From b25db1f42c95f7b578fbe526c8c464e3bf2d5599 Mon Sep 17 00:00:00 2001
From: Andrik45719 <andrik.kiev.ua@gmail.com>
Date: Thu, 6 Mar 2025 10:44:53 +0200
Subject: [PATCH] E22-400M SX126X_DIO3_TCXO_VOLTAGE fix (#6232)

Added TCXO voltage setting for SX1268 based module to fix error:
Calibration failed, device errors: 0x20
SX126x init result -707
---
 src/main.cpp | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/src/main.cpp b/src/main.cpp
index a82fde4be..e5e1a2537 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1017,6 +1017,22 @@ void setup()
 #endif
 
 #if defined(USE_SX1268)
+#if defined(SX126X_DIO3_TCXO_VOLTAGE) && defined(TCXO_OPTIONAL)
+    if ((!rIf) && (config.lora.region != meshtastic_Config_LoRaConfig_RegionCode_LORA_24)) {
+        // try using the specified TCXO voltage
+        auto *sxIf = new SX1268Interface(RadioLibHAL, SX126X_CS, SX126X_DIO1, SX126X_RESET, SX126X_BUSY);
+        sxIf->setTCXOVoltage(SX126X_DIO3_TCXO_VOLTAGE);
+        if (!sxIf->init()) {
+            LOG_WARN("No SX1268 radio with TCXO, Vref %fV", SX126X_DIO3_TCXO_VOLTAGE);
+            delete sxIf;
+            rIf = NULL;
+        } else {
+            LOG_INFO("SX1268 init success, TCXO, Vref %fV", SX126X_DIO3_TCXO_VOLTAGE);
+            rIf = sxIf;
+            radioType = SX1268_RADIO;
+        }
+    }
+#endif
     if ((!rIf) && (config.lora.region != meshtastic_Config_LoRaConfig_RegionCode_LORA_24)) {
         rIf = new SX1268Interface(RadioLibHAL, SX126X_CS, SX126X_DIO1, SX126X_RESET, SX126X_BUSY);
         if (!rIf->init()) {
@@ -1276,4 +1292,4 @@ void loop()
     }
 }
 
-#endif
\ No newline at end of file
+#endif