Wed, 24 Apr 2024 16:46:45 +0200
Fermenter editor layout is ready. Load record done. Add and Delete a new fermenter is done.
/** * @file delay.c * #brief Thread friendly delay functions. * * Copyright (C) 2024 * * Michiel Broek <mbroek at mbse dot eu> * * This file is part of the mbsePi-apps * * This is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the * Free Software Foundation; either version 2, or (at your option) any * later version. * * mbsePi-apps is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with ThermFerm; see the file COPYING. If not, write to the Free * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include "delay.h" #include "thermferm.h" void delay (unsigned int howLong) { struct timespec sleeper, dummy ; sleeper.tv_sec = (time_t)(howLong / 1000) ; sleeper.tv_nsec = (long)(howLong % 1000) * 1000000 ; nanosleep (&sleeper, &dummy) ; } /** * @brief mDelay Delay number of milliseconds. * @param howLong The number of milliseconds. */ void mDelay(unsigned int howLong) { struct timespec sleeper ; unsigned int mSecs = howLong % 1000 ; unsigned int wSecs = howLong / 1000 ; /**/ if (howLong == 0) return ; else { sleeper.tv_sec = wSecs ; sleeper.tv_nsec = (long)(mSecs * 1000000L) ; nanosleep (&sleeper, NULL) ; } } /* * Code from wiringPi, Gordon. * * delayMicroseconds: * This is somewhat intersting. It seems that on the Pi, a single call * to nanosleep takes some 80 to 130 microseconds anyway, so while * obeying the standards (may take longer), it's not always what we * want! * * So what I'll do now is if the delay is less than 100uS we'll do it * in a hard loop, watching a built-in counter on the ARM chip. This is * somewhat sub-optimal in that it uses 100% CPU, something not an issue * in a microcontroller, but under a multi-tasking, multi-user OS, it's * wastefull, however we've no real choice )-: * * Plan B: It seems all might not be well with that plan, so changing it * to use gettimeofday () and poll on that instead... ********************************************************************************* */ void delayMicrosecondsHard (unsigned int howLong) { struct timeval tNow, tLong, tEnd ; gettimeofday (&tNow, NULL) ; tLong.tv_sec = howLong / 1000000 ; tLong.tv_usec = howLong % 1000000 ; timeradd (&tNow, &tLong, &tEnd) ; while (timercmp (&tNow, &tEnd, <)) gettimeofday (&tNow, NULL) ; } /** * @brief uDelay Delays a number of microseconds. Also used to replace usleep(). * @param howLong The number is microseconds. */ void uDelay(unsigned int howLong) { struct timespec sleeper ; unsigned int uSecs = howLong % 1000000 ; unsigned int wSecs = howLong / 1000000 ; /**/ if (howLong == 0) return ; else if (howLong < 100) delayMicrosecondsHard(howLong) ; else { sleeper.tv_sec = wSecs ; sleeper.tv_nsec = (long)(uSecs * 1000L) ; nanosleep (&sleeper, NULL) ; } }