00001 /* 00002 * Copyright (C) 2000-2004 by ETH Zurich 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 ETH ZURICH 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 ETH ZURICH 00021 * 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 00034 /* 00035 * unix_timer.c - unix emulation of a real-time clock that is used as a timer 00036 * 00037 * 2004.04.01 Matthias Ringwald <matthias.ringwald@inf.ethz.ch> 00038 * 00039 */ 00040 00041 #ifdef __CYGWIN__ 00042 #include <sys/features.h> 00043 #include <sys/signal.h> 00044 #endif 00045 00046 #include <cfg/os.h> 00047 #include <dev/irqreg.h> 00048 #include <sys/atom.h> 00049 #include <unistd.h> 00050 00051 00052 #ifndef NUT_CPU_FREQ 00053 #define NUT_CPU_FREQ 14000000UL 00054 #endif 00055 00056 extern int timer_count; 00057 00058 /* timer thread, generating ms ticks */ 00059 static pthread_t timer_thread; 00060 00067 #define SCALE 1 00068 00069 void *NutTimerEmulation(void *) __attribute__ ((noreturn)); 00070 void *NutTimerEmulation(void *arg) 00071 { 00072 uint8_t trigger_irq = (uint8_t) (uintptr_t) arg; 00073 00074 // non-nut thread => not interested in SIGUSR1 (IRQ signals) 00075 pthread_sigmask(SIG_BLOCK, &irq_signal, 0); 00076 00077 for( ;; ) { 00078 usleep( 1000 * SCALE ); 00079 00080 NutUnixRaiseInterrupt(trigger_irq); 00081 } 00082 } 00083 00090 void NutRegisterTimer(void (*handler) (void *)) 00091 { 00092 uint8_t timerIrqNr = IRQ_TIMER0; 00093 00094 // register irq handler 00095 NutRegisterIrqHandler(timerIrqNr, handler, (void *) 0); 00096 00097 // create rtc timer simulation 00098 pthread_create(&timer_thread, NULL, NutTimerEmulation, (void *) (uintptr_t) timerIrqNr); 00099 } 00100 00106 uint32_t NutArchClockGet(int idx) 00107 { 00108 return NUT_CPU_FREQ; 00109 } 00110 00116 uint32_t NutGetTickClock(void) 00117 { 00118 return 1000UL; 00119 } 00120 00124 uint32_t NutTimerMillisToTicks(uint32_t ms) 00125 { 00126 return ms; 00127 }