#
# hello.servo.RP2350.serial.tk.py
#    RP2350 servo serial hello-world GUI
#
# Neil Gershenfeld 8/9/26
#
# This work may be reproduced, modified, distributed,
# performed, and displayed for any purpose, but must
# acknowledge this project. Copyright is retained and
# must be preserved. The work is provided as is; no
# warranty is provided, and users accept all liability.
#
import tkinter as tk
import serial,sys,time
#
# get and open port
#
if len(sys.argv) != 2:
    print("command: ")
    sys.exit(1)
port_name = sys.argv[1]
ser = serial.Serial(port_name, 115200, write_timeout=0)
#
# global variables
#
last_send = 0
pending = None
#
# send change, with rate check to not overflow
#
def on_change(val):
    global last_send,pending
    msg = f"{slider1.get()} {slider2.get()}\n"
    if pending:
        root.after_cancel(pending)
    if time.time()-last_send > 0.05:
        ser.write(msg.encode())
        last_send = time.time()
    else:
        pending = root.after(50,lambda:ser.write(msg.encode()))
#
# set up GUI
#
root = tk.Tk()
root.title("'q' to quit")
root.geometry("500x200")
root.bind('<q>',lambda event:root.destroy())
#
slider1 = tk.Scale(root,label='servo 1',to=180,orient="horizontal",length=400,command=on_change)
slider1.pack()
#
slider2 = tk.Scale(root,label='servo 2',to=180,orient="horizontal",length=400,command=on_change)
slider2.pack()
#
root.mainloop()