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 #if defined(SIG_2WIRE_SERIAL) || defined(iv_TWI) 00081 00082 static int AvrTwiIrqCtl(int cmd, void *param); 00083 00084 IRQ_HANDLER sig_2WIRE_SERIAL = { 00085 #ifdef NUT_PERFMON 00086 0, /* Interrupt counter, ir_count. */ 00087 #endif 00088 NULL, /* Passed argument, ir_arg. */ 00089 NULL, /* Handler subroutine, ir_handler. */ 00090 AvrTwiIrqCtl /* Interrupt control, ir_ctl. */ 00091 }; 00092 00108 static int AvrTwiIrqCtl(int cmd, void *param) 00109 { 00110 int rc = 0; 00111 u_int *ival = (u_int *) param; 00112 int enabled = bit_is_set(TWCR, TWIE); 00113 u_char bval; 00114 00115 /* Disable interrupt. */ 00116 cbi(TWCR, TWIE); 00117 00118 switch (cmd) { 00119 case NUT_IRQCTL_INIT: 00120 enabled = 0; 00121 case NUT_IRQCTL_CLEAR: 00122 /* Clear any pending interrupt. */ 00123 if (bit_is_set(SPSR, SPIF)) { 00124 bval = inb(SPDR); 00125 } 00126 break; 00127 case NUT_IRQCTL_STATUS: 00128 if (bit_is_set(TWCR, TWINT)) { 00129 *ival = 1; 00130 } else { 00131 *ival = 0; 00132 } 00133 if (enabled) { 00134 *ival |= 0x80; 00135 } 00136 break; 00137 case NUT_IRQCTL_ENABLE: 00138 enabled = 1; 00139 break; 00140 case NUT_IRQCTL_DISABLE: 00141 enabled = 0; 00142 break; 00143 case NUT_IRQCTL_GETPRIO: 00144 *ival = 16; 00145 break; 00146 #ifdef NUT_PERFMON 00147 case NUT_IRQCTL_GETCOUNT: 00148 *ival = (u_int) sig_2WIRE_SERIAL.ir_count; 00149 sig_2WIRE_SERIAL.ir_count = 0; 00150 break; 00151 #endif 00152 default: 00153 rc = -1; 00154 break; 00155 } 00156 00157 /* Enable interrupt. */ 00158 if (enabled) { 00159 sbi(TWCR, TWIE); 00160 } 00161 return rc; 00162 } 00163 00167 #ifdef __IMAGECRAFT__ 00168 #pragma interrupt_handler SIG_2WIRE_SERIAL:iv_TWI 00169 #endif 00170 NUTSIGNAL(SIG_2WIRE_SERIAL, sig_2WIRE_SERIAL) 00171 #endif 00172