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/*
* This file contains the TTY driver for the serial ports on the erc32.
*
* This driver uses the termios pseudo driver.
*
* COPYRIGHT (c) 1989-1999.
* On-Line Applications Research Corporation (OAR).
*
* 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.
*
* $Id$
*/
#include <bsp.h>
#include <rtems/libio.h>
#include <stdlib.h>
#include <assert.h>
/*
* console_outbyte_polled
*
* This routine transmits a character using polling.
*/
void console_outbyte_polled(
int port,
char ch
)
{
if ( port == 0 ) {
while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEA) == 0 );
ERC32_MEC.UART_Channel_A = (int) ch;
return;
}
while ( (ERC32_MEC.UART_Status & ERC32_MEC_UART_STATUS_THEB) == 0 );
ERC32_MEC.UART_Channel_B = (int) ch;
}
/*
* console_inbyte_nonblocking
*
* This routine polls for a character.
*/
int console_inbyte_nonblocking( int port )
{
int UStat;
UStat = ERC32_MEC.UART_Status;
switch (port) {
case 0:
if (UStat & ERC32_MEC_UART_STATUS_ERRA) {
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRA;
ERC32_MEC.Control = ERC32_MEC.Control;
}
if ((UStat & ERC32_MEC_UART_STATUS_DRA) == 0)
return -1;
return (int) ERC32_MEC.UART_Channel_A;
return 1;
case 1:
if (UStat & ERC32_MEC_UART_STATUS_ERRB) {
ERC32_MEC.UART_Status = ERC32_MEC_UART_STATUS_CLRB;
ERC32_MEC.Control = ERC32_MEC.Control;
}
if ((UStat & ERC32_MEC_UART_STATUS_DRB) == 0)
return -1;
return (int) ERC32_MEC.UART_Channel_B;
default:
assert( 0 );
}
return -1;
}
/*
* DEBUG_puts
*
* This should be safe in the event of an error. It attempts to insure
* that no TX empty interrupts occur while it is doing polled IO. Then
* it restores the state of that external interrupt.
*
* Input parameters:
* string - pointer to debug output string
*
* Output parameters: NONE
*
* Return values: NONE
*/
void DEBUG_puts(
char *string
)
{
char *s;
unsigned32 old_level;
ERC32_Disable_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level );
for ( s = string ; *s ; s++ )
console_outbyte_polled( 0, *s );
console_outbyte_polled( 0, '\r' );
console_outbyte_polled( 0, '\n' );
ERC32_Restore_interrupt( ERC32_INTERRUPT_UART_A_RX_TX, old_level );
}
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