ih_ovrit.c

Go to the documentation of this file.
00001 /*
00002  * Copyright (C) 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 
00067 #include <dev/irqreg.h>
00068 
00073 
00074 #if defined(SIG_CAN_OVERFLOW1) || defined(iv_CAN_TIM_OVR)
00075 
00076 static int AvrCanOvrIrqCtl(int cmd, void *param);
00077 
00078 IRQ_HANDLER sig_CAN_OVERRUN = {
00079 #ifdef NUT_PERFMON
00080     0,                          /* Interrupt counter, ir_count. */
00081 #endif
00082     NULL,                       /* Passed argument, ir_arg. */
00083     NULL,                       /* Handler subroutine, ir_handler. */
00084     AvrCanOvrIrqCtl             /* Interrupt control, ir_ctl. */
00085 };
00086 
00095 static int AvrCanOvrIrqCtl(int cmd, void *param)
00096 {
00097     int rc = 0;
00098     u_int *ival = (u_int *) param;
00099     int enabled = bit_is_set(CANGIE, ENOVRT);
00100 
00101     /* Disable interrupt. */
00102     cbi(CANGIE, ENOVRT);
00103 
00104     switch (cmd) {
00105     case NUT_IRQCTL_INIT:
00106     case NUT_IRQCTL_DISABLE:
00107         enabled = 0;
00108         break;
00109     case NUT_IRQCTL_ENABLE:
00110         enabled = 1;
00111         break;
00112     case NUT_IRQCTL_GETPRIO:
00113         *ival = 0;
00114         break;
00115 #ifdef NUT_PERFMON
00116     case NUT_IRQCTL_GETCOUNT:
00117         *ival = (u_int) SIG_CAN_OVERFLOW1.ir_count;
00118         SIG_CAN_OVERFLOW1.ir_count = 0;
00119         break;
00120 #endif
00121     default:
00122         rc = -1;
00123         break;
00124     }
00125 
00126     /* Enable interrupt. */
00127     if (enabled) {
00128         sbi(CANGIE, ENOVRT);
00129     }
00130     return rc;
00131 }
00132 
00136 #ifdef __IMAGECRAFT__
00137 #pragma interrupt_handler SIG_CAN_OVERFLOW1:iv_CAN_TIM_OVR
00138 #endif
00139 NUTSIGNAL(SIG_CAN_OVERFLOW1, sig_CAN_OVERRUN)
00140 #endif
00141 

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