This should prevent stlink-output in the gdb shell
3 new spi bare_metal example projects

well it isn't actually spi, rather shiftregisters, but it's using spi hardware...
highlevel spi interface
Ability to bypass the SPI2_IRQHandler used by the highlevel SPI interface.

See 'USAGE: own SPI code' section in libsystem/inc/Spi.h
Add a useful GDB macro in tools/armv7m-macros.gdb.txt for figuring stuff out when hanging in some default irq handler or something like that
Add STM32F4-Discovery pinout execel sheet
Add a few peripheral datasheets
Merge branch 'master' of github.com:cccc/U23_2013_examples
I2C sample added
SPI: Fix syntax for function pointers
Add register read with repeated start to i2c example
Add angle of magnetometer to i2c example
Merge https://github.com/cccc/U23_2013_examples