pcmb_screen.c

开放源码实时操作系统源码.

static int KBIndexTab[8] = { 0, 1, 2, 2, 3, 3, 3, 3 };

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

static void KeyboardInit
(
	void
)
{
    KBFlags = 0;
	
} /* KeyboardInit */

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

static CYG_BYTE KeyboardAscii
(
	CYG_BYTE	scancode
)
{
    CYG_BYTE ascii = 0xFF;

    // Start by handling all shift/ctl keys:

    switch( scancode )
    {
    case 0x53:  // delete
        if (KBFlags & KBCtrl && KBFlags & KBAlt)
        {
            CYGACC_CALL_IF_RESET();
        }
        break;

    case 0xe0:
        KBFlags |= KBExtend;
        return 0xFF;

    case 0xfa:
        KBFlags |= KBAck;
        return 0xFF;

    case 0xfe:
        KBFlags |= KBResend;
        return 0xFF;

    case LSHIFT:
        KBFlags |= KBShiftL;
        return 0xFF;

    case LSHIFT | BREAK:
        KBFlags &= ~KBShiftL;
        return 0xFF;

    case RSHIFT:
        KBFlags |= KBShiftR;
        return 0xFF;

    case RSHIFT | BREAK:
        KBFlags &= ~KBShiftR;
        return 0xFF;

    case CTRL:
        if( KBFlags & KBExtend )
        {
            KBFlags |= KBCtrlR;
            KBFlags &= ~KBExtend;
        }
        else	KBFlags |= KBCtrlL;
        return 0xFF;

    case CTRL | BREAK:
        if( KBFlags & KBExtend )
        {
            KBFlags &= ~KBCtrlR;
            KBFlags &= ~KBExtend;
        }
        else	KBFlags &= ~KBCtrlL;
        return 0xFF;


    case ALT:
        if( KBFlags & KBExtend )
        {
            KBFlags |= KBAltR;
            KBFlags &= ~KBExtend;
        }
        else	KBFlags |= KBAltL;
        return 0xFF;

    case ALT | BREAK:
        if( KBFlags & KBExtend )
        {
            KBFlags &= ~KBAltR;
            KBFlags &= ~KBExtend;
        }
        else	KBFlags &= ~KBAltL;
        return 0xFF;

    case CAPS:
        KBFlags ^= KBCapsLock;
    case CAPS | BREAK:
        return 0xFF;

    case NUMS:
        KBFlags ^= KBNumLock;
    case NUMS | BREAK:
        return 0xFF;
    }

    // Clear Extend flag if set
    KBFlags &= ~KBExtend;

    // Ignore all other BREAK codes
    if( scancode & 0x80 ) return 0xFF;

    // Here the scancode is for something we can turn
    // into an ASCII value

    ascii = KBScanTable[scancode & 0x7F][KBIndexTab[KBFlags & KBIndex]];

    return ascii;

} /* KeyboardAscii */

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

static int KeyboardTest
(
	void
)
{
    // If there is a pending character, return True
    if( KBPending != 0xFF ) return true;


    // If there is something waiting at the port, get it
    for(;;) 
    {
        CYG_BYTE stat, code;
        CYG_BYTE c;
        
        HAL_READ_UINT8( KBSTATPORT, stat );

        if( (stat & 0x01) == 0 )
            break;

        HAL_READ_UINT8( KBDATAPORT, code );

        // Translate to ASCII
        c = KeyboardAscii(code);
		
        // if it is a real ASCII char, save it and
        // return True.
        if( c != 0xFF )
        {
            KBPending = c;
            return true;
        }

    }

    // Otherwise return False
    return false;
	
} /* KeyboardTest */

//=============================================================================
// Basic IO functions

static void
cyg_hal_plf_screen_init_channel(void* __ch_data)
{
    KeyboardInit();
    
    XPos	= 0;
    YPos	= 0;

    ClearScreen();
    MoveCursor();
}


void
cyg_hal_plf_screen_putc(void *__ch_data, char ch)
{
    CYGARC_HAL_SAVE_GP();

	switch( ch )
	{
	case '\n':
		NewLine();
		return;

	case '\r':
		XPos = 0;
		MoveCursor();
		return;

	case '\b':
		if( XPos == 0 ) return;
		XPos--;
		MoveCursor();
		return;

	case '\t':
		do
		{
			DisplayChar(' ');
		} while( (XPos % 8) != 0 );
		return;

	case 0x0c:
		ClearScreen();
		XPos = YPos = 0;
		MoveCursor();
		return;		

	case 1:
		ScrollUp(1);
		XPos = 0;
		YPos = ScreenLength-1;
		return;

	case 2:
		ScrollDown(1);
		XPos = 0;
		YPos = 0;
		return;
	
		
	default:
		DisplayChar(ch);
		return;
	}

    CYGARC_HAL_RESTORE_GP();
}

static cyg_bool
cyg_hal_plf_screen_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    if( !KeyboardTest() )
        return false;

    *ch = KBPending;
    KBPending = 0xFF;

    return true;
}

cyg_uint8
cyg_hal_plf_screen_getc(void* __ch_data)
{
    cyg_uint8 ch;
    CYGARC_HAL_SAVE_GP();

    while(!cyg_hal_plf_screen_getc_nonblock(__ch_data, &ch));

