TFT Marlin Simulator

screen-test.py

#!/bin/python3

import serial
import time

class Screen(object):
    def __init__(self, port, speed):
        self.serial = serial.Serial(port, speed, timeout=0.05)
        print("Opened on port: {}".format(self.serial.name))
        self.x = 10.0
        self.y = 100.0
        self.z = 1.0
        self.send(b'ok')

    def send(self, message):
        if message != b'ok' and not message.startswith(b'T:24.62') and not message.startswith(b'X:'):
            print(" "*60 + message.decode("utf-8"))
        self.serial.write(message + b'\r\n')

    def parseLine(self, message):
        #if b'M105' not in message and b'M114' not in message:
        print(message.decode("utf-8").strip())
        if b'M105' in message:
            screen.send(b'T:24.62 /0.00 B:24.75 /0.00 @:0 B@:0')
        elif b'M115' in message:
            screen.send(b'FIRMWARE_NAME:Marlin 2.0.5.3 (GitHub, jeffeb3) SOURCE_CODE_URL:https://github.com/MarlinFirmware/Marlin PROTOCOL_VERSION:1.0 MACHINE_TYPE:3D Printer EXTRUDER_COUNT:1 UUID:cede2a2f-41a2-4748-9b12-c55c62f367ff')
            screen.send(b'Cap:SERIAL_XON_XOFF:0')
            screen.send(b'Cap:BINARY_FILE_TRANSFER:0')
            screen.send(b'Cap:EEPROM:1')
            screen.send(b'Cap:VOLUMETRIC:1')
            screen.send(b'Cap:AUTOREPORT_TEMP:1')
            screen.send(b'Cap:PROGRESS:0')
            screen.send(b'Cap:PRINT_JOB:1')
            screen.send(b'Cap:AUTOLEVEL:1')
            screen.send(b'Cap:Z_PROBE:1')
            screen.send(b'Cap:LEVELING_DATA:1')
            screen.send(b'Cap:BUILD_PERCENT:0')
            screen.send(b'Cap:SOFTWARE_POWER:0')
            screen.send(b'Cap:TOGGLE_LIGHTS:0')
            screen.send(b'Cap:CASE_LIGHT_BRIGHTNESS:0')
            screen.send(b'Cap:EMERGENCY_PARSER:0')
            screen.send(b'Cap:PROMPT_SUPPORT:0')
            screen.send(b'Cap:AUTOREPORT_SD_STATUS:0')
            screen.send(b'Cap:THERMAL_PROTECTION:1')
            screen.send(b'Cap:MOTION_MODES:0')
            screen.send(b'Cap:CHAMBER_TEMPERATURE:0')
        elif b'M119' in message:
            screen.send(b'Reporting endstop status')
            screen.send(b'x_min: open')
            screen.send(b'x2_min: open')
            screen.send(b'y_min: open')
            screen.send(b'y2_min: open')
            screen.send(b'z_min: open')
        elif b'M503 S0' in message:
            screen.send(b'G21    ; Units in mm (mm)')
            screen.send(b'')
            screen.send(b'M200 D1.75')
            screen.send(b'M200 D0')
            screen.send(b'M92 X80.00 Y80.00 Z400.00 E400.00')
            screen.send(b'M203 X200.00 Y200.00 Z10.00 E50.00')
            screen.send(b'M201 X3000.00 Y3000.00 Z100.00 E20000.00')
            screen.send(b'M204 P4500.00 R3000.00 T9000.00')
            screen.send(b'M205 B20000.00 S0.00 T0.00 X10.00 Y10.00 Z0.40 E5.00')
            screen.send(b'M206 X0.00 Y0.00 Z0.00')
            screen.send(b'M420 S1 Z0.00')
            screen.send(b'M301 P26.15 I2.12 D80.66')
            screen.send(b'M304 P38.35 I2.40 D408.81')
            screen.send(b'M851 X30.00 Y0.00 Z-0.52')
            screen.send(b'M906 X900 Y900 Z900')
            screen.send(b'M906 T0 E900')
            screen.send(b'')
            screen.send(b'M913 X100 Y100 Z20')
            screen.send(b'M913 T0 E30')
            screen.send(b'')
            screen.send(b'M914 X50 Y50')
            screen.send(b'M569 S1 X Y')
            screen.send(b'M900 K0.50')
        elif b'M92' in message:
            screen.send(b'echo: M92 X80.00 Y80.00 Z400.00 E400.00')
        elif b'M420 S1' in message:
            #screen.send(b"echo:Jeffeb3's mad world of TFT sim")
            screen.send(b"Jeffeb3's mad world of TFT sim")
        elif b'M114' in message:
            screen.send('X:{} Y:{} Z:{}'.format(self.x, self.y, self.z).encode('utf-8'))
        elif message.startswith(b'G1 '):
            fields = message.split()
            for field in fields:
                if field.startswith(b'X'):
                    distance = float(field[1:])
                    self.x += distance
                if field.startswith(b'Y'):
                    distance = float(field[1:])
                    self.y += distance
                if field.startswith(b'Z'):
                    distance = float(field[1:])
                    self.z += distance
        elif message.startswith(b'G4 '):
            fields = message.split()
            for field in fields:
                if field.startswith(b'S'):
                    seconds = float(field[1:])
                    print('waiting {} seconds'.format(seconds))
                    time.sleep(seconds)
                    break

        screen.send(b'ok')

screen = Screen("/dev/ttyUSB0", 250000)

while True:
    recv = screen.serial.readline()
    if (recv):
        screen.parseLine(recv)

Sorry, there are zero comments. This was a quick script to talk to the BTT TFT screen and pretend to be Marlin. It has very limited functionality, but it does enough to be dangerous.

Not sure where else to add this info.

I also added, pip install “pyserial”

Windows users change, "/dev/ttyUSB0" to whatever the active COM port is eg "COM2"

Works great!!!!