DS2438_DHT22/DS2438_DHT22.c

   1 // Copyright (c) 2015, Tobias Mueller tm(at)tm3d.de
   2 // All rights reserved.
   3 //
   4 // Redistribution and use in source and binary forms, with or without
   5 // modification, are permitted provided that the following conditions are
   6 // met:
   7 //
   8 //  * Redistributions of source code must retain the above copyright
   9 //    notice, this list of conditions and the following disclaimer.
  10 //  * Redistributions in binary form must reproduce the above copyright
  11 //    notice, this list of conditions and the following disclaimer in the
  12 //    documentation and/or other materials provided with the
  13 //    distribution.
  14 //  * All advertising materials mentioning features or use of this
  15 //    software must display the following acknowledgement: This product
  16 //    includes software developed by tm3d.de and its contributors.
  17 //  * Neither the name of tm3d.de nor the names of its contributors may
  18 //    be used to endorse or promote products derived from this software
  19 //    without specific prior written permission.
  20 //
  21 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  22 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  23 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  24 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  25 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  26 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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  29 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  30 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  31 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32
  33
  34 #define F_CPU 8000000UL
  35 #include <avr/io.h>
  36 #include <avr/interrupt.h>
  37 #include <util/delay.h>
  38 #include <avr/wdt.h>
  39 #include <avr/sleep.h>
  40 #include <avr/pgmspace.h>
  41
  42
  43 extern void OWINIT();
  44 extern void EXTERN_SLEEP();
  45
  46 uint8_t owid[8]={0x26, 0xA2, 0xD9, 0x84, 0xDD, 0xDD, 0x05, 0xCE};/**/
  47 uint8_t config_info[16]={0x01,0x06, 0x05,0x08, 0x04,0x07, 0x00,0x00, 0x01,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
  48
  49
  50
  51 extern uint8_t mode;
  52 extern uint8_t gcontrol;
  53 extern uint8_t reset_indicator;
  54 extern uint8_t alarmflag;
  55
  56 volatile uint8_t wdcounter;
  57
  58
  59 typedef union {
  60
  61         volatile uint8_t bytes[64];
  62         struct {
  63                 uint8_t status;  //1
  64                 int16_t temp;  //2
  65                 uint16_t voltage;  //4
  66                 uint16_t current;  //6
  67                 uint8_t threshold; //8
  68
  69                 uint8_t page1[8]; //9
  70                 uint8_t page2[8]; //17
  71                 uint8_t page3[8]; //25
  72                 uint8_t page4[8];  //33
  73                 uint8_t page5[8];  //41
  74                 uint8_t page6[8];  //49
  75                 uint8_t page7[8];  //57
  76                 //uint8_t crc;  //65
  77         };
  78 } pack_t;
  79 volatile pack_t pack;
  80
  81
  82 #define DDR_SENSOR   DDRA
  83 #define PORT_SENSOR  PORTA
  84 #define PIN_SENSOR   PINA
  85 #define SENSOR       PINA2
  86
  87 #define SENSOR_sda_out          DDR_SENSOR |= (1 << SENSOR)
  88 #define SENSOR_sda_in                   DDR_SENSOR &= ~(1 << SENSOR);PORT_SENSOR |= (1 << SENSOR) // release sda => hi in consequence of pullup
  89 #define SENSOR_sda_low    PORT_SENSOR &= ~(1 << SENSOR)
  90 #define SENSOR_is_hi                    PIN_SENSOR & (1 << SENSOR)
  91 #define SENSOR_is_low           !(PIN_SENSOR & (1 << SENSOR))
  92
  93 volatile int16_t am2302_temp;
  94 volatile uint16_t am2302_hum;
  95
  96
  97 uint8_t am_wait(uint8_t _time,uint8_t _signal){
  98         TCNT1=0;
  99         while(TCNT1==0);
 100         if (_signal)
 101         while((SENSOR_is_hi)&&(TCNT1<_time)) {}
 102         else
 103         while((SENSOR_is_low)&&(TCNT1<_time)) {}
 104
 105         if (TCNT1>=_time) {return 1;}
 106         return 0;
 107 }
 108
 109 volatile uint8_t am2302_mode=0;
 110 volatile uint8_t timeout=0;
 111
 112
 113
 114
 115
 116
 117 uint8_t userRegister[1];
 118 int16_t sRH,sT;
 119 volatile double temperatureC,humidityRH;
 120 volatile double l;
 121
 122 #if  defined(__AVR_ATtiny24__)||defined(__AVR_ATtiny44__)  || defined(__AVR_ATtiny84__) || defined(__AVR_ATtiny24A__)||defined(__AVR_ATtiny44A__)  || defined(__AVR_ATtiny84A__)
 123 ISR(WATCHDOG_vect) {
 124         #else
 125 ISR(WDT_vect) {
