LinuxCNC_ArduinoConnector/arduino.py

#!/usr/bin/python3.9
import serial, time, hal
#	LinuxCNC_ArduinoConnector
#	By Alexander Richter, info@theartoftinkering.com 2022

#	This Software is used as IO Expansion for LinuxCNC. Here i am using a Mega 2560.

#	It is NOT intended for timing and security relevant IO's. Don't use it for Emergency Stops or Endstop switches!

#	You can create as many digital & analog Inputs, Outputs and PWM Outputs as your Arduino can handle.
#	You can also generate "virtual Pins" by using latching Potentiometers, which are connected to one analog Pin, but are read in Hal as individual Pins.

#	Currently the Software provides: 
#	- analog Inputs
#	- latching Potentiometers
#	- 1 binary encoded Selector Switch
#	- digital Inputs
#	- digital Outputs

#	The Send and receive Protocol is <Signal><PinNumber>:<Pin State>
#	To begin Transmitting Ready is send out and expects to receive E: to establish connection. Afterwards Data is exchanged.
#	Data is only send everythime it changes once.

#	Inputs & Toggle Inputs  = 'I' -write only  -Pin State: 0,1
#	Outputs                 = 'O' -read only   -Pin State: 0,1
#	PWM Outputs             = 'P' -read only   -Pin State: 0-255
#   Digital LED Outputs     = 'D' -read only   -Pin State: 0,1
#	Analog Inputs           = 'A' -write only  -Pin State: 0-1024
#	Latching Potentiometers = 'L' -write only  -Pin State: 0-max Position
#	binary encoded Selector = 'K' -write only  -Pin State: 0-32
#	Matrix Keypad			= 'M' -write only  -Pin State: 0,1


#	Command 'E0:0' is used for connectivity checks and is send every 5 seconds as keep alive signal

#	This program is free software; you can redistribute it and/or modify
#	it under the terms of the GNU General Public License as published by
#	the Free Software Foundation; either version 2 of the License, or
#	(at your option) any later version.
#	This program is distributed in the hope that it will be useful,
#	but WITHOUT ANY WARRANTY; without even the implied warranty of
#	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
#	See the GNU General Public License for more details.
#	You should have received a copy of the GNU General Public License
#	along with this program; if not, write to the Free Software
#	Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


c = hal.component("arduino") 	#name that we will cal pins from in hal
connection = '/dev/ttyACM0' 	#this is the port your Arduino is connected to. You can check with ""sudo dmesg | grep tty"" in Terminal


# Set how many Inputs you have programmed in Arduino and which pins are Inputs, Set Inputs = 0 to disable
Inputs = 5
InPinmap = [37,38,39,40,41]

# Set how many Toggled ("sticky") Inputs you have programmed in Arduino and which pins are Toggled Inputs , Set SInputs = 0 to disable
SInputs = 5
sInPinmap = [32,33,34,35,36]


# Set how many Outputs you have programmed in Arduino and which pins are Outputs, Set Outputs = 0 to disable
Outputs = 9				#9 Outputs, Set Outputs = 0 to disable
OutPinmap = [10,9,8,7,6,5,4,3,2,21]	

# Set how many PWM Outputs you have programmed in Arduino and which pins are PWM Outputs, you can set as many as your Arduino has PWM pins. List the connected pins below.
PwmOutputs = 0			#number of PwmOutputs, Set PwmOutputs = 0 to disable 
PwmOutPinmap = [11,12]	#PwmPutput connected to Pin 11 & 12

# Set how many Analog Inputs you have programmed in Arduino and which pins are Analog Inputs, you can set as many as your Arduino has Analog pins. List the connected pins below.
AInputs = 0				#number of AInputs, Set AInputs = 0 to disable 
AInPinmap = [1]			#Potentiometer connected to Pin 1 (A0)


# Set how many Latching Analog Inputs you have programmed in Arduino and how many latches there are, you can set as many as your Arduino has Analog pins. List the connected pins below.
LPoti = 0				#number of LPotis, Set LPoti = 0 to disable 
LPotiLatches = [[2,9],	#Poti is connected to Pin 2 (A1) and has 9 positions
				[3,4]]	#Poti is connected to Pin 3 (A2) and has 4 positions

# Set if you have an binary encoded Selector Switch and how many positions it has (only one supported, as i don't think they are very common and propably nobody uses these anyway)
# Set BinSelKnob = 0 to disable
BinSelKnob = 0 	#1 enable
BinSelKnobPos = 32

# Set how many Digital LED's you have connected. 
DLEDcount = 0 



# Support For Matrix Keypads. This requires you to install and test "xdotool". 
#You can install it by typing "sudo apt install xdotool" in your console. After installing "xdotool type "Hello World" should return Hello World in the Terminal. 
# If it doesn't, something is not working and this program will not work either. Please get xdotool working first. 
# The Key press is received as M Number of Key:HIGH/LOW. M2:1 would represent Key 2 beeing Pressed. M2:0 represents letting go of the key.
# Key Numbering is calculated in the Matrix. for a 4x4 Keypad the numbering of the Keys will be like this:
#	1,	2,	3,	4
#	5,	6,	7,	8
#	9,	10,	11,	12
#	13,	14,	15,	16
#
# Assign Values to each Key in the following Settings.
# These Inputs are handled differently from everything else, because thy are send to the Host instead and emulate actual Keyboard input.
# You can specify special Charakters however, which will be handled as Inputs in LinuxCNC. Define those in the LCNC Array below.


