ih_usart0_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 
00083 #include <dev/irqreg.h>
00084 
00089 
00090 static int AvrUart0TxIrqCtl(int cmd, void *param);
00091 
00092 IRQ_HANDLER sig_UART0_TRANS = {
00093 #ifdef NUT_PERFMON
00094     0,                          /* Interrupt counter, ir_count. */
00095 #endif
00096     NULL,                       /* Passed argument, ir_arg. */
00097     NULL,                       /* Handler subroutine, ir_handler. */
00098     AvrUart0TxIrqCtl            /* Interrupt control, ir_ctl. */
00099 };
00100 
00116 static int AvrUart0TxIrqCtl(int cmd, void *param)
00117 {
00118     int rc = 0;
00119     u_int *ival = (u_int *) param;
00120     int enabled = bit_is_set(UCR, TXCIE);
00121 
00122     /* Disable interrupt. */
00123     cbi(UCR, TXCIE);
00124 
00125     switch (cmd) {
00126     case NUT_IRQCTL_INIT:
00127         enabled = 0;
00128     case NUT_IRQCTL_CLEAR:
00129         /* Clear any pending interrupt. */
00130         sbi(USR, TXC);
00131         break;
00132     case NUT_IRQCTL_STATUS:
00133         if (bit_is_set(USR, TXC)) {
00134             *ival = 1;
00135         } else {
00136             *ival = 0;
00137         }
00138         if (enabled) {
00139             *ival |= 0x80;
00140         }
00141         break;
00142     case NUT_IRQCTL_ENABLE:
00143         enabled = 1;
00144         break;
00145     case NUT_IRQCTL_DISABLE:
00146         enabled = 0;
00147         break;
00148     case NUT_IRQCTL_GETPRIO:
00149         *ival = 16;
00150         break;
00151 #ifdef NUT_PERFMON
00152     case NUT_IRQCTL_GETCOUNT:
00153         *ival = (u_int) sig_UART0_TRANS.ir_count;
00154         sig_UART0_TRANS.ir_count = 0;            
00155         break;
00156 #endif
00157     default:
00158         rc = -1;
00159         break;
00160     }
00161 
00162     /* Enable interrupt. */
00163     if (enabled) {
00164         sbi(UCR, TXCIE);
00165     }
00166     return rc;
00167 }
00168 
00169 #if defined(SIG_UART0_TRANS) || defined(iv_USART0_TX)
00170 
00174 #ifdef __IMAGECRAFT__
00175 #pragma interrupt_handler SIG_UART0_TRANS:iv_USART0_TX
00176 #endif
00177 NUTSIGNAL(SIG_UART0_TRANS, sig_UART0_TRANS)
00178 #elif defined(SIG_USART0_TRANS)
00179 
00180 NUTSIGNAL(SIG_USART0_TRANS, sig_UART0_TRANS)
00181 
00182 #else
00183 
00187 #ifdef __IMAGECRAFT__
00188 #pragma interrupt_handler SIG_UART_TRANS:iv_UART_TX
00189 #endif
00190 NUTSIGNAL(SIG_UART_TRANS, sig_UART0_TRANS)
00191 #endif
00192 

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