echo.c

来自「PIC_Hi-Tech_C_Mike_Pearces_I2C_routines 」· C语言 代码 · 共 41 行

#include "config.h"

#include "serial.c"

//prototypes
char getch (void);
void putch (char c);

// read character from serial port, increment, echo it back 

// return 8 bit char from Recieve port 
char getch (void)
{
  while (!RCIF);
  return(RCREG);
}

// send 8 bit char to Recieve port 
void putch (char c)
{
  // wait until transmit reg empty 
  while (!TXIF);
  TXREG = c;
}

void main(void)
{
  unsigned char	c;
  // init serial port
  // 19200 in HSPLL mode, crystal = 7.3728 MHz 
  serial_init(95,1); 
  while(1) {
    c = getch (); // get a character
    c++;          // increment Char 
    putch(c);     // send the char 
  }

}