iCD/libopencm3 — pull request #5 by ndreys (2012-11-22 00:45:19+00:00)
Title: My changes to libopencm3

Not sure if it should be merged or just cherry-pciked since AFAIK only three commits are useful.

The changes are the following:
- Subroutine to get USART interrupt status
- USB altsetting support code
- Exception frame helper code