add heltec v4.3 board

variants/heltec_v4/HeltecV4Board.cpp

@@ -7,24 +7,7 @@ void HeltecV4Board::begin() {
     pinMode(PIN_ADC_CTRL, OUTPUT);
     digitalWrite(PIN_ADC_CTRL, LOW); // Initially inactive
 
-    // Set up digital GPIO registers before releasing RTC hold. The hold latches
-    // the pad state including function select, so register writes accumulate
-    // without affecting the pad. On hold release, all changes apply atomically
-    // (IO MUX switches to digital GPIO with output already HIGH — no glitch).
-    pinMode(P_LORA_PA_POWER, OUTPUT);
-    digitalWrite(P_LORA_PA_POWER,HIGH);
-    rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_POWER);
-
-    pinMode(P_LORA_PA_EN, OUTPUT);
-    digitalWrite(P_LORA_PA_EN,HIGH);
-    rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_EN);
-    pinMode(P_LORA_PA_TX_EN, OUTPUT);
-    digitalWrite(P_LORA_PA_TX_EN,LOW);
-
-    esp_reset_reason_t reason = esp_reset_reason();
-    if (reason != ESP_RST_DEEPSLEEP) {
-      delay(1);  // GC1109 startup time after cold power-on
-    }
+    loRaFEMControl.init();
 
     periph_power.begin();
     if (reason == ESP_RST_DEEPSLEEP) {
@@ -40,12 +23,12 @@ void HeltecV4Board::begin() {
 
   void HeltecV4Board::onBeforeTransmit(void) {
     digitalWrite(P_LORA_TX_LED, HIGH);   // turn TX LED on
-    digitalWrite(P_LORA_PA_TX_EN,HIGH);
+    loRaFEMControl.setTxModeEnable();
   }
 
   void HeltecV4Board::onAfterTransmit(void) {
     digitalWrite(P_LORA_TX_LED, LOW);   // turn TX LED off
-    digitalWrite(P_LORA_PA_TX_EN,LOW);
+    loRaFEMControl.setRxModeEnable();
   }
 
   void HeltecV4Board::enterDeepSleep(uint32_t secs, int pin_wake_btn) {
@@ -57,9 +40,7 @@ void HeltecV4Board::begin() {
 
     rtc_gpio_hold_en((gpio_num_t)P_LORA_NSS);
 
-    // Hold GC1109 FEM pins during sleep to keep LNA active for RX wake
-    rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_POWER);
-    rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_EN);
+    loRaFEMControl.setRxModeEnableWhenMCUSleep();//It also needs to be enabled in receive mode
 
     if (pin_wake_btn < 0) {
       esp_sleep_enable_ext1_wakeup( (1L << P_LORA_DIO_1), ESP_EXT1_WAKEUP_ANY_HIGH);  // wake up on: recv LoRa packet
@@ -95,9 +76,9 @@ void HeltecV4Board::begin() {
   }
 
   const char* HeltecV4Board::getManufacturerName() const {
-  #ifdef HELTEC_LORA_V4_TFT
-    return "Heltec V4 TFT";
-  #else
-    return "Heltec V4 OLED";
-  #endif
+#ifdef HELTEC_LORA_V4_TFT
+    return loRaFEMControl.getFEMType() == KCT8103L_PA ? "Heltec V4.3 TFT" : "Heltec V4 TFT";
+#else
+    return loRaFEMControl.getFEMType() == KCT8103L_PA ? "Heltec V4.3 OLED" : "Heltec V4 OLED";
+#endif
   }

variants/heltec_v4/HeltecV4Board.h

@@ -4,12 +4,12 @@
 #include <helpers/RefCountedDigitalPin.h>
 #include <helpers/ESP32Board.h>
 #include <driver/rtc_io.h>
-
+#include "LoRaFEMControl.h"
 class HeltecV4Board : public ESP32Board {
 
 public:
   RefCountedDigitalPin periph_power;
-
+  LoRaFEMControl loRaFEMControl;
   HeltecV4Board() : periph_power(PIN_VEXT_EN,PIN_VEXT_EN_ACTIVE) { }
 
