SX1262 LDO Support

- Added build flag "SX126X_USE_REGULATOR_LDO" (set to 1 to enable) to use LDO for the SX1262 radio instead of DC-DC when the DCDC pin isn't wired up (e.g. t-echo lite)
- Added additional debug mode diagnostic messages during SX1262 init to better highlight faults

Author: entr0p1

src/helpers/radiolib/CustomSX1262.h

@@ -1,6 +1,7 @@
 #pragma once
 
 #include <RadioLib.h>
+#include "MeshCore.h"
 
 #define SX126X_IRQ_HEADER_VALID                0b0000010000  //  4     4     valid LoRa header received
 #define SX126X_IRQ_PREAMBLE_DETECTED           0x04
@@ -27,6 +28,14 @@ class CustomSX1262 : public SX1262 {
       uint8_t cr = 5;
   #endif
 
+  #ifdef SX126X_USE_REGULATOR_LDO
+      constexpr bool useRegulatorLDO = SX126X_USE_REGULATOR_LDO;
+  #else
+      constexpr bool useRegulatorLDO = false;
+  #endif
+
+      MESH_DEBUG_PRINTLN("SX1262 regulator requested: %s", useRegulatorLDO ? "LDO" : "DC-DC");
+
   #if defined(P_LORA_SCLK)
     #ifdef NRF52_PLATFORM
       if (spi) { spi->setPins(P_LORA_MISO, P_LORA_SCLK, P_LORA_MOSI); spi->begin(); }
@@ -42,11 +51,12 @@ class CustomSX1262 : public SX1262 {
       if (spi) spi->begin(P_LORA_SCLK, P_LORA_MISO, P_LORA_MOSI);
     #endif
   #endif
-      int status = begin(LORA_FREQ, LORA_BW, LORA_SF, cr, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 16, tcxo);
+      int status = begin(LORA_FREQ, LORA_BW, LORA_SF, cr, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 16, tcxo, useRegulatorLDO);
       // if radio init fails with -707/-706, try again with tcxo voltage set to 0.0f
       if (status == RADIOLIB_ERR_SPI_CMD_FAILED || status == RADIOLIB_ERR_SPI_CMD_INVALID) {
+        MESH_DEBUG_PRINTLN("SX1262 init failed with error %d, retrying with TCXO at 0.0V", status);
         tcxo = 0.0f;
-        status = begin(LORA_FREQ, LORA_BW, LORA_SF, cr, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 16, tcxo);
+        status = begin(LORA_FREQ, LORA_BW, LORA_SF, cr, RADIOLIB_SX126X_SYNC_WORD_PRIVATE, LORA_TX_POWER, 16, tcxo, useRegulatorLDO);
       }
       if (status != RADIOLIB_ERR_NONE) {
         Serial.print("ERROR: radio init failed: ");
@@ -83,6 +93,8 @@ class CustomSX1262 : public SX1262 {
     writeRegister(0x8B5, &r_data, 1);
   #endif
 
+      MESH_DEBUG_PRINTLN("SX1262 status=0x%02X device_errors=0x%04X", getStatus(), getDeviceErrors());
+
       return true;  // success
     }