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[SOLVED] REPL Doesn't Work
Posted: Wed Oct 19, 2016 11:50 am
by ioukos
Hello users,
I've just received a Wemos D1 Mini Pro, I've uploaded the official esp8266-20160909-v1.8.4.bin from
http://micropython.org/download using the updated
https://github.com/themadinventor/esptool from Linux.
Everything looks good, except the REPL that doesn't allow me to type commands/instructions in it. In an other hand I can read "print" output from a main.py, and even see the ">>>" prompt.
To sum up, I can read in REPL, but can't write.
Do you have any idea or suggestion ? thank You
I'll check with the new version 1.8.5 and nodemcu firmware.
PS : it doesn't seem to be a common problem as no results show up on google
Re: REPL Doesn't Work
Posted: Wed Oct 19, 2016 3:26 pm
by chrisgp
Hopefully someone has some experience with this problem and can give you a more actionable answer, but until then can you explain a bit more about your setup? Which program are you using to talk to the device (Putty on Windows, screen on mac or linux) and are you configuring it for 115000 baud (I'm guessing so based on getting output, but just wanted to verify).
Some things to try: 1.) Hit Ctrl-C in the terminal just to make sure some loop isn't preventing the REPL from processing data, 2.) Press the reset button on the board while hooked up to the terminal -- you should get some output that you can share.
Re: REPL Doesn't Work
Posted: Wed Oct 19, 2016 4:38 pm
by ioukos
Hi Chrisgp,
Thank you for your answer ;
So I use minicom -s on Linux with : 115200 8N1
1) Ctrl-c : doesn't work, I have the prompt ">>>" as I boot the board
2) Here is what I see when I reset the board :
Code: Select all
l��|���#4 ets_task(40100384, 3, 3fff6300, 4)
WebREPL daemon started on ws://192.168.4.1:8266
Started webrepl in setup mode
could not open file 'main.py' for reading
MicroPython v1.8.5-10-g0e69e6b on 2016-10-17; ESP module with ESP8266
Type "help()" for more information.
>>>
I've tried with the last build of Micropython and I have the same problem, and here is my command to upload the firmware, do you think it's OK guys ? I'm not sure with the dio and 32m values.
Code: Select all
esptool.py write_flash -fm dio -fs 32m 0x00000 ~/micropython/esp8266-20161017-v1.8.5.bin
Re: REPL Doesn't Work
Posted: Wed Oct 19, 2016 5:31 pm
by ioukos
Well, I did some experiments and it seems that it a problem with the CP2104 driver on Linux. It seems weird to me but REPL works perfectly fine on my Mac Book (with screen) and not on my Ubuntu 16.04... I'm trying to upgrade but I dont feel confident.
Re: REPL Doesn't Work
Posted: Wed Oct 19, 2016 6:38 pm
by deshipu
Can you try "screen /dev/ttyUSB0 115200" instead of minicom? Does that work better?
Re: REPL Doesn't Work
Posted: Thu Oct 20, 2016 1:34 am
by dhylands
Make sure you have flow control disabled.
Re: REPL Doesn't Work
Posted: Thu Oct 20, 2016 7:12 am
by ioukos
dhylands wrote:Make sure you have flow control disabled.
You were right ! I had to disable Hardware FC to make it work on the D1 mini pro. But not with the D1 mini.
deshipu wrote:Can you try "screen /dev/ttyUSB0 115200" instead of minicom? Does that work better?
You were right too ! It works, sorry.
Do you know where does this behaviour come from ? Is it because of the new UART Chip ?
Anyway, thank you,
How can I tag tag my post as RESOLVED ?
Re: REPL Doesn't Work
Posted: Thu Oct 20, 2016 11:03 am
by platforma
picocom works well for me, with the same CP2104 driver!
You can prepend [Solved] to the title of your original post to mark it solved.
Re: REPL Doesn't Work
Posted: Thu Oct 20, 2016 3:39 pm
by deshipu
ioukos wrote:
[...]
I had to disable Hardware FC to make it work on the D1 mini pro. But not with the D1 mini.
[...]
Do you know where does this behaviour come from ? Is it because of the new UART Chip ?
I think that is because the old chip didn't even have support for hardware flow control, so it was ignored on the software side, while the new chip has optional support for it, but it's not being used here.