ih_timer2_ovf.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 
00073 #include <dev/irqreg.h>
00074 
00079 
00080 static int AvrTimer2OvfIrqCtl(int cmd, void *param);
00081 
00082 IRQ_HANDLER sig_OVERFLOW2 = {
00083 #ifdef NUT_PERFMON
00084     0,                          /* Interrupt counter, ir_count. */
00085 #endif
00086     NULL,                       /* Passed argument, ir_arg. */
00087     NULL,                       /* Handler subroutine, ir_handler. */
00088     AvrTimer2OvfIrqCtl          /* Interrupt control, ir_ctl. */
00089 };
00090 
00106 static int AvrTimer2OvfIrqCtl(int cmd, void *param)
00107 {
00108     int rc = 0;
00109     u_int *ival = (u_int *) param;
00110     int_fast8_t enabled = bit_is_set(TIMSK, TOIE2);
00111 
00112     /* Disable interrupt. */
00113     cbi(TIMSK, TOIE2);
00114 
00115     switch (cmd) {
00116     case NUT_IRQCTL_INIT:
00117         enabled = 0;
00118     case NUT_IRQCTL_CLEAR:
00119         /* Clear any pending interrupt. */
00120         outb(TIFR, _BV(TOV2));
00121         break;
00122     case NUT_IRQCTL_STATUS:
00123         if (bit_is_set(TIFR, TOV2)) {
00124             *ival = 1;
00125         } else {
00126             *ival = 0;
00127         }
00128         if (enabled) {
00129             *ival |= 0x80;
00130         }
00131         break;
00132     case NUT_IRQCTL_ENABLE:
00133         enabled = 1;
00134         break;
00135     case NUT_IRQCTL_DISABLE:
00136         enabled = 0;
00137         break;
00138     case NUT_IRQCTL_GETPRIO:
00139         *ival = 9;
00140         break;
00141 #ifdef NUT_PERFMON
00142     case NUT_IRQCTL_GETCOUNT:
00143         *ival = (u_int) sig_OVERFLOW2.ir_count;
00144         sig_OVERFLOW2.ir_count = 0;
00145         break;
00146 #endif
00147     default:
00148         rc = -1;
00149         break;
00150     }
00151 
00152     /* Enable interrupt. */
00153     if (enabled) {
00154         sbi(TIMSK, TOIE2);
00155     }
00156     return rc;
00157 }
00158 
00162 #ifdef __IMAGECRAFT__
00163 #pragma interrupt_handler SIG_OVERFLOW2:iv_TIMER2_OVF
00164 #endif
00165 NUTSIGNAL(SIG_OVERFLOW2, sig_OVERFLOW2)
00166 
00167 

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