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 AvrSpiIrqCtl(int cmd, void *param); 00081 00082 IRQ_HANDLER sig_SPI = { 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 AvrSpiIrqCtl /* Interrupt control, ir_ctl. */ 00089 }; 00090 00106 static int AvrSpiIrqCtl(int cmd, void *param) 00107 { 00108 int rc = 0; 00109 unsigned int *ival = (unsigned int *) param; 00110 int_fast8_t enabled = bit_is_set(SPCR, SPIE); 00111 uint8_t bval; 00112 00113 /* Disable interrupt. */ 00114 cbi(SPCR, SPIE); 00115 00116 switch (cmd) { 00117 case NUT_IRQCTL_INIT: 00118 enabled = 0; 00119 case NUT_IRQCTL_CLEAR: 00120 /* Clear any pending interrupt. */ 00121 if (bit_is_set(SPSR, SPIF)) { 00122 bval = inb(SPDR); 00123 } 00124 break; 00125 case NUT_IRQCTL_STATUS: 00126 if (bit_is_set(SPSR, SPIF)) { 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 = 16; 00143 break; 00144 #ifdef NUT_PERFMON 00145 case NUT_IRQCTL_GETCOUNT: 00146 *ival = (unsigned int) sig_SPI.ir_count; 00147 sig_SPI.ir_count = 0; 00148 break; 00149 #endif 00150 default: 00151 rc = -1; 00152 break; 00153 } 00154 00155 /* Enable interrupt. */ 00156 if (enabled) { 00157 sbi(SPCR, SPIE); 00158 } 00159 return rc; 00160 } 00161 00165 #ifdef __IMAGECRAFT__ 00166 #pragma interrupt_handler SIG_SPI:iv_SPI_STC 00167 #endif 00168 NUTSIGNAL(SIG_SPI, sig_SPI) 00169 00170 00171