这是负载平衡监控系统的程序请大神帮我看看有没有错误的地方 -

#include<STC89XC2.h>
unsigned char code SEGtable[]=
{
0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e,0x00
};

sbit sw7 = P0 ^ 7;
sbit sw6 = P0 ^ 6;
sbit sw5 = P0 ^ 5;
sbit sw4 = P0 ^ 4;
sbit sw3 = P0 ^ 3;
sbit sw2 = P0 ^ 2;
sbit sw1 = P0 ^ 1;
sbit sw0 = P0 ^ 0;
sbit FMQ = P1 ^ 7;
bit alarmflg = 0;
unsigned RxByte = 0x00;
unsigned char counter = 0;
unsigned char Scounter,Lcounter;       //分别存放自己的水位状态和远方的水位状态       و
unsigned char FMcounter = 0x02;    //报警状态参数
void DelayFM(unsigned int x)
{
   unsigned char t;
while(x--)
{
   for(t=0;t<120;t++);
}
}
//蜂鸣器驱动函数，参数为发声声调
void FM(unsigned char x)
{
   unsigned char i;
for(i=0;i<100;i++)
{
   FMQ =～FMQ;
   DelayFM(x);
}
FMQ = 0;
}

Void Delayms(unsigned int MS)    //延时 ms 函数
{
unsigned int i,j;
for(i=0;i＜MS;i++)
   for(j=0;j＜1141;j++);
}
void InitUART(void)
{
   TMOD = 0x20;       //9600b/s
   SCON = 0x50;
   TH1 = 0xFD;
   TL1 = TH1;
   PCON = 0x00;
   EA = 1;
   ES = 1;
   TR1 = 1;
}

void Send(unsigned char x)

void Serial(void)interrupt 4 using 1

unsigned char RxByte;

case 0x00:Lcounter = 0;break;

case 0xf9:Lcounter = 1;break;

case 0xa4:Lcounter = 2;break;

case 0xb0:Lcounter = 3;break;

case 0x99:Lcounter = 4;break;

case 0x92:Lcounter = 5;break;

case 0x82:Lcounter = 6;break;

case 0xF8:Lcounter = 7;break;

case 0x80:Lcounter = 8;break;

if(Scounter＞Lcounter)

if((Scounter - Lcounter) ＞ 2) //如果超过2%

FMcounter = Scounter - Lcounter;

alarmflg = 1; //报警标志位

alarmflg = 0; //清除

counter = counter + (unsigned char)sw7;

counter = counter + (unsigned char)sw6;

counter = counter + (unsigned char)sw5;

counter = counter + (unsigned char)sw4;

counter = counter + (unsigned char)sw3;

counter = counter + (unsigned char)sw2;

counter = counter + (unsigned char)sw1;

counter = counter + (unsigned char)sw0; //计算当前的负载

Send(SEGtable[counter]);