ih_timer1_compa.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 
00070 #include <dev/irqreg.h>
00071 
00076 
00077 static int AvrTimer1CompAIrqCtl(int cmd, void *param);
00078 
00079 IRQ_HANDLER sig_OUTPUT_COMPARE1A = {
00080 #ifdef NUT_PERFMON
00081     0,                          /* Interrupt counter, ir_count. */
00082 #endif
00083     NULL,                       /* Passed argument, ir_arg. */
00084     NULL,                       /* Handler subroutine, ir_handler. */
00085     AvrTimer1CompAIrqCtl        /* Interrupt control, ir_ctl. */
00086 };
00087 
00103 static int AvrTimer1CompAIrqCtl(int cmd, void *param)
00104 {
00105     int rc = 0;
00106     u_int *ival = (u_int *) param;
00107     int enabled = bit_is_set(TIMSK, OCIE1A);
00108 
00109     /* Disable interrupt. */
00110     cbi(TIMSK, OCIE1A);
00111 
00112     switch (cmd) {
00113     case NUT_IRQCTL_INIT:
00114         enabled = 0;
00115     case NUT_IRQCTL_CLEAR:
00116         /* Clear any pending interrupt. */
00117         outb(TIFR, _BV(OCF1A));
00118         break;
00119     case NUT_IRQCTL_STATUS:
00120         if (bit_is_set(TIFR, OCF1A)) {
00121             *ival = 1;
00122         } else {
00123             *ival = 0;
00124         }
00125         if (enabled) {
00126             *ival |= 0x80;
00127         }
00128         break;
00129     case NUT_IRQCTL_ENABLE:
00130         enabled = 1;
00131         break;
00132     case NUT_IRQCTL_DISABLE:
00133         enabled = 0;
00134         break;
00135     case NUT_IRQCTL_GETPRIO:
00136         *ival = 11;
00137         break;
00138 #ifdef NUT_PERFMON
00139     case NUT_IRQCTL_GETCOUNT:
00140         *ival = (u_int) sig_OUTPUT_COMPARE1A.ir_count;
00141         sig_OUTPUT_COMPARE1A.ir_count = 0;
00142         break;
00143 #endif
00144     default:
00145         rc = -1;
00146         break;
00147     }
00148 
00149     /* Enable interrupt. */
00150     if (enabled) {
00151         sbi(TIMSK, OCIE1A);
00152     }
00153     return rc;
00154 }
00155 
00159 #ifdef __IMAGECRAFT__
00160 #pragma interrupt_handler SIG_OUTPUT_COMPARE1A:iv_TIMER1_COMPA
00161 #endif
00162 NUTSIGNAL(SIG_OUTPUT_COMPARE1A, sig_OUTPUT_COMPARE1A)
00163 
00164 
00165 

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