p0=0x00; 显示错误c202 undefined identifier p0=0x00;
p1=0x00; 显示错误c202 undefined identifier p1=0x00;
delay(500);
p0=0xff; 显示错误c202 undefined identifier p0=0xff;
p1=0xff; 显示错误c202 undefined identifier p1=0xff;
p口应该是大写的,头文件里面内容是:
/*--------------------------------------------------------------------------
reg52.h
header file for generic 80c52 and 80c32 microcontroller.
copyright (c) 1988-2001 keil elektronik gmbh and keil software, inc.
all rights reserved.
--------------------------------------------------------------------------*/
/* byte registers */
sfr p0 = 0x80; //p口是大写的
sfr p1 = 0x90;
sfr p2 = 0xa0;
sfr p3 = 0xb0;
sfr psw = 0xd0;
sfr acc = 0xe0;
sfr b = 0xf0;
sfr sp = 0x81;
sfr dpl = 0x82;
sfr dph = 0x83;
sfr pcon = 0x87;
sfr tcon = 0x88;
sfr tmod = 0x89;
sfr tl0 = 0x8a;
sfr tl1 = 0x8b;
sfr th0 = 0x8c;
sfr th1 = 0x8d;
sfr ie = 0xa8;
sfr ip = 0xb8;
sfr scon = 0x98;
sfr sbuf = 0x99;