Revision 0:9ef709bfeb08, committed 2012-07-10

Comitter:

Wimpie

Date:

Tue Jul 10 13:11:23 2012 +0000

Child:

1:731de3b11b74

Commit message:

Changed in this revision

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DHT/DHT.cpp	Tue Jul 10 13:11:23 2012 +0000
@@ -0,0 +1,233 @@
+/*
+ *  DHT Library for  Digital-output Humidity and Temperature sensors
+ *
+ *  Works with DHT11, DHT22
+ *             SEN11301P,  Grove - Temperature&Humidity Sensor     (Seeed Studio)
+ *             SEN51035P,  Grove - Temperature&Humidity Sensor Pro (Seeed Studio)
+ *             AM2302   ,  temperature-humidity sensor
+ *             HM2303   ,  Digital-output humidity and temperature sensor
+ *
+ *  Copyright (C) Wim De Roeve
+ *                based on DHT22 sensor library by HO WING KIT
+ *                Arduino DHT11 library 
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documnetation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to  whom the Software is
+ * furished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "DHT.h"
+
+#define DHT_DATA_BIT_COUNT 41
+
+DHT::DHT(PinName pin,int DHTtype) {
+    _pin = pin;
+    _DHTtype = DHTtype;
+    _firsttime=true;
+}
+
+DHT::~DHT() {
+}
+
+int DHT::readData() {
+    int i, j, retryCount,b;
+    unsigned int bitTimes[DHT_DATA_BIT_COUNT];
+
+    eError err = ERROR_NONE;
+    time_t currentTime = time(NULL);
+
+    DigitalInOut DHT_io(_pin);
+
+    for (i = 0; i < DHT_DATA_BIT_COUNT; i++) {
+        bitTimes[i] = 0;
+    }
+
+    if (!_firsttime) {
+        if (int(currentTime - _lastReadTime) < 2) {
+            err = ERROR_NO_PATIENCE;
+            return err;
+        }
+    } else {
+        _firsttime=false;
+        _lastReadTime=currentTime;
+    }
+    retryCount = 0;
+
+    do {
+        if (retryCount > 125) {
+            err = BUS_BUSY;
+            return err;
+        }
+        retryCount ++;
+        wait_us(2);
+    } while ((DHT_io==0));
+
+
+    DHT_io.output();
+    DHT_io = 0;
+    wait_ms(18);
+    DHT_io = 1;
+    wait_us(40);
+    DHT_io.input();
+
+    retryCount = 0;
+    do {
+        if (retryCount > 40)  {
+            err = ERROR_NOT_PRESENT;
+            return err;
+        }
+        retryCount++;
+        wait_us(1);
+    } while ((DHT_io==1));
+
+    if (err != ERROR_NONE) {
+        return err;
+    }
+
+    wait_us(80);
+
+    for (i = 0; i < 5; i++) {
+        for (j = 0; j < 8; j++) {
+
+            retryCount = 0;
+            do {
+                if (retryCount > 75)  {
+                    err = ERROR_DATA_TIMEOUT;
+                    return err;
+                }
+                retryCount++;
+                wait_us(1);
+            } while (DHT_io == 0);
+            wait_us(40);
+            bitTimes[i*8+j]=DHT_io;
+
+            int count = 0;
+            while (DHT_io == 1 && count < 100) {
+                wait_us(1);
+                count++;
+            }
+        }
+    }
+    DHT_io.output();
+    DHT_io = 1;
+    for (i = 0; i < 5; i++) {
+        b=0;
+        for (j=0; j<8; j++) {
+            if (bitTimes[i*8+j+1] > 0) {
+                b |= ( 1 << (7-j));
+            }
+        }
+        DHT_data[i]=b;
+    }
+
+    if (DHT_data[4] == ((DHT_data[0] + DHT_data[1] + DHT_data[2] + DHT_data[3]) & 0xFF)) {
+        _lastReadTime = currentTime;
+        _lastTemperature=CalcTemperature();
+        _lastHumidity=CalcHumidity();
+
+    } else {
+        err = ERROR_CHECKSUM;
+    }
+
+    return err;
+
+}
+
+float DHT::CalcTemperature() {
+    int v;
+
+    switch (_DHTtype) {
+        case DHT11:
+            v = DHT_data[2];
+            return float(v);
+        case DHT22:
+            v = DHT_data[2] & 0x7F;
+            v *= 256;
+            v += DHT_data[3];
+            v /= 10;
+            if (DHT_data[2] & 0x80)
+                v *= -1;
+            return float(v);
+    }
+    return 0;
+}
+
+float DHT::ReadHumidity() {
+    return _lastHumidity;
+}
+
+float DHT::ConvertCelciustoFarenheit(float celsius) {
+    return celsius * 9 / 5 + 32;
+}
+
+float DHT::ConvertCelciustoKelvin(float celsius) {
+    return celsius + 273.15;
+}
+
+// dewPoint function NOAA
+// reference: http://wahiduddin.net/calc/density_algorithms.htm
+float DHT::CalcdewPoint(float celsius, float humidity) {
+    float A0= 373.15/(273.15 + celsius);
+    float SUM = -7.90298 * (A0-1);
+    SUM += 5.02808 * log10(A0);
+    SUM += -1.3816e-7 * (pow(10, (11.344*(1-1/A0)))-1) ;
+    SUM += 8.1328e-3 * (pow(10,(-3.49149*(A0-1)))-1) ;
+    SUM += log10(1013.246);
+    float VP = pow(10, SUM-3) * humidity;
+    float T = log(VP/0.61078);   // temp var
+    return (241.88 * T) / (17.558-T);
+}
+
+// delta max = 0.6544 wrt dewPoint()
+// 5x faster than dewPoint()
+// reference: http://en.wikipedia.org/wiki/Dew_point
+float DHT::CalcdewPointFast(float celsius, float humidity)
+{
+        float a = 17.271;
+        float b = 237.7;
+        float temp = (a * celsius) / (b + celsius) + log(humidity/100);
+        float Td = (b * temp) / (a - temp);
+        return Td;
+}
+
+float DHT::ReadTemperature(eScale Scale) {
+    if (Scale == FARENHEIT)
+        return ConvertCelciustoFarenheit(_lastTemperature);
+    else if (Scale == KELVIN)
+        return ConvertCelciustoKelvin(_lastTemperature);
+    else
+        return _lastTemperature;
+}
+
+float DHT::CalcHumidity() {
+    int v;
+
+    switch (_DHTtype) {
+        case DHT11:
+            v = DHT_data[0];
+            return float(v);
+        case DHT22:
+            v = DHT_data[0];
+            v *= 256;
+            v += DHT_data[1];
+            v /= 10;
+            return float(v);
+    }
+    return 0;
+}
+
+

