> GCC definitely works. Here is a link to a Windows package: >=20 > http://www.microbuilder.eu/projects/LPC1343ReferenceDesign/LPC1343Toolcha= in.aspx Of course, this is an NXP package, not an ST package. Since these chips have extensive and complex peripherals, often defined in = "C" terms, trying to program one without having manufacturer-provided .h fi= les containing the appropriate register and bit definitions would probably = be =85 frustrating. Also note that the package is relatively old (2010) BillW --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .