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楼主 |
发表于 2012-6-12 11:48:25
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little_Monkey 发表于 2012-6-12 10:54
i=2或者i=4并且point_on不为0的时候,点亮小数点吧,猜的
仅仅给出这么一句程序你要别人这么回答你? ...
呵呵,其实就是马老师书上面的程序,我把它贴出来!
#include <mega16.h>
#ifndef __SLEEP_DEFINED__
#define __SLEEP_DEFINED__
.EQU __se_bit=0x40
.EQU __sm_mask=0xB0
.EQU __sm_powerdown=0x20
.EQU __sm_powersave=0x30
.EQU __sm_standby=0xA0
.EQU __sm_ext_standby=0xB0
.EQU __sm_adc_noise_red=0x10
.SET power_ctrl_reg=mcucr
#endif
#include <delay.h>
flash unsigned char led_7[10]={0x3F,0x06,0x5B,0x4F,0x66,0x6D,0x7D,0x07,0x7F,0x6F};
flash unsigned char position[6]={0xfe,0xfd,0xfb,0xf7,0xef,0xdf};
unsigned char time[3]; // 时、分、秒计数
unsigned char dis_buff[6]; // 显示缓冲区,存放要显示的6个字符的段码值
unsigned char time_counter; // 1秒计数器
bit point_on; // 秒显示标志
void display(void) // 扫描显示函数,执行时间12ms
{
unsigned char i;
for(i=0;i<=5;i++)
{
PORTA = led_7[dis_buff];
if (point_on && ( i==2 || i==4 )) PORTA |= 0x80; // (1) 其实我就想问这句话
PORTC = position;
delay_ms(2); // (2)
PORTC = 0xff; // (3)
}
}
void time_to_disbuffer(void) // 时间值送显示缓冲区函数
{
unsigned char i,j=0;
for (i=0;i<=2;i++)
{
dis_buff[j++] = time % 10;
dis_buff[j++] = time / 10;
}
}
void main(void)
{
PORTA=0x00; // PORTA初始化
DDRA=0xFF;
PORTC=0x3F; // PORTC初始化
DDRC=0x3F;
time[2] = 23; time[1] = 58; time[0] = 55; // 时间初值23:58:55
time_to_disbuffer();
while (1)
{
display(); // 显示扫描,执行时间12ms
if (++time_counter >= 40)
{
time_counter = 0; // (4)
point_on = ~point_on; // (5)
if (++time[0] >= 60)
{
time[0] = 0;
if (++time[1] >= 60)
{
time[1] = 0;
if (++time[2] >= 24) time[2] = 0;
}
}
time_to_disbuffer();
}
delay_ms(13); // 延时13ms,可进行其它处理(6) |
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