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/DHT/DHT.h	Tue Jul 10 13:11:23 2012 +0000
@@ -0,0 +1,94 @@
+/* 
+ *  DHT Library for  Digital-output Humidity and Temperature sensors 
+ *  
+ *  Works with DHT11, DHT21, DHT22
+ *             SEN11301P,  Grove - Temperature&Humidity Sensor     (Seeed Studio)
+ *             SEN51035P,  Grove - Temperature&Humidity Sensor Pro (Seeed Studio)
+ *             AM2302   ,  temperature-humidity sensor    
+ *             RHT01,RHT02, RHT03    ,  Humidity and Temperature Sensor         (Sparkfun)
+ *
+ *  Copyright (C) Wim De Roeve
+ *                based on DHT22 sensor library by HO WING KIT
+ *                Arduino DHT11 library
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documnetation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to  whom the Software is
+ * furished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS OR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#ifndef MBED_DHT_H
+#define MBED_DHT_H
+
+#include "mbed.h"
+
+enum eType{
+        DHT11     = 11,
+        SEN11301P = 11,
+        RHT01     = 11,
+        DHT22     = 22,
+        AM2302    = 22,
+        SEN51035P = 22,
+        RHT02     = 22,
+        RHT03     = 22
+    } ;
+
+enum eError {
+    ERROR_NONE = 0,
+    BUS_BUSY =1,
+    ERROR_NOT_PRESENT =2 ,
+    ERROR_ACK_TOO_LONG =3 ,
+    ERROR_SYNC_TIMEOUT = 4,
+    ERROR_DATA_TIMEOUT =5 ,
+    ERROR_CHECKSUM = 6,
+    ERROR_NO_PATIENCE =7
+} ;
+
+typedef enum {
+    CELCIUS =0 ,
+    FARENHEIT =1,
+    KELVIN=2
+} eScale;
+
+
+class DHT {
+
+public:
+
+    DHT(PinName pin,int DHTtype);
+    ~DHT();
+    int readData(void);
+    float ReadHumidity(void);
+    float ReadTemperature(eScale Scale);
+    float CalcdewPoint(float celsius, float humidity);
+    float CalcdewPointFast(float celsius, float humidity);
+
+private:
+    time_t  _lastReadTime;
+    float _lastTemperature;
+    float _lastHumidity;
+    PinName _pin;
+    bool _firsttime;
+    int _DHTtype;
+    int DHT_data[6];
+    float CalcTemperature();
+    float CalcHumidity();
+    float ConvertCelciustoFarenheit(float);
+    float ConvertCelciustoKelvin(float);
+
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Debug/DebugTrace.cpp	Tue Jul 10 13:11:23 2012 +0000
@@ -0,0 +1,138 @@
+/*
+* DebugTrace. Allows dumping debug messages/values to serial or
+* to file.
+*
+* Copyright (C) <2009> Petras Saduikis <petras@petras.co.uk>
+*
+* This file is part of DebugTrace.
+*
+* DebugTrace 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 3 of the License, or
+* (at your option) any later version.
+*
+* DebugTrace 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 DebugTrace.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "DebugTrace.h"
+#include <mbed.h>
+#include <stdarg.h>
+//#include <string.h>
+
+Serial logSerial(USBTX, USBRX);
+//LocalFileSystem local("local");
+
+//const char* FILE_PATH = "/sd/";
+//const char* EXTN = ".bak";
+
+DebugTrace::DebugTrace(eLog on, eLogTarget mode)://, const char* fileName, int maxSize) :
+        enabled(on), logMode(mode) { //, maxFileSize(maxSize), currentFileSize(0), logFileStatus(0)
+    /*
+    // allocate memory for file name strings
+       int str_size = (strlen(fileName) + strlen(FILE_PATH) + strlen(EXTN) + 1) * sizeof(char);
+       logFile = (char*)malloc(str_size);
+       logFileBackup = (char*)malloc(str_size);
+
+       // add path to log file name
+       strcpy(logFile, FILE_PATH);
+       strcat(logFile, fileName);
+
+       // create backup file name
+       strcpy(logFileBackup, logFile);
+       strcpy(logFileBackup, strtok(logFileBackup, "."));
+       strcat(logFileBackup, EXTN);*/
+  //  logSerial.baud(115200);
+}
+
+
+DebugTrace::~DebugTrace() {
+    // dust to dust, ashes to ashes
+    /*if (logFile != NULL) free(logFile);
+    if (logFileBackup != NULL) free(logFileBackup);*/
+}
+
+void DebugTrace::clear() {
+    // don't care about whether these fail
+    /*remove(logFile);
+    remove(logFileBackup);*/
+}
+
+void DebugTrace::backupLog() {
+    // delete previous backup file
+    /*if (remove(logFileBackup))
+    {
+        // standard copy stuff
+        char ch;
+        FILE* to = fopen(logFileBackup, "wb");
+        if (NULL != to)
+        {
+            FILE* from = fopen(logFile, "rb");
+            if (NULL != from)
+            {
+                while(!feof(from))
+                {
+                    ch = fgetc(from);
+                    if (ferror(from)) break;
+
+                    if(!feof(from)) fputc(ch, to);
+                    if (ferror(to)) break;
+                }
+            }
+
+            if (NULL != from) fclose(from);
+            if (NULL != to) fclose(to);
+        }
+    }
+
+    // now delete the log file, so we are ready to start again
+    // even if backup creation failed - the show must go on!
+    logFileStatus = remove(logFile);*/
+}
+
+void DebugTrace::traceOut(const char* fmt, ...) {
+    if (enabled) {
+        va_list ap;            // argument list pointer
+        va_start(ap, fmt);
+
+        if (TO_SERIAL == logMode) {
+            vfprintf(logSerial, fmt, ap);
+           
+        } else { // TO_FILE
+            /*vfprintf(logSerial, fmt, ap);
+               if (0 == logFileStatus)    // otherwise we failed to remove a full log file
+               {
+                   // Write data to file. Note the file size may go over limit
+                   // as we check total size afterwards, using the size written to file.
+                   // This is not a big issue, as this mechanism is only here
+                   // to stop the file growing unchecked. Just remember log file sizes may
+                   // be some what over (as apposed to some what under), so don't push it
+                   // with the max file size.
+                   FILE* fp = fopen(logFile, "a");
+                   if (NULL == fp)
+                   {
+                       va_end(ap);
+                       return;
+                   }
+                   int size_written = vfprintf(fp, fmt, ap);
+                   fclose(fp);
+
+                   // check if we are over the max file size
+                   // if so backup file and start again
+                   currentFileSize += size_written;
+                   if (currentFileSize >= maxFileSize)
+                   {
+                       backupLog();
+                       currentFileSize = 0;
+                   }
+               }*/
+        }
+
+        va_end(ap);
+    }
+}

