训练项目五：定时器.c

长沙理工自己的实验程序

/****************************************************************************
** File Name:          定时器
** Createed By:        Wangchangsong
** Create Date:        07/26/2008
** Version:            1.0
** Descriptions:       led display
**
**---------------------------------------------------------------------------
** Modified By:
** Modified Date:
** Version:
** Descriptions:
**
****************************************************************************/

#include <iom128v.h>
#include <macros.h>

unsigned int count = 0;
static unsigned char led_coder[] = {0xfe,0xfd,0xfc,0xfb,0xfa,0xf9,0xf8,0xf7,0xf6,0xf5,
0xf4,0xf3,0xf2,0xf1,0xf0,0xef,0xee,0xed,0xec,0xeb,0xea,0xe9,0xe8,0xe7,0xe6,0xe5,0xe4,
0xe3,0xe2,0xe1,0xe0,0xdf,0xde,0xdd,0xdc,0xdb,0xda,0xd9,0xd8,0xd7,0xd6,0xd5,0xd4,0xd3,
0xd2,0xd1,0xd0,0xcf,0xce,0xcd,0xcc,0xcb,0xca,0xc9,0xc8,0xc7,0xc6,0xc5,0xc4};

/****************************************************************************
** Function Name:      init      
** Descriptions:       initialization
** Input Parameters:   void
** Output parameters:  void
** Returned Value:     void
**---------------------------------------------------------------------------
****************************************************************************/
   
void init()                               /* 初始化                          */
{       SREG   = 0x80;                    /* 状态寄存器，全局中断允许        */ 
        DDRB   = 0xFF;                    /* PB口作为输出口                  */
       	TCCR1A = 0;                       /* 16位定时器/计数器控制寄存器A,
		                                     引脚为通用I/O口                 */
        TCNT1H = 0xff;                    /* 16位定时器/计数器的寄存器       */
		TCNT1L = 0xff;                    /* 16位定时器/计数器的寄存器       */
        TIMSK  = 0x04;                    /* 中断屏蔽寄存器,T/C1溢出中断允许 */
        TCCR1B = 0x01;                    /* 16位定时器/计数器控制寄存器B,
                                             CLK/8(来自预分频器)             */
}

/****************************************************************************
** Function Name:      main       
** Descriptions:       
** Input Parameters:   void
** Output parameters:  void
** Returned Value:     void
**---------------------------------------------------------------------------
****************************************************************************/
										                         
void main(void)
{
    init();

    while(1)                                  /* 死循环                      */
    {
	;
	}                                       
}

#pragma interrupt_handler timer:15        
                                              /* 请查阅中断向量相关资料,
										         程序中15为中断向量号        */

/****************************************************************************
** Function Name:      timer      
** Descriptions:       
** Input Parameters:   count
** Output parameters:  void
** Returned Value:     void
**---------------------------------------------------------------------------
****************************************************************************/											 

void timer()
{ 
    PORTB = led_coder[count];  
    if(count<59)
    count+=1; 
    else count = 0;
}

/****************************************************************************
 END FILE
****************************************************************************/