanks, all. I did not even know that kind of macro functionality was possible. I was guessing that it was linking to a binary library or something. Now I have a path forward.

#10