ih_usart1_tx.c

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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 
00087 #include <dev/irqreg.h>
00088 
00093 
00094 #if defined(SIG_UART1_TRANS) || defined(iv_USART1_TX) || defined(SIG_USART1_TRANS)
00095 
00096 static int AvrUart1TxIrqCtl(int cmd, void *param);
00097 
00098 IRQ_HANDLER sig_UART1_TRANS = {
00099 #ifdef NUT_PERFMON
00100     0,                          /* Interrupt counter, ir_count. */
00101 #endif
00102     NULL,                       /* Passed argument, ir_arg. */
00103     NULL,                       /* Handler subroutine, ir_handler. */
00104     AvrUart1TxIrqCtl            /* Interrupt control, ir_ctl. */
00105 };
00106 
00122 static int AvrUart1TxIrqCtl(int cmd, void *param)
00123 {
00124     int rc = 0;
00125     unsigned int *ival = (unsigned int *) param;
00126     int_fast8_t enabled = bit_is_set(UCSR1B, TXCIE1);
00127 
00128     /* Disable interrupt. */
00129     cbi(UCSR1B, TXCIE1);
00130 
00131     switch (cmd) {
00132     case NUT_IRQCTL_INIT:
00133         enabled = 0;
00134     case NUT_IRQCTL_CLEAR:
00135         /* Clear any pending interrupt. */
00136         sbi(UCSR1A, TXC1);
00137         break;
00138     case NUT_IRQCTL_STATUS:
00139         if (bit_is_set(UCSR1A, TXC1)) {
00140             *ival = 1;
00141         } else {
00142             *ival = 0;
00143         }
00144         if (enabled) {
00145             *ival |= 0x80;
00146         }
00147         break;
00148     case NUT_IRQCTL_ENABLE:
00149         enabled = 1;
00150         break;
00151     case NUT_IRQCTL_DISABLE:
00152         enabled = 0;
00153         break;
00154     case NUT_IRQCTL_GETPRIO:
00155         *ival = 16;
00156         break;
00157 #ifdef NUT_PERFMON
00158     case NUT_IRQCTL_GETCOUNT:
00159         *ival = (unsigned int) sig_UART1_TRANS.ir_count; 
00160         sig_UART1_TRANS.ir_count = 0;             
00161         break;
00162 #endif
00163     default:
00164         rc = -1;
00165         break;
00166     }
00167 
00168     /* Enable interrupt. */
00169     if (enabled) {
00170         sbi(UCSR1B, TXCIE1);
00171     }
00172     return rc;
00173 }
00174 
00178 #if defined(SIG_UART1_TRANS) || defined(iv_USART1_TX)
00179 #ifdef __IMAGECRAFT__
00180 #pragma interrupt_handler SIG_UART1_TRANS:iv_USART1_TX
00181 #endif
00182 NUTSIGNAL(SIG_UART1_TRANS, sig_UART1_TRANS)
00183 #elif defined(SIG_USART1_TRANS)
00184 NUTSIGNAL(SIG_USART1_TRANS, sig_UART1_TRANS)
00185 #endif
00186 
00187 #endif
00188 

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