fix(steami_config): Simplify calibrate_temperature for frozen drivers. (#249)

* fix(steami_config): Simplify calibrate_temperature for frozen drivers.

* fix(steami_config): Use fresh sensor instances for verification.

* fix(steami_config): Add warm-up delay for LIS2MDL temperature read.

Author: nedseb

lib/steami_config/examples/calibrate_temperature.py

@@ -1,71 +1,69 @@
 """Calibrate all temperature sensors against WSEN-HIDS reference.
 
-This example reads each sensor one at a time to stay within RAM
-limits on the STM32WB55.  Calibration offsets are stored in the
-persistent config zone and survive power cycles.
+Reads the WSEN-HIDS sensor as reference, then computes an offset for
+each other sensor.  Calibration offsets are stored in the persistent
+config zone and survive power cycles.
+
+Note: this example assumes the drivers are frozen into the firmware.
+Use ``make firmware && make deploy`` to build a firmware with the
+latest drivers before running this script.
 """
 
-import gc
-import sys
 from time import sleep_ms
 
-from daplink_flash.device import DaplinkFlash
+from daplink_flash import DaplinkFlash
+from hts221 import HTS221
+from ism330dl import ISM330DL
+from lis2mdl import LIS2MDL
 from machine import I2C
-from steami_config.device import SteamiConfig
-from wsen_hids.device import WSEN_HIDS
+from steami_config import SteamiConfig
+from wsen_hids import WSEN_HIDS
+from wsen_pads import WSEN_PADS
 
 i2c = I2C(1)
 flash = DaplinkFlash(i2c)
 config = SteamiConfig(flash)
 config.load()
 
 # Read reference temperature from WSEN-HIDS (most accurate at ambient)
-ref_temp = WSEN_HIDS(i2c).temperature()
+ref = WSEN_HIDS(i2c)
+ref_temp = ref.temperature()
 print("Reference (WSEN-HIDS): {:.2f} C".format(ref_temp))
 config.set_temperature_calibration("wsen_hids", gain=1.0, offset=0.0)
-del WSEN_HIDS
-sys.modules.pop("wsen_hids.device", None)
-gc.collect()
 
-# Calibrate each sensor one at a time to save RAM
-SENSORS = [
-    ("hts221", "hts221.device", "HTS221", "temperature"),
-    ("wsen_pads", "wsen_pads.device", "WSEN_PADS", "temperature"),
-    ("lis2mdl", "lis2mdl.device", "LIS2MDL", "temperature"),
-    ("ism330dl", "ism330dl.device", "ISM330DL", "temperature"),
+# Calibrate each sensor
+sensors = [
+    ("hts221", HTS221(i2c)),
+    ("wsen_pads", WSEN_PADS(i2c)),
+    ("lis2mdl", LIS2MDL(i2c)),
+    ("ism330dl", ISM330DL(i2c)),
 ]
 
-for config_name, module, class_name, method in SENSORS:
-    mod = __import__(module, None, None, [class_name])
-    cls = getattr(mod, class_name)
-    sensor = cls(i2c)
-    if config_name == "ism330dl":
+for name, sensor in sensors:
+    if name in ("ism330dl", "lis2mdl"):
         sleep_ms(200)
-    raw = getattr(sensor, method)()
+    raw = sensor.temperature()
     offset = ref_temp - raw
-    config.set_temperature_calibration(config_name, gain=1.0, offset=offset)
-    print("  {:10s}: {:6.2f} C -> offset {:+.2f}".format(config_name, raw, offset))
-    del sensor, cls, mod
-    sys.modules.pop(module, None)
-    gc.collect()
+    config.set_temperature_calibration(name, gain=1.0, offset=offset)
+    print("  {:10s}: {:6.2f} C -> offset {:+.2f}".format(name, raw, offset))
 
 config.save()
 print("\nCalibration saved.")
 
-# Verify by reloading
-gc.collect()
+# Verify by reloading with fresh sensor instances (simulates a reboot)
 config2 = SteamiConfig(flash)
 config2.load()
 
+verify_sensors = [
+    ("hts221", HTS221(i2c)),
+    ("wsen_pads", WSEN_PADS(i2c)),
+    ("lis2mdl", LIS2MDL(i2c)),
+    ("ism330dl", ISM330DL(i2c)),
+]
+
 print("\nVerification (after reload):")
-for config_name, module, class_name, method in SENSORS:
-    mod = __import__(module, None, None, [class_name])
-    cls = getattr(mod, class_name)
-    sensor = cls(i2c)
-    if config_name == "ism330dl":
+for name, sensor in verify_sensors:
+    if name in ("ism330dl", "lis2mdl"):
         sleep_ms(200)
     config2.apply_temperature_calibration(sensor)
-    print("  {:10s}: {:6.2f} C".format(config_name, getattr(sensor, method)()))
-    del sensor, cls, mod
-    sys.modules.pop(module, None)
-    gc.collect()
+    print("  {:10s}: {:6.2f} C".format(name, sensor.temperature()))