feat: add Raspberry Pi Pico 2 + W5500 + E22-900M30S variant (#10135)
* feat: add Raspberry Pi Pico 2 + W5500 + E22-900M30S variant Adds community variant for Raspberry Pi Pico 2 (RP2350, 4 MB flash) with external WIZnet W5500 Ethernet module and EBYTE E22-900M30S LoRa module (SX1262, 30 dBm PA, 868/915 MHz). Key details: - LoRa on SPI1: GP10/11/12/13 (SCK/MOSI/MISO/CS), RST=GP15, DIO1=GP14, BUSY=GP2, RXEN=GP3 (held HIGH via SX126X_ANT_SW) - W5500 on SPI0: GP16/17/18/19/20 (MISO/CS/SCK/MOSI/RST) - SX126X_DIO2_AS_RF_SWITCH: DIO2→TXEN bridge on module handles PA - SX126X_DIO3_TCXO_VOLTAGE 1.8: TCXO support via EBYTE_E22 flags - DHCP timeout reduced to 10 s to avoid blocking LoRa startup - GPS on UART1/Serial2: GP8 TX, GP9 RX - Reuses WIZNET_5500_EVB_PICO2 code paths for Ethernet init Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com> * pico2_w5500_e22: rename define and address review feedback Rename WIZNET_5500_EVB_PICO2 to PICO2_W5500_E22 so the variant-specific define matches the variant directory name and isn't confused with an on-board EVB SKU. Review fixes from PR #10135: - Gate the 10 s Ethernet DHCP timeout behind PICO2_W5500_E22 so other Ethernet builds keep the default 60 s behavior; apply the same timeout to reconnectETH() for consistency. - Drop the unused -D EBYTE_E22 flag; EBYTE_E22_900M30S already selects TX_GAIN_LORA / SX126X_MAX_POWER in src/configuration.h. - Rewrite "on-board W5500" comments to describe the external module. - Correct README TX_GAIN_LORA value (7, not 10) and drop the EBYTE_E22 row. * fix(pico2_w5500_e22): drop DEBUG_RP2040_PORT=Serial The arduino-pico framework hooks _write() when DEBUG_RP2040_PORT=Serial is set and dumps raw debug bytes onto USB CDC, corrupting any binary protobuf stream sent through StreamAPI (e.g. `meshtastic --port COMx`). The variant excludes BT and WiFi, so the primary client transport is Ethernet TCP via ethServerAPI — unaffected — but users who configure the node over USB serial would see protobuf decode failures from debug-byte interleaving. Removing the flag restores clean USB CDC. Debug output can still be enabled per-build by adding -D DEBUG_RP2040_PORT=Serial1 to redirect to UART0 instead of USB CDC. * style(pico2_w5500_e22): apply trunk fmt — fixes Trunk Check - variant.h: clang-format 16.0.3 (drop manual #define alignment) - README.md: prettier + add `text` language to fenced code blocks (markdownlint MD040) - wiring.svg: svgo optimization Resolves the Trunk Check Runner failure on this PR (3 unformatted files + 8 markdownlint issues). No functional changes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * refactor(pico2_w5500_e22): address review — move to rp2350/diy, generic guards Maintainer feedback from NomDeTom on PR #10135: - Move the variant from variants/rp2350/ to variants/rp2350/diy/ to distinguish DIY from prebuilt boards (matches the variants/*/diy/ pattern; still discovered via the existing variants/*/diy/*/platformio.ini glob in the root platformio.ini). - Replace the board-name macro PICO2_W5500_E22 in shared code with a generic capability macro USE_ARDUINO_ETHERNET, defined from variant.h. DebugConfiguration.h / ethServerAPI.h / ethClient.cpp no longer reference a board name. - Drop the architecture.h hook entirely: variant.h now defines PRIVATE_HW, which the existing `#elif defined(PRIVATE_HW)` branch already handles. No functional change. Build verified: pico2_w5500_e22 SUCCESS (RAM 19.2%, Flash 28.1%). Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> * chore(pico2_w5500_e22): drop unoptimized wiring.svg to fix trunk fmt check --------- Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com> Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
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Carlos Valdes
co-authored by
GitHub
Claude Sonnet 4.6
Ben Meadors
GitHub
Claude Sonnet 4.6
Ben Meadors
parent
5bce26d9b7
commit
5b7a5b2c22
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# Raspberry Pi Pico 2 + W5500 + E22-900M30S — Meshtastic Variant
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Meshtastic support for a **Raspberry Pi Pico 2** (RP2350, 4 MB flash) with an external **W5500** Ethernet module and an **EBYTE E22-900M30S** LoRa module.
