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Add heltec-v4.3 board (#9753)

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* Add heltec-v4.3 board

* Modify LNA control display content

* Fix Heltec Tracker v2 FEM control

* Use trunk to fix formatting issues.

* Optimize the fem initialization control logic.

* Update src/mesh/RadioInterface.h change #ifdef to #if

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Change LORA_PA_EN to LORA_GC1109_PA_EN.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Remove the NodeDB.h include.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Change tx_gain to a const variable.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Fixed the issue where ARCH_PORTDUINO lacked the NUM_PA_POINTS macro.

* Remove the comment.

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

* Move #pragma once to the first line.

* Remove the FEM LNA control menu.

* Add description for KCT8103L.

---------

Co-authored-by: Thomas Göttgens <tgoettgens@gmail.com>
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
Co-authored-by: Ben Meadors <benmmeadors@gmail.com>
This commit is contained in:
Quency-D
2026-03-04 06:27:12 -06:00
committed by GitHub
co-authored by GitHub Thomas Göttgens Copilot Ben Meadors
parent b7bf251798
commit 5ced739a57
11 changed files with 281 additions and 76 deletions
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src/configuration.h
+4
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@@ -163,6 +163,10 @@ along with this program. If not, see <http://www.gnu.org/licenses/>.
#define TX_GAIN_LORA 0
#endif
#ifndef HAS_LORA_FEM
#define HAS_LORA_FEM 0
#endif
// -----------------------------------------------------------------------------
// Feature toggles
// -----------------------------------------------------------------------------
src/mesh/LoRaFEMInterface.cpp
+193
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@@ -0,0 +1,193 @@
#if HAS_LORA_FEM
#include "LoRaFEMInterface.h"
#if defined(ARCH_ESP32)
#include <driver/rtc_io.h>
#include <esp_sleep.h>
#endif
LoRaFEMInterface loraFEMInterface;
void LoRaFEMInterface::init(void)
{
setLnaCanControl(false); // Default is uncontrollable
#ifdef HELTEC_V4
pinMode(LORA_PA_POWER, OUTPUT);
digitalWrite(LORA_PA_POWER, HIGH);
rtc_gpio_hold_dis((gpio_num_t)LORA_PA_POWER);
delay(1);
rtc_gpio_hold_dis((gpio_num_t)LORA_KCT8103L_PA_CSD);
pinMode(LORA_KCT8103L_PA_CSD, INPUT); // detect which FEM is used
delay(1);
if (digitalRead(LORA_KCT8103L_PA_CSD) == HIGH) {
// FEM is KCT8103L
fem_type = KCT8103L_PA;
rtc_gpio_hold_dis((gpio_num_t)LORA_KCT8103L_PA_CTX);
pinMode(LORA_KCT8103L_PA_CSD, OUTPUT);
digitalWrite(LORA_KCT8103L_PA_CSD, HIGH);
pinMode(LORA_KCT8103L_PA_CTX, OUTPUT);
digitalWrite(LORA_KCT8103L_PA_CTX, HIGH);
setLnaCanControl(true);
} else if (digitalRead(LORA_KCT8103L_PA_CSD) == LOW) {
// FEM is GC1109
fem_type = GC1109_PA;
// LORA_GC1109_PA_EN and LORA_KCT8103L_PA_CSD are the same pin and do not need to be repeatedly turned off and held.
// rtc_gpio_hold_dis((gpio_num_t)LORA_GC1109_PA_EN);
pinMode(LORA_GC1109_PA_EN, OUTPUT);
digitalWrite(LORA_GC1109_PA_EN, HIGH);
pinMode(LORA_GC1109_PA_TX_EN, OUTPUT);
digitalWrite(LORA_GC1109_PA_TX_EN, LOW);
} else {
fem_type = OTHER_FEM_TYPES;
}
#elif defined(USE_GC1109_PA)