    CYGARC_HAL_RESTORE_GP();

    return ch;
}



//=============================================================================
// Call IF support

#if defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG) \
    || defined(CYGPRI_HAL_IMPLEMENTS_IF_SERVICES)

static void
cyg_hal_plf_screen_write(void* __ch_data, const cyg_uint8* __buf, 
                         cyg_uint32 __len)
{
    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)
        cyg_hal_plf_screen_putc(__ch_data, *__buf++);

    CYGARC_HAL_RESTORE_GP();
}

static void
cyg_hal_plf_screen_read(void* __ch_data, cyg_uint8* __buf, cyg_uint32 __len)
{
    CYGARC_HAL_SAVE_GP();

    while(__len-- > 0)
        *__buf++ = cyg_hal_plf_screen_getc(__ch_data);

    CYGARC_HAL_RESTORE_GP();
}

cyg_bool
cyg_hal_plf_screen_getc_timeout(void* __ch_data, cyg_uint8* ch)
{
    int delay_count;
    channel_data_t* chan = (channel_data_t*)__ch_data;
    cyg_bool res;
    CYGARC_HAL_SAVE_GP();

    delay_count = chan->msec_timeout * 10; // delay in .1 ms steps

    for(;;) {
        res = cyg_hal_plf_screen_getc_nonblock(__ch_data, ch);
        if (res || 0 == delay_count--)
            break;
        
        CYGACC_CALL_IF_DELAY_US(100);
    }

    CYGARC_HAL_RESTORE_GP();
    return res;
}

static int
cyg_hal_plf_screen_control(void *__ch_data, __comm_control_cmd_t __func, ...)
{
    static int irq_state = 0;
    channel_data_t* chan = (channel_data_t*)__ch_data;
    int ret = 0;
    CYGARC_HAL_SAVE_GP();

    switch (__func) {
    case __COMMCTL_IRQ_ENABLE:
        irq_state = 1;

        HAL_INTERRUPT_UNMASK(chan->isr_vector);
        break;
    case __COMMCTL_IRQ_DISABLE:
        ret = irq_state;
        irq_state = 0;

        HAL_INTERRUPT_MASK(chan->isr_vector);
        break;
    case __COMMCTL_DBG_ISR_VECTOR:
        ret = chan->isr_vector;
        break;
    case __COMMCTL_SET_TIMEOUT:
    {
        va_list ap;

        va_start(ap, __func);

        ret = chan->msec_timeout;
        chan->msec_timeout = va_arg(ap, cyg_uint32);

        va_end(ap);
    }        
    default:
        break;
    }
    CYGARC_HAL_RESTORE_GP();
    return ret;
}

static int
cyg_hal_plf_screen_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;

    CYGARC_HAL_SAVE_GP();

    cyg_drv_interrupt_acknowledge(chan->isr_vector);

    *__ctrlc = 0;

    if ( KeyboardTest() ) {

        c = KBPending;
        KBPending = 0xFF;
        if( cyg_hal_is_break( &c , 1 ) )
            *__ctrlc = 1;

        res = CYG_ISR_HANDLED;
    }

    CYGARC_HAL_RESTORE_GP();
    return res;
}

void cyg_hal_plf_screen_init(void)
{
    hal_virtual_comm_table_t* comm;
    int cur = CYGACC_CALL_IF_SET_CONSOLE_COMM(CYGNUM_CALL_IF_SET_COMM_ID_QUERY_CURRENT);

    // Disable interrupts.
    HAL_INTERRUPT_MASK(pc_ser_channels[PCMB_PORT_INDEX].isr_vector);

    // Init channels
    cyg_hal_plf_screen_init_channel(&pc_ser_channels[PCMB_PORT_INDEX]);

    // Setup procs in the vector table

    // Set channel 2
    CYGACC_CALL_IF_SET_CONSOLE_COMM(PCMB_PORT_INDEX);
    comm = CYGACC_CALL_IF_CONSOLE_PROCS();
    CYGACC_COMM_IF_CH_DATA_SET(*comm, &pc_ser_channels[PCMB_PORT_INDEX]);
    CYGACC_COMM_IF_WRITE_SET(*comm, cyg_hal_plf_screen_write);
    CYGACC_COMM_IF_READ_SET(*comm, cyg_hal_plf_screen_read);
    CYGACC_COMM_IF_PUTC_SET(*comm, cyg_hal_plf_screen_putc);
    CYGACC_COMM_IF_GETC_SET(*comm, cyg_hal_plf_screen_getc);
    CYGACC_COMM_IF_CONTROL_SET(*comm, cyg_hal_plf_screen_control);
    CYGACC_COMM_IF_DBG_ISR_SET(*comm, cyg_hal_plf_screen_isr);
    CYGACC_COMM_IF_GETC_TIMEOUT_SET(*comm, cyg_hal_plf_screen_getc_timeout);

    // Restore original console
    CYGACC_CALL_IF_SET_CONSOLE_COMM(cur);
}

#endif //  defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
       // || defined(CYGPRI_HAL_IMPLEMENTS_IF_SERVICES)


// Return the position of the cursor. 
void cyg_hal_plf_screen_position(int *x, int *y)
{
    *x = XPos;
    *y = YPos;
}

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

#endif // CYGINT_HAL_I386_PCMB_SCREEN_SUPPORT

//-----------------------------------------------------------------------------
// End of pcmb_screen.c