求大神帮我看个程序。 -

标题: 求大神帮我看个程序。 [打印本页]

作者: minghua0 时间: 2012-7-10 16:09
标题: 求大神帮我看个程序。

为什么给串口送的都是0。

#include<reg51.h>
#define uchar unsigned char
#define uint unsigned int
uchar a ,b;
uchar code table[] = {0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71,0x00};
sbit dula = P2^6;
sbit wela = P2^7;
void Key_Scan();
void xianshi();
void fa_jian(uchar Num);
uchar KeyNo = 16;
uchar Pre_KeyNo = 16;
uchar Timer = 0 ,flag = 0;
void delayms(uint ms)
{
   uint i,j;
   for(i = ms;i > 0;i --)
     for(j = 110;j > 0;j --);
}
void init()
{
   TMOD = 0x21;    //开定时器T0工作方式1于T1工作方式2
   TH0 = (65536 - 5000)/256;
   TL0 = (65536 - 5000)%256;  //设置5ms初值
   TR0 =1; //启动定时器0
   ET0 = 1;     //开定时器中断0
   TH1 = 0xfd;
   TL1 = 0xfd;  //设置波特率为9600bps
   TR1 = 1;    //启动定时器2
   REN = 1;  //允许串口接收
   SM0 = 0;
   SM1 = 1;  //设置串口工作方式1
   EA = 1;    //开总中断
   ES = 1;    //开串口中断
}
void main()
{
   init();
   while(1)
{
    if(flag == 1)
{
flag = 0;
xianshi();
   fa_jian(KeyNo);

}
   }
}

void Key_Scan()
{
   uchar Tmp;
   P3 = 0x0f;
   delayms(1);
   Tmp = P3^0x0f;
   switch(Tmp)
   {
      case 1: KeyNo = 0; break;
   case 2: KeyNo = 1; break;
   case 4: KeyNo = 2; break;
   case 8: KeyNo = 3; break;
default: KeyNo = 16;
   }
   P3 = 0xf0;
   delayms(1);
   Tmp = (P3 >> 4) ^ 0x0f;
   switch(Tmp)
   {
       case 1: KeyNo += 0; break;
    case 2: KeyNo += 4; break;
    case 4: KeyNo += 8; break;
    case 8: KeyNo += 12;
   }
}
void ser() interrupt 4
{
   if(RI == 1)
   {
    RI = 0;
// a = SBUF;
   }
}

void fa_jian(uchar Num)
{
    ES = 0;
    SBUF = Num;
    while(!TI);
    TI = 0;
    ES = 1;
}

void xianshi()
{
      P3 = 0xf0;
   if(P3 != 0xf0) Key_Scan();
   if( KeyNo < 16)
   {
    dula = 1;
    P0 = table[KeyNo];
    dula = 0;
    P0 = 0xff;

    wela = 1;
    P0 = 0xfe;
    wela = 0;
    delayms(5);
    }
}
void T0_Timer() interrupt 1
{
   TH0 = (65536 - 5000)/256;
   TL0 = (65536 - 5000)%256;
   if(++Timer == 20)
   {
      Timer = 0;
   flag = 1;
   }
}

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