Restructure project

source/battery.cpp

@@ -0,0 +1,46 @@
+#include "battery.h"
+
+#ifdef FEATURE_BATTERY_MONITOR
+#include <bluefruit.h>
+
+extern BLEBas blebas;
+
+// Battery ADC is kept permanently configured at 12-bit / AR_INTERNAL_3_0 to avoid
+// the SAADC re-init cost of analogReference() changes, which blocks the CPU for
+// several ms and causes BLE connection-interval violations (visible mouse freeze).
+// PIN_VBAT_ENABLE is held LOW permanently once battery monitoring starts.
+void initBatteryADC() {
+  pinMode(PIN_VBAT_ENABLE, OUTPUT); digitalWrite(PIN_VBAT_ENABLE, LOW);
+  pinMode(PIN_VBAT_READ, INPUT);
+  analogReference(AR_INTERNAL_3_0); analogReadResolution(12);
+  // Warm up with a few reads (no delay — just discard results)
+  for (int i=0; i<8; i++) analogRead(PIN_VBAT_READ);
+}
+
+float readBatteryVoltage() {
+  // 8 quick reads, no delay() calls, no analogReference() change
+  int32_t raw=0; for (int i=0; i<8; i++) raw += analogRead(PIN_VBAT_READ); raw /= 8;
+  return (raw / 4096.0f) * 3.0f * 2.0f;
+}
+
+int batteryPercent(float v) {
+  return (int)constrain((v - BATT_EMPTY) / (BATT_FULL - BATT_EMPTY) * 100.f, 0, 100);
+}
+
+void updateBattery() {
+  float v = readBatteryVoltage(); int pct = batteryPercent(v);
+  bool chg = (digitalRead(PIN_CHG) == LOW);
+  ChargeStatus status = chg ? (pct >= 99 ? CHGSTAT_FULL : CHGSTAT_CHARGING) : CHGSTAT_DISCHARGING;
+  blebas.write(pct);
+  lastChargeStatus = status;
+  #ifdef FEATURE_TELEMETRY
+    telem.chargeStatus = (uint8_t)status;
+  #endif
+  const char* st[] = {"discharging","charging","full"};
+  Serial.print("[BATT] "); Serial.print(v,2); Serial.print("V ");
+  Serial.print(pct); Serial.print("% "); Serial.println(st[status]);
+  if (status == CHGSTAT_DISCHARGING && v < BATT_CRITICAL)
+    for (int i=0; i<6; i++) { digitalWrite(LED_RED,LOW); delay(80); digitalWrite(LED_RED,HIGH); delay(80); }
+}
+
+#endif // FEATURE_BATTERY_MONITOR