usart.h

sdcc是为51等小型嵌入式cpu设计的c语言编译器支持数种不同类型的cpu

/*
 * USART communications module library header
 *
 * written for SDCC/pic16 port by Vangelis Rokas, 2005 <vrokas AT otenet.gr>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 *
 *
 * $Id: usart.h 3785 2005-06-24 14:19:36Z tecodev $
 */

#ifndef __USART_H__
#define __USART_H__

#pragma library io


#define RAM_SCLS	__data

/* configuration bit masks for open function */
#define USART_TX_INT_ON   0xff
#define USART_TX_INT_OFF  0x7f
#define USART_RX_INT_ON   0xff
#define USART_RX_INT_OFF  0xbf
#define USART_BRGH_HIGH   0xff
#define USART_BRGH_LOW    0xef
#define USART_CONT_RX     0xff
#define USART_SINGLE_RX   0xf7
#define USART_SYNC_MASTER 0xff
#define USART_SYNC_SLAVE  0xfb
#define USART_NINE_BIT    0xff
#define USART_EIGHT_BIT   0xfd
#define USART_SYNCH_MODE  0xff
#define USART_ASYNCH_MODE 0xfe

/* status bits */
union USART
{
  unsigned char val;
  struct
  {
    unsigned RX_NINE:1;
    unsigned TX_NINE:1;
    unsigned FRAME_ERROR:1;
    unsigned OVERRUN_ERROR:1;
    unsigned fill:4;
  };
};

void usart_open(unsigned char config, unsigned int spbrg) __wparam;
void usart_close(void);

unsigned char usart_busy(void) __naked;
unsigned char usart_drdy(void) __naked;

unsigned char usart_getc(void);
void usart_gets(RAM_SCLS char *buffer, unsigned char len);

void usart_putc(unsigned char data) __wparam __naked;
void usart_puts(char *data);


void usart_baud(unsigned char baudconfig) __wparam;

#endif