optimize digitalWrite about ch55xduino

[DeqingSun]

I checked the map file, the lookup tables take 160 bytes, no matter if we use digitalWrite or not. When wiring_digital is linked, an additional of 395 bytes will be used.

I think it makes sense to use macros to replace lookup tables, no code space will be used when wiring_digital is not linked. Instead, there can be a wiring_digital_fast file that uses a lot of macros to reduce code space.

[DeqingSun]

I tried to use Marco to do so. However, the code gets significantly bigger.

#define digitalPinToPort(P) ( ((P%10)<8) ? (P0PORT+(P/10)) : NOT_A_PORT )
#define digitalPinToBitMask(P) ( ((P%10)<8) ? (1<<(P%10)) : 0 )

Seems we need to find a way to make SDCC not link the array if not needed.

[DeqingSun]

fixed

f8a01ef

If you don't use any wire analog or digital functions. The LUT won't be linked.