ih_ovrit.c

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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,
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00023  * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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00025  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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00027  * THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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00032  */
00033 
00074 #include <dev/irqreg.h>
00075 
00080 
00081 #if defined(SIG_CAN_OVERFLOW1) || defined(iv_CAN_TIM_OVR)
00082 
00083 static int AvrCanOvrIrqCtl(int cmd, void *param);
00084 
00085 IRQ_HANDLER sig_CAN_OVERRUN = {
00086 #ifdef NUT_PERFMON
00087     0,                          /* Interrupt counter, ir_count. */
00088 #endif
00089     NULL,                       /* Passed argument, ir_arg. */
00090     NULL,                       /* Handler subroutine, ir_handler. */
00091     AvrCanOvrIrqCtl             /* Interrupt control, ir_ctl. */
00092 };
00093 
00102 static int AvrCanOvrIrqCtl(int cmd, void *param)
00103 {
00104     int rc = 0;
00105     unsigned int *ival = (unsigned int *) param;
00106     int_fast8_t enabled = bit_is_set(CANGIE, ENOVRT);
00107 
00108     /* Disable interrupt. */
00109     cbi(CANGIE, ENOVRT);
00110 
00111     switch (cmd) {
00112     case NUT_IRQCTL_INIT:
00113     case NUT_IRQCTL_DISABLE:
00114         enabled = 0;
00115         break;
00116     case NUT_IRQCTL_ENABLE:
00117         enabled = 1;
00118         break;
00119     case NUT_IRQCTL_GETPRIO:
00120         *ival = 0;
00121         break;
00122 #ifdef NUT_PERFMON
00123     case NUT_IRQCTL_GETCOUNT:
00124         *ival = (unsigned int) SIG_CAN_OVERFLOW1.ir_count;
00125         SIG_CAN_OVERFLOW1.ir_count = 0;
00126         break;
00127 #endif
00128     default:
00129         rc = -1;
00130         break;
00131     }
00132 
00133     /* Enable interrupt. */
00134     if (enabled) {
00135         sbi(CANGIE, ENOVRT);
00136     }
00137     return rc;
00138 }
00139 
00143 #ifdef __IMAGECRAFT__
00144 #pragma interrupt_handler SIG_CAN_OVERFLOW1:iv_CAN_TIM_OVR
00145 #endif
00146 NUTSIGNAL(SIG_CAN_OVERFLOW1, sig_CAN_OVERRUN)
00147 #endif
00148 

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