The cdcarduino library provides support for Arduino USB CDC ACM boards such as the Uno and Mega 2560. The library detects Arduino boards based on their USB Vendor ID and Product ID. Methods to reset (DTR and RTS) boards are provided to force the boards to run their bootloaders for Flash burning. This will not work with clone boards using CH340, CP210x, or other USB serial chips. The boards must have the Arduino USB Vendor IDs and Product IDs. This may also not work if boards are running non-standard bootloaders. Testing has been done only on genuine Arduino Uno and Mega 2560 boards running factory installed bootloaders.
TCP transparent bridge to Arduino board via USB port. This program provides firmware update functionality similar to esp-link but through the Arduino board USB port without connecting wires to UART pins. A USB Host mini board and the USB Host Shield 2.0 library are required to connect the Arduino board to the ESP. This program provides the minimum features to use avrdude with its -Pnet: network option to upload HEX files to an attached Uno or Mega 2560 over WiFi.
Uno -USB- USB Host mini -SPI- ESP8266 -WiFi- avrdude -Pnet:<IP addr>:2323
The program listens for TCP connections on port 23 and 2323. Connections on port 2323 reset the attached board so it is ready for Flash burning. Use avrdude with this port.
Connections on port 23 do not reset the board can be used to access the serial console without disturbing the board. Use telnet or a similar program.
The program uses WiFiManager so the SSID and password can be configured without changing the source code.
avresplink is a BASH shell script that runs avrdude with the correct parameters depending on the board. This can be used with this program as well as with esp-link.
$ avresplink 192.168.x.y Blink.ino.standard.hex
This will run avrdude with the following parameters. The parameters that are the same for all boards are not shown.
-patmega328p
-carduino
-Pnet:192.168.x.y:2323
-Uflash:w:Blink.ino.standard.hex:i
$ avresplink 192.168.x.y Blink.ino.mega.hex
This will run avrdude with the following parameters. The parameters that are the same for all boards are not shown.
-patmega2560
-cwiring
-Pnet:192.168.x.y:2323
-Uflash:w:Blink.ino.mega.hex:i
See the USB Host Shield Hardware Manual to see how to change VBUS from 3.3V to 5V. A trace must be cut.
| Power | NodeMCU | USB host mini |
|---|---|---|
| 5V | VIN | VBUS (cut trace) |
| GND | GND | GND |
| 3V3 | VCC | |
| D1,#5 | INT | |
| D5,#14,HSCLK | CLK | |
| D6,#12,HMISO | MISO | |
| D7,#13,HMOSI | MOSI | |
| D8,#15,HCS | SS | |
| MAX_RST (pullup resistor to 3V3) |