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王立帮
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arduino-cli/libraries/dht/dht.cpp
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201
arduino-cli/libraries/dht/dht.cpp
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//
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// FILE: dht.cpp
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.22
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: http://arduino.cc/playground/Main/DHTLib
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//
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// HISTORY:
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// 0.1.22 undo delayMicroseconds() for wakeups larger than 8
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// 0.1.21 replace delay with delayMicroseconds() + small fix
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// 0.1.20 Reduce footprint by using uint8_t as error codes. (thanks to chaveiro)
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// 0.1.19 masking error for DHT11 - FIXED (thanks Richard for noticing)
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// 0.1.18 version 1.16/17 broke the DHT11 - FIXED
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// 0.1.17 replaced micros() with adaptive loopcount
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// removed DHTLIB_INVALID_VALUE
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// added DHTLIB_ERROR_CONNECT
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// added DHTLIB_ERROR_ACK_L DHTLIB_ERROR_ACK_H
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// 0.1.16 masking unused bits (less errors); refactored bits[]
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// 0.1.15 reduced # micros calls 2->1 in inner loop.
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// 0.1.14 replace digital read with faster (~3x) code => more robust low MHz machines.
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//
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// 0.1.13 fix negative temperature
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// 0.1.12 support DHT33 and DHT44 initial version
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// 0.1.11 renamed DHTLIB_TIMEOUT
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// 0.1.10 optimized faster WAKEUP + TIMEOUT
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// 0.1.09 optimize size: timeout check + use of mask
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// 0.1.08 added formula for timeout based upon clockspeed
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// 0.1.07 added support for DHT21
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// 0.1.06 minimize footprint (2012-12-27)
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// 0.1.05 fixed negative temperature bug (thanks to Roseman)
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// 0.1.04 improved readability of code using DHTLIB_OK in code
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// 0.1.03 added error values for temp and humidity when read failed
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// 0.1.02 added error codes
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// 0.1.01 added support for Arduino 1.0, fixed typos (31/12/2011)
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// 0.1.00 by Rob Tillaart (01/04/2011)
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//
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// inspired by DHT11 library
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//
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// Released to the public domain
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//
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#include "dht.h"
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/////////////////////////////////////////////////////
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//
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// PUBLIC
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//
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int8_t dht::read11(uint8_t pin)
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{
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// READ VALUES
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int8_t result = _readSensor(pin, DHTLIB_DHT11_WAKEUP, DHTLIB_DHT11_LEADING_ZEROS);
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// these bits are always zero, masking them reduces errors.
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bits[0] &= 0x7F;
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bits[2] &= 0x7F;
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// CONVERT AND STORE
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humidity = bits[0]; // bits[1] == 0;
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temperature = bits[2]; // bits[3] == 0;
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// TEST CHECKSUM
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// bits[1] && bits[3] both 0
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uint8_t sum = bits[0] + bits[2];
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if (bits[4] != sum)
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{
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return DHTLIB_ERROR_CHECKSUM;
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}
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return result;
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}
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int8_t dht::read(uint8_t pin)
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{
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// READ VALUES
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int8_t result = _readSensor(pin, DHTLIB_DHT_WAKEUP, DHTLIB_DHT_LEADING_ZEROS);
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// these bits are always zero, masking them reduces errors.
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bits[0] &= 0x03;
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bits[2] &= 0x83;
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// CONVERT AND STORE
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humidity = (bits[0]*256 + bits[1]) * 0.1;
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temperature = ((bits[2] & 0x7F)*256 + bits[3]) * 0.1;
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if (bits[2] & 0x80) // negative temperature
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{
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temperature = -temperature;
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}
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// TEST CHECKSUM
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uint8_t sum = bits[0] + bits[1] + bits[2] + bits[3];
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if (bits[4] != sum)
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{
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return DHTLIB_ERROR_CHECKSUM;
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}
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return result;
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}
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/////////////////////////////////////////////////////
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//
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// PRIVATE
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//
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int8_t dht::_readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits)
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{
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// INIT BUFFERVAR TO RECEIVE DATA
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uint8_t mask = 128;
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uint8_t idx = 0;
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uint8_t data = 0;
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uint8_t state = LOW;
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uint8_t pstate = LOW;
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uint16_t zeroLoop = DHTLIB_TIMEOUT;
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uint16_t delta = 0;
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leadingZeroBits = 40 - leadingZeroBits; // reverse counting...
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// replace digitalRead() with Direct Port Reads.
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// reduces footprint ~100 bytes => portability issue?
