feat: add moonshine_NRF52_ebyte variant (Ebyte nRF52840 + E22-400M33S)
DIY Meshtastic node using an Ebyte nRF52840 MCU module with LFXO crystal
and E22-400M33S LoRa module (SX1268, 433MHz, 33dBm).
Pin assignments:
- LED (LED_PAIRING): P0.15, LED_LORA DIO1: P1.10, BUSY: P0.28 (AIN4)
- LORA_CS: P0.17, RESET: P1.13, RXEN: P1.09, SPI: P0.20/P0.22/P1.00
- VBAT_ADC: P0.03 (0.5 divider), CHAG_DET: P0.13, BUZZER: P1.11
- BUTTON: P0.24, I2C: SDA=P0.08/SCL=P0.04 (wired, no devices)
PA parameters derived from E22-M UserManual V1.2 power curve (not from
E22-900M33S which uses a different PA with 25dB gain):
- SX126X_MAX_POWER=21, TX_GAIN_LORA=12 (chip 21dBm -> module ~33.5dBm)
- DIO2_AS_RF_SWITCH with MCU-controlled RXEN, TCXO 1.8V (TCXO_OPTIONAL)
USB CDC serial enabled by default (nRF52840 built-in). No GPS/screen/
I2C devices. Uses S140 v6 SoftDevice (matches nice!nano bootloader).
Flashable via USB (1200bps touch DFU) or UF2 drag-and-drop.
kevin
325bc2b2c4