   void begin();

variants/heltec_v4/LoRaFEMControl.cpp

@@ -0,0 +1,108 @@
+#include "LoRaFEMControl.h"
+#include <driver/rtc_io.h>
+#include <esp_sleep.h>
+#include <Arduino.h>
+
+void LoRaFEMControl::init(void)
+{
+    // Power on FEM LDO — set registers before releasing RTC hold for
+    // atomic transition (no glitch on deep sleep wake).
+    pinMode(P_LORA_PA_POWER, OUTPUT);
+    digitalWrite(P_LORA_PA_POWER, HIGH);
+    rtc_gpio_hold_dis((gpio_num_t)P_LORA_PA_POWER);
+
+    esp_reset_reason_t reason = esp_reset_reason();
+    if (reason != ESP_RST_DEEPSLEEP) {
+        delay(1);  // FEM startup time after cold power-on
+    }
+
+    // Auto-detect FEM type via shared GPIO2 default pull level.
+    // GC1109 CSD: internal pull-down → reads LOW
+    // KCT8103L CSD: internal pull-up → reads HIGH
+    rtc_gpio_hold_dis((gpio_num_t)P_LORA_KCT8103L_PA_CSD);
+    pinMode(P_LORA_KCT8103L_PA_CSD, INPUT);
+    delay(1);
+    if(digitalRead(P_LORA_KCT8103L_PA_CSD)==HIGH) {
+        // FEM is KCT8103L (V4.3)
+        fem_type= KCT8103L_PA;
+        pinMode(P_LORA_KCT8103L_PA_CSD, OUTPUT);
+        digitalWrite(P_LORA_KCT8103L_PA_CSD, HIGH);
+        rtc_gpio_hold_dis((gpio_num_t)P_LORA_KCT8103L_PA_CTX);
+        pinMode(P_LORA_KCT8103L_PA_CTX, OUTPUT);
+        digitalWrite(P_LORA_KCT8103L_PA_CTX, lna_enabled ? LOW : HIGH);
+        setLnaCanControl(true);
+    } else {
+        // FEM is GC1109 (V4.2)
+        fem_type= GC1109_PA;
+        pinMode(P_LORA_GC1109_PA_EN, OUTPUT);
+        digitalWrite(P_LORA_GC1109_PA_EN, HIGH);
+        pinMode(P_LORA_GC1109_PA_TX_EN, OUTPUT);
+        digitalWrite(P_LORA_GC1109_PA_TX_EN, LOW);
+    }
+}
+
+void LoRaFEMControl::setSleepModeEnable(void)
+{
+    if(fem_type==GC1109_PA) {
+    /*
+     * Do not switch the power on and off frequently.
+     * After turning off P_LORA_PA_EN, the power consumption has dropped to the uA level.
+     */
+    digitalWrite(P_LORA_GC1109_PA_EN, LOW);
+    digitalWrite(P_LORA_GC1109_PA_TX_EN, LOW);
+    } else if(fem_type==KCT8103L_PA) {
+        // shutdown the PA
+        digitalWrite(P_LORA_KCT8103L_PA_CSD, LOW);
+    }
+}
+
+void LoRaFEMControl::setTxModeEnable(void)
+{
+    if(fem_type==GC1109_PA) {
+        digitalWrite(P_LORA_GC1109_PA_EN, HIGH);   // CSD=1: Chip enabled
+        digitalWrite(P_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(P_LORA_KCT8103L_PA_CSD, HIGH);
+        digitalWrite(P_LORA_KCT8103L_PA_CTX, HIGH);
+    }
+}
+
+void LoRaFEMControl::setRxModeEnable(void)
+{
+    if(fem_type==GC1109_PA) {
+        digitalWrite(P_LORA_GC1109_PA_EN, HIGH);  // CSD=1: Chip enabled
+        digitalWrite(P_LORA_GC1109_PA_TX_EN, LOW); 
+    } else if(fem_type==KCT8103L_PA) {
+        digitalWrite(P_LORA_KCT8103L_PA_CSD, HIGH);
+        if(lna_enabled) {
+            digitalWrite(P_LORA_KCT8103L_PA_CTX, LOW);   // LNA on
+        } else {
+            digitalWrite(P_LORA_KCT8103L_PA_CTX, HIGH);  // LNA bypass
+        }
+    }
+}
+
+void LoRaFEMControl::setRxModeEnableWhenMCUSleep(void)
+{
+    digitalWrite(P_LORA_PA_POWER, HIGH);
+    rtc_gpio_hold_en((gpio_num_t)P_LORA_PA_POWER);
+    if(fem_type==GC1109_PA) {
+        digitalWrite(P_LORA_GC1109_PA_EN, HIGH);
+        rtc_gpio_hold_en((gpio_num_t)P_LORA_GC1109_PA_EN);
+        gpio_pulldown_en((gpio_num_t)P_LORA_GC1109_PA_TX_EN);
+    } else if(fem_type==KCT8103L_PA) {
+        digitalWrite(P_LORA_KCT8103L_PA_CSD, HIGH);
+        rtc_gpio_hold_en((gpio_num_t)P_LORA_KCT8103L_PA_CSD);
+        if(lna_enabled) {
+            digitalWrite(P_LORA_KCT8103L_PA_CTX, LOW);   // LNA on
+        } else {
+            digitalWrite(P_LORA_KCT8103L_PA_CTX, HIGH);  // LNA bypass
+        }
+        rtc_gpio_hold_en((gpio_num_t)P_LORA_KCT8103L_PA_CTX);
+    }
+}
+
+void LoRaFEMControl::setLNAEnable(bool enabled)
+{
+    lna_enabled = enabled;
+}

