ih_canit.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,
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 
00070 #include <dev/irqreg.h>
00071 
00076 
00077 #if defined(SIG_CAN_INTERRUPT1) || defined(iv_CAN_TRANSFER)
00078 
00079 static int AvrCanTxIrqCtl(int cmd, void *param);
00080 
00081 IRQ_HANDLER sig_CAN_TRANSFER = {
00082 #ifdef NUT_PERFMON
00083     0,                          /* Interrupt counter, ir_count. */
00084 #endif
00085     NULL,                       /* Passed argument, ir_arg. */
00086     NULL,                       /* Handler subroutine, ir_handler. */
00087     AvrCanTxIrqCtl              /* Interrupt control, ir_ctl. */
00088 };
00089 
00098 static int AvrCanTxIrqCtl(int cmd, void *param)
00099 {
00100     int rc = 0;
00101     u_int *ival = (u_int *) param;
00102     int_fast8_t enabled = bit_is_set(CANGIE, ENIT);
00103 
00104     /* Disable interrupt. */
00105     cbi(CANGIE, ENIT);
00106 
00107     switch (cmd) {
00108     case NUT_IRQCTL_INIT:
00109     case NUT_IRQCTL_DISABLE:
00110         enabled = 0;
00111         break;
00112     case NUT_IRQCTL_ENABLE:
00113         enabled = 1;
00114         break;
00115     case NUT_IRQCTL_GETPRIO:
00116         *ival = 0;
00117         break;
00118 #ifdef NUT_PERFMON
00119     case NUT_IRQCTL_GETCOUNT:
00120         *ival = (u_int) sig_CAN_TRANSFER.ir_count;
00121         sig_CAN_TRANSFER.ir_count = 0;
00122         break;
00123 #endif
00124     default:
00125         rc = -1;
00126         break;
00127     }
00128 
00129     /* Enable interrupt. */
00130     if (enabled) {
00131         sbi(CANGIE, ENIT);
00132     }
00133     return rc;
00134 }
00135 
00139 #ifdef __IMAGECRAFT__
00140 #pragma interrupt_handler SIG_CAN_INTERRUPT1:iv_CAN_TRANSFER
00141 #endif
00142 NUTSIGNAL(SIG_CAN_INTERRUPT1, sig_CAN_TRANSFER)
00143 #endif
00144 

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