Preliminary Thinknode M4 Support (#8754)

* Preliminary Thinknode M4 Support * oops * Fix RF switch TX configuration * trunk'd * GPS fix for M4 * Battery handling and LED for M4 * Trunk * Drop debug warnings * Make Red LED notification * Merge cleanup * Make white LEDs flash during charge --------- Co-authored-by: Jonathan Bennett <jbennett@incomsystems.biz>
2026-01-16 14:57:41 +00:00 · 2026-01-15 04:36:53 +01:00
parent a6a80b067f
commit 233e6acc85
14 changed files with 475 additions and 15 deletions
--- a/src/Power.cpp
+++ b/src/Power.cpp
@@ -693,6 +693,8 @@ bool Power::setup()
        found = true;
    } else if (lipoChargerInit()) {
        found = true;
+    } else if (serialBatteryInit()) {
+        found = true;
    } else if (meshSolarInit()) {
        found = true;
    } else if (analogInit()) {
@@ -1569,3 +1571,135 @@ bool Power::meshSolarInit()
    return false;
 }
 #endif
+
+#ifdef HAS_SERIAL_BATTERY_LEVEL
+#include <SoftwareSerial.h>
+
+/**
+ * SerialBatteryLevel class for pulling battery information from a secondary MCU over serial.
+ */
+class SerialBatteryLevel : public HasBatteryLevel
+{
+
+  public:
+    /**
+     * Init the I2C meshSolar battery level sensor
+     */
+    bool runOnce()
+    {
+        BatterySerial.begin(4800);
+
+        return true;
+    }
+
+    /**
+     * Battery state of charge, from 0 to 100 or -1 for unknown
+     */
+    virtual int getBatteryPercent() override { return v_percent; }
+
+    /**
+     * The raw voltage of the battery in millivolts, or NAN if unknown
+     */
+    virtual uint16_t getBattVoltage() override { return voltage * 1000; }
+
+    /**
+     * return true if there is a battery installed in this unit
+     */
+    virtual bool isBatteryConnect() override
+    {
+        // definitely need to gobble up more bytes at once
+        if (BatterySerial.available() > 5) {
+            // LOG_WARN("SerialBatteryLevel: %u bytes available", BatterySerial.available());
+            while (BatterySerial.available() > 11) {
+                BatterySerial.read(); // flush old data
+            }
+            // LOG_WARN("SerialBatteryLevel: %u bytes now available", BatterySerial.available());
+            int tries = 0;
+            while (BatterySerial.read() != 0xFE) {
+                tries++; // wait for start byte
+                if (tries > 10) {
+                    LOG_WARN("SerialBatteryLevel: no start byte found");
+                    return 1;
+                }
+            }
+
+            Data[1] = BatterySerial.read();
+            Data[2] = BatterySerial.read();
+            Data[3] = BatterySerial.read();
+            Data[4] = BatterySerial.read();
+            Data[5] = BatterySerial.read();
+            if (Data[5] != 0xFD) {
+                LOG_WARN("SerialBatteryLevel: invalid end byte %02x", Data[5]);
+                return true;
+            }
+            v_percent = Data[1];
+            voltage = Data[2] + (((float)Data[3]) / 100) + (((float)Data[4]) / 10000);
+            voltage *= 2;
+            // LOG_WARN("SerialBatteryLevel: received data %u, %f, %02x", v_percent, voltage, Data[5]);
+            return true;
+        }
+        // This function runs first, so use it to grab the latest data from the secondary MCU
+        return true;
+    }
+
+    /**
+     * return true if there is an external power source detected
+     */
+    virtual bool isVbusIn() override
+    {
+#if defined(EXT_CHRG_DETECT)
+
+        return digitalRead(EXT_CHRG_DETECT) == ext_chrg_detect_value;
+
+#endif
+        return false;
+    }
+
+    virtual bool isCharging() override
+    {
+#ifdef EXT_CHRG_DETECT
+        return digitalRead(EXT_CHRG_DETECT) == ext_chrg_detect_value;
+
+#endif
+        // by default, we check the battery voltage only
+        return isVbusIn();
+    }
+
+  private:
+    SoftwareSerial BatterySerial = SoftwareSerial(SERIAL_BATTERY_RX, SERIAL_BATTERY_TX);
+    uint8_t Data[6] = {0};
+    int v_percent = 0;
+    float voltage = 0.0;
+};
+
+SerialBatteryLevel serialBatteryLevel;
+
+/**
+ * Init the serial battery level sensor
+ */
+bool Power::serialBatteryInit()
+{
+#ifdef EXT_PWR_DETECT
+    pinMode(EXT_PWR_DETECT, INPUT);
+#endif
+#ifdef EXT_CHRG_DETECT
+    pinMode(EXT_CHRG_DETECT, ext_chrg_detect_mode);
+#endif
+
+    bool result = serialBatteryLevel.runOnce();
+    LOG_DEBUG("Power::serialBatteryInit serial battery sensor is %s", result ? "ready" : "not ready yet");
+    if (!result)
+        return false;
+    batteryLevel = &serialBatteryLevel;
+    return true;
+}
+
+#else
+/**
+ * If this device has no serial battery level sensor, don't try to use it.
+ */
+bool Power::serialBatteryInit()
+{
+    return false;
+}
+#endif