fem_type = GC1109_PA;
#if defined(ARCH_ESP32)
rtc_gpio_hold_dis((gpio_num_t)LORA_PA_POWER);
rtc_gpio_hold_dis((gpio_num_t)LORA_GC1109_PA_EN);
rtc_gpio_hold_dis((gpio_num_t)LORA_GC1109_PA_TX_EN);
#endif
pinMode(LORA_PA_POWER, OUTPUT);
digitalWrite(LORA_PA_POWER, HIGH);
delay(1);
pinMode(LORA_GC1109_PA_EN, OUTPUT);
digitalWrite(LORA_GC1109_PA_EN, HIGH);
pinMode(LORA_GC1109_PA_TX_EN, OUTPUT);
digitalWrite(LORA_GC1109_PA_TX_EN, LOW);
#endif
}
void LoRaFEMInterface::setSleepModeEnable(void)
{
#ifdef HELTEC_V4
if (fem_type == GC1109_PA) {
/*
* Do not switch the power on and off frequently.
* After turning off LORA_GC1109_PA_EN, the power consumption has dropped to the uA level.
*/
digitalWrite(LORA_GC1109_PA_EN, LOW);
digitalWrite(LORA_GC1109_PA_TX_EN, LOW);
} else if (fem_type == KCT8103L_PA) {
// shutdown the PA
digitalWrite(LORA_KCT8103L_PA_CSD, LOW);
}
#elif defined(USE_GC1109_PA)
digitalWrite(LORA_GC1109_PA_EN, LOW);
digitalWrite(LORA_GC1109_PA_TX_EN, LOW);
#endif
}
void LoRaFEMInterface::setTxModeEnable(void)
{
#ifdef HELTEC_V4
if (fem_type == GC1109_PA) {
digitalWrite(LORA_GC1109_PA_EN, HIGH); // CSD=1: Chip enabled
digitalWrite(LORA_GC1109_PA_TX_EN, HIGH); // CPS: 1=full PA, 0=bypass (for RX, CPS is don't care)
} else if (fem_type == KCT8103L_PA) {
digitalWrite(LORA_KCT8103L_PA_CSD, HIGH);
digitalWrite(LORA_KCT8103L_PA_CTX, HIGH);
}
#elif defined(USE_GC1109_PA)
digitalWrite(LORA_GC1109_PA_EN, HIGH); // CSD=1: Chip enabled
digitalWrite(LORA_GC1109_PA_TX_EN, HIGH); // CPS: 1=full PA, 0=bypass (for RX, CPS is don't care)
#endif
}
void LoRaFEMInterface::setRxModeEnable(void)
{
#ifdef HELTEC_V4
if (fem_type == GC1109_PA) {
digitalWrite(LORA_GC1109_PA_EN, HIGH); // CSD=1: Chip enabled
digitalWrite(LORA_GC1109_PA_TX_EN, LOW);
} else if (fem_type == KCT8103L_PA) {
digitalWrite(LORA_KCT8103L_PA_CSD, HIGH);
if (lna_enabled) {
digitalWrite(LORA_KCT8103L_PA_CTX, LOW);
} else {
digitalWrite(LORA_KCT8103L_PA_CTX, HIGH);
}
}
#elif defined(USE_GC1109_PA)
digitalWrite(LORA_GC1109_PA_EN, HIGH); // CSD=1: Chip enabled
digitalWrite(LORA_GC1109_PA_TX_EN, LOW);
#endif
}
void LoRaFEMInterface::setRxModeEnableWhenMCUSleep(void)
{
#ifdef HELTEC_V4
// Keep GC1109 FEM powered during deep sleep so LNA remains active for RX wake.
// Set PA_POWER and PA_EN HIGH (overrides SX126xInterface::sleep() shutdown),
// then latch with RTC hold so the state survives deep sleep.
digitalWrite(LORA_PA_POWER, HIGH);
rtc_gpio_hold_en((gpio_num_t)LORA_PA_POWER);
if (fem_type == GC1109_PA) {
digitalWrite(LORA_GC1109_PA_EN, HIGH);
rtc_gpio_hold_en((gpio_num_t)LORA_GC1109_PA_EN);
gpio_pulldown_en((gpio_num_t)LORA_GC1109_PA_TX_EN);
} else if (fem_type == KCT8103L_PA) {
digitalWrite(LORA_KCT8103L_PA_CSD, HIGH);
rtc_gpio_hold_en((gpio_num_t)LORA_KCT8103L_PA_CSD);
if (lna_enabled) {
digitalWrite(LORA_KCT8103L_PA_CTX, LOW);
} else {
digitalWrite(LORA_KCT8103L_PA_CTX, HIGH);
}
rtc_gpio_hold_en((gpio_num_t)LORA_KCT8103L_PA_CTX);
}
#elif defined(USE_GC1109_PA)
digitalWrite(LORA_PA_POWER, HIGH);
digitalWrite(LORA_GC1109_PA_EN, HIGH);
#if defined(ARCH_ESP32)
rtc_gpio_hold_en((gpio_num_t)LORA_PA_POWER);
rtc_gpio_hold_en((gpio_num_t)LORA_GC1109_PA_EN);
gpio_pulldown_en((gpio_num_t)LORA_GC1109_PA_TX_EN);
#endif
#endif
}
void LoRaFEMInterface::setLNAEnable(bool enabled)
