edb7xxx_serial.c

来自「开放源码实时操作系统源码.」· C语言 代码 · 共 410 行 · 第 1/2 页

    unsigned int baud_divisor = select_baud[new_config->baud];
    cyg_uint32 _lcr;
    if (baud_divisor == 0) return false;
    // Disable port interrupts while changing hardware
    _lcr = select_word_length[new_config->word_length - CYGNUM_SERIAL_WORD_LENGTH_5] | 
        select_stop_bits[new_config->stop] |
        select_parity[new_config->parity] |
        UBLCR_FIFOEN | UART_BITRATE(baud_divisor);
#ifdef CYGDBG_IO_INIT
    diag_printf("Set CTL: %x = %x\n", blcfg, _lcr);
#endif
    *blcfg = _lcr;
    *syscon |= SYSCON1_UART1EN;
    if (new_config != &chan->config) {
        chan->config = *new_config;
    }
    return true;
}

// Function to initialize the device.  Called at bootstrap time.
static bool 
edb7xxx_serial_init(struct cyg_devtab_entry *tab)
{
    serial_channel *chan = (serial_channel *)tab->priv;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
#ifdef CYGDBG_IO_INIT
    diag_printf("EDB7XXX SERIAL init - dev: %x.%d\n", edb7xxx_chan->control, edb7xxx_chan->tx_int_num);
#endif
    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices
    if (chan->out_cbuf.len != 0) {
        cyg_drv_interrupt_create(edb7xxx_chan->tx_int_num,
                                 99,                     // Priority - unused
                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler
                                 edb7xxx_serial_tx_ISR,
                                 edb7xxx_serial_tx_DSR,
                                 &edb7xxx_chan->serial_tx_interrupt_handle,
                                 &edb7xxx_chan->serial_tx_interrupt);
        cyg_drv_interrupt_attach(edb7xxx_chan->serial_tx_interrupt_handle);
        cyg_drv_interrupt_mask(edb7xxx_chan->tx_int_num);
        edb7xxx_chan->tx_enabled = false;
    }
    if (chan->in_cbuf.len != 0) {
        cyg_drv_interrupt_create(edb7xxx_chan->rx_int_num,
                                 99,                     // Priority - unused
                                 (cyg_addrword_t)chan,   //  Data item passed to interrupt handler
                                 edb7xxx_serial_rx_ISR,
                                 edb7xxx_serial_rx_DSR,
                                 &edb7xxx_chan->serial_rx_interrupt_handle,
                                 &edb7xxx_chan->serial_rx_interrupt);
        cyg_drv_interrupt_attach(edb7xxx_chan->serial_rx_interrupt_handle);
        cyg_drv_interrupt_unmask(edb7xxx_chan->rx_int_num);
    }
    edb7xxx_serial_config_port(chan, &chan->config, true);
    return true;
}

// This routine is called when the device is "looked" up (i.e. attached)
static Cyg_ErrNo 
edb7xxx_serial_lookup(struct cyg_devtab_entry **tab, 
                  struct cyg_devtab_entry *sub_tab,
                  const char *name)
{
    serial_channel *chan = (serial_channel *)(*tab)->priv;
    (chan->callbacks->serial_init)(chan);  // Really only required for interrupt driven devices
    return ENOERR;
}

// Send a character to the device output buffer.
// Return 'true' if character is sent to device
static bool
edb7xxx_serial_putc(serial_channel *chan, unsigned char c)
{
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    volatile cyg_uint8  *data = (volatile cyg_uint8  *)edb7xxx_chan->data;
    volatile cyg_uint32 *stat = (volatile cyg_uint32 *)edb7xxx_chan->stat;
    if ((*stat & SYSFLG1_UTXFF1) == 0) {
// Transmit buffer/FIFO is not full
        *data = c;
        return true;
    } else {
// No space
        return false;
    }
}

