*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?ER?CCC51
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?SAN?CCC51
*** WARNING L16: UNCALLED SEGMENT, IGNORED FOR OVERLAY PROCESS
SEGMENT: ?PR?SI?CCC51
出现了这个警告，应该怎么修改程序？急用，求大神们帮忙！
基本功能：八个彩灯，四个按键。一个按键控制彩灯启动和停止，一个按键控制彩灯正向、反向运行，一个按键控制彩灯奇、偶数灯亮，最后一个按键包含以上所有状态。
以下是我的程序
#include<reg51.h>
#include<intrins.h>
#define unchar unsigned char
#define unit unsigned int
void delay(void);
void yi();
void er();
void san();
void si();
sbit sb1=P1^2;
sbit sb2=P1^3;
sbit sb3=P1^4;
sbit sb4=P1^5;
int n;
void delay(void)
{
unsigned int x,y;
for(x=0;x<200;x++);
for(y=0;y<250;y++);
}
void yi()
{
P0=0x7f;
delay();
P0=0xbf;
delay();
P0=0xdf;
delay();
P0=0xef;
delay();
P0=0xf7;
delay();
P0=0xfb;
delay();
P0=0xfd;
delay();
P0=0xfe;
delay();
}
void er()
{
P0=0xff;
}
void san()
{
P0=0xfe;
delay();
P0=0xfd;
delay();
P0=0xfb;
delay();
P0=0xf7;
delay();
P0=0xef;
delay();
P0=0xdf;
delay();
P0=0xbf;
delay();
P0=0x7f;
delay();
}
void si()
{
P0=0xaa;
delay();
P0=0x55;
delay();
}
void main()
{while(1)
{if(sb1==0)
yi();
}
{if(sb1==1)
er();
}
{if(sb1==0&&sb2==0)
san();
}
{if(sb1==0&&sb3==0)
si();
}
{if(sb4==0)
for(n=0;n<4;n++)
{if(n==0)
yi();
}
{if(n==1)
san();
}
{if(n==2)
si();
}
{if(n==3)
er();
}
}
}
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