{
lna_enabled = enabled;
}
int8_t LoRaFEMInterface::powerConversion(int8_t loraOutputPower)
{
#ifdef HELTEC_V4
const uint16_t gc1109_tx_gain[] = {11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 9, 9, 8, 7};
const uint16_t kct8103l_tx_gain[] = {13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 11, 11, 10, 9, 8, 7};
const uint16_t *tx_gain;
uint16_t tx_gain_num;
if (fem_type == GC1109_PA) {
tx_gain = gc1109_tx_gain;
tx_gain_num = sizeof(gc1109_tx_gain) / sizeof(gc1109_tx_gain[0]);
} else if (fem_type == KCT8103L_PA) {
tx_gain = kct8103l_tx_gain;
tx_gain_num = sizeof(kct8103l_tx_gain) / sizeof(kct8103l_tx_gain[0]);
} else {
return loraOutputPower;
}
#else
#ifdef ARCH_PORTDUINO
size_t num_pa_points = portduino_config.num_pa_points;
const uint16_t *tx_gain = portduino_config.tx_gain_lora;
uint16_t tx_gain_num = num_pa_points;
#else
size_t num_pa_points = NUM_PA_POINTS;
const uint16_t tx_gain[NUM_PA_POINTS] = {TX_GAIN_LORA};
uint16_t tx_gain_num = NUM_PA_POINTS;
#endif
#endif
for (int radio_dbm = 0; radio_dbm < tx_gain_num; radio_dbm++) {
if (((radio_dbm + tx_gain[radio_dbm]) > loraOutputPower) ||
((radio_dbm == (tx_gain_num - 1)) && ((radio_dbm + tx_gain[radio_dbm]) <= loraOutputPower))) {
// we've exceeded the power limit, or hit the max we can do
LOG_INFO("Requested Tx power: %d dBm; Device LoRa Tx gain: %d dB", loraOutputPower, tx_gain[radio_dbm]);
loraOutputPower -= tx_gain[radio_dbm];
break;
}
}
return loraOutputPower;
}
#endif
src/mesh/LoRaFEMInterface.h
+30
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@@ -0,0 +1,30 @@
#pragma once
#if HAS_LORA_FEM
#include "configuration.h"
#include <stdint.h>
typedef enum { GC1109_PA, KCT8103L_PA, OTHER_FEM_TYPES } LoRaFEMType;
class LoRaFEMInterface
{
public:
LoRaFEMInterface() {}
virtual ~LoRaFEMInterface() {}
void init(void);
void setSleepModeEnable(void);
void setTxModeEnable(void);
void setRxModeEnable(void);
void setRxModeEnableWhenMCUSleep(void);
void setLNAEnable(bool enabled);
int8_t powerConversion(int8_t loraOutputPower);
bool isLnaCanControl(void) { return lna_can_control; }
void setLnaCanControl(bool can_control) { lna_can_control = can_control; }
private:
LoRaFEMType fem_type;
bool lna_enabled = false;
bool lna_can_control = false;
};
extern LoRaFEMInterface loraFEMInterface;
#endif
src/mesh/RadioInterface.cpp
+7 -1
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@@ -915,6 +915,12 @@ void RadioInterface::limitPower(int8_t loraMaxPower)
power = maxPower;
}
#if HAS_LORA_FEM
if (!devicestate.owner.is_licensed) {
power = loraFEMInterface.powerConversion(power);
}
#else
// todo:All entries containing "lora fem" are grouped together above.
#ifdef ARCH_PORTDUINO
size_t num_pa_points = portduino_config.num_pa_points;
const uint16_t *tx_gain = portduino_config.tx_gain_lora;
@@ -940,7 +946,7 @@ void RadioInterface::limitPower(int8_t loraMaxPower)
}
}
}
#endif
if (power > loraMaxPower) // Clamp power to maximum defined level
power = loraMaxPower;
src/mesh/RadioInterface.h
+4
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@@ -8,6 +8,10 @@
#include "error.h"
#include <memory>
#if HAS_LORA_FEM
#include "LoRaFEMInterface.h"
#endif
// Forward decl to avoid a direct include of generated config headers / full LoRaConfig definition in this widely-included file.
