keyboard demo on stm32f103
--A simple demonstration project for stm32f103 "blue pill" evaluation board and 7-pin 12-key keyboard. FreeRTOS is used.
--MCU outputs a key(s) pressed distinguishing a hit events in 2 groups: short and long(more than one second) pressed keys.
--Led blinks in a separate thread with 1 second frequency.
--Works only under debugger with stLink connected due a semihosting usage.