fix

Author: h-mayorquin

neo/rawio/intanrawio.py

@@ -631,6 +631,9 @@ def _decode_current_from_stim_data(self, raw_stim_data, i_start, i_stop):
         sign_bit = np.bitwise_and(np.right_shift(data, 8), 0x01)  # Shift right by 8 bits to get the sign bit
 
         # Apply sign to current values
+        # We need to cast to int16 to handle negative values correctly
+        # The max value of 8 bits is 255 so the casting is safe as there are non-negative values
+        magnitude = magnitude.astype(np.int16)
         current = np.where(sign_bit == 1, -magnitude, magnitude)
 
         # Note: If needed, other flag bits could be extracted as follows: