Use custom scan function to work around address range limitation

Author: sebromero

src/modulino/modulino.py

@@ -183,7 +183,7 @@ def discover(self, default_addresses: list[int]) -> int | None:
     if len(default_addresses) == 0:
       return None
 
-    devices_on_bus = self.i2c_bus.scan()
+    devices_on_bus = Modulino.scan(self.i2c_bus)
     for addr in default_addresses:
       if addr in devices_on_bus:
         return addr
@@ -207,7 +207,7 @@ def connected(self) -> bool:
     """
     if not bool(self):
       return False
-    return self.address in self.i2c_bus.scan()
+    return self.address in Modulino.scan(self.i2c_bus)
 
   @property
   def pin_strap_address(self) -> int | None:
@@ -314,6 +314,18 @@ def has_default_address(self) -> bool:
     """
     return self.address in self.default_addresses
 
+  @staticmethod
+  def scan(bus: I2C) -> list[int]:
+    addresses = bytearray() # Use 8bit data type
+    # Skip general call address (0x00)
+    for address in range(1,128):
+        try:
+            bus.writeto(address, b'')
+            addresses.append(address)
+        except OSError:
+            pass
+    return list(addresses)
+
   @staticmethod
   def available_devices(bus: I2C = None) -> list[Modulino]:
     """
@@ -327,7 +339,7 @@ def available_devices(bus: I2C = None) -> list[Modulino]:
     """
     if bus is None:
       bus = _I2CHelper.get_interface()
-    device_addresses = bus.scan()
+    device_addresses = Modulino.scan(bus)
     devices = []
     for address in device_addresses:
       if address == _BOOTLOADER_ADDRESS: