pico-rmii-ethernet
Enable Ethernet connectivity on your Raspberry Pi Pico with an RMII based Ethernet PHY module.
Leverages the Raspberry Pi RP2040 MCU's PIO, DMA, and dual core capabilities to create a Ethernet MAC stack in software!
Hardware
- Raspberry Pico
- Any RMII based Ethernet PHY module, such as the Waveshare LAN8720 ETH Board
Wiring
| RMII Module | Raspberry Pi Pico | Library Default |
|---|---|---|
| TX1 | TX0 + 1 | 11 |
| TX-EN | TX0 + 2 | 12 |
| TX0 | any GPIO | 10 |
| RX0 | any GPIO | 6 |
| RX1 | RX0 + 1 | 7 |
| nINT / RETCLK | 20 or 22 | 20 |
| CRS | RX0 + 2 | 8 |
| MDIO | any GPIO | 14 |
| MDC | MDIO + 1 | 15 |
| VCC | 3V3 | |
| GND | GND |
Examples
See examples folder. LWIP is included as the TCP/IP stack.
Current Limitations
- RP2040 is underclocked to 50 MHz using the RMII modules reference clock
- Link speed is set to 10 Mbps (there is a issue with TX at 100 Mbps)
- Built-in LWIP stack is compiled with
NO_SYSso LWIP Netcon and Socket API's are not enabled