freescale

来自「Freescale 系列单片机常用模块与综合系统设计」· 代码 · 共 17 行

extern unsigned int  beep_delay;          //C4(发音时间)
extern unsigned char beep_cnt;            //C4(蜂鸣控制)
extern unsigned char interrupt_cnt;       //中断次数计数

extern struct {
unsigned bit0:1;
unsigned bit1:1;
unsigned bit2:1;                   //1表示有蜂鸣，0表示无蜂鸣
unsigned;
unsigned;
unsigned;
unsigned;
unsigned; 
}time_f1;

//在此设定音长与间隔值
extern const unsigned int beep_table[4];