QUERY · ISSUE

esp8266 hardware flow control issue

openby skylin008opened 2017-01-11updated 2021-04-30

enhancementport-esp8266

How to use esp8266 UART0/UART1 hardware flow control function! Thanks!

CANDIDATE · ISSUE

esp8266: NodeMCU REPL not responding due to minicom flow control

closedby MoonshineSGopened 2017-06-20updated 2020-06-20

After a very uneventful setup of the latest esp8266-20170612-v1.9.1.bin firmware on a new NodeMCU I am stuck.
Using esptool.py v 2.0 on RaspberryPi, and minicom and after connection there is no prompt from MicroPython. A soft reset using the button, shows the screen below:

dÜ^^^Oòý#4 ets_task(40100164, 3, 3fff829c, 4)
OSError: [Errno 2] ENOENT

MicroPython v1.9.1-8-g7213e78d on 2017-06-12; ESP module with ESP8266
Type "help()" for more information.
>>>

(the funny characters in front are aways different...)

any user input has no response

Update:
v1.9.1-13-g1e70fda6 same results

Assessment

S Sonnet · high

Both issues involve ESP8266 UART and flow control, but they address different problems. The query (#2780) is a feature request for hardware RTS/CTS flow control support in MicroPython's ESP8266 UART API. The candidate (#3154) is a bug report where minicom's software/hardware flow control settings cause the REPL to hang — the user's terminal tool is asserting RTS which the ESP8266 interprets as a pause signal, resulting in an unresponsive REPL. The candidate's root cause is a user configuration issue (minicom flow control enabled by default), not a missing MicroPython feature. Neither resolves the other.

Suggested action

No action needed between these two items. #3154 can be closed as a user configuration issue (disable flow control in minicom). #2780 remains open as a genuine feature request for HW flow control API support.

esp8266 hardware flow control issue

esp8266: NodeMCU REPL not responding due to minicom flow control

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