--- a/dht11/dht11.c Sun Jul 15 14:08:19 2018 +0200
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,201 +0,0 @@
-/*****************************************************************************
- * Copyright (C) 2014
- *
- * 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 EC-65K; see the file COPYING. If not, write to the Free
- * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
- *****************************************************************************/
-
-#include "../config.h"
-#include <stdio.h>
-#include <stdlib.h>
-#include <stdint.h>
-#include <stdarg.h>
-#include <syslog.h>
-#include <unistd.h>
-
-#include "dht11.h"
-
-#ifdef HAVE_WIRINGPI_H
-#include <wiringPi.h>
-
-#define MAXTIMINGS 100
-
-int dht11_pin = -1;
-int dht11_temperature = -1;
-int dht11_humidity = -1;
-int dht11_valid = FALSE;
-int dht11_t_offset = 0;
-int dht11_h_offset = 0;
-
-
-
-static uint8_t sizecvt(const int read_value) {
- /*
- * digitalRead() and friends from wiringpi are defined as returning a value
- * < 256. However, they are returned as int() types. This is a safety function
- */
- if (read_value > 255 || read_value < 0) {
- syslog(LOG_NOTICE, "invalid data from wiringPi library");
- }
-
- return (uint8_t)read_value;
-}
-
-
-
-/*
- * DHT11 sensor read. This should be used in a thread loop.
- */
-void dht11Read(void) {
- int tries = 5;
- unsigned short got_correct_data = 0;
-
- if (dht11_pin == -1)
- return;
-
- while (tries && !got_correct_data) {
- uint8_t laststate = HIGH;
- uint8_t counter = 0;
- uint8_t j = 0, i = 0;
- int dht11_dat[5] = {0,0,0,0,0};
-
- /*
- * Select output mode to send the start signal.
- */
- pinMode(dht11_pin, OUTPUT);
- digitalWrite(dht11_pin, HIGH);
- usleep(1000);
-
- /*
- * Low for at least 18 milliseconds
- */
- digitalWrite(dht11_pin, LOW);
- usleep(20000);
- digitalWrite(dht11_pin, HIGH);
- pinMode(dht11_pin, INPUT);
-
- /*
- * Detect change and read data
- */
- for (i=0; i<MAXTIMINGS; i++) {
- counter = 0;
- delayMicroseconds(10);
- while (sizecvt(digitalRead(dht11_pin)) == laststate) {
- counter++;
- delayMicroseconds(1);
- if (counter == 255) {
- break;
- }
- }
- laststate = sizecvt(digitalRead(dht11_pin));
-
- if (counter == 255)
- break;
-
- /*
- * ignore first 3 transitions
- */
- if ((i >= 4) && (i%2 == 0)) {
-
- // shove each bit into the storage bytes
- dht11_dat[(int)((double)j/8)] <<= 1;
- if (counter > 16)
- dht11_dat[(int)((double)j/8)] |= 1;
- j++;
- }
- }
-
- /*
- * If there is no sensor, j = 0
- */
- if ((counter == 255) && (j == 0)) {
- if (dht11_temperature != -1) {
- syslog(LOG_NOTICE, "dht11 sensor disappeared");
- } else {
- syslog(LOG_NOTICE, "dht11 sensor not present");
- }
- dht11_temperature = -1;
- dht11_humidity = -1;
- dht11_valid = FALSE;
- return;
- }
-
- /*
- * check we read 40 bits (8bit x 5 ) + verify checksum in the last byte
- * print it out if data is good
- */
- if ((j >= 40) && (dht11_dat[4] == ((dht11_dat[0] + dht11_dat[1] + dht11_dat[2] + dht11_dat[3]) & 0xFF))) {
- got_correct_data = 1;
-
- int h = dht11_dat[0] + dht11_dat[1];
- int t = (dht11_dat[2] & 0x7F) + dht11_dat[3];
- t += dht11_t_offset;
- h += dht11_h_offset;
-
- if ((dht11_dat[2] & 0x80) != 0)
- t *= -1;
-
- dht11_temperature = t;
- dht11_humidity = h;
- dht11_valid = TRUE;
- } else {
- tries--;
- if (tries == 0)
- syslog(LOG_INFO, "dht11 data checksum was wrong 5 times");
- usleep(100000);
- }
- }
-}
-
-
-
-void dht11Init(int pin, int t_offset, int h_offset) {
- dht11_pin = pin;
- dht11_t_offset = t_offset;
- dht11_h_offset = h_offset;
-}
-
-
-
-int main(int argc, char *argv[]) {
-
- int PIN = 3;
-
- if (wiringPiSetup() == -1)
- return 0;
-
- dht11Init(PIN, 1, 6);
- dht11Read();
- if (dht11_valid) {
- fprintf(stdout, "DHT11: temperature %d degrees, humidity %d%%\n", dht11_temperature, dht11_humidity);
- } else {
- fprintf(stdout, "DHT11: no valid data or sensor not connected\n");
- }
-
- exit(0);
-}
-
-#else
-
-int main(int argc, char *argv[]) {
- fprintf(stderr, "This program does nothing without the wiringPi library\n");
- return 0;
-}
-
-#endif
-