LionBS76
commented
1 month ago Hello.
Flashed esp-link latest stable ver to NodeMCU v3 with CH340 chip. Flashed nodeMCU works in such ways:
- Web interface works;
- WiFi works;
- Terminal communication trough builtin USB port (CH340 chip, USB-TTL) works. I can send to NodeMCU and receive from NodeMCU;
When I try to use RXD0 & TXD0 (GPIO3 & GPIO1) pins to connect to external USB-TTL board then I can only send data from NodeMCU. So only TX works. And can't receive any data on RX pin from USB (COM port) !
When I swap serial from Web interface and reconnect on the fly external USB-TTL board to RXD2 & TXD2 (GPIO13 & GPIO15) then communication through external USB port (USB-TTL) start working ! But if I reload (plug out and plug in) NodeMCU with swaped RX/TX config and connected external USB-TTL board to RXD2 & TXD2 (GPIO13 & GPIO15) pins then NodeMCU doesn't start at all !
Try to answer on ,y own question/problem :) Seems that this is NodeMCU/Wemod D1 mini (and similar dev boards) problem. This dev boards have USB-TTL converter and RX pin always stay HIGH so there is no possibility to use it for normal communication. Have to use ESP-01 and so on.
uzi18
Hello.
Flashed esp-link latest stable ver to NodeMCU v3 with CH340 chip. Flashed nodeMCU works in such ways:
When I try to use RXD0 & TXD0 (GPIO3 & GPIO1) pins to connect to external USB-TTL board then I can only send data from NodeMCU. So only TX works. And can't receive any data on RX pin from USB (COM port) !
When I swap serial from Web interface and reconnect on the fly external USB-TTL board to RXD2 & TXD2 (GPIO13 & GPIO15) then communication through external USB port (USB-TTL) start working ! But if I reload (plug out and plug in) NodeMCU with swaped RX/TX config and connected external USB-TTL board to RXD2 & TXD2 (GPIO13 & GPIO15) pins then NodeMCU doesn't start at all !