stm32 buzzer register ---

A: First buzzer registers are written and marquees and the like on a simple input-output GPIO port

1. Enable IO port

2. Initialize the IO port mode, write BEEP_Init ();

3. The IO port operation, the high and low output

II: Operation

Analysis and PB port enabled first, then initialize the IO port

BEEP.h #include
 void BEEP_Init ( void ) 
{ 
   the RCC -> APB2ENR | = . 1 << . 3 ; 
  GPIOB -> the CRL = & 0XFFFFFFFF0 ; // clear 0 
  GPIOB -> the CRL | = 0XFFFFFFFF3 ; // initialize 
  BEEP = 0 ; // Close buzzer output 
}

  BEEP = 0 ** ;? 
/ Close buzzer output

The main function

 

main()
{
    Stm32_Clock_Init(9);
    delay_Init(72);
     BEEP_Init（）；
    while(1)
     {
        BEEP=0;delay_ms(300);
        BEEP=0;delay_ms(300);
      }
}