ih_adc.c

Go to the documentation of this file.
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 
00076 #include <dev/irqreg.h>
00077 
00082 
00083 static int AvrAdcIrqCtl(int cmd, void *param);
00084 
00085 IRQ_HANDLER sig_ADC = {
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     AvrAdcIrqCtl                /* Interrupt control, ir_ctl. */
00092 };
00093 
00109 static int AvrAdcIrqCtl(int cmd, void *param)
00110 {
00111     int rc = 0;
00112     u_int *ival = (u_int *) param;
00113     int_fast8_t enabled = bit_is_set(ADCSR, ADIE);
00114 
00115     /* Disable interrupt. */
00116     cbi(ADCSR, ADIE);
00117 
00118     switch (cmd) {
00119     case NUT_IRQCTL_INIT:
00120         enabled = 0;
00121     case NUT_IRQCTL_CLEAR:
00122         /* Clear any pending interrupt. */
00123         outb(ADCSR, _BV(ADIF));
00124         break;
00125     case NUT_IRQCTL_STATUS:
00126         if (bit_is_set(ADCSR, ADIF)) {
00127             *ival = 1;
00128         } else {
00129             *ival = 0;
00130         }
00131         if (enabled) {
00132             *ival |= 0x80;
00133         }
00134         break;
00135     case NUT_IRQCTL_ENABLE:
00136         enabled = 1;
00137         break;
00138     case NUT_IRQCTL_DISABLE:
00139         enabled = 0;
00140         break;
00141     case NUT_IRQCTL_GETPRIO:
00142         *ival = 0;
00143         break;
00144 #ifdef NUT_PERFMON
00145     case NUT_IRQCTL_GETCOUNT:
00146         *ival = (u_int) sig_ADC.ir_count;
00147         sig_ADC.ir_count = 0;
00148         break;
00149 #endif
00150     default:
00151         rc = -1;
00152         break;
00153     }
00154 
00155     /* Enable interrupt. */
00156     if (enabled) {
00157         sbi(ADCSR, ADIE);
00158     }
00159     return rc;
00160 }
00161 
00165 #ifdef __IMAGECRAFT__
00166 #pragma interrupt_handler SIG_ADC:iv_ADC
00167 #endif
00168 NUTSIGNAL(SIG_ADC, sig_ADC)
00169 
00170 

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