$700 controls whether they are scanned for internally in the main program (1) or always located externally (0).
If scanned for internally the program is run twice, initially in check mode to locate the subroutines before it is rewound and run in normal mode.
If stored externally the file P<macro number>.macro is run, <macro number> is the M98 P value.
Parking mode improvements.
Removed requirement for external encoder for spindle sync if stepper spindle is enabled.
Improved handling of $680 stepper enable delay.
Added ADC/DAC resolution to $pinstate command, changed reported values to integer for ADC/DAC devices and float formatted for PWM devices.
Numeric settings can now be set via G65P1Q<n>S<value>, <n> is the setting number, <value> is the new value.
Changed alarm code for Modbus exceptions (communication errors) from 14 to 19.
Refactored MPG stream code to allow plugins to hook into MPG streams (via event handler).
Added _free memory system parameter, returns value in KBytes or -1 if not available from driver.
Changed basic stream data type from char to uint8_t, added HAL function and core API for releasing/closing UART streams.
Some minor bug fixes such as incorrect error code returned for unknown $-commands and temporary incorrect position reporting on in-flight G92 offset changes.
Added $PORTS command for listing serial ports, later I will update all drivers to provide the optional information.
Potential fix for polar kinematics not handling axes > 3 correctly, needs testing. Ref. issue #820.
Added HAL support for setting serial stream format.
Added setting $681 for configuring Modbus RTU stream parity, available when the underlying driver supports format setting.
Removed IDLE state requirement for executing G65 macros, an error will no longer be returned and the macro will be run.
Added event handler for outputting welcome message on "native" USB connect for drivers that provides the linestate changed event.
Moved RGB API definitions to separate file and added some utilities for drivers and plugins. Fixed minor bug.
stream_open_instance(), signature change - added optional description string.
Allowed use of unused (by the core) axis words (ABCUVW) in M-code commands implemented by plugin code.
Added $PINSTATE command, for outputting auxillary pin states, modes and capabilities. Machine readable formatting.
Added 5s timeout/abort handling when waiting for index pulses prior to startiong spindle synchronized motion.
Added definitions for M401 (deploy probe) and M402 (stow probe) for plugin use.
Added support for probe protected message and alarm. Requires driver support for interrupt handled probe input.
Added `$ESG` and `$ESH` system commands for outputting current setting definitions.
Added setting descriptions to most settings. Work in progress.
Added/updated preprocessor code for leaner board map files++
added some crossbar pin definitions and limited $TPW retract to Z home.
Moved some common driver code to the core and update of current position on steps/mm changes.
