ser16c550c.c

开放源码实时操作系统源码.

static cyg_bool
cyg_hal_plf_serial_getc_nonblock(void* __ch_data, cyg_uint8* ch)
{
    cyg_uint8* port;
    cyg_uint8 _lsr;

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

    port = ((channel_data_t*)__ch_data)->base;

    HAL_READ_UINT8(port+SER_16550_LSR, _lsr);
    if ((_lsr & SIO_LSR_DR) == 0)
        return false;

    HAL_READ_UINT8(port+SER_16550_RBR, *ch);

    return true;
}

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

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

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

    CYGARC_HAL_RESTORE_GP();
    return ch;
}

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

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

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

    CYGARC_HAL_RESTORE_GP();
}

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

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

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

    CYGARC_HAL_RESTORE_GP();
}


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

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

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

    for(;;) {
        res = cyg_hal_plf_serial_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_serial_control(void *__ch_data, __comm_control_cmd_t __func, ...)
{
    static int irq_state = 0;
    channel_data_t* chan;
    cyg_uint8 ier;
    int ret = 0;
    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

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

        HAL_READ_UINT8(chan->base + SER_16550_IER, ier);
        ier |= SIO_IER_ERDAI;
        HAL_WRITE_UINT8(chan->base + SER_16550_IER, ier);

        HAL_INTERRUPT_SET_LEVEL(chan->isr_vector, 1);
        HAL_INTERRUPT_UNMASK(chan->isr_vector);
        break;
    case __COMMCTL_IRQ_DISABLE:
        ret = irq_state;
        irq_state = 0;

        HAL_READ_UINT8(chan->base + SER_16550_IER, ier);
        ier &= ~SIO_IER_ERDAI;
        HAL_WRITE_UINT8(chan->base + SER_16550_IER, ier);

        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);
    }        
    break;
    case __COMMCTL_SETBAUD:
    {
        cyg_uint32 baud_rate;
        cyg_uint16 baud_divisor;
        cyg_uint8* port = chan->base;
        va_list ap;

        va_start(ap, __func);
        baud_rate = va_arg(ap, cyg_uint32);
        va_end(ap);

        switch (baud_rate)
        {
        case 110:    baud_divisor = BAUD_110;    break;
        case 150:    baud_divisor = BAUD_150;    break;
        case 300:    baud_divisor = BAUD_300;    break;
        case 600:    baud_divisor = BAUD_600;    break;
        case 1200:   baud_divisor = BAUD_1200;   break;
        case 2400:   baud_divisor = BAUD_2400;   break;
        case 4800:   baud_divisor = BAUD_4800;   break;
        case 7200:   baud_divisor = BAUD_7200;   break;
        case 9600:   baud_divisor = BAUD_9600;   break;
        case 14400:  baud_divisor = BAUD_14400;  break;
        case 19200:  baud_divisor = BAUD_19200;  break;
        case 38400:  baud_divisor = BAUD_38400;  break;
        case 57600:  baud_divisor = BAUD_57600;  break;
        case 115200: baud_divisor = BAUD_115200; break;
        case 230400: baud_divisor = BAUD_230400; break;
        default:     return -1;                  break; // Invalid baud rate selected
        }

        //
        // We may need to increase the timeout before causing a break reset.
        // According to the Atlas Users Manual (Document MD00005) The BRKRES
        // register will need to be programmed with a value larger that 0xA (the default)
        // if we are going to use a baud rate lower than 2400.
        //
        if (baud_rate <= 2400)
        {
            // For now, just disable the break reset entirely.
            HAL_WRITE_UINT32(HAL_ATLAS_BRKRES, 0);
        } else {
            // Put the break reset state back to the default
            HAL_WRITE_UINT32(HAL_ATLAS_BRKRES, HAL_ATLAS_BRKRES_DEFAULT_VALUE);
        }

        // Disable port interrupts while changing hardware
        HAL_READ_UINT8(port+SER_16550_IER, ier);
        HAL_WRITE_UINT8(port+SER_16550_IER, 0);

        // Set baud rate.
        cyg_hal_plf_serial_set_baud(port, baud_divisor);

        // Reenable interrupts if necessary
        HAL_WRITE_UINT8(port+SER_16550_IER, ier);
    }
    break;

    case __COMMCTL_GETBAUD:
        break;
    default:
        break;
    }
    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;
    cyg_uint8 _iir, c;
    channel_data_t* chan;
    CYGARC_HAL_SAVE_GP();

    // Some of the diagnostic print code calls through here with no idea what the ch_data is.
    // Go ahead and assume it is channels[0].
    if (__ch_data == 0)
      __ch_data = (void*)&channels[0];

    chan = (channel_data_t*)__ch_data;

    HAL_INTERRUPT_ACKNOWLEDGE(chan->isr_vector);

    HAL_READ_UINT8(chan->base + SER_16550_IIR, _iir);
    _iir &= SIO_IIR_ID_MASK;

    *__ctrlc = 0;
    if ((_iir == ISR_Rx_Avail) || (_iir == ISR_Rx_Char_Timeout)) {

        HAL_READ_UINT8(chan->base + SER_16550_RBR, c);
    
        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);

    // Disable interrupts.
    HAL_INTERRUPT_MASK(channels[0].isr_vector);

    // Init channels
    cyg_hal_plf_serial_init_channel((void*)&channels[0]);
    
    // Setup procs in the vector table

    // Set channel 0
    CYGACC_CALL_IF_SET_CONSOLE_COMM(0);
    comm = CYGACC_CALL_IF_CONSOLE_PROCS();
    CYGACC_COMM_IF_CH_DATA_SET(*comm, &channels[0]);
    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();
}

//-----------------------------------------------------------------------------
// end of ser16c550c.c