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/*
* This file contains the DMV152 console IO package.
*
* COPYRIGHT (c) 1989, 1990, 1991, 1992, 1993, 1994.
* On-Line Applications Research Corporation (OAR).
* All rights assigned to U.S. Government, 1994.
*
* This material may be reproduced by or for the U.S. Government pursuant
* to the copyright license under the clause at DFARS 252.227-7013. This
* notice must appear in all copies of this file and its derivatives.
*
* $Id$
*/
#define D152_INIT
#include <rtems.h>
#include "console.h"
#include "bsp.h"
/* 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_id self,
rtems_unsigned32 *status
)
{
*status = 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
)
{
rtems_unsigned8 rr_0;
for ( ; ; ) {
Z8x30_READ_CONTROL( CONSOLE_CONTROL, RR_0, rr_0 );
if ( !(rr_0 & RR_0_RX_DATA_AVAILABLE) )
return( FALSE );
Z8x30_READ_DATA( CONSOLE_DATA, *ch );
return( TRUE );
}
}
/* inbyte
*
* This routine reads a character from the SCC.
*
* Input parameters: NONE
*
* Output parameters: NONE
*
* Return values:
* character read from SCC
*/
char inbyte( void )
{
rtems_unsigned8 rr_0;
char ch;
for ( ; ; ) {
Z8x30_READ_CONTROL( CONSOLE_CONTROL, RR_0, rr_0 );
if ( (rr_0 & RR_0_RX_DATA_AVAILABLE) != 0 )
break;
}
Z8x30_READ_DATA( CONSOLE_DATA, ch );
return ( ch );
}
/* outbyte
*
* This routine transmits a character out the SCC. It supports
* XON/XOFF flow control.
*
* Input parameters:
* ch - character to be transmitted
*
* Output parameters: NONE
*/
void outbyte(
char ch
)
{
rtems_unsigned8 rr_0;
char flow_control;
for ( ; ; ) {
Z8x30_READ_CONTROL( CONSOLE_CONTROL, RR_0, rr_0 );
if ( (rr_0 & RR_0_TX_BUFFER_EMPTY) != 0 )
break;
}
for ( ; ; ) {
Z8x30_READ_CONTROL( CONSOLE_CONTROL, RR_0, rr_0 );
if ( (rr_0 & RR_0_RX_DATA_AVAILABLE) == 0 )
break;
Z8x30_READ_DATA( CONSOLE_DATA, flow_control );
if ( flow_control == XOFF )
do {
do {
Z8x30_READ_CONTROL( CONSOLE_CONTROL, RR_0, rr_0 );
} while ( (rr_0 & RR_0_RX_DATA_AVAILABLE) == 0 );
Z8x30_READ_DATA( CONSOLE_DATA, flow_control );
} while ( flow_control != XON );
}
Z8x30_WRITE_DATA( CONSOLE_DATA, ch );
}
/*
* __read -- read bytes from the serial port. Ignore fd, since
* we only have stdin.
*/
int __read(
int fd,
char *buf,
int nbytes
)
{
int i = 0;
for (i = 0; i < nbytes; i++) {
*(buf + i) = inbyte();
if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
(*(buf + i++)) = '\n';
(*(buf + i)) = 0;
break;
}
}
return (i);
}
/*
* __write -- write bytes to the serial port. Ignore fd, since
* stdout and stderr are the same. Since we have no filesystem,
* open will only return an error.
*/
int __write(
int fd,
char *buf,
int nbytes
)
{
int i;
for (i = 0; i < nbytes; i++) {
if (*(buf + i) == '\n') {
outbyte ('\r');
}
outbyte (*(buf + i));
}
return (nbytes);
}
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