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/*
* This file contains the MVME162 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.
*
* Modifications of respective RTEMS file: COPYRIGHT (c) 1994.
* EISCAT Scientific Association. M.Savitski
*
* This material is a part of the MVME162 Board Support Package
* for the RTEMS executive. Its licensing policies are those of the
* RTEMS above.
*
* $Id$
*/
#define M162_INIT
#include <rtems.h>
#include "console.h"
#include "bsp.h"
#include "ringbuf.h"
Ring_buffer_t Buffer[2];
/*
* Interrupt handler for receiver interrupts
*/
rtems_isr C_Receive_ISR(rtems_vector_number vector)
{
register int ipend, port;
ZWRITE0(1, 0x38); /* reset highest IUS */
ipend = ZREAD(1, 3); /* read int pending from A side */
if (ipend == 0x04) port = 0; /* channel B intr pending */
else if (ipend == 0x20) port = 1; /* channel A intr pending */
else return;
Ring_buffer_Add_character(&Buffer[port], ZREADD(port));
if (ZREAD(port, 1) & 0x70) { /* check error stat */
ZWRITE0(port, 0x30); /* reset error */
}
}
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg,
rtems_id self,
rtems_unsigned32 *status
)
{
int i;
/*
* Initialise receiver interrupts on both ports
*/
for (i = 0; i <= 1; i++) {
Ring_buffer_Initialize( &Buffer[i] );
ZWRITE(i, 2, SCC_VECTOR);
ZWRITE(i, 10, 0);
ZWRITE(i, 1, 0x10); /* int on all Rx chars or special condition */
ZWRITE(i, 9, 8); /* master interrupt enable */
}
set_vector(C_Receive_ISR, SCC_VECTOR, 1); /* install ISR for ports A and B */
mcchip->vector_base = 0;
mcchip->gen_control = 2; /* MIEN */
mcchip->SCC_int_ctl = 0x13; /* SCC IEN, IPL3 */
*status = RTEMS_SUCCESSFUL;
}
/*
* Non-blocking char input
*/
rtems_boolean char_ready(int port, char *ch)
{
if ( Ring_buffer_Is_empty( &Buffer[port] ) )
return FALSE;
Ring_buffer_Remove_character( &Buffer[port], *ch );
return TRUE;
}
/*
* Block on char input
*/
char char_wait(int port)
{
unsigned char tmp_char;
while ( !char_ready(port, &tmp_char) );
return tmp_char;
}
/*
* This routine transmits a character out the SCC. It no longer supports
* XON/XOFF flow control.
*/
void char_put(int port, char ch)
{
while (1) {
if (ZREAD0(port) & TX_BUFFER_EMPTY) break;
}
ZWRITED(port, ch);
}
/*
* Map port A (1) to stdin, stdout, and stderr.
* Map everything else to port B (0).
*/
int __read(int fd, char *buf, int nbytes)
{
int i, port;
if ( fd <= 2 ) port = 1;
else port = 0;
for (i = 0; i < nbytes; i++) {
*(buf + i) = char_wait(port);
if ((*(buf + i) == '\n') || (*(buf + i) == '\r')) {
(*(buf + i++)) = '\n';
(*(buf + i)) = 0;
break;
}
}
return (i);
}
/*
* Map port A (1) to stdin, stdout, and stderr.
* Map everything else to port B (0).
*/
int __write(int fd, char *buf, int nbytes)
{
int i, port;
if ( fd <= 2 ) port = 1;
else port = 0;
for (i = 0; i < nbytes; i++) {
if (*(buf + i) == '\n') {
char_put (port, '\r');
}
char_put (port, *(buf + i));
}
return (nbytes);
}
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