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Tom
2026-07-01 19:01:27 -05:00
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variants/nrf54l15/nrf54l15dk/README.md
+21 -20
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@@ -1,4 +1,4 @@
# nRF54L15-DK — EBYTE E22-900M30S Wiring Guide
# nRF54L15-DK - EBYTE E22-900M30S Wiring Guide
Board: **Nordic nRF54L15-DK (PCA10156)**
Radio: **EBYTE E22-900M30S** (SX1262, 30 dBm, 868/915 MHz)
@@ -9,9 +9,9 @@ Radio: **EBYTE E22-900M30S** (SX1262, 30 dBm, 868/915 MHz)
The nRF54L15 splits its GPIOs across three supply domains:
- **P0** — Main domain, **3.0 V** — usable
- **P1** — LP domain, **1.8 V** — **not compatible** with the SX1262
- **P2** — HP domain, **3.0 V** — usable
- **P0** - Main domain, **3.0 V** - usable
- **P1** - LP domain, **1.8 V** - **not compatible** with the SX1262
- **P2** - HP domain, **3.0 V** - usable
The SX1262 requires VIH ≥ 0.7 × VDD (≈ 2.31 V at VDD = 3.3 V). P1's 1.8 V output
leaves the chip stuck in reset with `BUSY` never going LOW. All E22 signals
@@ -19,24 +19,25 @@ therefore live on **P2** and are driven by **SPIM00**.
> `P2.09` is normally wired to LED0 on the DK; we ignore the LED and use
> SPIM00's default MISO pin. The on-board MX25R64 NOR flash also sat on SPIM00
> — it is deleted in the device-tree overlay to free the bus.
>
> - it is deleted in the device-tree overlay to free the bus.
---
## Connections — J2 header, P2 bank
## Connections - J2 header, P2 bank
| E22-900M30S | GPIO | DK pin | Function |
| ----------- | ----- | ------ | ---------------------------------------------- |
| MISO | P2.04 | 36 | SPIM00 data in |
| NSS / CS | P2.05 | 37 | SPI chip-select (driven by RadioLib as a GPIO) |
| DIO1 | P2.06 | 38 | IRQ — modem interrupt (routed via gpiote30) |
| DIO1 | P2.06 | 38 | IRQ - modem interrupt (routed via gpiote30) |
| BUSY | P2.03 | 35 | Module busy (GPIO input) |
| NRESET | P2.00 | 32 | Module reset (GPIO output, active LOW) |
| RXEN | P2.07 | 39 | LNA enable — held HIGH via `SX126X_ANT_SW` |
| RXEN | P2.07 | 39 | LNA enable - held HIGH via `SX126X_ANT_SW` |
| MOSI | P2.02 | 34 | SPIM00 data out |
| SCK | P2.01 | 33 | SPIM00 clock |
| GND | — | GND | Common ground |
| VCC | — | VDD | 3.3 V |
| GND | - | GND | Common ground |
| VCC | - | VDD | 3.3 V |
> **Numbering convention**: `P0.n = n`, `P1.n = 16+n`, `P2.n = 32+n`.
> Example: `P2.04` → 32 + 4 = **36**.
@@ -55,27 +56,27 @@ Without this bridge the module **will not transmit** (PA is never enabled).
---
## RXEN — LNA always on
## RXEN - LNA always on
`RXEN` (P2.07) is held HIGH permanently via `SX126X_ANT_SW 39` in `variant.h`.
**Do not use** `SX126X_RXEN` — RadioLib would drive it LOW in IDLE state and
**Do not use** `SX126X_RXEN` - RadioLib would drive it LOW in IDLE state and
the LNA would stay disabled (radio deaf in RX).
---
## Reserved DK pins — do not reuse
## Reserved DK pins - do not reuse
| Pins | Reserved function |
| ----------- | -------------------------------------------------------- |
| P0.00–P0.03 | IMCU debug UART (uart30, J-Link VCOM — used by RTT host) |
| P0.00-P0.03 | IMCU debug UART (uart30, J-Link VCOM - used by RTT host) |
| P0.04 | BTN3 |
| P1.00–P1.01 | 32 kHz crystal |
| P1.02–P1.03 | NFC antenna |
| P1.10 | LED1 (status LED — kept) |
| P1.00-P1.01 | 32 kHz crystal |
| P1.02-P1.03 | NFC antenna |
| P1.10 | LED1 (status LED - kept) |
| P1.13 | BTN0 (only remaining user button) |
| P1.14 | LED3 |
| P2.01–P2.05 | SPIM00 / E22 (see connection table above) |
| P2.08–P2.10 | Trace ETM / LED2 (avoid) |
| P2.01-P2.05 | SPIM00 / E22 (see connection table above) |
| P2.08-P2.10 | Trace ETM / LED2 (avoid) |
---
@@ -104,5 +105,5 @@ INFO | ... lora.begin() = 0 ← RADIOLIB_ERR_NONE
```
If you see `Record critical error 3` (`NO_RADIO`), check: DIO2→TXEN bridge,
supply voltages (the E22 must see 3.0–3.3 V on P2, not 1.8 V), and SPI wiring
supply voltages (the E22 must see 3.0-3.3 V on P2, not 1.8 V), and SPI wiring
continuity.