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/*

 *  This file contains the TTY driver for the serial ports on the LEON.

 *

 *  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.

 *

 *  debugputs.c,v 1.2 2001/04/23 13:19:35 joel Exp

 */

#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,

  unsigned char ch

)

{

  if ( port == 0 ) {

    while ( (LEON_REG.UART_Status_1 & LEON_REG_UART_STATUS_THE) == 0 );

      LEON_REG.UART_Channel_1 = (unsigned int) ch;

      return;

    }

    while ( (LEON_REG.UART_Status_2 & LEON_REG_UART_STATUS_THE) == 0 );

    LEON_REG.UART_Channel_2 = (unsigned int) ch;

}

/*

 *  console_inbyte_nonblocking

 *

 *  This routine polls for a character.

 */

int console_inbyte_nonblocking( int port )

{

  switch (port) {

    case 0:

      if (LEON_REG.UART_Status_1 & LEON_REG_UART_STATUS_ERR) {

        LEON_REG.UART_Status_1 = ~LEON_REG_UART_STATUS_ERR;

      }

      if ((LEON_REG.UART_Status_1 & LEON_REG_UART_STATUS_DR) == 0)

         return -1;

      return (int) LEON_REG.UART_Channel_1;

      return 1;

    case 1:

      if (LEON_REG.UART_Status_2 & LEON_REG_UART_STATUS_ERR) {

        LEON_REG.UART_Status_2 = ~LEON_REG_UART_STATUS_ERR;

      }

      if ((LEON_REG.UART_Status_2 & LEON_REG_UART_STATUS_DR) == 0)

         return -1;

      return (int) LEON_REG.UART_Channel_2;

    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;

  LEON_Disable_interrupt( LEON_INTERRUPT_UART_1_RX_TX, old_level );

  LEON_REG.UART_Control_1 = LEON_REG_UART_CTRL_TE;

    for ( s = string ; *s ; s++ )

      console_outbyte_polled( 0, *s );

    console_outbyte_polled( 0, '\r' );

    console_outbyte_polled( 0, '\n' );

  LEON_Restore_interrupt( LEON_INTERRUPT_UART_1_RX_TX, old_level );

}