kevin
325bc2b2c4
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.
137 lines
4.5 KiB
C
137 lines
4.5 KiB
C
#ifndef _VARIANT_MOONSHINE_NRF52_EBYTE_
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#define _VARIANT_MOONSHINE_NRF52_EBYTE_
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/** Master clock frequency */
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#define VARIANT_MCK (64000000ul)
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#define USE_LFXO // Board uses 32khz crystal for LF
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/*----------------------------------------------------------------------------
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* Headers
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*----------------------------------------------------------------------------*/
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#include "WVariant.h"
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#ifdef __cplusplus
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extern "C" {
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#endif // __cplusplus
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/*
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MOONSHINE NRF52 EBYTE PIN ASSIGNMENT (Ebyte nRF52840 + E22-400M33S)
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| Pin | Function | | Pin | Function |
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| ----- | ----------- | ------ | ----- | ----------- |
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| P0.03 | VBAT_ADC | | P0.22 | SPI_MOSI |
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| P0.04 | IIC_SCL | | P0.24 | BUTTON |
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| P0.08 | IIC_SDA | | P0.28 | LORA_BUSY |
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| P0.13 | CHAG_DET | | P1.00 | SPI_MISO |
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| P0.15 | LED | | P1.09 | LORA_RXEN |
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| P0.17 | LORA_CS | | P1.10 | LORA_DIO1 |
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| P0.20 | SPI_SCK | | P1.11 | BUZZER |
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| | | | P1.13 | LORA_RESET |
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*/
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// Number of pins defined in PinDescription array
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#define PINS_COUNT (48)
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#define NUM_DIGITAL_PINS (48)
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#define NUM_ANALOG_INPUTS (1)
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#define NUM_ANALOG_OUTPUTS (0)
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// No dedicated 3V3 enable pin on this board
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#define PIN_3V3_EN (-1)
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// Analog pins
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#define BATTERY_PIN (0 + 3) // P0.03 / AIN1 Battery ADC
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#define ADC_RESOLUTION 14
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#define BATTERY_SENSE_RESOLUTION_BITS 12
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#define BATTERY_SENSE_RESOLUTION 4096.0
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// Definition of milliVolt per LSB => 3.0V ADC range and 12-bit ADC resolution = 3000mV/4096
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#define VBAT_MV_PER_LSB (0.73242188F)
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// Voltage divider value => equal resistors divider = 0.5
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#define VBAT_DIVIDER (0.5F)
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// Compensation factor for the VBAT divider
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#define VBAT_DIVIDER_COMP (2.0F)
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// Fixed calculation of milliVolt from compensation value
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#define REAL_VBAT_MV_PER_LSB (VBAT_DIVIDER_COMP * VBAT_MV_PER_LSB)
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#undef AREF_VOLTAGE
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#define AREF_VOLTAGE 3.0
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#define VBAT_AR_INTERNAL AR_INTERNAL_3_0
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#define ADC_MULTIPLIER VBAT_DIVIDER_COMP // REAL_VBAT_MV_PER_LSB
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#define VBAT_RAW_TO_SCALED(x) (REAL_VBAT_MV_PER_LSB * x)
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// WIRE IC AND IIC PINS
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#define WIRE_INTERFACES_COUNT 1
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#define PIN_WIRE_SDA (0 + 8) // P0.08
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#define PIN_WIRE_SCL (0 + 4) // P0.04
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// LED - Bluetooth pairing status indicator
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#define LED_PAIRING (0 + 15) // P0.15
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#define LED_STATE_ON 1 // State when LED is lit (active high)
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// Charge detection (P0.13, active high = charging)
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#define EXT_CHRG_DETECT (0 + 13)
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#define EXT_CHRG_DETECT_VALUE HIGH
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// Buzzer
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#define PIN_BUZZER (32 + 11) // P1.11
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// Button
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#define BUTTON_PIN (0 + 24) // P0.24
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// UART interfaces - no physical serial ports wired
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#define PIN_SERIAL1_RX (-1)
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#define PIN_SERIAL1_TX (-1)
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#define PIN_SERIAL2_RX (-1)
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#define PIN_SERIAL2_TX (-1)
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// GPS - no GPS hardware
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#define GPS_RX_PIN (-1)
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#define GPS_TX_PIN (-1)
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#define PIN_GPS_EN (-1)
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#define PIN_GPS_PPS (-1)
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// Serial interfaces
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#define SPI_INTERFACES_COUNT 1
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#define PIN_SPI_MISO (32 + 0) // P1.00
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#define PIN_SPI_MOSI (0 + 22) // P0.22
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#define PIN_SPI_SCK (0 + 20) // P0.20
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#define LORA_MISO PIN_SPI_MISO
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#define LORA_MOSI PIN_SPI_MOSI
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#define LORA_SCK PIN_SPI_SCK
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#define LORA_CS (0 + 17) // P0.17
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// LORA MODULES
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#define USE_SX1268 // E22-400M33S uses SX1268 (433MHz)
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// E22-400M33S: 33dBm/2W module, PA gain varies with power (non-linear)
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// Per E22-M UserManual V1.2 power curve: chip 21dBm -> module 33.5dBm (gain ~12.5dB)
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// TX_GAIN_LORA=12 at max power point; SX126X_MAX_POWER + TX_GAIN_LORA = 33dBm
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#define SX126X_MAX_POWER 21
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#define TX_GAIN_LORA 12
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// SX126X CONFIG
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#define SX126X_CS (0 + 17) // P0.17 FIXME - we really should define LORA_CS instead
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#define SX126X_DIO1 (32 + 10) // P1.10 IRQ
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#define SX126X_DIO2_AS_RF_SWITCH // Note for E22 modules: DIO2 is not attached internally to TXEN for automatic TX/RX switching,
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// so it needs connecting externally if it is used in this way
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#define SX126X_BUSY (0 + 28) // P0.28 (AIN4)
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#define SX126X_RESET (32 + 13) // P1.13
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#define SX126X_RXEN (32 + 9) // P1.09 - E22 RXEN, MCU controls RX/TX RF switch path
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#define SX126X_TXEN RADIOLIB_NC // DIO2 controls TXEN directly
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#define SX126X_DIO3_TCXO_VOLTAGE 1.8
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#define TCXO_OPTIONAL // make it so that the firmware can try both TCXO and XTAL
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#ifdef __cplusplus
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}
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#endif
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/*----------------------------------------------------------------------------
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* Arduino objects - C++ only
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*----------------------------------------------------------------------------*/
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#endif
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