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Added Heltec V4.3 support/FEM autodetection

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This commit is contained in:
Nickie Deuxyeux
2026-04-08 22:00:43 +03:00
parent 2997cc34dd
commit 4900bd4d1e
9 changed files with 130 additions and 235 deletions
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72
sx126x.cpp
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@@ -363,7 +363,9 @@ int sx126x::begin(long frequency) {
setFrequency(frequency);
setTxPower(2);
enableCrc();
writeRegister(REG_LNA_6X, 0x96); // Set LNA boost
writeRegister(REG_LNA_6X, 0x96); // Set LNA boosted gain mode
// Undocumented SX1262 register patch recommended by Heltec/Semtech for improved RX sensitivity.
writeRegister(0x08B5, readRegister(0x08B5) | 0x01);
uint8_t basebuf[2] = {0}; // Set base addresses
executeOpcode(OP_BUFFER_BASE_ADDR_6X, basebuf, 2);
@@ -371,31 +373,29 @@ int sx126x::begin(long frequency) {
setPacketParams(_preambleLength, _implicitHeaderMode, _payloadLength, _crcMode);
#if HAS_LORA_PA
#if LORA_PA_GC1109
// Enable Vfem_ctl for supply to
// PA power net.
#if LORA_PA_AUTO_DETECT
// Power up the FEM, then read GPIO LORA_PA_CSD as input.
// The V4.2 (GC1109) board pulls it LOW; V4.3 (KCT8103L) pulls it HIGH.
pinMode(LORA_PA_PWR_EN, OUTPUT);
digitalWrite(LORA_PA_PWR_EN, HIGH);
delay(1);
pinMode(LORA_PA_CSD, INPUT);
delay(1);
_kct8103l = (digitalRead(LORA_PA_CSD) == HIGH);
// Enable PA LNA and TX standby
pinMode(LORA_PA_CSD, OUTPUT);
digitalWrite(LORA_PA_CSD, HIGH);
// Keep PA CPS low until actual
// transmit. Does it save power?
// Who knows? Will have to measure.
// Note from the future: Nope.
// Power consumption is the same,
// and turning it on and off is
// not something that it likes.
// Keeping it high for now.
pinMode(LORA_PA_CPS, OUTPUT);
digitalWrite(LORA_PA_CPS, HIGH);
// On Heltec V4, the PA CTX pin
// is driven by the SX1262 DIO2
// pin directly, so we do not
// need to manually raise this.
if (_kct8103l) {
// KCT8103L (V4.3): CSD=HIGH enables chip, CTX=LOW=LNA/RX, CTX=HIGH=PA/TX
pinMode(LORA_PA_CSD, OUTPUT);
digitalWrite(LORA_PA_CSD, HIGH);
pinMode(LORA_PA_CTX, OUTPUT);
digitalWrite(LORA_PA_CTX, LOW); // LNA enabled by default
} else {
// GC1109 (V4.2): PA_EN=HIGH enables chip, CPS=HIGH=full PA mode
pinMode(LORA_PA_CSD, OUTPUT);
digitalWrite(LORA_PA_CSD, HIGH);
pinMode(LORA_PA_CPS, OUTPUT);
digitalWrite(LORA_PA_CPS, HIGH);
}
#endif
#endif
@@ -406,12 +406,12 @@ void sx126x::end() { sleep(); SPI.end(); _preinit_done = false; }
int sx126x::beginPacket(int implicitHeader) {
#if HAS_LORA_PA
#if LORA_PA_GC1109
// Enable PA CPS for transmit
// digitalWrite(LORA_PA_CPS, HIGH);
// Disabled since we're keeping it
// on permanently as long as the
// radio is powered up.
#if LORA_PA_AUTO_DETECT
if (_kct8103l) {
// CTX=HIGH: switch KCT8103L to PA/TX mode.
digitalWrite(LORA_PA_CTX, HIGH);
}
// GC1109: CPS kept HIGH permanently, no action needed.
#endif
#endif
@@ -628,14 +628,12 @@ void sx126x::onReceive(void(*callback)(int)){
void sx126x::receive(int size) {
#if HAS_LORA_PA
#if LORA_PA_GC1109
// Disable PA CPS for receive
// digitalWrite(LORA_PA_CPS, LOW);
// That turned out to be a bad idea.
// The LNA goes wonky if it's toggled
// on and off too quickly. We'll keep
// it on permanently, as long as the
// radio is powered up.
#if LORA_PA_AUTO_DETECT
if (_kct8103l) {
// CTX=LOW: switch KCT8103L to LNA/RX mode.
digitalWrite(LORA_PA_CTX, LOW);
}
// GC1109: CPS kept HIGH permanently, no action needed.
#endif
#endif