main.c

常用的锁相环技术

   
	#include<stdio.h>
	#include<at89x52.h>
	/******************************************************************************/
	//函数名称:	Serial_init
	//功    能:	串口初始化
	//输入参数:	无
	//输出参数: 无
	/******************************************************************************/
	void Serial_init( void )
	{
		if( (SCON&0xf0) != 0x50 ) SCON = 0x52;
		PCON = 0x80;
		TMOD = ( TMOD&0x0f ) | 0x20;

		TH1 = -96;     //19200
		TR1 = 1;
		ES = 1;
	}


	main() 
 	{
 	 char a;
 	 int  b;
 	 long c;
	 unsigned char x;
	 unsigned int  y;
	 unsigned long z;
	 float f,g;
	 char buf [] = "Test String";
	 char *p = buf;
	 Serial_init();

	 a = 1;
	 b = 12365;
	 c = 0x7FFFFFFF;
	 x = 'A';
	 y = 54321;
	 z = 0x4A6F6E00;
	 f = 10.0;
	 g = 22.95;

	 printf ("char %bd  int %d  long %ld\n",a,b,c);
	 printf ("Uchar %bu Uint %u Ulong %lu\n",x,y,z);
	 printf ("xchar %bx xint %x xlong %lx\n",x,y,z);
	 printf ("String %s is at address %p\n",buf,p);
	 printf ("%f != %g\n", f, g);
	 printf ("%*f != %*g\n", 8, f, 8, g);
	}