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Update Heltec Tracker v2 to version KCT8103L. (#9822)

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* Update Heltec Tracker v2 to version KCT8103L.

* Fixed the issue of inaccurate comments.

---------

Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
This commit is contained in:
Quency-D
2026-03-06 06:15:42 -06:00
committed by GitHub
co-authored by GitHub Ben Meadors
parent cb28c38828
commit 3d524be965
5 changed files with 64 additions and 30 deletions
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variants/esp32s3/heltec_v4/variant.h
+2 -2
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@@ -65,12 +65,12 @@
// Pin mapping:
// CPS (pin 5) -> SX1262 DIO2: TX/RX path select (automatic via SX126X_DIO2_AS_RF_SWITCH)
// CSD (pin 4) -> GPIO2: Chip enable (HIGH=on, LOW=shutdown)
// CTX (pin 6) -> GPIO5: Switch between Receive LNA Mode and Receive Bypass Mode. (HIGH=bypass PA, LOW=LNA)
// CTX (pin 6) -> GPIO5: Switch between Receive LNA Mode and Receive Bypass Mode. (HIGH=RX bypass, LOW=RX LNA)
// VCC0/VCC1 -> Vfem via U3 LDO, controlled by GPIO7
// KCT8103L FEM: TX/RX path switching is handled by DIO2 -> CPS pin (via SX126X_DIO2_AS_RF_SWITCH)
#define LORA_KCT8103L_PA_CSD 2 // CSD - KCT8103L chip enable (HIGH=on)
#define LORA_KCT8103L_PA_CTX 5 // CTX - Switch between Receive LNA Mode and Receive Bypass Mode. (HIGH=bypass PA, LOW=LNA)
#define LORA_KCT8103L_PA_CTX 5 // CTX - Switch between Receive LNA Mode and Receive Bypass Mode. (HIGH=RX bypass, LOW=RX LNA)
#if HAS_TFT
#define USE_TFTDISPLAY 1
variants/esp32s3/heltec_wireless_tracker_v2/pins_arduino.h
+2 -2
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@@ -13,8 +13,8 @@
static const uint8_t TX = 43;
static const uint8_t RX = 44;
static const uint8_t SDA = 5;
static const uint8_t SCL = 6;
static const uint8_t SDA = 6;
static const uint8_t SCL = 17;
static const uint8_t SS = 8;
static const uint8_t MOSI = 10;
variants/esp32s3/heltec_wireless_tracker_v2/variant.h
+14 -21
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@@ -73,29 +73,22 @@
#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):
// ---- KCT8103L RF FRONT END CONFIGURATION ----
// The heltec_wireless_tracker_v2 uses a KCT8103L FEM chip with integrated PA and LNA
// RF path: SX1262 -> Pi attenuator -> KCT8103L PA -> Antenna
// Control logic (from KCT8103L datasheet):
// Transmit PA: CSD=1, CTX=1, CPS=1
// Receive LNA: CSD=1, CTX=0, CPS=X (21dB gain, 1.9dB NF)
// Receive bypass: CSD=1, CTX=1, CPS=0
// 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)
// CPS (pin 5) -> 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)
// CTX (pin 6) -> GPIO5: Switch between Receive LNA Mode and Receive Bypass Mode. (HIGH=RX bypass, LOW=RX LNA)
// 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_GC1109_PA_EN 4 // CSD - GC1109 chip enable (HIGH=on)
#define LORA_GC1109_PA_TX_EN 46 // CPS - GC1109 PA mode (HIGH=full PA, LOW=bypass)
// KCT8103L FEM: TX/RX path switching is handled by DIO2 -> CPS pin (via SX126X_DIO2_AS_RF_SWITCH)
// 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
#define USE_KCT8103L_PA
#define LORA_PA_POWER 7 // VFEM_Ctrl - KCT8103L LDO power enable
#define LORA_KCT8103L_PA_CSD 4 // CSD - KCT8103L chip enable (HIGH=on)
#define LORA_KCT8103L_PA_CTX 5 // CTX - Switch between Receive LNA Mode and Receive Bypass Mode. (HIGH=RX bypass, LOW=RX LNA)