Ignore last 2 bits of digital input, only on boards without long ints

For compatibility on boards that don't support arbitrary integers. Bit 31 and 32 are scrubbed on these boards instead of throwing OverflowError, while builds with long ints retain this extra functionality.

Author: carlfj

adafruit_seesaw/seesaw.py

@@ -214,7 +214,11 @@ def digital_read_bulk(self, pins, delay=0.008):
         """Get the values of all the pins on the 'A' port as a bitmask"""
         buf = bytearray(4)
         self.read(_GPIO_BASE, _GPIO_BULK, buf, delay=delay)
-        ret = struct.unpack(">I", buf)[0]
+        try:
+            ret = struct.unpack(">I", buf)[0]
+        except OverflowError:
+            buf[0] = buf[0] & 0x3F
+            ret = struct.unpack(">I", buf)[0]
         return ret & pins
 
     def digital_read_bulk_b(self, pins, delay=0.008):