Add support for NRF PPK2 power testing board.

.vscode/launch.json

@@ -172,7 +172,7 @@
       "request": "launch",
       "module": "meshtastic",
       "justMyCode": false,
-      "args": ["--power-riden", "/dev/ttyUSB0", "--port", "/dev/ttyACM0", "--noproto", "--seriallog", "stdout"]
+      "args": ["--power-ppk", "--power-voltage", "3.3", "--port", "/dev/ttyACM0", "--noproto", "--seriallog", "stdout"]
     },
     {
       "name": "meshtastic test",

meshtastic/__main__.py

@@ -21,7 +21,7 @@ from meshtastic import channel_pb2, config_pb2, portnums_pb2, remote_hardware, B
 from meshtastic.version import get_active_version
 from meshtastic.ble_interface import BLEInterface
 from meshtastic.mesh_interface import MeshInterface
-from meshtastic.powermon import RidenPowerSupply
+from meshtastic.powermon import RidenPowerSupply, PPK2PowerSupply
 from meshtastic.slog import StructuredLogger
 
 def onReceive(packet, interface):
@@ -1093,6 +1093,16 @@ def common():
             meter = None # assume no power meter
             if args.power_riden:
                 meter = RidenPowerSupply(args.power_riden)
+            elif args.power_ppk2:
+                meter = PPK2PowerSupply()
+
+            if meter and args.power_voltage:
+                v = float(args.power_voltage)
+                if v < 1.0 or v >5.0:
+                    meshtastic.util.our_exit("Voltage must be between 1.0 and 5.0")
+                logging.info(f"Setting power supply to {v} volts")
+                meter.v = v
+                meter.powerOn()
 
             StructuredLogger(client, meter)
 
@@ -1521,6 +1531,11 @@ def initParser():
         action="store_true",
     )
 
+    group.add_argument(
+        "--power-voltage",
+        help="Set the specified voltage on the power-supply. Be VERY careful, you can burn things up.",
+    )
+
     group.add_argument(
         "--power-stress",
         help="Perform power monitor stress testing, to capture a power consumption profile for the device (also requires --power-mon)",

meshtastic/powermon/__init__.py

@@ -1,3 +1,5 @@
 """Support for logging from power meters/supplies."""
 
-from .riden import *
+from .power_supply import PowerMeter, PowerSupply, PowerError
+from .riden import RidenPowerSupply
+from .ppk2 import PPK2PowerSupply

meshtastic/powermon/power_supply.py

@@ -0,0 +1,49 @@
+"""code logging power consumption of meshtastic devices."""
+
+import math
+from datetime import datetime
+
+class PowerError(Exception):
+    """An exception class for powermon errors"""
+    def __init__(self, message):
+        self.message = message
+        super().__init__(self.message)
+
+
+class PowerMeter:
+    """Abstract class for power meters."""
+
+    def __init__(self):
+        """Initialize the PowerMeter object."""
+        self.prevPowerTime = datetime.now()
+        self.prevWattHour = self._getRawWattHour()
+
+    def getWatts(self) -> float:
+        """Get the total amount of power that has been consumed since the previous call of this method"""
+        now = datetime.now()
+        nowWattHour = self._getRawWattHour()
+        watts = (
+            (nowWattHour - self.prevWattHour)
+            / (now - self.prevPowerTime).total_seconds()
+            * 3600
+        )
+        self.prevPowerTime = now
+        self.prevWattHour = nowWattHour
+        return watts
+
+    def _getRawWattHour(self) -> float:
+        """Get the current watt-hour reading (without any offset correction)."""
+        return math.nan
+
+
+
+class PowerSupply(PowerMeter):
+    """Abstract class for power supplies."""
+
+    def __init__(self):
+        """Initialize the PowerSupply object."""
+        super().__init__()
+        self.v = 3.3
+
+    def powerOn(self):
+        """Turn on the power supply (using the voltage set in self.v)."""

meshtastic/powermon/ppk2.py

@@ -0,0 +1,47 @@
+"""code logging power consumption of meshtastic devices."""
+
+import logging
+from typing import *
+
+from ppk2_api import ppk2_api
+from .power_supply import PowerSupply, PowerError
+
+
+
+class PPK2PowerSupply(PowerSupply):
+    """Interface for talking with the NRF PPK2 high-resolution micro-power supply.
+    Power Profiler Kit II is what you should google to find it for purchase.
+    """
+
+    def __init__(self, portName: Optional[str] = None):
+        """Initialize the PowerSupply object.
+
+            portName (str, optional): The port name of the power supply. Defaults to "/dev/ttyACM0".
+        """
+        if not portName:
+            devs = ppk2_api.PPK2_API.list_devices()
+            if not devs or len(devs) == 0:
+                raise PowerError("No PPK2 devices found")
+            elif len(devs) > 1:
+                raise PowerError("Multiple PPK2 devices found, please specify the portName")
+            else:
+                portName = devs[0]
+
+        self.r = r = ppk2_api.PPK2_MP(portName)  # serial port will be different for you
+        r.get_modifiers()
+
+        logging.info("Connected to PPK2 power supply")
+
+        super().__init__() # we call this late so that the port is already open and _getRawWattHour callback works
+
+    def powerOn(self):
+        """Power on the supply, with reasonable defaults for meshtastic devices."""
+        self.r.use_source_meter()  # set source meter mode
+        self.r.set_source_voltage(self.v * 1000)  # set source voltage in mV
+        self.r.toggle_DUT_power("ON")
+        self.r.start_measuring()  # start measuring
+
+
+    def _getRawWattHour(self) -> float:
+        """Get the current watt-hour reading."""
+        return 4 # FIXME

meshtastic/powermon/riden.py

@@ -1,52 +1,14 @@
 """code logging power consumption of meshtastic devices."""
 
 import logging
-import math
 from datetime import datetime
 
 from riden import Riden
-
-class PowerMeter:
-    """Abstract class for power meters."""
-
-    def __init__(self):
-        """Initialize the PowerMeter object."""
-        self.prevPowerTime = datetime.now()
-        self.prevWattHour = self._getRawWattHour()
-
-    def getWatts(self) -> float:
-        """Get the total amount of power that has been consumed since the previous call of this method"""
-        now = datetime.now()
-        nowWattHour = self._getRawWattHour()
-        watts = (
-            (nowWattHour - self.prevWattHour)
-            / (now - self.prevPowerTime).total_seconds()
-            * 3600
-        )
-        self.prevPowerTime = now
-        self.prevWattHour = nowWattHour
-        return watts
-
-    def _getRawWattHour(self) -> float:
-        """Get the current watt-hour reading (without any offset correction)."""
-        return math.nan
-
-
-
-class PowerSupply(PowerMeter):
-    """Abstract class for power supplies."""
-
-    def setMaxCurrent(self, i: float):
-        """Set the maximum current the supply will provide."""
-
-    def powerOn(self, v: float):
-        """Turn on the power supply."""
-
-
+from .power_supply import PowerSupply
 
 class RidenPowerSupply(PowerSupply):
-    """Interface for talking to programmable bench-top power supplies.
-    Currently only the Riden supplies are supported (RD6006 tested)
+    """Interface for talking to Riden programmable bench-top power supplies.
+    Only RD6006 tested but others should be similar.
     """
 
     def __init__(self, portName: str = "/dev/ttyUSB0"):
@@ -65,9 +27,9 @@ class RidenPowerSupply(PowerSupply):
         """Set the maximum current the supply will provide."""
         self.r.set_i_set(i)
 
-    def powerOn(self, v: float):
+    def powerOn(self):
         """Power on the supply, with reasonable defaults for meshtastic devices."""
-        self.r.set_v_set(v)  # my WM1110 devboard header is directly connected to the 3.3V rail
+        self.r.set_v_set(self.v)  # my WM1110 devboard header is directly connected to the 3.3V rail
         self.r.set_output(1)
 
     def _getRawWattHour(self) -> float:

poetry.lock

@@ -928,6 +928,20 @@ files = [
 dev = ["pre-commit", "tox"]
 testing = ["pytest", "pytest-benchmark"]
 
+[[package]]
+name = "ppk2-api"
+version = "0.9.2"
+description = "API for Nordic Semiconductor's Power Profiler Kit II (PPK 2)."
+optional = false
+python-versions = "*"
+files = [
+    {file = "ppk2-api-0.9.2.tar.gz", hash = "sha256:e8fb29f782ba6e5bd2e0286079163c495cfffce336f9b149430348c043b25300"},
+    {file = "ppk2_api-0.9.2-py3-none-any.whl", hash = "sha256:b7fb02156f87d8430bbce0006876d38c8309ada671fbcd15848173b431198803"},
+]
+
+[package.dependencies]
+pyserial = "*"
+
 [[package]]
 name = "protobuf"
 version = "5.27.1"
@@ -1794,4 +1808,4 @@ tunnel = []
 [metadata]
 lock-version = "2.0"
 python-versions = "^3.9,<3.13"
-content-hash = "cc81bcd3e4671bde3375f2f08334d6a3b87b38c97f2676d7266cab980082659e"
+content-hash = "7719c01f112a7864acdec0a82e7131aa33a646d84459cc0cc6db0eadf94933c7"

pyproject.toml

@@ -25,6 +25,7 @@ packaging = "^24.0"
 riden = {git = "https://github.com/geeksville/riden.git#1.2.1"}
 pandas = "^2.2.2"
 parse = "^1.20.2"
+ppk2-api = "^0.9.2"
 
 [tool.poetry.group.dev.dependencies]
 hypothesis = "^6.103.2"