play keil uvision cracker music in stm32f103 by using buzzers
GPIOA_pin_1: OD output channel 0
GPIOA_pin_2: OD output channel 1
GPIOA_pin_3: OD output channel 2
GPIOA_pin_4: OD output channel 3
GPIOA_pin_5: OD output sample rate led
GPIOA_pin_6: OD output tracker tick led