This is the first of many steps designed to reduce gint's reliance on
the FX9860G and FXCG50 macros by describing the compile target more
symbolically. The goal is to allow both for g3a compilation of fx-API
code and for a potential CP port.
* Honor dwindow settings immediately (avoids useless dline() calls)
* Bound to ymin/ymax instead of doing many useless cut computations
* Remove the need for floating-point operations and division
It used to be a flexible array member because in the old days fxconv
could only output a fixed set of bytes, so any referencing was out the
question. Nowadays fxconv can output pretty much anything. Separating
the data pointer will be useful for PythonExtra to expose it as a Python
bytes() or bytearray() object while using the gint API.
Instead of using GetKeyWait(), we directly call into an internal OS
function, which avoids the need to press a key before we can redraw over
the OS banner and VRAM when coming back. The disassembly to locate the
function was developed by Dr-Carlos.
We still have to redraw when coming back; getkey() will do it by
dupdate() by default, and it that's not a possibility for the
application an option to receive a special event and handle it manually
is provided.
This workaround using a gint_call_t with an odd address is not realy the
cleanest idea but it helps keep the existing intc_generic_handler in
the 32 bytes size limit of the VBR space.
This looks like it could work in the long term. The only issue that
really hasn't been addressed is how to use packet counters to cut
transactions when there's no ZLP, but we can leave that for later.
The previous scheme was really unclear. Now, an endpoint_t carries all
of the endpoint info (instead of the global address being implicitly
its array index, which couldn't be returned).
An _endpoint address_ is the 8-bit value consisting of an endpoint
number (bits 0x0f) and a direction (bit 0x80).
The _global address_ of an endpoint is the address used to communicate
with the host, and it is unique. The _local address_ of an endpoint is
the interface-specific numbering that gint provides to allow interfaces
to compose without risks of address collisions.
The complete data for an endpoint can be queried with the new functions
usb_get_endpoint_by_*() which accept global addresses, local addresses,
and pipe numbers.
* Clear pipes and FIFOs during world switches to avoid interference
with the OS. LINK uses pipes 3 and 4, and attempts to add a second
pipe to the fxlink interface (thus using pipe 4) would interfere with
LINK and somehow prevent the pipe from being used (Wireshark captures
showed no responses on that pipe). Forcing a blank state is a valid
move because that state occurs naturally after a RESET, thus LINK and
other add-ins must support it as well.
* Delay the application of configuration to the USB configuration stage
(specifically, the DVST configured interrupt, even though technically
we should do that in SET_CONFIGURATION 0). This is because we
previously relied on world switches preserving pipe settings (by not
changing them) to reconnect the gint driver after a world switch.
This is no longer possible as the world switch now clears the pipes.
The new timing makes the driver automatically re-configure as the
connection restarts.
