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/*=============================================================================

//

//      hal_diag.c

//

//      HAL diagnostic output code

//

//=============================================================================

//####ECOSGPLCOPYRIGHTBEGIN####

// -------------------------------------------

// This file is part of eCos, the Embedded Configurable Operating System.

// Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc.

//

// eCos is free software; you can redistribute it and/or modify it under

// the terms of the GNU General Public License as published by the Free

// Software Foundation; either version 2 or (at your option) any later version.

//

// eCos is distributed in the hope that it will be useful, but WITHOUT ANY

// WARRANTY; without even the implied warranty of MERCHANTABILITY or

// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

// for more details.

//

// You should have received a copy of the GNU General Public License along

// with eCos; if not, write to the Free Software Foundation, Inc.,

// 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.

//

// As a special exception, if other files instantiate templates or use macros

// or inline functions from this file, or you compile this file and link it

// with other works to produce a work based on this file, this file does not

// by itself cause the resulting work to be covered by the GNU General Public

// License. However the source code for this file must still be made available

// in accordance with section (3) of the GNU General Public License.

//

// This exception does not invalidate any other reasons why a work based on

// this file might be covered by the GNU General Public License.

//

// Alternative licenses for eCos may be arranged by contacting Red Hat, Inc.

// at http://sources.redhat.com/ecos/ecos-license/

// -------------------------------------------

//####ECOSGPLCOPYRIGHTEND####

//=============================================================================

//#####DESCRIPTIONBEGIN####

//

// Author(s):   nickg

// Contributors:        nickg

// Date:        1998-03-02

// Purpose:     HAL diagnostic output

// Description: Implementations of HAL diagnostic output support.

//

//####DESCRIPTIONEND####

//

//===========================================================================*/

#include <pkgconf/hal.h>

#include <cyg/infra/cyg_type.h>         // base types

#include <cyg/infra/cyg_trac.h>         // tracing macros

#include <cyg/infra/cyg_ass.h>          // assertion macros

#include <cyg/hal/hal_arch.h>

#include <cyg/hal/hal_diag.h>

#include <cyg/hal/hal_intr.h>

#include <cyg/hal/hal_io.h>

#include <cyg/hal/plf_stub.h>

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

#define CYG_KERNEL_DIAG_GDB

#endif

/*---------------------------------------------------------------------------*/

void hal_diag_init()

{

    cyg_hal_plf_comms_init();

}

/*---------------------------------------------------------------------------*/

void hal_diag_write_char(char c)

{

#ifdef CYG_KERNEL_DIAG_GDB    

    static char line[100];

    static int pos = 0;

    // No need to send CRs

    if( c == '\r' ) return;

    line[pos++] = c;

    if( c == '\n' || pos == sizeof(line) )

    {

        // Disable interrupts. This prevents GDB trying to interrupt us

        // while we are in the middle of sending a packet. The serial

        // receive interrupt will be seen when we re-enable interrupts

        // later.

        CYG_INTERRUPT_STATE oldstate;

        HAL_DISABLE_INTERRUPTS(oldstate);

        while(1)

        {

            static char hex[] = "0123456789ABCDEF";

            cyg_uint8 csum = 0;

            int i;

            char c1;

            cyg_hal_plf_serial_putc(NULL, '$');

            cyg_hal_plf_serial_putc(NULL, 'O');

            csum += 'O';

            for( i = 0; i < pos; i++ )

            {

                char ch = line[i];

                char h = hex[(ch>>4)&0xF];

                char l = hex[ch&0xF];

                cyg_hal_plf_serial_putc(NULL, h);

                cyg_hal_plf_serial_putc(NULL, l);

                csum += h;

                csum += l;

            }

            cyg_hal_plf_serial_putc(NULL, '#');

            cyg_hal_plf_serial_putc(NULL, hex[(csum>>4)&0xF]);

            cyg_hal_plf_serial_putc(NULL, hex[csum&0xF]);

            c1 = cyg_hal_plf_serial_getc( NULL );

            if( c1 == '+' ) break;

            if( cyg_hal_is_break( &c1 , 1 ) )

                cyg_hal_user_break( NULL );

        }

        pos = 0;

        // Wait for all data from serial line to drain

        // and clear ready-to-send indication.

//        hal_diag_drain_serial0();

        // Disabling the interrupts for an extended period of time

        // can provoke a spurious interrupt 0. FIXME - why?

#ifdef CYGSEM_HAL_MIPS_VR4300_VRC437X_DIAG_ACKS_INT_0

        HAL_INTERRUPT_ACKNOWLEDGE( CYGNUM_HAL_INTERRUPT_VRC437X );

#endif

        // And re-enable interrupts

        HAL_RESTORE_INTERRUPTS( oldstate );

    }

#else

    cyg_hal_plf_serial_putc(NULL, c);

#endif    

}

/*---------------------------------------------------------------------------*/

void hal_diag_read_char(char *c)

{

    *c = cyg_hal_plf_serial_getc(NULL);

}

/*---------------------------------------------------------------------------*/

/* End of hal_diag.c */