serial.c

来自「* Use 10 MHz crystal frequency. * Use 」· C语言 代码 · 共 50 行

#ifndef SERIAL_C
#define SERIAL_C


// standard header files for ascii IO functions,
// ascii manipulation functions
#include  <stdio.h>     
#include <ctype.h>
#include  <stdlib.h>    

void serial_init (char brg, char lo_speed);


void serial_init(char brg, char hi_speed)
{
  // setup Async communication 
  TX9 = 0;
  TXEN = 1; // transmit enable
  SYNC = 0; // async mode 
  if (hi_speed)   BRGH = 1; // hi speed mode 
  else BRGH = 0; // lo speed mode 
  SPBRG = brg;  
  bitset(TRISC, 7); // RC7 input  
  bitclr(TRISC, 6); // RC6 output 
  RX9 = 0;  // 8-bit reception  
  SPEN = 1; // serial port enable  
  CREN = 0; // clear enable first 
  CREN = 1; // now enable first 
#if   defined(__18CXX)
  stdout = _H_USER;   //do not use default MCC18 usart functions
                      // as we want to redefine them
#endif
  
}

#if   defined(__18CXX)
#ifndef LCD_PUTCH
void putch(char c);

void _user_putc (auto char c) {
    putch (c);
}
#endif
#endif 

#endif