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---
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## Required Hardware
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| Component | Model | Notes |
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| --------- | ------------------- | ---------------------------------------- |
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| MCU | Raspberry Pi Pico 2 | RP2350 @ 150 MHz, 512 KB RAM, 4 MB flash |
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| Ethernet | W5500 module | Any WIZnet W5500 breakout board |
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| LoRa | EBYTE E22-900M30S | SX1262 + 30 dBm PA, 868/915 MHz |
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---
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## Pinout
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### System pins (Pico 2, fixed)
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| GPIO | Function |
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| ---- | --------------------------------------- |
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| GP24 | VBUS sense — HIGH when USB is connected |
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| GP25 | User LED (heartbeat) |
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| GP29 | ADC3 — VSYS/3, measures supply voltage |
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### W5500 Ethernet (SPI0)
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| W5500 signal | Pico 2 GPIO |
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| ------------ | ----------- |
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| MISO | GP16 |
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| CS / SCS | GP17 |
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| SCK | GP18 |
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| MOSI | GP19 |
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| RST | GP20 |
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| INT | — (nc) |
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| VCC | 3.3V |
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| GND | GND |
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> SPI0 is reserved for the W5500.
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### E22-900M30S LoRa (SPI1)
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| E22 signal | Pico 2 GPIO | Notes |
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| ---------- | ----------- | ------------------------------------------ |
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| SCK | GP10 | SPI1 clock |
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| MOSI | GP11 | SPI1 TX |
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| MISO | GP12 | SPI1 RX |
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| NSS / CS | GP13 | Chip select |
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| RESET | GP15 | Active LOW reset |
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| DIO1 | GP14 | IRQ interrupt |
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| BUSY | GP2 | Module busy indicator |
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| RXEN | GP3 | LNA enable — held HIGH permanently |
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| TXEN | ← DIO2 | See wiring note below |
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| VCC | 3.3V | Add a 100 µF capacitor close to the module |
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| GND | GND | — |
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> See `wiring.svg` in this directory for the full connection diagram.
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---
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## Special wiring: DIO2 → TXEN bridge on the E22 module
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The E22-900M30S does **not** connect DIO2 to the TXEN pin of its PA internally. They must be bridged with a short wire or solder bridge **on the module itself**:
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```text
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E22 DIO2 pin ──┐
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├── wire / solder bridge on the module
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E22 TXEN pin ──┘
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```
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With this bridge in place, `SX126X_DIO2_AS_RF_SWITCH` causes the SX1262 to drive DIO2 HIGH automatically during TX, enabling the PA without needing an RP2350 GPIO for TXEN.
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**Without this bridge the module will not transmit.**
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---
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## Build
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```bash
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pio run -e pico2_w5500_e22
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```
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### Flash — BOOTSEL mode
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1. Hold the **BOOTSEL** button on the Pico 2.
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2. Connect USB to the PC — it appears as a `RPI-RP2` storage drive.
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3. Copy the `.uf2` file:
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```text
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.pio/build/pico2_w5500_e22/firmware-pico2_w5500_e22-*.uf2
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```
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Or directly with picotool:
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```bash
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pio run -e pico2_w5500_e22 -t upload
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```
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---
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## Network usage
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This board uses Ethernet (no Wi-Fi). From the Meshtastic app:
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- **Enable Ethernet** under `Config → Network → Ethernet Enabled`
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- **DHCP** by default; static IP can also be configured
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Services available once connected:
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| Service | Details |
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| ------- | --------------------------- |
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| NTP | Time synchronization |
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| MQTT | Messages to external broker |
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| API | TCP socket on port 4403 |
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| Syslog | Remote logging (optional) |
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---
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## Technical notes
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### LoRa — RF control
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| Define | Effect |
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| ------------------------------ | ----------------------------------------------------------- |
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| `SX126X_ANT_SW 3` | GP3 (RXEN) driven HIGH at init and never toggled again |
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| `SX126X_DIO2_AS_RF_SWITCH` | SX1262 drives DIO2 HIGH during TX → enables TXEN via bridge |
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| `SX126X_DIO3_TCXO_VOLTAGE 1.8` | E22 TCXO controlled by DIO3 |
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| `-D EBYTE_E22_900M30S` | Sets `TX_GAIN_LORA=7`, max power 22 dBm |
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> RXEN and TXEN may both be HIGH simultaneously during TX — this is safe for the E22 RF switch.
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### Ethernet
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- Library: `arduino-libraries/Ethernet@^2.0.2` (supports W5100/W5200/W5500 auto-detection).
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- SPI0 is explicitly initialized with pins GP16/18/19 before `Ethernet.init()`.
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- DHCP timeout is set to 10 s (instead of the default 60 s) to avoid blocking LoRa startup.
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### HW_VENDOR
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Mapped to `meshtastic_HardwareModel_PRIVATE_HW` — no dedicated model exists in the Meshtastic protobuf for this hardware combination yet.
