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Improve Heltec v4 RX reception with undocumented register patch #1398

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Improve Heltec v4 RX reception with undocumented register patch #1398

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8 changes: 8 additions & 0 deletions src/helpers/radiolib/CustomSX1262.h
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Original file line number Diff line number Diff line change
Expand Up @@ -76,6 +76,14 @@ class CustomSX1262 : public SX1262 {
setRfSwitchPins(SX126X_RXEN, SX126X_TXEN);
#endif

// for improved RX with Heltec v4
#ifdef SX126X_REGISTER_PATCH
uint8_t r_data = 0;
readRegister(0x8B5, &r_data, 1);
r_data |= 0x01;
writeRegister(0x8B5, &r_data, 1);
#endif

return true; // success
}

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11 changes: 6 additions & 5 deletions variants/heltec_v4/platformio.ini
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Expand Up @@ -17,20 +17,21 @@ build_flags =
-D P_LORA_SCLK=9
-D P_LORA_MISO=11
-D P_LORA_MOSI=10
-D P_LORA_PA_POWER=7 ;power en
-D P_LORA_PA_EN=2
-D P_LORA_PA_TX_EN=46 ;enable tx
-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 PIN_BOARD_SDA=17
-D PIN_BOARD_SCL=18
-D PIN_USER_BTN=0
-D PIN_VEXT_EN=36
-D PIN_VEXT_EN_ACTIVE=HIGH
-D LORA_TX_POWER=10 ;If it is configured as 10 here, the final output will be 22 dbm.
-D MAX_LORA_TX_POWER=22 ; Max SX1262 output
-D SX126X_DIO2_AS_RF_SWITCH=true
-D SX126X_REGISTER_PATCH=1 ; Patch register 0x8B5 for improved RX
-D SX126X_DIO2_AS_RF_SWITCH=true ; GC1109 CTX is controlled by SX1262 DIO2
-D SX126X_DIO3_TCXO_VOLTAGE=1.8
-D SX126X_CURRENT_LIMIT=140
-D SX126X_RX_BOOSTED_GAIN=1
; -D SX126X_RX_BOOSTED_GAIN=1 ; Turned off for improved RX
-D PIN_GPS_RX=38
-D PIN_GPS_TX=39
-D PIN_GPS_RESET=42
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