hal_diag.c

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        irq_state = 0;

        chan->base->utcr3 &= ~SA11X0_UART_RX_FIFO_INT_ENABLED;

        HAL_INTERRUPT_MASK(chan->isr_vector);
        break;
    case __COMMCTL_DBG_ISR_VECTOR:
        ret = chan->isr_vector;
        break;
    case __COMMCTL_SET_TIMEOUT:
        ret = chan->msec_timeout;
        chan->msec_timeout = va_arg(ap, cyg_uint32);
        break;
    default:
        break;
    }
    va_end(ap);
    CYGARC_HAL_RESTORE_GP();
    return ret;
}

static int
cyg_hal_plf_serial_isr(void *__ch_data, int* __ctrlc, 
                       CYG_ADDRWORD __vector, CYG_ADDRWORD __data)
{
    int res = 0;
    channel_data_t* chan = (channel_data_t*)__ch_data;
    char c;
    int reg;
    CYGARC_HAL_SAVE_GP();

    reg = chan->base->utsr1;

    // read it anyway just in case - no harm done and we might prevent an
    // interrupt loop
    c = (char)chan->base->utdr;

    // Clear receiver idle status bit, to allow another interrupt to
    // occur in the case where the receive fifo is almost empty.
    // Also for a break interrupt; these are sticky and nonmaskable.
    chan->base->utsr0 = (SA11X0_UART_RX_IDLE |
                         SA11X0_UART_RX_BEGIN_OF_BREAK |
                         SA11X0_UART_RX_END_OF_BREAK      );

    cyg_drv_interrupt_acknowledge(chan->isr_vector);

    *__ctrlc = 0;
    if ( (reg & SA11X0_UART_RX_FIFO_NOT_EMPTY) != 0 ) {
        if( cyg_hal_is_break( &c , 1 ) )
            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;
    }

    CYGARC_HAL_RESTORE_GP();
    return res;
}

static void
cyg_hal_plf_serial_init(void)
{
    hal_virtual_comm_table_t* comm;
    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);
    int i;

    // Init channels
#define NUMOF(x) (sizeof(x)/sizeof(x[0]))
    for (i = 0;  i < NUMOF(ser_channels);  i++) {
        init_channel(&ser_channels[i]);
        CYGACC_CALL_IF_SET_CONSOLE_COMM(i);
        comm = CYGACC_CALL_IF_CONSOLE_PROCS();
        CYGACC_COMM_IF_CH_DATA_SET(*comm, &ser_channels[i]);
        CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_serial_write);
        CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_serial_read);
        CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_serial_putc);
        CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_serial_getc);
        CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_serial_control);
        CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_serial_isr);
        CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_serial_getc_timeout);
    }
     
    // Restore original console
    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
}

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

    if (initialized)
        return;

    initialized = 1;

    cyg_hal_plf_serial_init();
}

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

#ifndef CYGSEM_HAL_VIRTUAL_VECTOR_DIAG

#include <cyg/hal/hal_stub.h>           // cyg_hal_gdb_interrupt

#if (CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL == 0)
# define __BASE ((void*)SA11X0_UART1_BASE)
# define CYGHWR_HAL_GDB_PORT_VECTOR CYGNUM_HAL_INTERRUPT_UART1
#else
# define __BASE ((void*)SA11X0_UART3_BASE)
# define CYGHWR_HAL_GDB_PORT_VECTOR CYGNUM_HAL_INTERRUPT_UART3
#endif

#ifdef CYGSEM_HAL_ROM_MONITOR
#define CYG_HAL_STARTUP_ROM
#undef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
#endif

#if defined(CYG_HAL_STARTUP_ROM) && !defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
#define HAL_DIAG_USES_HARDWARE
#elif !defined(CYGDBG_HAL_DIAG_TO_DEBUG_CHAN)
#define HAL_DIAG_USES_HARDWARE
#elif CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL != CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL
#define HAL_DIAG_USES_HARDWARE
#endif

static channel_data_t ser_channel = {
    (volatile struct sa11x0_serial*)__BASE, 0, CYGHWR_HAL_GDB_PORT_VECTOR
};

void 
hal_diag_init(void)
{
    // Init serial device
    init_channel(&ser_channel);
}

#ifdef HAL_DIAG_USES_HARDWARE

#ifdef DEBUG_DIAG
#ifndef CYG_HAL_STARTUP_ROM
#define DIAG_BUFSIZE 2048
static char diag_buffer[DIAG_BUFSIZE];
static int diag_bp = 0;
#endif
#endif

void hal_diag_read_char(char *c)
{
    *c = cyg_hal_plf_serial_getc(&ser_channel);
}

void hal_diag_write_char(char c)
{
#ifdef DEBUG_DIAG
#ifndef CYG_HAL_STARTUP_ROM
    diag_buffer[diag_bp++] = c;
    if (diag_bp == sizeof(diag_buffer)) diag_bp = 0;
#endif
#endif
    cyg_hal_plf_serial_putc(&ser_channel, c);
}

#else // not HAL_DIAG_USES_HARDWARE - it uses GDB protocol

void 
hal_diag_read_char(char *c)
{
    *c = cyg_hal_plf_serial_getc(&ser_channel);
}

void 
hal_diag_write_char(char c)
{
    static char line[100];
    static int pos = 0;

    // FIXME: Some LED blinking might be nice right here.

    // 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)
        {
            static char hex[] = "0123456789ABCDEF";
            cyg_uint8 csum = 0;
            int i;
#ifndef CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
            char c1;
#endif        
            cyg_hal_plf_serial_putc(&ser_channel, '$');
            cyg_hal_plf_serial_putc(&ser_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_serial_putc(&ser_channel, h);
                cyg_hal_plf_serial_putc(&ser_channel, l);
                csum += h;
                csum += l;
            }
            cyg_hal_plf_serial_putc(&ser_channel, '#');
            cyg_hal_plf_serial_putc(&ser_channel, hex[(csum>>4)&0xF]);
            cyg_hal_plf_serial_putc(&ser_channel, hex[csum&0xF]);

#ifdef CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT

            break; // regardless

#else // not CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT Ie. usually...

            // Wait for the ACK character '+' from GDB here and handle
            // receiving a ^C instead.  This is the reason for this clause
            // being a loop.
            c1 = cyg_hal_plf_serial_getc(&ser_channel);

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

#ifdef CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT
            cyg_drv_interrupt_acknowledge(CYGHWR_HAL_GDB_PORT_VECTOR);
            if( c1 == 3 ) {
                // Ctrl-C: breakpoint.
                cyg_hal_gdb_interrupt(
                    (target_register_t)__builtin_return_address(0) );
                break;
            }
#endif // CYGDBG_HAL_DEBUG_GDB_BREAK_SUPPORT

#endif // ! CYGDBG_HAL_DEBUG_GDB_CTRLC_SUPPORT
            // 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
        
    }
}
#endif

#endif // !CYGSEM_HAL_VIRTUAL_VECTOR_DIAG


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