//=============================================================================
//
//      hal_diag.c
//
//      HAL diagnostic output code
//
//=============================================================================
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// -------------------------------------------                              
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//
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// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License    
// for more details.                                                        
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//
// 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   
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// General Public License v2.                                               
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//=============================================================================
//#####DESCRIPTIONBEGIN####
//
// Author(s):    nickg, jskov
// Contributors: nickg, jskov
// Date:         1999-03-23
// Purpose:      HAL diagnostic output
// Description:  Implementations of HAL diagnostic output support.
//
//####DESCRIPTIONEND####
//
//=============================================================================

#include <pkgconf/hal.h>

#include <cyg/hal/hal_diag.h>           // our header.

#include <cyg/infra/cyg_type.h>         // base types, externC
#include <cyg/hal/hal_io.h>             // IO macros
#include <cyg/hal/hal_if.h>             // calling interface API
#include <cyg/hal/hal_intr.h>           // Interrupt macros
#include <cyg/hal/sh3_sci.h>            // driver API
#include <cyg/hal/hal_misc.h>           // Helper functions

#define SCI_BASE ((cyg_uint8*)0xfffffe80)

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

void
cyg_hal_plf_comms_init(void)
{
    static int initialized = 0;

    if (initialized)
        return;

    initialized = 1;

    cyg_hal_plf_sci_init(0, 0, CYGNUM_HAL_INTERRUPT_SCI_RXI, SCI_BASE);
}

//=============================================================================
// Led control
//=============================================================================
#define LED   0xa8000000

void
hal_diag_led_on( void )
{
    HAL_WRITE_UINT8(LED, 0x18);
}

void
hal_diag_led_off( void )
{
    HAL_WRITE_UINT8(LED, 0);
}

//=============================================================================
// Compatibility with older stubs
//=============================================================================

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

#define CYGPRI_HAL_SH_SH3_SCI_PRIVATE
#include <cyg/hal/sh3_sci.h>            // driver API

static channel_data_t channel = { (cyg_uint8*)SCI_BASE, 0, 0};

#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
#include <cyg/hal/hal_stub.h>           // hal_output_gdb_string
#endif

#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs)

#define CYG_HAL_DIAG_GDB

#elif defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)

#define CYG_HAL_DIAG_GDB

#endif

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

void hal_diag_init(void)
{
    cyg_hal_plf_sci_init_channel(&channel);
}

void 
hal_diag_write_char_serial( char c )
{
    cyg_hal_plf_sci_putc(&channel, c);
}

void
hal_diag_read_char(char *c)
{
    *c = (char) cyg_hal_plf_sci_getc(&channel);
}

// Packet function
void 
hal_diag_write_char(char c)
{
#ifdef CYG_HAL_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) )
    {
        CYG_INTERRUPT_STATE old;

        // 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.
        
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
        CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION(old);
#else
        HAL_DISABLE_INTERRUPTS(old);
#endif
        
        while(1)
        {
            char c1;
            static char hex[] = "0123456789ABCDEF";
            cyg_uint8 csum = 0;
            int i;
        
            cyg_hal_plf_sci_putc(&channel, '$');
            cyg_hal_plf_sci_putc(&channel, '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_sci_putc(&channel, h);
                cyg_hal_plf_sci_putc(&channel, l);
                csum += h;
                csum += l;
            }
            cyg_hal_plf_sci_putc(&channel, '#');
            cyg_hal_plf_sci_putc(&channel, hex[(csum>>4)&0xF]);
            cyg_hal_plf_sci_putc(&channel, hex[csum&0xF]);

            // Wait for the ACK character '+' from GDB here and handle
            // receiving a ^C instead.
            c1 = (char) cyg_hal_plf_sci_getc(&channel);

            if( c1 == '+' )
                break;              // a good acknowledge

            // Check for user break.
            if( cyg_hal_is_break( &c1, 1 ) )
                cyg_hal_user_break( NULL );

            // otherwise, loop round again
        }
        
        pos = 0;

        // And re-enable interrupts
#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
        CYG_HAL_GDB_LEAVE_CRITICAL_IO_REGION(old);
#else
        HAL_RESTORE_INTERRUPTS(old);
#endif
    }
#else // CYG_HAL_DIAG_GDB
    cyg_hal_plf_sci_putc(&channel, c);
#endif
}

#endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

//-----------------------------------------------------------------------------
// End of hal_diag.c
