EEPW论坛

我在书上看了一个单片机89c52的通讯程序，但不知道为什么不能编译，大神帮帮我，谢谢。 下面是书本里的程序 #include #define uchar unsigned char #define uint unsigned int void delayms(uint xms) { uint i,j; for(i=xms;i0;i--) for(j=100;j0;j--); } void send(uchar key_num) { SBUF=key_num; while(!TI ) TI=0; } void matrixkeyscan() { uchar temp,key; P3=0xfe; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delayms(10); temp=P3; temp=temp&0xf0; } if(temp!=0xf0) { temp=P3; switch(temp) { case 0xee: key=0; break; case 0xde: key=1; break; case 0xbe: key=2; break; case 0x7e: key=3; break; } while(temp!=0xf0) { temp=P3; temp=temp&0xf0; } send(key); } } P3=0xfd; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delayms(10); temp=P3; temp=temp&0xf0; if(temp!=0xf0) { temp=P3; switch(temp) { case 0xed: key=4; break; case 0xdd: key=5; break; case 0xbd: key=6; break; case 0x7d: key=7; break; } } while(temp=!0xf0) { temp=P3; temp=tenmp&0xf0; } send(key); } P3=0xfd; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delayms(10) ; temp=P3; temp=temp&0xf0; if(temp!=0xfe) { temp=P3; switch(temp) { case 0xeb: key=8; break; case 0xdd: key=9; break; case 0xbb: key=10; break; case 0x7b: key=11; break; } while(temp=!0xf0) { temp=P3; temp=tenmp&0xf0; } send(key); } } P3=0xf7; temp=P3; temp=temp&0xf0; if(temp!=0xf0) { delayms(10) ; temp=P3; temp=temp&0xf0; if(temp!=0xfe) { temp=P3; switch(temp) { case 0xe7: key=12; break; case 0xd7: key=13; break; case 0xb7: key=14; break; case 0x77: key=15; break; } while(temp=!0xf0) { temp=P3; temp=tenmp&0xf0; } send(key); } } void main() { TMOD=0x20; TH1=0xfd; TL1=0xfd; TR1=1; SM0=0; SM1=1; EA=1; ES=1; while(1) { matrixkeyscan(); } }