Mainly, this removes a lot of the logic from selectMapping by reusing the
copy already present in getMapping. As a result, selectMapping is not
expected to be accessed from outside this module anymore.
Also, this factorises several smaller chunks of code found throughout the
module.
Also, get rid of a few easy globals along the way.
Also, move a bit more of NES-specific initialisation and menu display to
the NES.ino module.
This saves about 1490 bytes of code.
Replace switch blocks which produce one output with const tables.
Use functions instead of repeating code.
Move common initial and final statements outside of blocks.
Also, do not erase/flash second bank on dual-bank chips when the first one
had failures.
This saves about 520 bytes of code and increases ram use by 12 bytes.
It seems crc32EEP only exists because the actual number of bytes read from
file were not checked, hence falling back to smaller reads.
Instead, always read up to the full available buffer, adding to the CRC
only as many bytes as were actually read.
Also, move some related variables to local scope.
Overall, this saves about 50 bytes of code and 80 bytes of global ram.
In this codepath, there will be a second call just after displaying the
CRC, making this call redundant.
For completeness: In the alternate codepath, the next operation does a lot
of IO, so it makes sense to refresh the screen before printing the CRC.
This avoids code duplication between it and
convertPgm(const char* const [], byte)
for just 3 callers, when the callers can be easily updated to call the
latter.
Also, this resolves a warning about `count` being potentially used
uninitialised: when landing in the "Too many files" codepath.
With this simplification, the limit on the number of files is removed. It
is unclear whether that was intentional (maybe this was gating other
issues ?)?
Values can be directly composed/initialised in menuOptionspceCart, avoiding
the need to strcpy to it.
This saves about 100 bytes of ram by dropping a few global char arrays.
Re-duplicates "Reset" string initialiser, but this should not be a big
deal.
flashid (almost) always contains the hexadecimal representation of two
bytes, which then means it gets compares with strcmp, which in turn need
another string argument. Instead, make it an integer, removing the need to
call strcmp.
Add a separate string representation for printing purposes (maybe this can be
avoided by having the print function format it when needed ?).
The only apparent case where flashid is not an hexadecimal representation
of a pair of bytes is when N64 clears it to "CONF". Set flashid to zero
this case.
This saves about 500 bytes of program space and 200 bytes of ram.
The header offsets were wrong so the size wasn't correctly computed and generally ended up defaulting to 32KB. Stunt Race FX, at least, uses 64KB and so only half the save data was being read.
