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Including opcodes, registers, saving to EEPROM, convert address to value, etc...
Add define (via quote), stack, call, return. Remove Servo/Stepper to simplify debugging
- Check for and initialized EEPROM if first run or invalid data.
- Limit program space in EEPROM for chips with large memory.
- printreg displays the value of the register as well as EEPROM at its address.
- moved existing "?" display code into display_status
- only '.' does a return. cr just ends lines /
- move commands into switch: ')', '@', '!'
- no longer copy p into n if n is 0 and no longer zero out n after every command. Not sure why we did that, other than to keep a pin number from one line to the next. But we can do that in the pin control command?
- Give up on I2C commands to free up ')' and '.' which also simplifies '-' and frees up '(' and '_'. Eventually '(' is for parameters. Maybe use '_' to clear when cr isn't available? Hopefully I2C can be implemented in the actual langauge. Or as a mode change / sub engine.
Digital ONLY pins are now differentiated from analog pins. e.g. on Arduino Uno, 2 to 13 are digital only, 14 to 19 are analog (or digital) but we read them via analog. This allows I and P to be used to read values inside a program, since ? is a conditional branch. e.g. 2I will read pin 2 and set n to 0 or 1. 14I will read pin 14 aka A0 and set n to the analog value read on the pin.
e.g. a"ab""cd.". makes a point to: ab"cd.
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Including opcodes, registers, saving to EEPROM via quoting, convert address to value, etc...
The layout of the memory is probably not great. All those additions and subtractions of offsets... Needs a bit of a re-think to avoid the code getting "tricky"