请教这个单片机程序是什么意思，一个函数不懂

void Keycheck()
{
uchar i;
uchar j;
uchar k=0;

start:
while(start()==0);

EA=1;
dcs=0;
res[i]=0;

for(keynumber=0;keynumber<6;keynumber++)
{
while(KeyNum!=Key[keynumber])
{
  CoreExplain();
 
if(start()==0) goto exit;
  }
  if(start()==0) goto exit;
}
res[i]=1;
dcs=1;

exit:
EA=0;
dcs=1;

if(i==7)
k=1;
 
  if(k==1)
  {
  dcs=1;
 
if(res[j]==1)
  reslut=0;
else
reslut=1;

j++;
}
  i++;

  if(i==8)
  i=0;
 
  if(j==8)
    j=0;

while(start()==1);
goto start;
}