Update

P1AM/P1AM.py

@@ -5,9 +5,7 @@
 `P1AM`
 ================================================================================
 
-Library to interface with P1000 modules using a P1AM-200.
-
-* Author(s): Adam Cummick, Tristan Warder, Michael Scott
+Library to interface with Productivity1000 modules.
 """
 
 import time
@@ -23,7 +21,7 @@
 __repo__ = "https://github.com/facts-engineering/CircuitPython_P1AM.git"
 
 def change_bit(original, bit, state):
-    """Change value of sepcific bit position"""
+    """Change value of specific bit position"""
     if state:
         return original | (1 << bit)
 
@@ -86,19 +84,24 @@ def read_block(length: int, offset: int, block_type: int):
         _p1.write(msg)
     if _spi_timeout():
         with BC_SPI as _p1:
+            time.sleep(0.00001)
             _p1.readinto(data_buf, start=0, end=length)
         _data_sync()
         data = int.from_bytes(data_buf[0:length], byte_order)
         return data
 
-    return False  # no respsonse
+    raise RuntimeError(
+        "Check External Supply Connection\nNo Base Controller Activity"
+    )
 
 
 def _data_sync(timeout=0.2):
-    """Wait for Base Contorller to update data"""
+    """Wait for Base Controller to update data"""
     start = time.monotonic()
+    power_lost = 0
     while not ACK.value:
         if time.monotonic() - start > timeout:
+            power_lost += 1
             break
 
     start = time.monotonic()
@@ -109,8 +112,14 @@ def _data_sync(timeout=0.2):
     start = time.monotonic()
     while not ACK.value:
         if time.monotonic() - start > timeout:
+            power_lost += 1
             break
 
+    if power_lost == 2:
+        raise RuntimeError(
+            "Check External Supply Connection\nNo Base Controller Activity"
+        )
+
 
 def _spi_timeout(timeout=0.200):
     """Wait for Base Controller to be ready for next transaction"""
@@ -1003,7 +1012,7 @@ def init(self):  # pylint: disable=too-many-locals, too-many-statements
 
         if _spi_timeout(5) is False:
             raise RuntimeError(
-                "Check External Supply Connection\n" "No Base Controller Activity"
+                "Check External Supply Connection\nNo Base Controller Activity"
             )
 
         while (slots == 0 or slots > 15) and retry < 5:

examples/discrete_output.py

@@ -30,7 +30,7 @@
 base = P1AM.Base() # Intializes base. Returns the base object.
 module = base[1] # module object for slot 1
 output = module[2] # 2nd channel object for our output module.
-# output = module.outputs[2] # on combos select inputs with module.outputs
+# output = module.outputs[2] # on combos select outputs with module.outputs
 
 while True:
     output.value = True

examples/power_cycle.py

@@ -0,0 +1,48 @@
+"""
+	Example: Power Cycle
+
+    
+	This example shows how to re-init the base after power has been cycled.
+    
+    When powering your device with both USB and external power, this example can
+    be used to catch and handle errors produced by a temporary loss of external 24V.
+
+	This example uses a discrete output module, but can be adapted to other modules.
+	 _____  _____
+	|  P  ||  S  |
+	|  1  ||  L  |
+	|  A  ||  O  |
+	|  M  ||  T  |
+	|  -  ||     |
+	|  2  ||  0  |
+	|  0  ||  1  |
+	|  0  ||     |
+	 ¯¯¯¯¯  ¯¯¯¯¯
+ 	Written by FACTS Engineering
+ 	Copyright (c) 2023 FACTS Engineering, LLC
+ 	Licensed under the MIT license.
+"""
+
+import time
+import P1AM
+
+base = P1AM.Base() # Intializes base. Returns the base object.
+module = base[1] # module object for slot 1
+output = module[2] # 2nd channel object for our output module.
+# output = module.outputs[2] # on combos select outputs with module.outputs
+
+while True:
+    try:
+        # removing external 24V here will raise a RuntimeError
+        output.value = True
+        time.sleep(1)
+        output.value = False
+        time.sleep(1)
+    except RuntimeError:
+        while True:
+        	# loop until base is re-initialized
+            try:
+                base.init()	# must be called if external 24V is interrupted
+                break
+            except RuntimeError:
+                pass

pyproject.toml

@@ -13,7 +13,7 @@ readme = "README.md"
 authors = [
     {name = "Adam Cummick", email = "adamc@facts-eng.com"}
 ]
-urls = {Homepage = "https://github.com/facts-engineering/CircuitPython_P1AM.git"}
+urls = {Homepage = "https://github.com/facts-engineering/CircuitPython_P1AM"}
 keywords = [
     "adafruit",
     "circuitpython",