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[/] [openmsp430/] [trunk/] [fpga/] [altera_de0_nano_soc/] [doc/] [Terasic/] [DE0_NANO_SOC/] [Demonstrations/] [FPGA/] [DE0_NANO_SOC_ADC/] [software/] [DE0_NANO_SOC_ADC_bsp/] [drivers/] [src/] [altera_avalon_sysid_qsys.c] - Rev 221
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/****************************************************************************** * * * License Agreement * * * * Copyright (c) 2003 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. * * * * Altera does not recommend, suggest or require that this reference design * * file be used in conjunction or combination with any other product. * ******************************************************************************/ #include "altera_avalon_sysid_qsys.h" #include "altera_avalon_sysid_qsys_regs.h" #include "alt_types.h" #include <io.h> /* * This component is special: there's only one of it. * Therefore we can dispense with a bunch of complexity * normally associated with components, such as specialized * structs containing parameter info, and instead use that * info by name directly out of system.h. A downside of this * approach is that each time the system is regenerated, and * system.h changes, this file must be recompiled. Fortunately * this file is, and is likely to remain, quite small. */ #include "system.h" #ifdef SYSID_BASE /* * return values: * 0 if the hardware and software appear to be in sync * 1 if software appears to be older than hardware * -1 if hardware appears to be older than software */ alt_32 alt_avalon_sysid_qsys_test(void) { /* Read the hardware-tag, aka value0, from the hardware. */ alt_u32 hardware_id = IORD_ALTERA_AVALON_SYSID_QSYS_ID(SYSID_BASE); /* Read the time-of-generation, aka value1, from the hardware register. */ alt_u32 hardware_timestamp = IORD_ALTERA_AVALON_SYSID_QSYS_TIMESTAMP(SYSID_BASE); /* Return 0 if the hardware and software appear to be in sync. */ if ((SYSID_TIMESTAMP == hardware_timestamp) && (SYSID_ID == hardware_id)) { return 0; } /* * Return 1 if software appears to be older than hardware (that is, * the value returned by the hardware is larger than that recorded by * the generator function). * If the hardware time happens to match the generator program's value * (but the hardware tag, value0, doesn't match or 0 would have been * returned above), return an arbitrary value, let's say -1. */ return ((alt_32)(hardware_timestamp - SYSID_TIMESTAMP)) > 0 ? 1 : -1; } #endif