Modified text location, add a note graph in metronome task
Modified text location
Modified display method
Merge branch 'UI' of https://github.com/rtenv-plus-stm32f4/final-project into metronome
Save the semaphore which blocked the task and create the unlock mechanism
Modify the rule of semaphore operation
Set the semaphore_t typedef to be unsigned
Merge branch 'semaphore' of https://github.com/rtenv-plus-stm32f4/rtenv-plus-stm32f4 into metronome