C++ (Cpp) SCxSR_TDxE_CLEAR Examples

Example #1

File: sh-sci.c Project: BackupTheBerlios/tuxap

/* Write a char */
static void kgdb_put_char(struct sci_port *port, char c)
{
        unsigned short status;

        do
                status = sci_in(port, SCxSR);
        while (!(status & SCxSR_TDxE(port)));

        sci_out(port, SCxTDR, c);
        sci_in(port, SCxSR);    /* Dummy read */
        sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
}

Example #2

static void put_char(struct uart_port *port, char c)
{
	unsigned long flags;
	unsigned short status;

	spin_lock_irqsave(&port->lock, flags);

	do {
		status = sci_in(port, SCxSR);
	} while (!(status & SCxSR_TDxE(port)));

	sci_out(port, SCxTDR, c);
	sci_in(port, SCxSR);            /* Dummy read */
	sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));

	spin_unlock_irqrestore(&port->lock, flags);
}

Example #3

File: sh-sci.c Project: nhanh0/hah

static void put_char(struct sci_port *port, char c)
{
	unsigned long flags;
	unsigned short status;

	save_and_cli(flags);

	do
		status = sci_in(port, SCxSR);
	while (!(status & SCxSR_TDxE(port)));
	
	sci_out(port, SCxTDR, c);
	sci_in(port, SCxSR);            /* Dummy read */
	sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));

	restore_flags(flags);
}

Example #4

static void sci_transmit_chars(struct uart_port *port)
{
	struct circ_buf *xmit = &port->info->xmit;
	unsigned int stopped = uart_tx_stopped(port);
	unsigned short status;
	unsigned short ctrl;
	int count;

	status = sci_in(port, SCxSR);
	if (!(status & SCxSR_TDxE(port))) {
		ctrl = sci_in(port, SCSCR);
		if (uart_circ_empty(xmit)) {
			ctrl &= ~SCI_CTRL_FLAGS_TIE;
		} else {
			ctrl |= SCI_CTRL_FLAGS_TIE;
		}
		sci_out(port, SCSCR, ctrl);
		return;
	}

	if (port->type == PORT_SCIF)
		count = scif_txroom(port);
	else
		count = sci_txroom(port);

	do {
		unsigned char c;

		if (port->x_char) {
			c = port->x_char;
			port->x_char = 0;
		} else if (!uart_circ_empty(xmit) && !stopped) {
			c = xmit->buf[xmit->tail];
			xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);
		} else {
			break;
		}

		sci_out(port, SCxTDR, c);

		port->icount.tx++;
	} while (--count > 0);

	sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(port);
	if (uart_circ_empty(xmit)) {
		sci_stop_tx(port);
	} else {
		ctrl = sci_in(port, SCSCR);

		if (port->type == PORT_SCIF) {
			sci_in(port, SCxSR); /* Dummy read */
			sci_out(port, SCxSR, SCxSR_TDxE_CLEAR(port));
		}

		ctrl |= SCI_CTRL_FLAGS_TIE;
		sci_out(port, SCSCR, ctrl);
	}
}