2 * Copyright Droids Corporation, Microb Technology, Eirbot (2005)
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 * Revision : $Id: uart_send_nowait.c,v 1.1.2.2 2008-12-27 16:50:01 zer0 Exp $
22 /* Olivier MATZ, Droids-corp 2004 - 2009 */
25 #include <uart_defs.h>
26 #include <uart_private.h>
29 /* send a char, or put it in the fifo if uart is not ready. Return -1
31 int uart_send_nowait(uint8_t num, char c)
37 /* if uart intrp mode is disabled (note that we look rx */
38 /* intrp -- RXCIE is 0) */
39 if ( !(*uart_regs[num].ucsrb & (1 << RXCIE )) ) {
40 /* we have to poll the status register before xmit */
41 if (*uart_regs[num].ucsra & (1<<UDRE)) {
52 if (CIRBUF_IS_FULL(&g_tx_fifo[num])) {
57 /* uart is ready to send */
58 if (CIRBUF_IS_EMPTY(&g_tx_fifo[num]) &&
59 *uart_regs[num].ucsra & (1<<UDRE)) {
61 sbi(*uart_regs[num].ucsrb, UDRIE); /* XXX */
63 else { /* not ready, put char in fifo */
64 cirbuf_add_head(&g_tx_fifo[num], c);