/*
* This file contains the Force CPU386 console IO package.
*
* COPYRIGHT (c) 1989-1997.
* On-Line Applications Research Corporation (OAR).
* Copyright assigned to U.S. Government, 1994.
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.OARcorp.com/rtems/license.html.
*
* $Id$
*/
#define F386_INIT
#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
/* console_cleanup
*
* This routine is called at exit to clean up the console hardware.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
void console_cleanup( void )
{
register rtems_unsigned8 ignored;
/*
* FORCE technical support mentioned that it may be necessary to
* read the DUSCC RX_BUFFER port four times to remove all junk.
* This code is a little more paranoid.
*/
inport_byte( RX_BUFFER, ignored );
inport_byte( RX_BUFFER, ignored );
inport_byte( RX_BUFFER, ignored );
inport_byte( RX_BUFFER, ignored );
inport_byte( RX_BUFFER, ignored );
}
/* console_initialize
*
* This routine initializes the console IO driver.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
/*
* flush the console now and at exit. Just in case.
*/
console_cleanup();
status = rtems_io_register_name(
"/dev/console",
major,
(rtems_device_minor_number) 0
);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
atexit( console_cleanup );
return RTEMS_SUCCESSFUL;
}
/* is_character_ready
*
* This routine returns TRUE if a character is available.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
*/
rtems_boolean is_character_ready(
char *ch
)
{
register rtems_unsigned8 status;
inport_byte( RX_STATUS, status );
if ( Is_rx_ready( status ) ) {
inport_byte( RX_BUFFER, status );
*ch = status;
return TRUE;
}
return FALSE;
}
/* inbyte
*
* This routine reads a character from the UART.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
* character read from UART
*/
char inbyte( void )
{
register rtems_unsigned8 status;
char ch;
do {
inport_byte( RX_STATUS, status );
} while ( !Is_rx_ready( status ) );
#if ( PORTB == 1 )
/*
* Force example code resets the Channel B Receiver here.
* It appears to cause XON's to be lost.
*/
/* outport_byte( RX_STATUS, 0x10 ); */
#endif
inport_byte( RX_BUFFER, ch );
return ch;
}
/* outbyte
*
* This routine transmits a character out the port. It supports
* XON/XOFF flow control.
*
* Input parameters:
* ch - character to be transmitted
*
* Output parameters: NONE
*/
void outbyte(
char ch
)
{
rtems_unsigned8 status;
do {
inport_byte( TX_STATUS, status );
} while ( !Is_tx_ready( status ) );
#if 0
while ( is_character_ready( &status ) == TRUE ) { /* must be an XOFF */
if ( status == XOFF )
do {
while ( is_character_ready( &status ) == FALSE ) ;
} while ( status != XON );
}
#endif
outport_byte( TX_BUFFER, ch );
}
/*
* Open entry point
*/
rtems_device_driver console_open(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* Close entry point
*/
rtems_device_driver console_close(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}
/*
* read bytes from the serial port. We only have stdin.
*/
rtems_device_driver console_read(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
rtems_libio_rw_args_t *rw_args;
char *buffer;
int maximum;
int count = 0;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
buffer[ count ] = inbyte();
if (buffer[ count ] == '\n' || buffer[ count ] == '\r') {
buffer[ count++ ] = '\n';
break;
}
}
rw_args->bytes_moved = count;
return (count >= 0) ? RTEMS_SUCCESSFUL : RTEMS_UNSATISFIED;
}
/*
* write bytes to the serial port. Stdout and stderr are the same.
*/
rtems_device_driver console_write(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
int count;
int maximum;
rtems_libio_rw_args_t *rw_args;
char *buffer;
rw_args = (rtems_libio_rw_args_t *) arg;
buffer = rw_args->buffer;
maximum = rw_args->count;
for (count = 0; count < maximum; count++) {
if ( buffer[ count ] == '\n') {
outbyte('\r');
}
outbyte( buffer[ count ] );
}
rw_args->bytes_moved = maximum;
return 0;
}
/*
* IO Control entry point
*/
rtems_device_driver console_control(
rtems_device_major_number major,
rtems_device_minor_number minor,
void * arg
)
{
return RTEMS_SUCCESSFUL;
}