tprintf.c

来自「单片及c语言轻松入门的随书光盘」· C语言 代码 · 共 42 行

#include <reg52.h>
#include <math.h>
#include <stdio.h> /*为使用printf函数而加入*/

void tst_printf (void)  {
  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;

  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);
}

void main()
{	SCON  = 0x50;    /*SCON:工作模式1，8-bit UART，允许接收*/
	TMOD |= 0x20;    /*TMOD：定时器T1，工作模式2, 8位自动重载方式*/
	TH1   = 0xf3;    /*当波特率为2400时，定时器初值*/
	TR1   = 1;       /*定时器T1开始运行*/
	TI    = 1;       /*允许发送数据*/
	for(;;)
		tst_printf ();
}