serio.c

来自「* Use 10 MHz crystal frequency. * Use 」· C语言 代码 · 共 59 行

#ifndef SERIO_C
#define SERIO_C

 //prototypes
 char getch (void);
 void putch (char c);
 void pcrlf (void);
 unsigned char getche (void);
 
// standard non-interrupt driven serial IO subroutines

// return 8 bit char from serial port
char getch (void)
{
  // wait until data available
  while (!RCIF){  
    // ok to wait forever for input
    // so clear watchdog timer
	// CLRWDT() instead of asm("clrwdt") for
	//portability between HI-TECH and Microchip compilers
    CLRWDT();  
  };
  return(RCREG);
}

// do not include if LCD 'putch' function is defined
#ifndef LCD_PUTCH
// send 8 bit char to serial port
void putch (char c)
{
  // wait until transmit reg empty 
  while (!TXIF){
    CLRWDT();
    };  
  TXREG = c;
  CLRWDT();  
}

#endif
#define SERIAL_PUTCH 1
     
void pcrlf (void)
{
  putch(0x0a); //line feed
  putch(0x0d); //carriage return
}

// needed by scanf library call, 
// get character and echo
unsigned char getche (void){
  unsigned char c;
  c = getch();
  putch(c);
  return(c);
}

#endif