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grblHAL changelog

Build 20200923:

  • Added support for STM32F411 based Blackpill boards.

  • Initial changes to ESP32 driver to allow compilation with PlatformIO, added my_machine.h for this. Note that my_machine.h is not used if compiling with idf.py.

  • Added home position to $# ngc report, e.g. [HOME,0.000,0.000,0.000:7] - means all axes are homed. Position is reported in machine coordinates. :7 in the example is an axis bitmap, the reported value is for which axes are homed: bit 0 is Z, 1 is X etc. :0 = no axes homed.

  • "Hardened" the new tool change functionality even more. Initial changes for multi-axis tool reference offset made.
    An empy message will now be sent when tool change is complete, this to clear any tool change related message in the sender.

  • Added call to weak my_plugin_init() function at startup, name your plugin init function my_plugin_init and there is no need to change any grblHAL source files to bring it alive.
    Use this feature for your private plugin only, multiple public plugins using this name cannot coexist!

  • Some changes to improve code readability and added strict check for G59.x gcodes.

Build 20200911:

  • Core refactored for better support for non-volatile storage. Some HAL entry points renamed for readability and moved to a new data structure.

  • Added plugin for axis odometers. This logs total distance traveled and machining time to EEPROM/FRAM.
    FRAM is recommended for storage as it is faster and can sustain a larger number of write cycles. FRAM chips are sold in packages that is pin compatible with EEPROM.
    NOTE: Currently for review and for now only for the iMRXT1061 (Teensy 4.x) driver. It will not be available in configurations that stores non-volatile data to flash.

  • "Hardening" of new manual tool change functionality.

  • Improved auto squaring algorithm in core.

  • Enhanced some plugins so they can coexist.

Build 20200830:

  • Improved tool change functionality, a status report is forced on end of tool change to inform change is completed.

  • Fix for iMRXT1062 homing failure when serial over USB is used.

  • Standardized serial over USB #define macro across drivers to USB_SERIAL_CDC.

Build 20200818:

  • Part two of large overhaul of configuration system.

Driver configuration has been moved from driver.h to my_machine.h and options has been made available to be defined as compiler defined symbols/macros with the -D compiler command line option. In order to allow compiler defined symbols to override my_machine.h settings the symbol OVERRIDE_MY_MACHINE should always be added to the command line. See compiling grblHAL for more information. Available driver options in my_machine.h can now be listed from the driver ReadMe page.

Build 20200813:

  • "Hardened" step pulse generation when delay is enabled. The delay will now only be added on direction changes. The minimum possible delay is dependent on many factors and will be adjusted to match what the processor is capable of. By default driver code is calibrated for a 2.5 µs delay and may deviate a bit for other settings and configurations. The actual delay should be checked with an oscilloscope when high step rates are used. NOTE: A delay is only added if AMASS is disabled, when AMASS is enabled (it is by default) there is always a implicit delay on direction changes.

Build 20200811:

  • Part one of large overhaul of configuration system. This has been done to allow a global configuration file and/or setting compile time options as compiler symbols/macros with the -D compiler command line option.
  • Networking (cabled ethernet), SD Card and I2C keypad plugin support added to Teensy 4.x driver. A Teensy 4.1 is required for networking.
  • Tool number range changed from 8-bit (0-255) to 32-bit (0-4294967294). Note that if the optional tool table is enabled the max tool number is limited by number of entries in the tool table.
  • M60 and corresponding pallet shuttle HAL entry point added. No driver support for this yet.

Configuration system changes:

Symbols (#define macros) that are unlikely to be changed or is used for conditional compilation has been moved from grbl/config.h to grbl/grbl.h. Symbols used for conditional compilation can be overridden by -D compiler command line options or by editing grbl/config.h.

grbl/defaults.h is now used for default values for settings that can be changed at run-time with the $$ command. Important: grbl/defaults.h should only be changed when adding new settings.

grbl/config.h is now used for overriding default values in grbl/grbl.h or grbl/defaults.h. Out of the box all overridable symbols are commented out, uncomment and change as needed to override default definitions in grbl/grbl.h or grbl/defaults.h.

These changes are part of a long term plan to create a user friendly front end for configuring and building grblHAL.

Build 20200805:

  • Important: settings has been changed again and settings will be restored to defaults after updating. Backup & restore!
  • Added tool change handler for manual tool change on M6. Four different modes available, selectable with $341 setting.
  • STMF4xx driver updated for optional I2C EEPROM plugin support.

Build 20200722:

  • Important: settings version has been changed again and settings will be restored to defaults after updating. Backup & restore!
  • Changed step pulse width and delay settings from int to float and reduced minimum allowed value to 2 microseconds1. Useful for very high step rates.
  • New plugin for quadrature encoder input for up to 5 encoders (driver dependent). Can be used to adjust overrides and has rudimentary support for MPG functionality. Work in progress and the iMXRT1062 (Teensy 4) driver is currently the only driver with low-level support for this (one encoder).
  • New plugin for ModBus VFD spindle controllers. Untested and with limited driver support in this build.
  • Added setting, $340 for spindle at speed tolerance (percent). If spindle fails to reach speed within limits in 4 seconds alarm 14 will be raised. Set to 0 to disable. Availability driver dependent.
  • All new settings are now possibly to set independent of the compatibility level except some settings that has flags added to them. The added flags will not be available at all compatibilty levels. A new command, $+, can be used to list all settings independent of compatibilty level.
  • Internal changes to settings data in order to simplify automatic migration on changes. Automatic migration is on the roadmap.

