Merge pull request #467 from kdijkstra/bug3307

bugfix for bug3307

fileio/private/read_trigger.m

@@ -89,6 +89,12 @@
 end
 
 if fixbiosemi
+  if ft_platform_supports('int32_logical_operations')
+    % convert to 32-bit integer representation and only preserve the lowest 24 bits
+    dat = bitand(int32(dat), 2^24-1);
+    % apparently the 24 bits are still shifted by one byte
+    dat = bitshift(dat,-8);
+  else
   % find indices of negative numbers
   signbit = find(dat < 0);
   % change type to double (otherwise bitcmp will fail)
@@ -101,6 +107,7 @@
   dat(signbit) = dat(signbit)+(2^(24-1));
   % typecast the data to ensure that the status channel is represented in 32 bits
   dat = uint32(dat);
+  end
 
   byte1 = 2^8  - 1;
   byte2 = 2^16 - 1 - byte1;