hello.c

关键字：LCD液晶显示屏 串行 并行 ST7920 RT12864

/*------------------------------------------------------------------------------
HELLO.C

Copyright 1995-1999 Keil Software, Inc.
------------------------------------------------------------------------------*/

#include <REG52.H>                /* special function register declarations   */
                                  /* for the intended 8051 derivative         */

#include <stdio.h>                /* prototype declarations for I/O functions */


#ifdef MONITOR51                         /* Debugging with Monitor-51 needs   */
char code reserve [3] _at_ 0x23;         /* space for serial interrupt if     */
#endif                                   /* Stop Exection with Serial Intr.   */
                                         /* is enabled                        */


/*------------------------------------------------
The main C function.  Program execution starts
here after stack initialization.
------------------------------------------------*/
//#define FREQ_OS       24000000L 
#define FREQ_OS       18432000L 
#define RATE      9600L
#define BIT_SMODE 1

#if BIT_SMODE
#define BAUD_CHAR (256 - (unsigned char)( (2L*FREQ_OS)/(32L*12L*RATE) ) )
#else   
#define BAUD_CHAR (256 - (unsigned char)( FREQ_OS/(32L*12L*RATE) ) )
#endif

#define baud9600 (256-13)       //24M/SMODE=1

#if 0


void init_serial(void)
{
    SCON  = 0x50;		        /* SCON: mode 1, 8-bit UART, enable rcvr      */
    TMOD |= 0x20;               /* TMOD: timer 1, mode 2, 8-bit reload        */
//    TH1   = baud9600;
    TH1   = BAUD_CHAR ;         /* TH1:  reload value for 1200 baud @ 16MHz   */
    TR1   = 1;                  /* TR1:  timer 1 run                          */
    TI    = 1;                  /* TI:   set TI to send first char of UART    */
	RI=0;
#if BIT_SMODE
    PCON  |=0x80;
#else 
    PCON  &=0x7f;
#endif
}

void putc(char x)
{
    while(!TI); 
	TI=0;
	SBUF=x;	
}

char getc(void)
{
    while(!RI); 
	RI=0;
	return(SBUF);	
}

void wputs(char s[])
{
  unsigned char i;
  for(i=0;s[i];i++)
	{
      while(!TI); 
	  TI=0;
	  SBUF=s[i];	
    }
}


unsigned char wgets(char s[])
{
   unsigned char i;
   for(i=0;i<20;i++)
   {
      while(!RI); 
	  RI=0;
	  if(SBUF==0x0d) break;
	  s[i]=SBUF;
	  putc(SBUF);
   }
  s[i]=0;
  return(i);	
}

void LCD_GRP(unsigned char const *string_num);
void  LCD_INIT(void);
void  LCD_CLS(void);
int mainxx (void);
char GetAdc(char s[]);
void mainxxxx (void) {
  int i,j;
  char c;
  idata char s[20];

  unsigned char const *string_num="1234567890";
  init_serial();
  //LCD_INIT();
  //LCD_CLS();
  //LCD_GRP(string_num);
  wputs("hello mcs51");
  mainxx();
  while (1) 
   {
   // P1^0= 0x01;     		    /* Toggle P1.0 each time we print */  
    //for(i=0;i<1000;i++) 
	//for(j=0;j<100;j++);
	c=wgets(s);
	if(c>0)
     wputs("...");
	c=getc();
   putc(c);	
  }
}



#endif