/usr/share/sdcc/include/pic16/usart.h is in sdcc-libraries 2.9.0-5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* 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
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