mirror of
https://github.com/clockworkpi/WiringPi.git
synced 2025-12-12 16:08:49 +01:00
70fa99a127
Added fixed for a few minor things. pin driver for rht03/dht type sensors. Network stuff is experimental - for now.
127 lines
3.1 KiB
C
127 lines
3.1 KiB
C
/*
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* rht03.c:
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* Extend wiringPi with the rht03 Maxdetect 1-Wire sensor.
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* Copyright (c) 2016-2017 Gordon Henderson
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***********************************************************************
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* This file is part of wiringPi:
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* https://projects.drogon.net/raspberry-pi/wiringpi/
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*
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* wiringPi is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation, either version 3 of the
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* License, or (at your option) any later version.
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*
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* wiringPi is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with wiringPi.
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* If not, see <http://www.gnu.org/licenses/>.
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***********************************************************************
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*/
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//#include <sys/types.h>
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//#include <sys/stat.h>
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//#include <fcntl.h>
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//#include <unistd.h>
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//#include <stdint.h>
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#include <stdio.h>
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//#include <string.h>
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#include <time.h>
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//#include <ctype.h>
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#include "wiringPi.h"
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#include "../devLib/maxdetect.h"
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#include "rht03.h"
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/*
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* myReadRHT03:
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* Read the Temperature & Humidity from an RHT03 sensor
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* Values returned are *10, so 123 is 12.3.
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*********************************************************************************
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*/
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static int myReadRHT03 (const int pin, int *temp, int *rh)
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{
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int result ;
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unsigned char buffer [4] ;
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// Read ...
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result = maxDetectRead (pin, buffer) ;
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if (!result)
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return FALSE ;
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*rh = (buffer [0] * 256 + buffer [1]) ;
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*temp = (buffer [2] * 256 + buffer [3]) ;
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if ((*temp & 0x8000) != 0) // Negative
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{
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*temp &= 0x7FFF ;
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*temp = -*temp ;
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}
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// Discard obviously bogus readings - the checksum can't detect a 2-bit error
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// (which does seem to happen - no realtime here)
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if ((*rh > 999) || (*temp > 800) || (*temp < -400))
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return FALSE ;
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return TRUE ;
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}
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/*
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* myAnalogRead:
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*********************************************************************************
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*/
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static int myAnalogRead (struct wiringPiNodeStruct *node, int pin)
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{
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int piPin = node->fd ;
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int chan = pin - node->pinBase ;
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int temp = -9997 ;
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int rh = -9997 ;
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int try ;
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if (chan > 1)
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return -9999 ; // Bad parameters
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for (try = 0 ; try < 10 ; ++try)
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{
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if (myReadRHT03 (piPin, &temp, &rh))
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return chan == 0 ? temp : rh ;
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}
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return -9998 ;
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}
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/*
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* rht03Setup:
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* Create a new instance of an RHT03 temperature sensor.
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*********************************************************************************
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*/
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int rht03Setup (const int pinBase, const int piPin)
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{
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struct wiringPiNodeStruct *node ;
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if ((piPin & PI_GPIO_MASK) != 0) // Must be an on-board pin
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return FALSE ;
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// 2 pins - temperature and humidity
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node = wiringPiNewNode (pinBase, 2) ;
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node->fd = piPin ;
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node->analogRead = myAnalogRead ;
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return TRUE ;
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}
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