Add MeshCore relay_radio firmware for Heltec T114

variants/xiao_nrf52/XiaoNrf52Board.cpp

@@ -0,0 +1,74 @@
+#ifdef XIAO_NRF52
+
+#include <Arduino.h>
+#include <Wire.h>
+
+#include "XiaoNrf52Board.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 XiaoNrf52Board::initiateShutdown(uint8_t reason) {
+  bool enable_lpcomp = (reason == SHUTDOWN_REASON_LOW_VOLTAGE ||
+                        reason == SHUTDOWN_REASON_BOOT_PROTECT);
+
+  pinMode(VBAT_ENABLE, OUTPUT);
+  digitalWrite(VBAT_ENABLE, enable_lpcomp ? LOW : HIGH);
+
+  if (enable_lpcomp) {
+    configureVoltageWake(power_config.lpcomp_ain_channel, power_config.lpcomp_refsel);
+  }
+
+  enterSystemOff(reason);
+}
+#endif // NRF52_POWER_MANAGEMENT
+
+void XiaoNrf52Board::begin() {
+  NRF52BoardDCDC::begin();
+
+  // Configure battery voltage ADC
+  pinMode(PIN_VBAT, INPUT);
+  pinMode(VBAT_ENABLE, OUTPUT);
+  digitalWrite(VBAT_ENABLE, LOW);  // Enable VBAT divider for reading
+  analogReadResolution(12);
+  analogReference(AR_INTERNAL_3_0);
+  delay(50);  // Allow ADC to settle
+
+#ifdef PIN_USER_BTN
+  pinMode(PIN_USER_BTN, INPUT_PULLUP);
+#endif
+
+#if defined(PIN_WIRE_SDA) && defined(PIN_WIRE_SCL)
+  Wire.setPins(PIN_WIRE_SDA, PIN_WIRE_SCL);
+#endif
+
+  Wire.begin();
+
+#ifdef P_LORA_TX_LED
+  pinMode(P_LORA_TX_LED, OUTPUT);
+  digitalWrite(P_LORA_TX_LED, HIGH);
+#endif
+
+#ifdef NRF52_POWER_MANAGEMENT
+  // Boot voltage protection check (may not return if voltage too low)
+  checkBootVoltage(&power_config);
+#endif
+
+  delay(10);  // Give sx1262 some time to power up
+}
+
+uint16_t XiaoNrf52Board::getBattMilliVolts() {
+  // https://wiki.seeedstudio.com/XIAO_BLE#q3-what-are-the-considerations-when-using-xiao-nrf52840-sense-for-battery-charging
+  // VBAT_ENABLE must be LOW to read battery voltage
+  digitalWrite(VBAT_ENABLE, LOW);
+  int adcvalue = analogRead(PIN_VBAT);
+  return (adcvalue * ADC_MULTIPLIER * AREF_VOLTAGE) / 4.096;
+}
+
+#endif