PoC of remote CW keyer operation

remote_cw_keyer.py

# SPDX-License-Identifier: GPL-3.0-or-later

import select
import serial
import sys
import time

def wpm_to_millis(wpm):
  return 60000/(wpm*50)

def dit(ser, millis):
  ser.rts = True
  time.sleep(millis)
  ser.rts = False
  time.sleep(millis)
 
def dah(ser, millis):
  dit(ser, 3*millis)

def speed_control(wpm):
  # Detects keyboard actions to increase or decrease sleep time
  if select.select([sys.stdin], [], [], 0)[0]:
    char = sys.stdin.read(1)
    if char == 'W':
      wpm += 1
    elif char == 'w':
      wpm -= 1
    elif char == 'q':
      break

# Connects to physical serial port
physical_port = serial.Serial('COM1', 9600, timeout=1)

# Creates a virtual serial port
virtual_port = serial.Serial('COM2', 9600, timeout=1)

print("Manual serial CW keyer: perss [q] to exit")

while(1):
  # Sets wpm speed
  wpm = 28
  speed_control(wpm)
  millis = wpm_to_millis(wpm)
  print("Speed: ", wpm, " wpm", " [w-W]", end='\r')

  # Tests if either CTS or DSR is set on the physical serial port
  if physical_port.dsr:
      dah(virtual_port, millis)
  elif physical_port.cts:
      dit(virtual_port, millis)

# Closes the serial ports
physical_port.close()
virtual_port.close()