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fix: backport SX1262 PHY optimisations for RAK4631 from Meshtastic #91

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fix: backport SX1262 PHY optimisations for RAK4631 from Meshtastic #91

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4 changes: 4 additions & 0 deletions Boards.h
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Original file line number Diff line number Diff line change
Expand Up @@ -831,6 +831,8 @@
#define EEPROM_OFFSET EEPROM_SIZE-EEPROM_RESERVED
#define BLE_MANUFACTURER "RAK Wireless"
#define BLE_MODEL "RAK4640"

#define OCP_TUNED 0x38 // 140mA limit for SX1262 at 22dBm

const int pin_btn_usr1 = 9;

Expand Down Expand Up @@ -869,6 +871,8 @@
#define EEPROM_OFFSET EEPROM_SIZE-EEPROM_RESERVED
#define BLE_MANUFACTURER "RAK Wireless"
#define BLE_MODEL "RAK3401"

#define OCP_TUNED 0x38 // 140mA limit for SX1262 at 22dBm

// RAK13302 SKY66122-11 FEM: +8 dBm PA gain (constant per datasheet),
// 30 dBm (1 W) max output. Gain values from Meshtastic config.
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7 changes: 4 additions & 3 deletions sx126x.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -474,6 +474,7 @@ int sx126x::begin(uint32_t frequency) {
setTxPower(2);
enableCrc();
writeRegister(REG_LNA_6X, 0x96); // Set LNA boost
writeRegister(0x0902, 0x00); // RTC STOP (Semtech Errata 15.3)
uint8_t basebuf[2] = {0}; // Set base addresses
executeOpcode(OP_BUFFER_BASE_ADDR_6X, basebuf, 2);

Expand Down Expand Up @@ -823,10 +824,10 @@ void sx126x::enableTCXO() {
if (_tcxoVoltageOverride != 0xFF) {
mode = _tcxoVoltageOverride;
} else {
#if BOARD_MODEL == BOARD_RAK4631 || BOARD_MODEL == BOARD_HELTEC32_V3 || BOARD_MODEL == BOARD_XIAO_S3
#if BOARD_MODEL == BOARD_HELTEC32_V3 || BOARD_MODEL == BOARD_XIAO_S3
mode = MODE_TCXO_3_3V_6X;
#elif BOARD_MODEL == BOARD_RAK3401
// RAK13302 specifies DIO3 TCXO at 1.8V (SX126X_DIO3_TCXO_VOLTAGE 1.8)
#elif BOARD_MODEL == BOARD_RAK4631 || BOARD_MODEL == BOARD_RAK3401
// RAK4631 and RAK13302 specify DIO3 TCXO at 1.8V
mode = MODE_TCXO_1_8V_6X;
#elif BOARD_MODEL == BOARD_TBEAM
mode = MODE_TCXO_1_8V_6X;
Expand Down