Keypad = 0	# Set to 1 to Activate
LinuxKeyboardInput = 1	#Activate direct Keyboard integration to Linux.
Columns = 4
Rows = 4
Chars = [			#here you must define as many characters as your Keypad has keys. calculate columns * rows . for example 4 *4 = 16. You can write it down like in the example for ease of readability.
 "1", "2", "3", "A",
 "4", "5", "6", "B",
 "7", "8", "9", "C",
 "#", "0", "*", "D"
] 

# These are Settings to connect Keystrokes to Linux, you can ignore them if you only use them as LinuxCNC Inputs.

Destination = [		#define, which Key should be inserted in LinuxCNC as Input or as Keystroke in Linux. 
					#you can ignore it if you want to use all Keys as LinuxCNC Inputs.
					# 0 = LinuxCNC 
					# 1 = Linux
	0, 0, 0, 1,
	0, 0, 0, 1,
	0, 0, 0, 1, 
	1, 0, 1, 1
]



Debug = 0
Debug = 0		#only works when this script is run from halrun in Terminal. "halrun","loadusr arduino" now Debug info will be displayed.
########  End of Config!  ########
olddOutStates= [0]*Outputs
oldPwmOutStates=[0]*PwmOutputs
oldDLEDStates=[0]*DLEDcount


if LinuxKeyboardInput:
	import subprocess

# Inputs and Toggled Inputs are handled the same. 
# For DAU compatiblity we set them up seperately. 
# Here we merge the arrays.

Inputs = Inputs+ SInputs
InPinmap += sInPinmap
######## SetUp of HalPins ########

# setup Input halpins
for port in range(Inputs):
    c.newpin("dIn.{}".format(InPinmap[port]), hal.HAL_BIT, hal.HAL_OUT)
    c.newparam("dIn.{}-invert".format(InPinmap[port]), hal.HAL_BIT, hal.HAL_RW)

# setup Output halpins
for port in range(Outputs):
    c.newpin("dOut.{}".format(OutPinmap[port]), hal.HAL_BIT, hal.HAL_IN)
    olddOutStates[port] = 0

# setup Pwm Output halpins
for port in range(PwmOutputs):
    c.newpin("PwmOut.{}".format(PwmOutPinmap[port]), hal.HAL_FLOAT, hal.HAL_IN)
    oldPwmOutStates[port] = 255
# setup Analog Input halpins
for port in range(AInputs):
    c.newpin("aIn.{}".format(AInPinmap[port]), hal.HAL_FLOAT, hal.HAL_OUT)

# setup Latching Poti halpins
for Poti in range(LPoti):
	for Pin in range(LPotiLatches[Poti][1]):
		c.newpin("LPoti.{}.{}" .format(LPotiLatches[Poti][0],Pin), hal.HAL_BIT, hal.HAL_OUT)

# setup Absolute Encoder Knob halpins
if BinSelKnob:
	for port in range(BinSelKnobPos):
		c.newpin("BinSelKnob.{}".format(port), hal.HAL_BIT, hal.HAL_OUT)

# setup Digital LED halpins
if DLEDcount > 0:
	for port in range(DLEDcount):
		c.newpin("DLED.{}".format(port), hal.HAL_BIT, hal.HAL_IN)
		oldDLEDStates[port] = 0
# setup MatrixKeyboard halpins
if Keypad > 0:
	for port in range(Columns*Rows):
		if Destination[port] == 0 & LinuxKeyboardInput:
			pass #if destination is set to Linux, don't register a Hal Pin for this key.
		else:
			c.newpin("Keypad.{}".format(Chars[port]), hal.HAL_BIT, hal.HAL_IN)
c.ready()

#setup Serial connection
arduino = serial.Serial(connection, 115200, timeout=1, xonxoff=False, rtscts=False, dsrdtr=True)
######## GlobalVariables ########
firstcom = 0
event = time.time()
timeout = 9 #send something after max 9 seconds


