00001 /* 00002 * Copyright Droids Corporation, Microb Technology, Eirbot (2005) 00003 * 00004 * This program is free software; you can redistribute it and/or modify 00005 * it under the terms of the GNU General Public License as published by 00006 * the Free Software Foundation; either version 2 of the License, or 00007 * (at your option) any later version. 00008 * 00009 * This program is distributed in the hope that it will be useful, 00010 * but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 00012 * GNU General Public License for more details. 00013 * 00014 * You should have received a copy of the GNU General Public License 00015 * along with this program; if not, write to the Free Software 00016 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA 00017 * 00018 * Revision : $Id: uart_send9_nowait.c,v 1.2 2009-03-15 21:51:18 zer0 Exp $ 00019 * 00020 */ 00021 00022 /* Olivier MATZ, Droids-corp 2004 - 2009 */ 00023 00024 #include <uart.h> 00025 #include <uart_defs.h> 00026 #include <uart_private.h> 00027 00028 int uart_send_9bits_nowait(int c) 00029 { 00030 uint8_t flags; 00031 IRQ_LOCK(flags); 00032 00033 /* if tx intrp are disabled (RXCIE is 0) */ 00034 if ( !(*uart_regs[num].ucsrb & (1 << RXCIE )) ) { 00035 /* we have to poll the status register before xmit */ 00036 if (*uart_regs[num].ucsra & (1<<UDRE)) { 00037 uart_set_udr_9bits(c); 00038 IRQ_UNLOCK(flags); 00039 return c; 00040 } 00041 else { 00042 IRQ_UNLOCK(flags); 00043 return -1; 00044 } 00045 } 00046 00047 /* the fifo must have 2 free places */ 00048 if( CIRBUF_GET_FREELEN(&g_tx_fifo) < 2) { 00049 IRQ_UNLOCK(flags); 00050 return -1; 00051 } 00052 00053 /* uart is ready to send */ 00054 if (CIRBUF_IS_EMPTY(&g_tx_fifo[num]) && 00055 *uart_regs[num].ucsra & (1<<UDRE)) { 00056 uart_set_udr_9bits(c); 00057 sbi(*uart_regs[num].ucsrb, UDRIE); /* XXX */ 00058 } 00059 else { /* not ready, put char in fifo */ 00060 cirbuf_add_buf_head(&g_tx_fifo, (char *)&c, 2); 00061 } 00062 00063 IRQ_UNLOCK(flags); 00064 return (int)c; 00065 }
1.5.6