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// direct port read is about 3x faster
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uint8_t bit = digitalPinToBitMask(pin);
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uint8_t port = digitalPinToPort(pin);
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volatile uint8_t *PIR = portInputRegister(port);
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// REQUEST SAMPLE
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pinMode(pin, OUTPUT);
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digitalWrite(pin, LOW); // T-be
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if (wakeupDelay > 8) delay(wakeupDelay);
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else delayMicroseconds(wakeupDelay * 1000UL);
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digitalWrite(pin, HIGH); // T-go
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pinMode(pin, INPUT);
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uint16_t loopCount = DHTLIB_TIMEOUT * 2; // 200uSec max
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// while(digitalRead(pin) == HIGH)
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while ((*PIR & bit) != LOW )
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{
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if (--loopCount == 0) return DHTLIB_ERROR_CONNECT;
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}
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// GET ACKNOWLEDGE or TIMEOUT
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loopCount = DHTLIB_TIMEOUT;
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// while(digitalRead(pin) == LOW)
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while ((*PIR & bit) == LOW ) // T-rel
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{
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if (--loopCount == 0) return DHTLIB_ERROR_ACK_L;
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}
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loopCount = DHTLIB_TIMEOUT;
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// while(digitalRead(pin) == HIGH)
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while ((*PIR & bit) != LOW ) // T-reh
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{
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if (--loopCount == 0) return DHTLIB_ERROR_ACK_H;
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}
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loopCount = DHTLIB_TIMEOUT;
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// READ THE OUTPUT - 40 BITS => 5 BYTES
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for (uint8_t i = 40; i != 0; )
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{
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// WAIT FOR FALLING EDGE
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state = (*PIR & bit);
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if (state == LOW && pstate != LOW)
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{
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if (i > leadingZeroBits) // DHT22 first 6 bits are all zero !! DHT11 only 1
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{
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zeroLoop = min(zeroLoop, loopCount);
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delta = (DHTLIB_TIMEOUT - zeroLoop)/4;
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}
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else if ( loopCount <= (zeroLoop - delta) ) // long -> one
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{
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data |= mask;
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}
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mask >>= 1;
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if (mask == 0) // next byte
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{
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mask = 128;
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bits[idx] = data;
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idx++;
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data = 0;
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}
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// next bit
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--i;
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// reset timeout flag
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loopCount = DHTLIB_TIMEOUT;
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}
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pstate = state;
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// Check timeout
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if (--loopCount == 0)
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{
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return DHTLIB_ERROR_TIMEOUT;
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}
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}
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pinMode(pin, OUTPUT);
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digitalWrite(pin, HIGH);
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return DHTLIB_OK;
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}
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//
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// END OF FILE
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//
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77
arduino-cli/libraries/dht/dht.h
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77
arduino-cli/libraries/dht/dht.h
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@@ -0,0 +1,77 @@
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//
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// FILE: dht.h
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// AUTHOR: Rob Tillaart
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// VERSION: 0.1.22
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// PURPOSE: DHT Temperature & Humidity Sensor library for Arduino
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// URL: http://arduino.cc/playground/Main/DHTLib
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//
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// HISTORY:
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// see dht.cpp file
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//
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#ifndef dht_h
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#define dht_h
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#if ARDUINO < 100
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#include <WProgram.h>
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#include <pins_arduino.h> // fix for broken pre 1.0 version - TODO TEST
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#else
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#include <Arduino.h>
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#endif
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#define DHT_LIB_VERSION "0.1.22"
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#define DHTLIB_OK 0
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#define DHTLIB_ERROR_CHECKSUM -1
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#define DHTLIB_ERROR_TIMEOUT -2
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#define DHTLIB_ERROR_CONNECT -3
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#define DHTLIB_ERROR_ACK_L -4
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#define DHTLIB_ERROR_ACK_H -5
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#define DHTLIB_DHT11_WAKEUP 18
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#define DHTLIB_DHT_WAKEUP 1
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#define DHTLIB_DHT11_LEADING_ZEROS 1
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#define DHTLIB_DHT_LEADING_ZEROS 6
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// max timeout is 100 usec.
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// For a 16 Mhz proc 100 usec is 1600 clock cycles
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// loops using DHTLIB_TIMEOUT use at least 4 clock cycli
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// so 100 us takes max 400 loops
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// so by dividing F_CPU by 40000 we "fail" as fast as possible
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#ifndef F_CPU
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#define DHTLIB_TIMEOUT 1000 // ahould be approx. clock/40000
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#else
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#define DHTLIB_TIMEOUT (F_CPU/40000)
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#endif
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class dht
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{
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public:
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dht() {};
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// return values:
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// DHTLIB_OK
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// DHTLIB_ERROR_CHECKSUM
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// DHTLIB_ERROR_TIMEOUT
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// DHTLIB_ERROR_CONNECT
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// DHTLIB_ERROR_ACK_L
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// DHTLIB_ERROR_ACK_H
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int8_t read11(uint8_t pin);
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int8_t read(uint8_t pin);
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inline int8_t read21(uint8_t pin) { return read(pin); };
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inline int8_t read22(uint8_t pin) { return read(pin); };
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inline int8_t read33(uint8_t pin) { return read(pin); };
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inline int8_t read44(uint8_t pin) { return read(pin); };
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double humidity;
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double temperature;
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private:
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uint8_t bits[5]; // buffer to receive data
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int8_t _readSensor(uint8_t pin, uint8_t wakeupDelay, uint8_t leadingZeroBits);
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};
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#endif
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//
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// END OF FILE
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//
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