Reorganize error handling for cxfer

src/dpdumper/hl_board_utilities.py

@@ -86,13 +86,14 @@ def read_ic(cls, ser: serial.Serial, cmd_class: type[HardwareBoardCommands], ic:
 
             data_normal = cmd_class.cxfer_read(ic.address, ic.data, hi_pins, upd_callback, ser)
 
+            if not data_normal:
+                raise IOError('Unable to read data from IC')
+
             # If we need to check for Hi-Z, we need to forcefully set data pins to high and then redo the dump
             if check_hiz:
                 print('Performing a second pass to detect Hi-Z pins!')
                 hi_pins = list(set(hi_pins + ic.data))
                 data_invert = cmd_class.cxfer_read(ic.address, ic.data, hi_pins, upd_callback, ser)
-        except Exception as exc:
-            _LOGGER.critical(exc)
         finally:
             ser.reset_input_buffer()
             ser.reset_output_buffer()
@@ -108,12 +109,10 @@ def read_ic(cls, ser: serial.Serial, cmd_class: type[HardwareBoardCommands], ic:
                 dni = int.from_bytes(bytes(dn))
                 dii = int.from_bytes(bytes(di))
                 read_data.append(DataElement(data=dni, z_mask=dni^dii))
-        elif data_normal:
+        else:
             for dn in DPLibUtils.iter_grouper(data_normal, data_width, 0):
                 dni = int.from_bytes(bytes(dn))
                 read_data.append(DataElement(data=dni))
-        else:
-            raise IOError('Data array is not available!')
 
         return read_data[:addr_combs]