variants/heltec_v4/LoRaFEMControl.h

@@ -0,0 +1,29 @@
+#pragma once
+#include <stdint.h>
+
+typedef enum {
+    GC1109_PA,
+    KCT8103L_PA,
+    OTHER_FEM_TYPES
+} LoRaFEMType;
+
+class LoRaFEMControl
+{
+  public:
+    LoRaFEMControl(){ }
+    virtual ~LoRaFEMControl(){ }
+    void init(void);
+    void setSleepModeEnable(void);
+    void setTxModeEnable(void);
+    void setRxModeEnable(void);
+    void setRxModeEnableWhenMCUSleep(void);
+    void setLNAEnable(bool enabled);
+    bool isLnaCanControl(void) { return lna_can_control; }
+    void setLnaCanControl(bool can_control) { lna_can_control = can_control; }
+    LoRaFEMType getFEMType(void) const { return fem_type; }
+  private:
+    LoRaFEMType fem_type=OTHER_FEM_TYPES;
+    bool lna_enabled=true;
+    bool lna_can_control=false;
+};
+

variants/heltec_v4/platformio.ini

@@ -17,9 +17,11 @@ build_flags =
   -D P_LORA_SCLK=9
   -D P_LORA_MISO=11
   -D P_LORA_MOSI=10
-  -D P_LORA_PA_POWER=7   ; VFEM_Ctrl - Power on GC1109
-  -D P_LORA_PA_EN=2      ; PA CSD - Enable GC1109
-  -D P_LORA_PA_TX_EN=46  ; PA CPS - GC1109 TX PA full(High) / bypass(Low)
+  -D P_LORA_PA_POWER=7  ; // VFEM_Ctrl -LDO power enable
+  -D P_LORA_GC1109_PA_EN=2    ; // CSD - GC1109 chip enable (HIGH=on)
+  -D P_LORA_GC1109_PA_TX_EN=46 ;// CPS - GC1109 PA mode (HIGH=full PA, LOW=bypass)
+  -D P_LORA_KCT8103L_PA_CSD=2
+  -D P_LORA_KCT8103L_PA_CTX=5
   -D PIN_USER_BTN=0
   -D PIN_VEXT_EN=36
   -D PIN_VEXT_EN_ACTIVE=HIGH