timer.h

在基于avr内核的单片机上实现MP3播放器的功能

#define  stop         0
#define  ck           1  
#define  ck_8         2
#define  ck_64        3
#define  ck_256       4
#define  ck_1024      5
#define  cnt_down     6
#define  cnt_up       7


//=====================
#define KernelRootTimerOff()  TCCR0=stop;
#define KernelRootTimerOn()  TCCR0=ck_256;
//easy but it is urgl
void init_t0(void)
{
TCCR0=ck_256;
TIMSK|=0x01;//SREG|=0x80;
TCNT0=39;//5ms
}