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Added support for Heltec v4.3 PA and LNA

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Mark Qvist 2026-04-20 17:16:39 +02:00
commit 9fd0ae33d2
3 changed files with 94 additions and 18 deletions
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62
sx126x.cpp
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@ -96,6 +96,14 @@
#define SPI spiModem
#endif
#if HAS_LORA_PA
uint8_t lora_pa_model = LORA_PA_MODEL;
#endif
#if HAS_LORA_LNA
int lora_lna_gain = LORA_LNA_GAIN;
#endif
extern SPIClass SPI;
#define MAX_PKT_LENGTH 255
@ -358,7 +366,22 @@ int sx126x::begin(long frequency) {
setPacketParams(_preambleLength, _implicitHeaderMode, _payloadLength, _crcMode);
#if HAS_LORA_PA
#if LORA_PA_GC1109
if (lora_pa_model == LORA_PA_UNKNOWN) {
#if BOARD_MODEL == BOARD_HELTEC32_V4
pinMode(LORA_PA_PWR_EN, OUTPUT);
pinMode(LORA_PA_CSD, INPUT);
digitalWrite(LORA_PA_PWR_EN, HIGH); delay(5);
if (digitalRead(LORA_PA_CSD) == HIGH) {
lora_pa_model = LORA_PA_KCT8103L;
lora_lna_gain = LORA_LNA_KCT8103L_GAIN;
} else {
lora_pa_model = LORA_PA_GC1109;
}
#endif
}
if (lora_pa_model == LORA_PA_GC1109) {
// Enable Vfem_ctl for supply to
// PA power net.
pinMode(LORA_PA_PWR_EN, OUTPUT);
@ -383,7 +406,26 @@ int sx126x::begin(long frequency) {
// is driven by the SX1262 DIO2
// pin directly, so we do not
// need to manually raise this.
#endif
} else if (lora_pa_model == LORA_PA_KCT8103L) {
// Enable Vfem_ctl for supply to
// PA power net.
pinMode(LORA_PA_PWR_EN, OUTPUT);
digitalWrite(LORA_PA_PWR_EN, HIGH);
// Enable KCT8103L chip
pinMode(LORA_PA_CSD, OUTPUT);
digitalWrite(LORA_PA_CSD, HIGH);
// Enable receive LNA
pinMode(LORA_PA_CTX, OUTPUT);
digitalWrite(LORA_PA_CTX, LOW);
// On Heltec V4.3, the PA CPS pin
// is driven by the SX1262 DIO2
// pin directly, so we do not
// need to manually raise this.
}
#endif
return 1;
@ -393,13 +435,15 @@ void sx126x::end() { sleep(); SPI.end(); _preinit_done = false; }
int sx126x::beginPacket(int implicitHeader) {
#if HAS_LORA_PA
#if LORA_PA_GC1109
if (lora_pa_model == 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.
#endif
} else if (lora_pa_model == LORA_PA_KCT8103L) {
digitalWrite(LORA_PA_CTX, HIGH);
}
#endif
standby();
@ -487,7 +531,7 @@ int ISR_VECT sx126x::currentRssi() {
executeOpcodeRead(OP_CURRENT_RSSI_6X, &byte, 1);
int rssi = -(int(byte)) / 2;
#if HAS_LORA_LNA
rssi -= LORA_LNA_GAIN;
rssi -= lora_lna_gain;
#endif
return rssi;
}
@ -503,7 +547,7 @@ int ISR_VECT sx126x::packetRssi() {
executeOpcodeRead(OP_PACKET_STATUS_6X, buf, 3);
int pkt_rssi = -buf[0] / 2;
#if HAS_LORA_LNA
pkt_rssi -= LORA_LNA_GAIN;
pkt_rssi -= lora_lna_gain;
#endif
return pkt_rssi;
}
@ -610,7 +654,7 @@ void sx126x::onReceive(void(*callback)(int)){
void sx126x::receive(int size) {
#if HAS_LORA_PA
#if LORA_PA_GC1109
if (lora_pa_model == LORA_PA_GC1109) {
// Disable PA CPS for receive
// digitalWrite(LORA_PA_CPS, LOW);
// That turned out to be a bad idea.
@ -618,7 +662,9 @@ void sx126x::receive(int size) {
// on and off too quickly. We'll keep
// it on permanently, as long as the
// radio is powered up.
#endif
} else if (lora_pa_model == LORA_PA_KCT8103L) {
digitalWrite(LORA_PA_CTX, LOW);
}
#endif
if (size > 0) {