Controlling the micropython repl from Python with PySerial

[salimfadhley]

I'd like to be able to control my Micropython's REPL from my PC.

Initially this is just going to do some trivial stuff (e.g. execute some python), but once I get the basics sorted I'd like to make a tool that automates deploying and testing of code to the pyboard.

I was able to write a few bytes to the board (visible when I manually connect to the repl), but I was not able to actually execute a statement.

Can anybody see an error in my code?

Code: Select all

import logging
import serial
from contextlib import contextmanager
from fdpexpect import fdspawn

@contextmanager
def connect(port=r'/dev/ttyACM0'):
    ser = serial.Serial(port, timeout=1)
    yield fdspawn(ser)
    ser.close()
    
log = logging.getLogger(__name__)

def main():
    text = ["import pyb", "pyb.LED(1).on()"]
    with connect() as ser:
        for line in text:
            ser.expect_exact('>>>', timeout=1)
            ser.send("%s\n" % line)
        
if __name__ == '__main__':
    logging.basicConfig()
    main()

[mosi]

I am trying to imlpement serial protocol form PC to pyboard as well.

Here are my intermediate findings:

1) RAW REPL console is started with Ctrl+d (translate that into bytes) and finished with Ctrl+b (works like Enter in normal REPL)

2) on my mac in other embedded projects, usually \n does not cut it, I needed '\r\n' to print a newline

3) my REPL on pyboardV3 "freezes" randomly

4) Processing 1.5 (and 2.0) is a universal tool with the ONLY working serial comm. implementation on all three operating systems

Will try your code when I get the chance, which might take days.

[dhylands]

I am trying to imlpement serial protocol form PC to pyboard as well.

Here are my intermediate findings:

1) RAW REPL console is started with Ctrl+d (translate that into bytes) and finished with Ctrl+b (works like Enter in normal REPL)

RAW REPL is started with Control-A. There is a script in the tools directory called pyboard.py which sends a python script to the pyboad using th raw repl.

2) on my mac in other embedded projects, usually \n does not cut it, I needed '\r\n' to print a newline

That's normal for serial. \r returns the cursor to column 1 of the current line. \n advances the cursor to the same column of the next line.

3) my REPL on pyboardV3 "freezes" randomly

Are you running the latest firmware? I remember some problems like this from the early days, but I haven't seen anything like this recently.

4) Processing 1.5 (and 2.0) is a universal tool with the ONLY working serial comm. implementation on all three operating systems

Will try your code when I get the chance, which might take days.

[mosi]

RAW REPL is started with Control-A. There is a script in the tools directory called pyboard.py which sends a python script to the pyboad using th raw repl.

Correct.

Thank you for the pyboard.py example, looks like Ctrl+a, Ctrl+b Ctrl+c Ctrl+d all are implemented, perfect!

[salimfadhley]

I think this is the script: https://github.com/micropython/micropyt ... pyboard.py

[zaord]

2) on my mac in other embedded projects, usually \n does not cut it, I needed '\r\n' to print a newline

That's normal for serial. \r returns the cursor to column 1 of the current line. \n advances the cursor to the same column of the next line.


I solve this like that :

Code: Select all

import sys
from rshell import main
from rshell import pyboard

pyb = pyboard.Pyboard('COM4')

pyb.enter_raw_repl()
sys.stdout.write(pyb.exec("import pyb"))

[zaord]

Thank you for the pyboard.py example, looks like Ctrl+a, Ctrl+b Ctrl+c Ctrl+d all are implemented, perfect!

How can you send a ctrl+a in raw repl ???

Something like pyb.exec("ctrl+a") ?