typedef struct _meshtastic_Config_LoRaConfig meshtastic_Config_LoRaConfig;
src/mesh/SX126xInterface.cpp
+12 -48
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@@ -6,7 +6,7 @@
#ifdef ARCH_PORTDUINO
#include "PortduinoGlue.h"
#endif
#if defined(USE_GC1109_PA) && defined(ARCH_ESP32)
#if defined(ARCH_ESP32)
#include <driver/rtc_io.h>
#include <esp_sleep.h>
#endif
@@ -56,41 +56,8 @@ template <typename T> bool SX126xInterface<T>::init()
pinMode(SX126X_POWER_EN, OUTPUT);
#endif
#if defined(USE_GC1109_PA)
// GC1109 FEM chip initialization
// See variant.h for full pin mapping and control logic documentation
//
// On deep sleep wake, PA_POWER and PA_EN are held HIGH by RTC latch (set in
// enableLoraInterrupt). We configure GPIO registers before releasing the hold
// so the pad transitions atomically from held-HIGH to register-HIGH with no
// power glitch. On cold boot the hold_dis is a harmless no-op.
// VFEM_Ctrl (LORA_PA_POWER): Power enable for GC1109 LDO (always on)
pinMode(LORA_PA_POWER, OUTPUT);
digitalWrite(LORA_PA_POWER, HIGH);
rtc_gpio_hold_dis((gpio_num_t)LORA_PA_POWER);
// TLV75733P LDO has ~550us startup time (datasheet tSTR). On cold boot, wait
// for VBAT to stabilise before driving CSD/CPS, per GC1109 requirement:
// "VBAT must be prior to CSD/CPS/CTX for the power on sequence"
// On deep sleep wake the LDO was held on via RTC latch, so no delay needed.
#if defined(ARCH_ESP32)
if (esp_sleep_get_wakeup_cause() == ESP_SLEEP_WAKEUP_UNDEFINED) {
delayMicroseconds(1000);
}
#else
delayMicroseconds(1000);
#endif
// CSD (LORA_PA_EN): Chip enable - must be HIGH to enable GC1109 for both RX and TX
pinMode(LORA_PA_EN, OUTPUT);
digitalWrite(LORA_PA_EN, HIGH);
rtc_gpio_hold_dis((gpio_num_t)LORA_PA_EN);
// CPS (LORA_PA_TX_EN): PA mode select - HIGH enables full PA during TX, LOW for RX (don't care)
// Note: TX/RX path switching (CTX) is handled by DIO2 via SX126X_DIO2_AS_RF_SWITCH
pinMode(LORA_PA_TX_EN, OUTPUT);
digitalWrite(LORA_PA_TX_EN, LOW); // Start in RX-ready state
#if HAS_LORA_FEM
loraFEMInterface.init();
#endif
#ifdef RF95_FAN_EN
@@ -419,15 +386,10 @@ template <typename T> bool SX126xInterface<T>::sleep()
digitalWrite(SX126X_POWER_EN, LOW);
#endif
#if defined(USE_GC1109_PA)
/*
* Do not switch the power on and off frequently.
* After turning off LORA_PA_EN, the power consumption has dropped to the uA level.
* // digitalWrite(LORA_PA_POWER, LOW);
*/
digitalWrite(LORA_PA_EN, LOW);
digitalWrite(LORA_PA_TX_EN, LOW);
#if HAS_LORA_FEM
loraFEMInterface.setSleepModeEnable();
#endif
return true;
}
@@ -489,10 +451,12 @@ template <typename T> void SX126xInterface<T>::resetAGC()
/** Control PA mode for GC1109 FEM - CPS pin selects full PA (txon=true) or bypass mode (txon=false) */
template <typename T> void SX126xInterface<T>::setTransmitEnable(bool txon)
{
#if defined(USE_GC1109_PA)
digitalWrite(LORA_PA_POWER, HIGH); // Ensure LDO is on
digitalWrite(LORA_PA_EN, HIGH); // CSD=1: Chip enabled
digitalWrite(LORA_PA_TX_EN, txon ? 1 : 0); // CPS: 1=full PA, 0=bypass (for RX, CPS is don't care)
#if HAS_LORA_FEM
if (txon) {
loraFEMInterface.setTxModeEnable();
} else {
loraFEMInterface.setRxModeEnable();
}
#endif
}
src/sleep.cpp
+2 -16
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@@ -163,13 +163,6 @@ void initDeepSleep()
