Add MeshCore relay_radio firmware for Heltec T114

variants/rak3401/RAK3401Board.cpp

@@ -0,0 +1,66 @@
+#include <Arduino.h>
+#include <Wire.h>
+
+#include "RAK3401Board.h"
+
+#ifdef NRF52_POWER_MANAGEMENT
+// Static configuration for power management
+// Values set in variant.h defines
+const PowerMgtConfig power_config = {
+  .lpcomp_ain_channel = PWRMGT_LPCOMP_AIN,
+  .lpcomp_refsel = PWRMGT_LPCOMP_REFSEL,
+  .voltage_bootlock = PWRMGT_VOLTAGE_BOOTLOCK
+};
+
+void RAK3401Board::initiateShutdown(uint8_t reason) {
+  // Disable SKY66122 FEM (CSD+CPS LOW = shutdown, <1 uA)
+  digitalWrite(SX126X_POWER_EN, LOW);
+
+  // Disable 3V3 switched peripherals and 5V boost
+  digitalWrite(PIN_3V3_EN, LOW);
+
+  if (reason == SHUTDOWN_REASON_LOW_VOLTAGE ||
+      reason == SHUTDOWN_REASON_BOOT_PROTECT) {
+    configureVoltageWake(power_config.lpcomp_ain_channel, power_config.lpcomp_refsel);
+  }
+
+  enterSystemOff(reason);
+}
+#endif
+
+void RAK3401Board::begin() {
+  NRF52BoardDCDC::begin();
+  pinMode(PIN_VBAT_READ, INPUT);
+#ifdef PIN_USER_BTN
+  pinMode(PIN_USER_BTN, INPUT_PULLUP);
+#endif
+
+#ifdef PIN_USER_BTN_ANA
+  pinMode(PIN_USER_BTN_ANA, INPUT_PULLUP);
+#endif
+
+#if defined(PIN_BOARD_SDA) && defined(PIN_BOARD_SCL)
+  Wire.setPins(PIN_BOARD_SDA, PIN_BOARD_SCL);
+#endif
+
+  Wire.begin();
+
+  // PIN_3V3_EN (WB_IO2, P0.34) controls the 3V3_S switched peripheral rail
+  // AND the 5V boost regulator (U5) on the RAK13302 that powers the SKY66122 PA.
+  // Must stay HIGH during radio operation — do not toggle for power saving.
+  pinMode(PIN_3V3_EN, OUTPUT);
+  digitalWrite(PIN_3V3_EN, HIGH);
+
+  // Enable SKY66122-11 FEM on the RAK13302 module.
+  // CSD and CPS are tied together on the RAK13302 PCB, routed to IO3 (P0.21).
+  // HIGH = FEM active (LNA for RX, PA path available for TX).
+  // TX/RX switching (CTX) is handled by SX1262 DIO2 via SetDIO2AsRfSwitchCtrl.
+  pinMode(SX126X_POWER_EN, OUTPUT);
+#ifdef NRF52_POWER_MANAGEMENT
+  // Boot voltage protection check (may not return if voltage too low)
+  // We need to call this after we configure SX126X_POWER_EN as output but before we pull high
+  checkBootVoltage(&power_config);
+#endif
+  digitalWrite(SX126X_POWER_EN, HIGH);
+  delay(1);  // SKY66122 turn-on settling time (tON = 3us typ)
+}