From b6e188f9e90b99c4f13f8d0c7e985991d16a7d64 Mon Sep 17 00:00:00 2001
From: Benjamin Braatz <bb@bbraatz.eu>
Date: Tue, 29 Mar 2022 06:25:15 +0200
Subject: [PATCH] Catch pigpio.error.

---
 controlpi_plugins/pcf8574.py | 38 +++++++++++++++++++++++++++++-------
 1 file changed, 31 insertions(+), 7 deletions(-)

diff --git a/controlpi_plugins/pcf8574.py b/controlpi_plugins/pcf8574.py
index d981440..257d92a 100644
--- a/controlpi_plugins/pcf8574.py
+++ b/controlpi_plugins/pcf8574.py
@@ -22,8 +22,16 @@ class OutputCard(BasePlugin):
     def process_conf(self) -> None:
         """Open I2C device, read initial state and register bus clients."""
         pi = _get_pigpio_pi()
-        self._handle = pi.i2c_open(1, self.conf['address'])
-        byte = pi.i2c_read_byte(self._handle)
+        try:
+            self._handle = pi.i2c_open(1, self.conf['address'])
+        except pigpio.error as e:
+            print(e)
+            return
+        try:
+            byte = pi.i2c_read_byte(self._handle)
+        except pigpio.error as e:
+            print(e)
+            byte = 0
         self._pins2states: Dict[int, bool] = {}
         self._pins2clients: Dict[int, List[str]] = {}
         for pin in range(0, 8):
@@ -75,8 +83,12 @@ class OutputCard(BasePlugin):
                 byte |= int(not self._pins2states[pin]) << pin
         # Write and immediately read back status byte:
         pi = _get_pigpio_pi()
-        pi.i2c_write_byte(self._handle, byte)
-        byte = pi.i2c_read_byte(self._handle)
+        try:
+            pi.i2c_write_byte(self._handle, byte)
+            byte = pi.i2c_read_byte(self._handle)
+        except pigpio.error as e:
+            print(e)
+            return
         # Send changed events for all changed clients:
         for pin in range(0, 8):
             new_state = not bool(byte & (1 << pin))
@@ -112,8 +124,16 @@ class InputCard(BasePlugin):
     def process_conf(self) -> None:
         """Open I2C device, read initial state and register bus clients."""
         pi = _get_pigpio_pi()
-        self._handle = pi.i2c_open(1, self.conf['address'])
-        byte = pi.i2c_read_byte(self._handle)
+        try:
+            self._handle = pi.i2c_open(1, self.conf['address'])
+        except pigpio.error as e:
+            print(e)
+            return
+        try:
+            byte = pi.i2c_read_byte(self._handle)
+        except pigpio.error as e:
+            print(e)
+            byte = 0
         self._pins2states: Dict[int, bool] = {}
         self._pins2clients: Dict[int, List[str]] = {}
         for pin in range(0, 8):
@@ -154,7 +174,11 @@ class InputCard(BasePlugin):
     def _read(self) -> None:
         # Read status byte:
         pi = _get_pigpio_pi()
-        byte = pi.i2c_read_byte(self._handle)
+        try:
+            byte = pi.i2c_read_byte(self._handle)
+        except pigpio.error as e:
+            print(e)
+            return
         # Send changed events for all changed clients:
         for pin in range(0, 8):
             new_state = not bool(byte & (1 << pin))
-- 
2.34.1