ih_usart1_tx.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (C) 2001-2005 by egnite Software GmbH. All rights reserved.
00003  *
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions
00006  * are met:
00007  *
00008  * 1. Redistributions of source code must retain the above copyright
00009  *    notice, this list of conditions and the following disclaimer.
00010  * 2. Redistributions in binary form must reproduce the above copyright
00011  *    notice, this list of conditions and the following disclaimer in the
00012  *    documentation and/or other materials provided with the distribution.
00013  * 3. Neither the name of the copyright holders nor the names of
00014  *    contributors may be used to endorse or promote products derived
00015  *    from this software without specific prior written permission.
00016  *
00017  * THIS SOFTWARE IS PROVIDED BY EGNITE SOFTWARE GMBH AND CONTRIBUTORS
00018  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
00019  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
00020  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL EGNITE
00021  * SOFTWARE GMBH OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
00022  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
00024  * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00026  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
00028  * SUCH DAMAGE.
00029  *
00030  * For additional information see http://www.ethernut.de/
00031  *
00032  */
00033 
00083 #include <dev/irqreg.h>
00084 
00089 
00090 #if defined(SIG_UART1_TRANS) || defined(iv_USART1_TX) || defined(SIG_USART1_TRANS)
00091 
00092 static int AvrUart1TxIrqCtl(int cmd, void *param);
00093 
00094 IRQ_HANDLER sig_UART1_TRANS = {
00095 #ifdef NUT_PERFMON
00096     0,                          /* Interrupt counter, ir_count. */
00097 #endif
00098     NULL,                       /* Passed argument, ir_arg. */
00099     NULL,                       /* Handler subroutine, ir_handler. */
00100     AvrUart1TxIrqCtl            /* Interrupt control, ir_ctl. */
00101 };
00102 
00118 static int AvrUart1TxIrqCtl(int cmd, void *param)
00119 {
00120     int rc = 0;
00121     u_int *ival = (u_int *) param;
00122     int_fast8_t enabled = bit_is_set(UCSR1B, TXCIE1);
00123 
00124     /* Disable interrupt. */
00125     cbi(UCSR1B, TXCIE1);
00126 
00127     switch (cmd) {
00128     case NUT_IRQCTL_INIT:
00129         enabled = 0;
00130     case NUT_IRQCTL_CLEAR:
00131         /* Clear any pending interrupt. */
00132         sbi(UCSR1A, TXC1);
00133         break;
00134     case NUT_IRQCTL_STATUS:
00135         if (bit_is_set(UCSR1A, TXC1)) {
00136             *ival = 1;
00137         } else {
00138             *ival = 0;
00139         }
00140         if (enabled) {
00141             *ival |= 0x80;
00142         }
00143         break;
00144     case NUT_IRQCTL_ENABLE:
00145         enabled = 1;
00146         break;
00147     case NUT_IRQCTL_DISABLE:
00148         enabled = 0;
00149         break;
00150     case NUT_IRQCTL_GETPRIO:
00151         *ival = 16;
00152         break;
00153 #ifdef NUT_PERFMON
00154     case NUT_IRQCTL_GETCOUNT:
00155         *ival = (u_int) sig_UART1_TRANS.ir_count; 
00156         sig_UART1_TRANS.ir_count = 0;             
00157         break;
00158 #endif
00159     default:
00160         rc = -1;
00161         break;
00162     }
00163 
00164     /* Enable interrupt. */
00165     if (enabled) {
00166         sbi(UCSR1B, TXCIE1);
00167     }
00168     return rc;
00169 }
00170 
00174 #if defined(SIG_UART1_TRANS) || defined(iv_USART1_TX)
00175 #ifdef __IMAGECRAFT__
00176 #pragma interrupt_handler SIG_UART1_TRANS:iv_USART1_TX
00177 #endif
00178 NUTSIGNAL(SIG_UART1_TRANS, sig_UART1_TRANS)
00179 #elif defined(SIG_USART1_TRANS)
00180 NUTSIGNAL(SIG_USART1_TRANS, sig_UART1_TRANS)
00181 #endif
00182 
00183 #endif
00184 

© 2000-2007 by egnite Software GmbH - visit http://www.ethernut.de/