Merge pull request #22 from tardani95/software_SPL_C system core clock fixed - imu stable with polling

all peripheral enabled - button2 messing with button1

Merge branch 'sw_imu_second_try' into software_SPL_C

system core clock fixed - i2c working perfectly

clock source set to external 8mhz crystal

.cproject file restored

imu test initial commit

uart communication pc targets added

added ack system to ble communication dbg_cat changed to verbosity

systick frequency corrected