C++ (Cpp) serial_hsu_stop_tx示例

示例#1

static void transmit_chars(struct uart_hsu_port *up)
{
	struct circ_buf *xmit = &up->port.state->xmit;
	int count;

	if (up->port.x_char) {
		serial_out(up, UART_TX, up->port.x_char);
		up->port.icount.tx++;
		up->port.x_char = 0;
		return;
	}
	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
		serial_hsu_stop_tx(&up->port);
		return;
	}

	/* The IRQ is for TX FIFO half-empty */
	count = up->port.fifosize / 2;

	do {
		serial_out(up, UART_TX, xmit->buf[xmit->tail]);
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);

		up->port.icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (--count > 0);

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&up->port);

	if (uart_circ_empty(xmit))
		serial_hsu_stop_tx(&up->port);
}

示例#2

文件： mfd.c 项目： ANFS/ANFS-kernel

static void transmit_chars(struct uart_hsu_port *up)
{
	struct circ_buf *xmit = &up->port.state->xmit;
	int count;

	if (up->port.x_char) {
		serial_out(up, UART_TX, up->port.x_char);
		up->port.icount.tx++;
		up->port.x_char = 0;
		return;
	}
	if (uart_circ_empty(xmit) || uart_tx_stopped(&up->port)) {
		serial_hsu_stop_tx(&up->port);
		return;
	}

#ifndef MFD_HSU_A0_STEPPING
	count = up->port.fifosize / 2;
#else
	/*
	 * A0 only supports fully empty IRQ, and the first char written
	 * into it won't clear the EMPT bit, so we may need be cautious
	 * by useing a shorter buffer
	 */
	count = up->port.fifosize - 4;
#endif
	do {
		serial_out(up, UART_TX, xmit->buf[xmit->tail]);
		xmit->tail = (xmit->tail + 1) & (UART_XMIT_SIZE - 1);

		up->port.icount.tx++;
		if (uart_circ_empty(xmit))
			break;
	} while (--count > 0);

	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
		uart_write_wakeup(&up->port);

	if (uart_circ_empty(xmit))
		serial_hsu_stop_tx(&up->port);
}