Some tips on hooking up wired-ethernet ENC28J60 to the ESP32.
I found this helpful review for the Hiletgo Enc28j60 reseau LAN Ethernet Module on Amazon:
MOSI on the board is ST (one would expect SI), the interrupt pin is LNT (again, INT is to be expected), there’s a Q3 pin whose functionality is lost on me because the pinout on HiLetgo’s schematic doesn’t specify it, there’s a second ground pin, and while the power pin specifies 5V, this board should not operate with a 5V input unless there’s some unknown level shifter within the board. The main problem I had on startup was the unstable oscillator. I realized later that the power and ground pins on the PCB were shorted. As soon as I used the other ground on the board, the issue was solved and the chip operated as is specified on the datasheet. It’s a really weird solution to a really simple problem that wouldn’t happen had there been sufficient quality control.
See also the Microchip ENC28J60 Data Sheet
This Hiletgo ENC28J60 schematic from Amazon:
There are at least two different ENC28J60 boards, each with completely different pins and labeling. One is obvous, the other no so much. Fortunately [gildas] posted some useful information on the arduino site , see also njh/EtherCard regarding the second pinout:
| Arduino | ESP32 | alt name | label | label | alt name | ESP32 | arduino |
|---|---|---|---|---|---|---|---|
| 5V | 5V | 5V | 5V | GND | GND | GND | GND |
| GPIO4 | INT | LNT | CLK | ? | ? | ? | |
| Pin 12 | GPIO25 | SPI_MISO | SO | WOL | WakeOnLan | ||
| Pin 13 | GPIO19 | SCK | SCK | ST | SI/SPI_MOSI | GPIO23 | Pin 11 |
| Reset | RST | CS | SPI_CS | GPIO22 | Pin 10 | ||
| 3V3 | 3.3v | Q3 | GND | GND | GND |
Use either 5V/GND OR Q3/GND (3.3v) - but not both!
Note active low pins: RESET, CS, INT
ESP32 JTAG Pinout Wiring
TDI -> GPIO12
TCK -> GPIO13
TMS -> GPIO14
TDO -> GPIO15
TRST -> EN / RST (Reset)
GND -> GND
ENC28J60 Pinout Wiring
From Espressif Pin Assignment example:
SPI_CLK -> GPIO19
SPI_MOSI -> GPIO23
SPI_MISO -> GPIO25
SPI_CS -> GPIO22
Interrupt -> GPIO4
JTAG
| ESP32 | Name | Pin | Pin | Name | ESP32 |
|---|---|---|---|---|---|
| 3v3 | VTref | 1 | 2 | NC | GND |
| EN/RST | nTRST | 3 | 4 | GND | GND |
| GPIO12 | TDI | 5 | 6 | GND | GND |
| GPIO14 | TMS | 7 | 8 | GND | GND |
| GPIO13 | TCK | 9 | 10 | GND | GND |
| GND | RTCK | 11 | 12 | GND | GND |
| GPIO15 | TDO | 13 | 14 | GND* | NC |
| NC | RESET | 15 | 16 | GND* | NC |
| NC | DBGRQ | 17 | 18 | GND* | NC |
| NC | 5v out | 19 | 20 | GND* | NC |
ENC28J60 Ethernet (flavor #1)
| GPIO | ENC28J60 | Color |
|---|---|---|
| GPIO19 | SPI_CLK | gray |
| GPIO23 | SPI_MOSI | orange |
| GPIO25 | SPI_MISO | yellow |
| GPIO22 | SPI_CS | white |
| GPIO4 | Interrupt | brown |
JTAG
TDI -> GPIO12
TCK -> GPIO13
TMS -> GPIO14
TDO -> GPIO15
TRST -> EN / RST (Reset)
GND -> GND
Alternate JTAG
| name | color |
|---|---|
| vt | red |
| tdo | purple |
| tck | bkue |
| tms | yellow |
| tdi | orange |
| trst | gray |
| vt | red |
