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;
}