ih_spi_stc.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 AvrSpiIrqCtl(int cmd, void *param);
00078 
00079 IRQ_HANDLER sig_SPI = {
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     AvrSpiIrqCtl                /* Interrupt control, ir_ctl. */
00086 };
00087 
00103 static int AvrSpiIrqCtl(int cmd, void *param)
00104 {
00105     int rc = 0;
00106     u_int *ival = (u_int *) param;
00107     int enabled = bit_is_set(SPCR, SPIE);
00108     u_char bval;
00109 
00110     /* Disable interrupt. */
00111     cbi(SPCR, SPIE);
00112 
00113     switch (cmd) {
00114     case NUT_IRQCTL_INIT:
00115         enabled = 0;
00116     case NUT_IRQCTL_CLEAR:
00117         /* Clear any pending interrupt. */
00118         if (bit_is_set(SPSR, SPIF)) {
00119             bval = inb(SPDR);
00120         }
00121         break;
00122     case NUT_IRQCTL_STATUS:
00123         if (bit_is_set(SPSR, SPIF)) {
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 = 16;
00140         break;
00141 #ifdef NUT_PERFMON
00142     case NUT_IRQCTL_GETCOUNT:
00143         *ival = (u_int) sig_SPI.ir_count;
00144         sig_SPI.ir_count = 0;
00145         break;
00146 #endif
00147     default:
00148         rc = -1;
00149         break;
00150     }
00151 
00152     /* Enable interrupt. */
00153     if (enabled) {
00154         sbi(SPCR, SPIE);
00155     }
00156     return rc;
00157 }
00158 
00162 #ifdef __IMAGECRAFT__
00163 #pragma interrupt_handler SIG_SPI:iv_SPI_STC
00164 #endif
00165 NUTSIGNAL(SIG_SPI, sig_SPI)
00166 
00167 
00168 

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