In contrast to the multiple UDP callbacks there's only one TCP callback so it easy to provide a wrapper for the C callback that pushes C parameters on the stack.
Now that we process incoming data from the main loop - and use 'buf' both for incoming and outgoing data we should of course make sure that we never trash the incoming data with outgoing data.
The C test program may serve as copy & paste templates so it should make clear that ip65_process() is supposed to be called pretty regularly. Additionally it isn't supposed to be called recursively meaning that recv callbacks need to return quickly and defer longer processing.
The IP5 usage of ld65 segments and zeropage variables was made compatible with cc65 C programs already a while ago. This commit is the next logical step which is to introduce the actual C interface to IP65.
IP65 for C programs shares the the ip65.lib / ip65_tcp.lib with IP65 for assembler programs. However the various libraries from the 'drivers' are not reused. Instead there's exactly one library for every target named ip65_<target>.lib. Those libraries contain only functions used by ip65.lib / ip65_tcp.lib.
TODOs:
- Introduce c64_timer.s and atr_timer.s.
- Add a C interface to the rest of the IP65 functionality (especially TCP).
Now that with Telnet65 there is a "real" application there's no point anymore in the
ip65demo.dsk. Therefore httpd.slotscan is now part of the ordinary ip65test.dsk.
Re-added VT100 test that was created for KIPPERTERM development. Not very usefully as-is but a good template for any offline VT100 rendering test/debugging.
Additionally the disk images were renamed to distinguish them from the disk images created in the apps directory.
The W5100 TCP driver is intentionally very similiar to the UDP driver. It comes with its own test program (again similiar to the UDP test program) and an extension to the communication peer program to support the test program.
In order to ease exploring the W5100 UDP driver a simple test program using it was added. Additionally a communication peer program was introduced. The latter builds as-is for Windows using i.e. the VC++ command line 'cl w5100_peer.c'.
The Apple 2 web server now uses the "combo" library and optionally uses a2_set_slot to scan all slots for the Ethernet card. Combining both with DHCP allows for complete auto configuration.
Up to now every IP65 library contained exactly one Ethernet driver. In scenarios without strict memory limitations I might however be benefitial to have an IP65 library containing all Ethernet drivers available for a given target.
The Ethernet hardware detection that was already present before is used in this scenario to try to initialize one Ethernet driver after the other until one succeeds. If all drivers fail to initialize the user gets informed as usual.
The WIZ811MJ driver was primarily introduced for orthogonality reasons. There are however at least two W5100-based prototypes for the C64 so it makes at least some sense. The name was chosen as sort of placeholder for "something containing a W5100 chip".
The HTTPD program seems to be the only one somewhat useful for demo purposes. So I added the option to build a "IP65demo" disk containing it for all supported Ethernet devices - currently for the Apple2 only.
* CS8900A
The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and removes received frames from the chip if there's no room to send frames.
* LAN91C96
The Contiki driver was used by IP65 more or less unchanged in the first place.
* W5100
The Contiki driver allows to adjust the chip base addr at runtime (which allows to support different slots in the Apple II) and stays clear from the W5100 hybrid mode. It presumes a fully functional W5100 register auto-increment and pre-calculates necessary W5100 frame buffer wrap-arounds and thus achieves the maximal 6502 <-> W5100 transfer speed.
- Added exit_to_basic symbol.
- Aligned linker config with C64 linker config.
- Made switch to lower charset compatible.
Allow all test programs to run with LANceGS card.
Aligned C64 input file name.
- Tab chars were partially used with the unusual width of two blanks. I removed them altogether.
- Line endings were inconsistent even iniside individual files. I normalized them.
- I introduced a consistent coding style regarding comment indenting and blank line usage.
- I removed trailing spaces.
- I removed newlines following unnamed labels.
- ...
- Simplify Makefile by allowing to use suffix '_tcp' to denote the requirement to link against TCP-capable IP65 lib.
- Remove 'test' or 'test_' prefix from test program names - every program in 'test' is a test program.
- Have some more test programs switch to lower case charset on the C64.
- I'm no Ruby guy so don't rely on Ruby for building disk images.
