add single r/w to circular buffer
make circular_buffer safe for irq writer, normal reader
Merge branch 'master' of telemedius.com:git-repos/stm32plus
allow fg/bg colour set from RGB components
Fonts in flash on F0, tidy up ttf locations. closes #60
remove unused
minor enum syntax change
corrected F0 i2c interrupt flag names
concurrency issue edge case
optimise the common case of a single subscriber to a signal (x2 speed increase)