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Debug/DebugTrace.h	Tue Jul 10 13:11:23 2012 +0000
@@ -0,0 +1,51 @@
+/*
+* DebugTrace. Allows dumping debug messages/values to serial or
+* to file.
+*
+* Copyright (C) <2009> Petras Saduikis <petras@petras.co.uk>
+*
+* This file is part of DebugTrace.
+*
+* DebugTrace 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 3 of the License, or
+* (at your option) any later version.
+* 
+* DebugTrace 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 DebugTrace.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef SNATCH59_DEBUGTRACE_H
+#define SNATCH59_DEBUGTRACE_H
+
+enum eLog {OFF, ON};
+enum eLogTarget {TO_SERIAL, TO_FILE};
+
+class DebugTrace
+{
+public:
+   
+    DebugTrace(eLog on, eLogTarget mode);//, const char* fileName = "debuglog.txt", const int maxSize = 4194304);
+    ~DebugTrace();
+  //  char message[80];
+    void clear();
+    void traceOut(const char* fmt, ...);
+    
+private:
+    eLog enabled;
+    eLogTarget logMode;
+  /*  int maxFileSize;
+    int currentFileSize;
+    char* logFile;
+    char* logFileBackup;
+    int logFileStatus;            // if things go wrong, don't write any more data to file*/
+    
+    void backupLog();
+};
+
+#endif

