M5Stack Unit2 switch mode by sending command in serial port

Reply to M5Stack Unit2 switch mode by sending command in serial port on Fri, 09 Dec 2022 08:36:28 GMT

class14 — Fri, 09 Dec 2022 08:36:28 GMT

Getting closer... This is the string to change modes.

Function switch
Switch between different recognition functions by clicking the navigation bar of the function page or sending JSON commands through Serial Port communication. Note: Except at the end of the sent command string, no line breaks are allowed in other positions.

{
"function": "Camera Stream",
"args": ""
}

BUT this is what I get in return

{"error":"invalid json format."}
{"error":"invalid json format."}
{"error":"invalid json format."}
{"error":"invalid json format."}
{"error":"Command is not supported"}
{"error":"invalid json format."}
{"error":"invalid json format."}

Anyone have any ideas?
I'm sending the string through a serial termanal. CR,LF

Reply to M5Stack Unit2 switch mode by sending command in serial port on Thu, 31 Mar 2022 11:07:10 GMT

satit — Thu, 31 Mar 2022 11:07:10 GMT

I would like to send command to change unit v2 to code dectector by arduino when m5 Stack power on. Please give me sample code. Thank you.
.

Reply to M5Stack Unit2 switch mode by sending command in serial port on Sun, 27 Feb 2022 19:41:58 GMT

tguneysu — Sun, 27 Feb 2022 19:41:58 GMT

Hi Odemakov
Any way you can just provide the actual string sent for any one of the functions?
I am not using Python and have a hard time parsing what the code produces as a json string that is sent to V2.
Thanks.

Reply to M5Stack Unit2 switch mode by sending command in serial port on Thu, 24 Feb 2022 06:56:20 GMT

odemakov — Thu, 24 Feb 2022 06:56:20 GMT

Finally I managed to switch the mode from Raspberry PI using ReaderThread. Here is the code:

import sys
import traceback
import argparse
import json
import serial
from serial.threaded import LineReader, ReaderThread
from time import sleep

MODES = [
    'Audio FFT',
    'Code Detector',
    'Face Detector',
    'Lane Line Tracker',
    'Motion Tracker',
    'Shape Matching',
    'Camera Stream',
    'Online Classifier',
    'Color Tracker',
    'Face Recognition',
    'Target Tracker',
    'Shape Detector',
    'Object Recognition',
]

ap = argparse.ArgumentParser()
ap.add_argument('-m', '--mode', help = 'Switch to mode: {}'.format(MODES))
ap.add_argument('-a', '--args', default = '', help = 'Some modes require extra args. For "Object Recognition" either "yolo_20class" or "nanodet_80class"')
args = vars(ap.parse_args())

if 'mode' not in args or args['mode'] not in MODES:
    ap.print_help()
    exit(1)

OBJECT_RECOGNITION_ARGS = [
    'yolo_20class',
    'nanodet_80class'
]
if args['mode'] == 'Object Recognition' and args['args'] not in OBJECT_RECOGNITION_ARGS:
    ap.print_help()
    exit(1)

class PrintLines(LineReader):
    def connection_made(self, transport):
        super(PrintLines, self).connection_made(transport)
        sys.stdout.write('port opened\n')

    def handle_line(self, data):
        sys.stdout.write('line received: {}\n'.format(repr(data)))

    def connection_lost(self, exc):
        if exc:
            traceback.print_exc(exc)
        sys.stdout.write('port closed\n')

with serial.Serial() as s:
    s.port = '/dev/ttyAMA0'
    s.baudrate = 115200
    s.timeout = .5
    s.open()

    with ReaderThread(s, PrintLines) as protocol:
        js = {
            'function': args['mode'],
            'args': args['args']
        }
        protocol.write_line(json.dumps(js))
        sleep(2)

And the output:

pi@rpi0:~/serial$ ./serial_mode.py --mode 'Object Recognition' --args 'yolo_20class'
port opened
line received: '{"msg":"function switched to object_recognition."}'
line received: '{"msg":"Running Object Recognition, Copyright 2021 M5Stack Technology Co., Ltd. All rights reserved.","running":"Object Recognition"}'
port closed