1 Note that several factors may affect the accuracy of these settings such as step output mode, number of axes defined and compiler optimization settings. A new #define, STEP_PULSE_LATENCY, has been added to driver.h for those drivers that requires it so that fine tuning can be done. I may move this to a setting later. In setups where very high step rates are used the actual step pulse width should be confirmed with an oscilloscope.

The step pulse delay has not been fine tuned yet as setting this to a value > 0 is not normally needed as there seems to be a implicit delay on direction changes when AMASS is enabled.

Note: high step rates (e.g. above 80 kHz) cannot be achieved with the step pulse setting set to the default 10 microseconds. This has to be reduced so that both the on and off time is within specifications of the stepper driver. At 100 kHz the time available for a pulse (on + off) is 10 microseconds.

Note: The SAMD21 (MKRZERO) driver needs updating in for it to allow short step pulses. My mistake was to use some Arduino code so that the Arduino pin numbers could be used for pin mappings. This adds around 500 ns per axis of overhead... To be fixed later.

For the curious: I have managed to achieve a 400 kHz step rate with the iMXRT1062 before everything breaks down, this with a command entered from MDI. I have not tested this with a running program, but I am pretty sure that a step rate at or above 200 kHz is sustainable.

2020/06/18: Added driver for STM32F4xx Black Pill, code modified by @shaise from the STM32F1xx driver. This is the first driver provided by someone else than me, thanks for that.

This driver is a candidate along with the IMXRT1062 (Teensy 4.x) driver to get spindle sync support. I have a NucleoF411RE development board on order and will look into adding a pin mapping for that when it arrives.

Build 20200603:

  • Important: settings version has been changed and settings will be restored to defaults after updating. Backup & restore!
  • Optimizations for ring buffer handling in planner and step generator.
  • New optional input signal for probe connected status, driver support will be added later to selected drivers.
  • Automatic reporting of tool length offset ([TLO:...]) when changed.
  • Support for G5 (cubic spline) added.
  • G43.x, G49 and G92 added to parser state report.
  • G76 threading cycle refactored.
  • (Re)added REPORT_PROBE_COORDINATES and TOOL_LENGTH_OFFSET_AXIS configuration options, the latter available when COMPATIBILITY_LEVEL > 2.
  • Improved backwards compatibility with vanilla grbl, e.g. G92 and tool offset(s) will be lost on a soft reset. Dependent on COMPATIBILITY_LEVEL setting.
  • Board name added to $I report if provided by driver.
  • Grbl-Sim ported to grblHAL as a driver. Added telnet support++. Can be used to test senders. Note: currently only compiled/tested for Linux.
  • Some minor bug fixes.

Build 20200503: Added configuration flag for manual homing. (Re)added compile time option ENABLE_SAFETY_DOOR_INPUT_PIN for safety door switch, default is now disabled. Some bug fixes and "hardening" of code.

Added some template code to aid customizations such as driver support for M62 - M68 M-codes mentioned below.

Build 20191222: Added digital and analog output support to the core (and HAL) as per linuxcnc specifications for M62 - M68, number of outputs available (if any) is driver dependent. Adding support for these M-commands makes it fairly easy to add driver code (for up to 256 outputs) as parsing and synchronization is taken care of by the core.

Build 20191215: Moved spindle RPM linearization to $-settings, option needs to be enabled in config.h - driver support required. Optimized EEPROM allocation handling. WebUI support for ESP32 driver improved.

MSP432 driver enhanced for spindle linearization app in the pipeline (for Windows only - needs input from spindle encoder), more work done on closed loop spindle RPM control and spindle synchronized motion - still at experimental stage.

NOTE: settings version number has been increased so settings will be reset to default after update, make a backup first!

Added #define COMPATIBILITY_LEVEL to config.h for backwards compatibility with Grbl v1.1 protocol definition, this for enabling the use of more GCode senders. Please raise an issue if your sender still does not behave well after setting this as the current implementation does not yet disable all extensions, notably new $xx settings.

G76 threading support added to grblHAL in combination with the MSP432 driver. Extensive testing is required before it can be regarded as safe.

WARNING! This is a potentially dangerous addition. Do NOT use if you do not understand the risks. A proper E-Stop is a must, it should cut power to the steppers and if possible engage any spindle brake. The implementation is based on the linuxcnc specification. Please note that I am not a machinist so my interpretation and implementation may be wrong!

G76 availablity requires a spindle encoder with index pulse, grblHAL configured to lathe mode and tuning of the spindle sync PID loop.
NOTE: Feed hold is delayed until spindle synced cut is complete, spindle RPM overrides and CSS mode disabled through the whole cycle.