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Tue Jul 10 13:11:23 2012 +0000
@@ -0,0 +1,28 @@
+#include "mbed.h"
+#include "DHT.h"
+
+DigitalOut myled(LED1);
+
+DHT sensor(p23,SEN11301P); // Use the SEN11301P sensor
+
+int main() {
+    int err;
+    printf("\r\nDHT Test program");
+    printf("\r\n******************\r\n");
+    wait(1); // wait 1 second for device stable status
+    while (1) {
+        myled = 1;
+        err = sensor.readData();
+        if (err == 0) {
+            printf("Temperature is %4.2f C \r\n",sensor.ReadTemperature(CELCIUS));
+            printf("Temperature is %4.2f F \r\n",sensor.ReadTemperature(FARENHEIT));
+            printf("Temperature is %4.2f K \r\n",sensor.ReadTemperature(KELVIN));
+            printf("Humidity is %4.2f \r\n",sensor.ReadHumidity());
+            printf("Dew point is %4.2f  \r\n",sensor.CalcdewPoint(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
+            printf("Dew point (fast) is %4.2f  \r\n",sensor.CalcdewPointFast(sensor.ReadTemperature(CELCIUS), sensor.ReadHumidity()));
+        } else
+            printf("\r\nErr %i \n",err);
+        myled = 0;
+        wait(5);
+    }
+}
\ No newline at end of file

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Tue Jul 10 13:11:23 2012 +0000
@@ -0,0 +1,1 @@
+http://mbed.org/users/mbed_official/code/mbed/builds/737756e0b479