if (wakeCause != ESP_SLEEP_WAKEUP_UNDEFINED) {
LOG_DEBUG("Disable any holds on RTC IO pads");
for (uint8_t i = 0; i <= GPIO_NUM_MAX; i++) {
#if defined(USE_GC1109_PA)
// Skip GC1109 FEM power pins - they are held HIGH during deep sleep to keep
// the LNA active for RX wake. Released later in SX126xInterface::init() after
// GPIO registers are set HIGH first, avoiding a power glitch.
if (i == LORA_PA_POWER || i == LORA_PA_EN)
continue;
#endif
if (rtc_gpio_is_valid_gpio((gpio_num_t)i))
rtc_gpio_hold_dis((gpio_num_t)i);
@@ -567,15 +560,8 @@ void enableLoraInterrupt()
gpio_pullup_en((gpio_num_t)LORA_CS);
#endif
#if defined(USE_GC1109_PA)
// Keep GC1109 FEM powered during deep sleep so LNA remains active for RX wake.
// Set PA_POWER and PA_EN HIGH (overrides SX126xInterface::sleep() shutdown),
// then latch with RTC hold so the state survives deep sleep.
digitalWrite(LORA_PA_POWER, HIGH);
rtc_gpio_hold_en((gpio_num_t)LORA_PA_POWER);
digitalWrite(LORA_PA_EN, HIGH);
rtc_gpio_hold_en((gpio_num_t)LORA_PA_EN);
gpio_pulldown_en((gpio_num_t)LORA_PA_TX_EN);
#if HAS_LORA_FEM
loraFEMInterface.setRxModeEnableWhenMCUSleep();
#endif
LOG_INFO("setup LORA_DIO1 (GPIO%02d) with wakeup by gpio interrupt", LORA_DIO1);
variants/esp32s3/heltec_v4/platformio.ini
+1
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@@ -6,6 +6,7 @@ board_build.partitions = default_16MB.csv
build_flags =
${esp32s3_base.build_flags}
-D HELTEC_V4
-D HAS_LORA_FEM=1
-I variants/esp32s3/heltec_v4
variants/esp32s3/heltec_v4/variant.h
+24 -8
View File
@@ -30,8 +30,8 @@
#define SX126X_DIO3_TCXO_VOLTAGE 1.8
// ---- GC1109 RF FRONT END CONFIGURATION ----
// The Heltec V4 uses a GC1109 FEM chip with integrated PA and LNA
// RF path: SX1262 -> GC1109 PA -> Pi attenuator -> Antenna
// The Heltec V4.2 uses a GC1109 FEM chip with integrated PA and LNA
// RF path: SX1262 -> Pi attenuator -> GC1109 PA -> 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
@@ -47,15 +47,31 @@
// CSD (pin 4) -> GPIO2: 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 2 // 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
#define LORA_PA_POWER 7 // VFEM_Ctrl - GC1109 and KCT8103L LDO power enable
#define LORA_GC1109_PA_EN 2 // CSD - GC1109 chip enable (HIGH=on)
#define LORA_GC1109_PA_TX_EN 46 // CPS - GC1109 PA mode (HIGH=full PA, LOW=bypass)
// ---- KCT8103L RF FRONT END CONFIGURATION ----
// The Heltec V4.3 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
// 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)
// 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)
#if HAS_TFT
#define USE_TFTDISPLAY 1
#endif
variants/esp32s3/heltec_wireless_tracker_v2/platformio.ini
+1
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@@ -17,6 +17,7 @@ build_flags =
${esp32s3_base.build_flags}
-I variants/esp32s3/heltec_wireless_tracker_v2
-D HELTEC_WIRELESS_TRACKER_V2
-D HAS_LORA_FEM=1
lib_deps =
${esp32s3_base.lib_deps}
# renovate: datasource=custom.pio depName=LovyanGFX packageName=lovyan03/library/LovyanGFX
variants/esp32s3/heltec_wireless_tracker_v2/variant.h
+3 -3
View File
@@ -92,9 +92,9 @@
// 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)
#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)
// 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