mirror of
https://github.com/meshtastic/firmware.git
synced 2026-01-17 07:17:32 +00:00
6e110788fd
* Fix LNA/PA power control for Heltec v4, wireless tracker v2 * Stop using pin 46 as RF switch, just let DIO2 switch handle the RF path --------- Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
101 lines
3.6 KiB
C
101 lines
3.6 KiB
C
#define LED_PIN 18
|
|
|
|
#define _VARIANT_HELTEC_WIRELESS_TRACKER
|
|
|
|
// I2C
|
|
#define I2C_SDA SDA
|
|
#define I2C_SCL SCL
|
|
|
|
// ST7735S TFT LCD
|
|
#define ST7735S 1 // there are different (sub-)versions of ST7735
|
|
#define ST7735_CS 38
|
|
#define ST7735_RS 40 // DC
|
|
#define ST7735_SDA 42 // MOSI
|
|
#define ST7735_SCK 41
|
|
#define ST7735_RESET 39
|
|
#define ST7735_MISO -1
|
|
#define ST7735_BUSY -1
|
|
#define TFT_BL 21
|
|
#define ST7735_SPI_HOST SPI3_HOST
|
|
#define SPI_FREQUENCY 40000000
|
|
#define SPI_READ_FREQUENCY 16000000
|
|
#define SCREEN_ROTATE
|
|
#define TFT_HEIGHT DISPLAY_WIDTH
|
|
#define TFT_WIDTH DISPLAY_HEIGHT
|
|
#define TFT_OFFSET_X 24
|
|
#define TFT_OFFSET_Y 0
|
|
#define TFT_INVERT false
|
|
#define SCREEN_TRANSITION_FRAMERATE 3 // fps
|
|
#define DISPLAY_FORCE_SMALL_FONTS
|
|
#define USE_TFTDISPLAY 1
|
|
|
|
#define VEXT_ENABLE 3 // active HIGH - powers the GPS, GPS LNA and OLED
|
|
#define VEXT_ON_VALUE HIGH
|
|
#define BUTTON_PIN 0
|
|
|
|
#define BATTERY_PIN 1 // A battery voltage measurement pin, voltage divider connected here to measure battery voltage
|
|
#define ADC_CHANNEL ADC1_GPIO1_CHANNEL
|
|
#define ADC_ATTENUATION ADC_ATTEN_DB_2_5 // lower dB for high resistance voltage divider
|
|
#define ADC_MULTIPLIER 4.9 * 1.045
|
|
#define ADC_CTRL 2 // active HIGH, powers the voltage divider.
|
|
#define ADC_USE_PULLUP // Use internal pullup/pulldown instead of actively driving the output
|
|
|
|
#undef GPS_RX_PIN
|
|
#undef GPS_TX_PIN
|
|
#define GPS_RX_PIN 33
|
|
#define GPS_TX_PIN 34
|
|
#define PIN_GPS_RESET 35
|
|
#define PIN_GPS_PPS 36
|
|
// #define PIN_GPS_EN 3 // Uncomment to power off the GPS with triple-click on Tracker v2, though we'll also lose the
|
|
// display.
|
|
|
|
#define GPS_RESET_MODE LOW
|
|
#define GPS_UC6580
|
|
#define GPS_BAUDRATE 115200
|
|
|
|
#define USE_SX1262
|
|
#define LORA_DIO0 -1 // a No connect on the SX1262 module
|
|
#define LORA_RESET 12
|
|
#define LORA_DIO1 14 // SX1262 IRQ
|
|
#define LORA_DIO2 13 // SX1262 BUSY
|
|
#define LORA_DIO3 // Not connected on PCB, but internally on the TTGO SX1262, if DIO3 is high the TCXO is enabled
|
|
|
|
#define LORA_SCK 9
|
|
#define LORA_MISO 11
|
|
#define LORA_MOSI 10
|
|
#define LORA_CS 8
|
|
|
|
#define SX126X_CS LORA_CS
|
|
#define SX126X_DIO1 LORA_DIO1
|
|
#define SX126X_BUSY LORA_DIO2
|
|
#define SX126X_RESET LORA_RESET
|
|
|
|
#define SX126X_DIO2_AS_RF_SWITCH
|
|
#define SX126X_DIO3_TCXO_VOLTAGE 1.8
|
|
|
|
// ---- GC1109 RF FRONT END CONFIGURATION ----
|
|
// The Heltec Wireless Tracker V2 uses a GC1109 FEM chip with integrated PA and LNA
|
|
// RF path: SX1262 -> GC1109 PA -> Pi attenuator -> Antenna
|
|
// Measured net TX gain (non-linear due to PA compression):
|
|
// +11dB at 0-15dBm input (e.g., 10dBm in -> 21dBm out)
|
|
// +10dB at 16-17dBm input
|
|
// +9dB at 18-19dBm input
|
|
// +7dB at 21dBm input (e.g., 21dBm in -> 28dBm out max)
|
|
// Control logic (from GC1109 datasheet):
|
|
// Shutdown: CSD=0, CTX=X, CPS=X
|
|
// Receive LNA: CSD=1, CTX=0, CPS=X (17dB gain, 2dB NF)
|
|
// Transmit bypass: CSD=1, CTX=1, CPS=0 (~1dB loss, no PA)
|
|
// Transmit PA: CSD=1, CTX=1, CPS=1 (full PA enabled)
|
|
// Pin mapping:
|
|
// CTX (pin 6) -> SX1262 DIO2: TX/RX path select (automatic via SX126X_DIO2_AS_RF_SWITCH)
|
|
// CSD (pin 4) -> GPIO4: Chip enable (HIGH=on, LOW=shutdown)
|
|
// CPS (pin 5) -> GPIO46: PA mode select (HIGH=full PA, LOW=bypass)
|
|
// VCC0/VCC1 -> Vfem via U3 LDO, controlled by GPIO7
|
|
#define USE_GC1109_PA
|
|
#define LORA_PA_POWER 7 // VFEM_Ctrl - GC1109 LDO power enable
|
|
#define LORA_PA_EN 4 // CSD - GC1109 chip enable (HIGH=on)
|
|
#define LORA_PA_TX_EN 46 // CPS - GC1109 PA mode (HIGH=full PA, LOW=bypass)
|
|
|
|
// GC1109 FEM: TX/RX path switching is handled by DIO2 -> CTX pin (via SX126X_DIO2_AS_RF_SWITCH)
|
|
// GPIO46 is CPS (PA mode), not TX control - setTransmitEnable() handles it in SX126xInterface.cpp
|
|
// Do NOT use SX126X_TXEN/RXEN as that would cause double-control of GPIO46
|