// Fetch a character from the device input buffer, waiting if necessary
static unsigned char 
edb7xxx_serial_getc(serial_channel *chan)
{
    unsigned char c;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    volatile cyg_uint32 *data = (volatile cyg_uint32 *)edb7xxx_chan->data;
    volatile cyg_uint32 *stat = (volatile cyg_uint32 *)edb7xxx_chan->stat;
    while (*stat & SYSFLG1_URXFE1) ; // Wait for char
    c = *data;
    return c;
}

// Set up the device characteristics; baud rate, etc.
static Cyg_ErrNo
edb7xxx_serial_set_config(serial_channel *chan, cyg_uint32 key,
                          const void *xbuf, cyg_uint32 *len)
{
    switch (key) {
    case CYG_IO_SET_CONFIG_SERIAL_INFO:
      {
        cyg_serial_info_t *config = (cyg_serial_info_t *)xbuf;
        if ( *len < sizeof(cyg_serial_info_t) ) {
            return -EINVAL;
        }
        *len = sizeof(cyg_serial_info_t);
        if ( true != edb7xxx_serial_config_port(chan, config, false) )
            return -EINVAL;
      }
      break;
    default:
        return -EINVAL;
    }
    return ENOERR;
}

// Enable the transmitter (interrupt) on the device
static void
edb7xxx_serial_start_xmit(serial_channel *chan)
{
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    edb7xxx_chan->tx_enabled = true;
    cyg_drv_interrupt_unmask(edb7xxx_chan->tx_int_num);
}

// Disable the transmitter on the device
static void 
edb7xxx_serial_stop_xmit(serial_channel *chan)
{
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(edb7xxx_chan->tx_int_num);
    edb7xxx_chan->tx_enabled = false;
}

// Serial I/O - low level Tx interrupt handler (ISR)
static cyg_uint32 
edb7xxx_serial_tx_ISR(cyg_vector_t vector, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(edb7xxx_chan->tx_int_num);
    cyg_drv_interrupt_acknowledge(edb7xxx_chan->tx_int_num);
    return CYG_ISR_CALL_DSR;  // Cause DSR to be run
}

// Serial I/O - high level Tx interrupt handler (DSR)
static void       
edb7xxx_serial_tx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    (chan->callbacks->xmt_char)(chan);
    if (edb7xxx_chan->tx_enabled) {
        cyg_drv_interrupt_unmask(edb7xxx_chan->tx_int_num);
    }
}

// Serial I/O - low level Rx interrupt handler (ISR)
static cyg_uint32 
edb7xxx_serial_rx_ISR(cyg_vector_t vector, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(edb7xxx_chan->rx_int_num);
    cyg_drv_interrupt_acknowledge(edb7xxx_chan->rx_int_num);
    return CYG_ISR_CALL_DSR;  // Cause DSR to be run
}

// Serial I/O - high level Rx interrupt handler (DSR)
static void       
edb7xxx_serial_rx_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    volatile cyg_uint32 *datreg = (volatile cyg_uint32 *)edb7xxx_chan->data;
    volatile cyg_uint32 *stat = (volatile cyg_uint32 *)edb7xxx_chan->stat;
    while (!(*stat & SYSFLG1_URXFE1))
        (chan->callbacks->rcv_char)(chan, *datreg);
    cyg_drv_interrupt_unmask(edb7xxx_chan->rx_int_num);
}

// Serial I/O - low level Ms interrupt handler (ISR)
static cyg_uint32 
edb7xxx_serial_ms_ISR(cyg_vector_t vector, cyg_addrword_t data)
{
    serial_channel *chan = (serial_channel *)data;
    edb7xxx_serial_info *edb7xxx_chan = (edb7xxx_serial_info *)chan->dev_priv;
    cyg_drv_interrupt_mask(edb7xxx_chan->ms_int_num);
    cyg_drv_interrupt_acknowledge(edb7xxx_chan->ms_int_num);
    return CYG_ISR_CALL_DSR;  // Cause DSR to be run
}

// Serial I/O - high level Ms interrupt handler (DSR)
static void       
edb7xxx_serial_ms_DSR(cyg_vector_t vector, cyg_ucount32 count, cyg_addrword_t data)
{
}
#endif // CYGPKG_IO_SERIAL_ARM_EDB7XXX