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/*
* This file contains the Motorola IDP console IO package.
*/
/*
* Written by Doug McBride, Colorado Space Grant College
* Based off of the board support packages of RTEMS
*
* Updated to RTEMS 3.2.0 by Joel Sherrill.
*/
#define MIDP_INIT
#include <bsp.h>
#include <rtems/libio.h>
#include <rtems/ringbuf.h>
Ring_buffer_t Console_Buffer[ 2 ];
rtems_isr C_Receive_ISR(rtems_vector_number vector);
/* console_initialize
*
* This routine initializes the console IO driver.
*/
rtems_device_driver console_initialize(
rtems_device_major_number major,
rtems_device_minor_number minor,
void *arg
)
{
rtems_status_code status;
Ring_buffer_Initialize( &Console_Buffer[ 0 ] );
Ring_buffer_Initialize( &Console_Buffer[ 1 ] );
init_pit();
status = rtems_io_register_name(
"/dev/console",
major,
(rtems_device_minor_number) 0
);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
status = rtems_io_register_name(
"/dev/tty00",
major,
(rtems_device_minor_number) 0
);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
status = rtems_io_register_name(
"/dev/tty01",
major,
(rtems_device_minor_number) 1
);
if (status != RTEMS_SUCCESSFUL)
rtems_fatal_error_occurred(status);
return RTEMS_SUCCESSFUL;
}
/* is_character_ready
*
* This routine returns TRUE if a character is available.
*/
static bool is_character_ready(
char *ch,
int port
)
{
if ( Ring_buffer_Is_empty( &Console_Buffer[ port ] ) )
return false;
Ring_buffer_Remove_character( &Console_Buffer[ port ], *ch );
return true;
}
/* inbyte
*
* This routine reads a character from the UART through a buffer.
*/
static char inbyte(
int port
)
{
char tmp_char;
/* If you come into this routine without checking is_character_ready() first
and you want nonblocking code, then it's your own fault */
while ( !is_character_ready( &tmp_char, port ) );
return tmp_char;
}
/* outbyte
*
* This routine transmits a character out the M68681. It supports
* XON/XOFF flow control.
*/
static void outbyte(
char ch,
int port
)
{
switch ( port ) {
case 0:
transmit_char( ch );
break;
case 1:
transmit_char_portb( ch );
break;
}
}
/*
* 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;
if ( minor > 1 )
return RTEMS_INVALID_NUMBER;
for (count = 0; count < maximum; count++) {
buffer[ count ] = inbyte( minor );
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;
if ( minor > 1 )
return RTEMS_INVALID_NUMBER;
for (count = 0; count < maximum; count++) {
if ( buffer[ count ] == '\n') {
outbyte('\r', minor );
}
outbyte( buffer[ count ], minor );
}
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;
}
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