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[/] [sockit_owm/] [trunk/] [HAL/] [src/] [sockit_owm.c] - Rev 5
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/****************************************************************************** * * * Minimalistic 1-wire (onewire) master with Avalon MM bus interface * * Copyright (C) 2010 Iztok Jeras * * Since the code is based on an Altera app note, I kept their license. * * * * License Agreement * * * * Copyright (c) 2008 Altera Corporation, San Jose, California, USA. * * All rights reserved. * * * * Permission is hereby granted, free of charge, to any person obtaining a * * copy of this software and associated documentation files (the "Software"), * * to deal in the Software without restriction, including without limitation * * the rights to use, copy, modify, merge, publish, distribute, sublicense, * * and/or sell copies of the Software, and to permit persons to whom the * * Software is furnished to do so, subject to the following conditions: * * * * The above copyright notice and this permission notice shall be included in * * all copies or substantial portions of the Software. * * * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * * DEALINGS IN THE SOFTWARE. * * * * This agreement shall be governed in all respects by the laws of the State * * of California and by the laws of the United States of America. * * * ******************************************************************************/ // this header would be used if a proper file handler could be assidned, // but due to global variables in the public domain kit, this is not possible //#include <fcntl.h> #include "sys/alt_dev.h" #include "sys/alt_irq.h" #include "sys/ioctl.h" #include "sys/alt_errno.h" #include "sockit_owm_regs.h" #include "sockit_owm.h" extern sockit_owm_state sockit_owm; #ifndef SOCKIT_OWM_POLLING ////////////////////////////////////////////////////////////////////////////// // interrupt implementation ////////////////////////////////////////////////////////////////////////////// #ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT static void sockit_owm_irq (); #else static void sockit_owm_irq (alt_u32 id); #endif void sockit_owm_init (alt_u32 irq) { int error; // initialize semaphore for 1-wire cycle locking error = ALT_FLAG_CREATE (sockit_owm.irq, 0) || ALT_SEM_CREATE (sockit_owm.cyc, 1); if (!error) { // enable interrupt sockit_owm.ien = 0x1; // register the interrupt handler #ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT alt_ic_isr_register (0, irq, sockit_owm_irq, NULL, 0x0); #else alt_irq_register (irq, NULL, sockit_owm_irq); #endif } } #ifdef ALT_ENHANCED_INTERRUPT_API_PRESENT static void sockit_owm_irq(void * state) #else static void sockit_owm_irq(void * state, alt_u32 id) #endif { // clear onewire interrupts IORD_SOCKIT_OWM_CTL (sockit_owm.base); // set the flag indicating a completed 1-wire cycle ALT_FLAG_POST (sockit_owm.irq, 0x1, OS_FLAG_SET); } #else ////////////////////////////////////////////////////////////////////////////// // polling implementation ////////////////////////////////////////////////////////////////////////////// #endif