######## Functions ########

def keepAlive(event):
    return event + timeout < time.time()

def readinput(input_str):
	for i in range(50):

		if input_str:
			string = input_str.decode()  # convert the byte string to a unicode string
			print (string)
			num = int(string) # convert the unicode string to an int
	return num


def extract_nbr(input_str):
    if input_str is None or input_str == '':
        return 0

    out_number = ''
    for ele in input_str:
        if ele.isdigit():
            out_number += ele
    return int(out_number) 

def managageOutputs():
	for port in range(PwmOutputs):
		State = int(c["PwmOut.{}".format(PwmOutPinmap[port])])
		if oldPwmOutStates[port] != State: 	#check if states have changed
			Sig = 'P'
			Pin = int(PwmOutPinmap[port])
			command = "{}{}:{}\n".format(Sig,Pin,State)
			arduino.write(command.encode())
			if (Debug):print ("Sending:{}".format(command.encode()))
			oldPwmOutStates[port]= State

	for port in range(Outputs):
		State = int(c["dOut.{}".format(OutPinmap[port])])
		if olddOutStates[port] != State:	#check if states have changed
			Sig = 'O'
			Pin = int(OutPinmap[port])
			command = "{}{}:{}\n".format(Sig,Pin,State)
			arduino.write(command.encode())
			if (Debug):print ("Sending:{}".format(command.encode()))
			olddOutStates[port]= State
		
	for port in range(DLEDcount):
		State = int(c["DLED.{}".format(port)])
		if oldDLEDStates[port] != State: #check if states have changed
			Sig = 'D'
			Pin = int(port)
			command = "{}{}:{}\n".format(Sig,Pin,State)
			arduino.write(command.encode())
			oldDLEDStates[port] = State
			if (Debug):print ("Sending:{}".format(command.encode()))


while True:
	
	try:
		data = arduino.readline().decode('utf-8')					#read Data received from Arduino and decode it
		if (Debug):print ("I received:{}".format(data))
		data = data.split(":",1)

		try:
			cmd = data[0][0]
			if cmd == "":
				if (Debug):print ("No Command!:{}.".format(cmd))
			
			else:
				if not data[0][1]:
					io = 0
				else:
					io = extract_nbr(data[0])
				value = extract_nbr(data[1])
				if value<0: value = 0
				

				if cmd == "I":
					firstcom = 1
					if value == 1:
						c["dIn.{}".format(io)] = 1
						c["dIn.{}-invert".format(io)] = 0
						if(Debug):print("dIn{}:{}".format(io,1))
						
					if value == 0:
						c["dIn.{}".format(io)] = 0
						c["dIn.{}-invert".format(io)] = 1
						if(Debug):print("dIn{}:{}".format(io,0))
					else:pass

				elif cmd == "A":
					firstcom = 1
					c["aIn.{}".format(io)] = value
					if (Debug):print("aIn.{}:{}".format(io,value))

				elif cmd == "L":
					firstcom = 1

					for Poti in range(LPoti):
						if LPotiLatches[Poti][0] == io:
							for Pin in range(LPotiLatches[Poti][1]):
								if Pin == value:
									c["LPoti.{}.{}" .format(io,Pin)] = 1
									if(Debug):print("LPoti.{}.{} =1".format(io,Pin))
								else:
									c["LPoti.{}.{}" .format(io,Pin)] = 0
									if(Debug):print("LPoti.{}.{} =0".format(io,Pin))	

				elif cmd == "K":
					firstcom = 1
					for port in range(BinSelKnobPos):
						if port == value:
							c["BinSelKnob.{}".format(port)] = 1
							if(Debug):print("BinSelKnob.{}:{}".format(port,1))
						else:
							c["BinSelKnob.{}".format(port)] = 0
							if(Debug):print("BinSelKnob.{}:{}".format(port,0))
				
				elif cmd == "M":
					firstcom = 1
					if value == 1:
						if Destination[io] == 0 and LinuxKeyboardInput == 1:
							subprocess.call(["xdotool", "key", Chars[io]])
							if(Debug):print("Emulating Keypress{}".format(Chars[io]))
						else:
							c["Keypad.{}".format(Chars[io])] = 1
							if(Debug):print("Keypad{}:{}".format(Chars[io],1))

					if value == 0 & Destination[io] == 0:
						c["Keypad.{}".format(Chars[io])] = 0
						if(Debug):print("Keypad{}:{}".format(Chars[io],0))



				elif cmd == 'E':
					arduino.write(b"E0:0\n")
					if (Debug):print("Sending E0:0 to establish contact")
				else: pass
	

		except: pass
	

	except KeyboardInterrupt:
		if (Debug):print ("Keyboard Interrupted.. BYE")
		exit()
	except: 
		if (Debug):print ("I received garbage")
		arduino.flush()
	
	if firstcom == 1: managageOutputs()		#if ==1: E0:0 has been exchanged, which means Arduino knows that LinuxCNC is running and starts sending and receiving Data

	if keepAlive(event):	#keep com alive. This is send to help Arduino detect connection loss.
		arduino.write(b"E:\n")
		if (Debug):print("keepAlive")
		event = time.time()