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---
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## Memory usage (reference build)
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| Resource | Used | Total | % |
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| -------- | ------ | ------- | ----- |
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| RAM | 94 KB | 512 KB | 18% |
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| Flash | 964 KB | 3.58 MB | 26.3% |
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@@ -0,0 +1,25 @@
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[env:pico2_w5500_e22]
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extends = rp2350_base
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board = rpipico2
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board_level = community
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upload_protocol = picotool
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build_flags =
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${rp2350_base.build_flags}
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-ULED_BUILTIN # avoid "LED_BUILTIN redefined" warnings from framework common.h
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-I variants/rp2350/diy/pico2_w5500_e22
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-D HW_SPI1_DEVICE
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-D EBYTE_E22_900M30S # selects the EBYTE E22-900M30S module config, including TCXO voltage support and TX gain / max power settings
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# Re-enable Ethernet and API source paths excluded in rp2350_base
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build_src_filter = ${rp2350_base.build_src_filter} +<mesh/eth/> +<mesh/api/> +<mqtt/>
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lib_deps =
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${rp2350_base.lib_deps}
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${networking_base.lib_deps}
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${networking_extra.lib_deps}
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# Standard WIZnet Ethernet library — supports W5100/W5200/W5500 auto-detect
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arduino-libraries/Ethernet@^2.0.2
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debug_build_flags = ${rp2350_base.build_flags}, -g
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debug_tool = cmsis-dap
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@@ -0,0 +1,88 @@
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// Raspberry Pi Pico 2 + external W5500 Ethernet module + EBYTE E22-900M30S
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// RP2350 (4 MB flash) — wire modules to the GPIO pins listed below
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//
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// LoRa (SX1262 / E22-900M30S) on SPI1:
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// SCK=GP10 MOSI=GP11 MISO=GP12 CS=GP13
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// RST=GP15 DIO1/IRQ=GP14 BUSY=GP2 RXEN=GP3
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// TXEN: bridge E22_DIO2 → E22_TXEN on the module (no RP2350 GPIO needed)
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//
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// W5500 Ethernet on SPI0:
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// MISO=GP16 CS=GP17 SCK=GP18 MOSI=GP19 RST=GP20
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//
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// See wiring.svg in this directory for a complete connection diagram.
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// Community/DIY board — no dedicated Meshtastic HardwareModel
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#define PRIVATE_HW
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#define ARDUINO_ARCH_AVR
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// Onboard LED (GP25 on Pico 2)
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#define LED_POWER PIN_LED
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// Power monitoring
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// GP24: VBUS sense – HIGH when USB is present (digital read)
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// GP29: ADC3 measures VSYS/3 (200 kΩ / 100 kΩ divider, same as standard Pico 2)
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#define EXT_PWR_DETECT 24
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#define BATTERY_PIN 29
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#define ADC_MULTIPLIER 3.0
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#define BATTERY_SENSE_RESOLUTION_BITS 12
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// No real battery — suppress false "battery at 100%" while USB powers VSYS
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#define NO_BATTERY_LEVEL_ON_CHARGE
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// Optional user button — connect a button between GP6 and GND
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// #define BUTTON_PIN 6
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// #define BUTTON_NEED_PULLUP
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// GPS on UART1 (Serial2) — GP8 TX, GP9 RX
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// GP8/GP9 belong to UART1, so we must use Serial2 (not the default Serial1/UART0).
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// GP0/GP1 (UART0 defaults) are free but the firmware treats pin 0 as "not configured".
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// GP4/GP5 occupied by I2C (SCL/SDA for BMP-280).
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#define HAS_GPS 1
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#define GPS_TX_PIN 8
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#define GPS_RX_PIN 9
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#define GPS_BAUDRATE 38400
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#define GPS_SERIAL_PORT Serial2
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// ---- EBYTE E22-900M30S on SPI1 -----------------------------------------
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#define USE_SX1262
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#undef LORA_SCK
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#undef LORA_MISO
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#undef LORA_MOSI
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#undef LORA_CS
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#define LORA_SCK 10
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#define LORA_MOSI 11
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#define LORA_MISO 12
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#define LORA_CS 13
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#define LORA_DIO0 RADIOLIB_NC
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#define LORA_RESET 15
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#define LORA_DIO1 14 // IRQ
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#define LORA_DIO2 2 // BUSY
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#define LORA_DIO3 RADIOLIB_NC
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#ifdef USE_SX1262
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#define SX126X_CS LORA_CS
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#define SX126X_DIO1 LORA_DIO1
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#define SX126X_BUSY LORA_DIO2
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#define SX126X_RESET LORA_RESET
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// GP3 = RXEN: driven HIGH at init and held there (LNA always enabled).
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// SX1262 drives DIO2 HIGH during TX → TXEN via bridge on E22 module.
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#define SX126X_ANT_SW 3
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#define SX126X_DIO2_AS_RF_SWITCH
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#define SX126X_DIO3_TCXO_VOLTAGE 1.8
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#endif
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// ---- W5500 Ethernet on SPI0 --------------------------------------------
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#define HAS_ETHERNET 1
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// Use the arduino-libraries/Ethernet stack (W5500) instead of RAK13800_W5100S
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#define USE_ARDUINO_ETHERNET 1
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#define ETH_SPI0_MISO 16
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#define ETH_SPI0_SCK 18
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#define ETH_SPI0_MOSI 19
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#define PIN_ETHERNET_RESET 20
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#define PIN_ETHERNET_SS 17
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#define ETH_SPI_PORT SPI
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