Keypad plugin

This plugin can be used for jogging, controlling feedhold, cycle start etc. via single character commands. The command characters can be delivered either via an I2C or an UART port.

The plugin is enabled in my_machine.h by removing the comment from the #define KEYPAD_ENABLE line and changing it if required:
#define KEYPAD_ENABLE 1 enables I2C mode, an additional strobe pin is required to signal keypresses.
#define KEYPAD_ENABLE 2 enables UART mode.

See the core wiki for more details.

Settings are provided for jog speed and distance for step, slow and fast jogging.

Character to action map:

Character	Action
!	Enter feed hold
0x82	Enter feed hold
~	Cycle start
0x81	Cycle start
?	Status report request
0x80	Status report request
0x18	Soft reset
X	Unlock
0x8B	Enable MPG full control1
0x85	Cancel jog motion2
0	Enable step mode jogging
1	Enable slow jogging mode
2	Enable fast jogging mode
h	Select next jog mode
m	Select next jog speed or step distance factor
H	Home machine
R	Continuous jog X+
L	Continuous jog X-
F	Continuous jog Y+
B	Continuous jog Y-
U	Continuous jog Z+
D	Continuous jog Z-
r	Continuous jog X+Y+
q	Continuous jog X+Y-
s	Continuous jog X-Y+
t	Continuous jog X-Y-
w	Continuous jog X+Z+
v	Continuous jog X+Z-
u	Continuous jog X-Z+
x	Continuous jog X-Z-
0x84	Toggle safety door open status
0x88	Toggle optional stop mode
0x89	Toggle single block execution mode
0x8A	Toggle Fan 0 output3
I	Restore feed override value to 100%
0x90	Restore feed override value to 100%
i	Increase feed override value 10%
0x91	Increase feed override value 10%
j	Decrease feed override value 10%
0x92	Decrease feed override value 10%
0x93	Increase feed override value 1%
0x94	Decrease feed override value 1%
0x95	Restore rapids override value to 100%
0x96	Set rapids override to 50%
0x97	Set rapids override to 25%
K	Restore spindle RPM override value to 100%
0x99	Restore spindle RPM override value to 100%
k	Increase spindle RPM override value 10%
0x9A	Increase spindle RPM override value 10%
z	Decrease spindle RPM override value 10%
0x9B	Decrease spindle RPM override value 10%
0x9C	Increase spindle RPM override value 1%
0x9D	Decrease spindle RPM override value 1%
0x9E	Toggle spindle stop override4
C	Toggle flood coolant output
0xA0	Toggle flood coolant output
M	Toggle mist coolant output
0xA1	Toggle mist coolant output
0x88	Toggle optional stop
0x89	Toggle single block
0xA4	Toggle probe connected

¹ Only available if MPG mode is enabled. Build 20220105 or later is required.
² Only available in UART mode, it is recommended to send this on all key up events. In I2C mode the strobe line going high is used to signal jog cancel.
³ The fans plugin is required.
⁴ Only available when the machine is in Hold state.

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Dependencies:

An app providing input such as this implementation.

Driver (and app) must support I2C communication and a keypad strobe interrupt signal or have a free UART port depending on the mode selected.

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2024-07-30