ARM_4412_蜂鸣器

#define GPD0CON   (volatile unsigned int *)0x114000a0
#define TCFG0  (volatile unsigned int *)0x139D0000
#define TCFG1  (volatile unsigned int *)0x139D0004


#define TCNTB0  (volatile unsigned int *)0x139D000c
#define TCMPB0  (volatile unsigned int *)0x139D0010
#define TCON  (volatile unsigned int *)0x139D0008




void buzzer_init(void)
{
*GPD0CON = *GPD0CON & ~(0xf) | 0x2; //复用功能 设置为TOUT0
//Timer Input Clock Frequency = PCLK/({prescaler value + 1})/{divider value}
*TCFG0 = 249; //一级分频
*TCFG1 = 3;   //二级分频


*TCNTB0 = 500;
*TCMPB0 = 250;


*TCON = 0xa;  //auto reload ; update TCNTB0 and TCMPB0 ; stop timer


*TCON = 0x9;  //auto reload  ; start timer




}
int main(void)
{


buzzer_init();


}