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Handle GC1109 LNA gain variance properly

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Mark Qvist 2025-11-22 00:04:56 +01:00
parent b8ab1caf96
commit 7b0658b197
4 changed files with 36 additions and 7 deletions
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20
sx126x.cpp
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@ -356,8 +356,13 @@ int sx126x::begin(long frequency) {
// 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, LOW);
digitalWrite(LORA_PA_CPS, HIGH);
// On Heltec V4, the PA CTX pin
// is driven by the SX1262 DIO2
@ -375,7 +380,10 @@ int sx126x::beginPacket(int implicitHeader) {
#if HAS_LORA_PA
#if LORA_PA_GC1109
// Enable PA CPS for transmit
digitalWrite(LORA_PA_CPS, HIGH);
// digitalWrite(LORA_PA_CPS, HIGH);
// Disabled since we're keeping it
// on permanently as long as the
// radio is powered up.
#endif
#endif
@ -476,7 +484,6 @@ uint8_t sx126x::packetRssiRaw() {
}
int ISR_VECT sx126x::packetRssi() {
// TODO: May need more calculations here
uint8_t buf[3] = {0};
executeOpcodeRead(OP_PACKET_STATUS_6X, buf, 3);
int pkt_rssi = -buf[0] / 2;
@ -590,7 +597,12 @@ void sx126x::receive(int size) {
#if HAS_LORA_PA
#if LORA_PA_GC1109
// Disable PA CPS for receive
digitalWrite(LORA_PA_CPS, LOW);
// 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.
#endif
#endif