 126         #endif
 127         wdcounter++;
 128         if (reset_indicator==1) reset_indicator++;
 129         else if (reset_indicator==2) mode=0;
 130 }
 131
 132 int testSW(void) {
 133         uint8_t r;
 134         DDRB&=~(1<<PORTB0);  //Eingang
 135         __asm__ __volatile__ ("nop");
 136         PORTB|=(1<<PORTB0); //Pullup
 137         __asm__ __volatile__ ("nop");
 138         __asm__ __volatile__ ("nop");
 139         __asm__ __volatile__ ("nop");
 140         __asm__ __volatile__ ("nop");
 141         __asm__ __volatile__ ("nop");
 142         r=PINB&(1<<PORTB0);
 143         __asm__ __volatile__ ("nop");
 144         PORTB&=~(1<<PORTB0);
 145         __asm__ __volatile__ ("nop");
 146         DDRB|=(1<<PORTB0);  //Eingang
 147         return (r==0);
 148 }
 149
 150 uint8_t am2302() {
 151         int16_t lam2302_temp;
 152         uint16_t lam2302_hum;
 153         uint8_t rSREG;
 154         uint8_t sensor_data[5];
 155
 156         TCCR1B=(1<<CS11); //Clock/8 1µs
 157
 158         SENSOR_sda_out;
 159         SENSOR_sda_low; // MCU start signal
 160         TCNT1=0;while(TCNT1==0);while(TCNT1<250) {}// start signal (pull sda down for min 0.8ms and maximum 20ms)
 161         TCNT1=0;while(TCNT1==0);while(TCNT1<250) {}// start signal (pull sda down for min 0.8ms and maximum 20ms)
 162         SENSOR_sda_in;
 163         if (am_wait(200,1)) return 2;
 164
 165         // AM2302 response signal min: 75us typ:80us max:85us or 500us different types
 166         if (am_wait(100,0)) return 3;
 167         if (am_wait(100,1)) return 4;
 168
 169         for(uint8_t i = 0; i < 5; i++)  {
 170                 uint8_t sensor_byte = 0;
 171                 for(uint8_t j = 1; j <= 8; j++) {// get 8 bits from sensor
 172                         if (am_wait(88,0)) return 5;
 173
 174                         TCNT1=0;while(TCNT1==0);;while(TCNT1<35)                ;
 175                         sensor_byte <<= 1; // add new lower byte
 176                         if (SENSOR_is_hi) {// if sda high after 30us => bit=1 else bit=0
 177                                 sensor_byte |= 1;
 178                                 if (am_wait(45,1)) return 6;// 30us - 75us = 45us
 179                         }
 180                 }
 181                 sensor_data[i] = sensor_byte;
 182         }
 183
 184         // checksum
 185         if ( ((sensor_data[0]+sensor_data[1]+sensor_data[2]+sensor_data[3]) & 0xff ) != sensor_data[4])
 186         {
 187                 PORTB&=~(1<<PINB0);
 188                 return 7;
 189         }
 190         if (sensor_data[2]&0x80) { //minus
 191                 sensor_data[2]&=~(0x80);
 192                 lam2302_temp=-((sensor_data[2]<<8) + sensor_data[3]);
 193         } else
 194                 lam2302_temp=((sensor_data[2]<<8) + sensor_data[3]);
 195         if (!testSW()) {
 196                 double htemp=lam2302_temp;
 197         double hhum=(1.0546-0.000216*htemp)*((sensor_data[0]<<8) + sensor_data[1]);
 198                 //htemp=Temperauter * 10
 199                 //lam2302_hum=0.318*hhum +76;
 200                 lam2302_hum=0.31*hhum +80; //hhum = Hum*10 -> 5V also all *5
 201                 config_info[5]=7;
 202         }
 203         else {
 204
 205                 lam2302_hum=((sensor_data[0]<<8) + sensor_data[1]);
 206                 config_info[5]=12;
 207         }
 208         lam2302_temp=lam2302_temp*25.6;
 209         rSREG=SREG;
 210         cli();
 211         am2302_hum=lam2302_hum;
 212         am2302_temp=lam2302_temp;
 213         SREG=rSREG;
 214         return 0;
 215 }
 216
 217
 218
 219
 220
 221
 222
 223
 224         int main(void){
 225                 PRR|=(1<<PRUSI)|(1<<PRADC);   // adc and usi for save Power
 226                 PORTA=0xFF;
 227                 PORTB=0xFF-(1<<PORTB0); //Schalter kann gegen Masse sein und zieht dann immer Strom
 228                 DDRB|=(1<<PORTB0); //Als Ausgang und 0
 229
 230
 231                 OWINIT();
 232
 233                 ACSR|=(1<<ACD);  //Disable Comparator
 234                 ADCSRB|=(1<<ACME); //Disable Analog multiplexer
 235                 MCUCR &=~(1<<PUD); //All Pins Pullup...
 236                 MCUCR |=(1<<BODS);
 237
 238
 239                 DDRA|=(1<<PINA1); //stromversorgung
 240 #define SENSON PORTA|=(1<<PINA1);
 241 #define SENSOFF PORTA&=~(1<<PINA1);
 242
 243                 // Set up Watch Dog Timer for Inactivity
 244                 WDTCSR |= (1<<WDCE) ;   // Enable the WD Change Bit
 245                 WDTCSR =   (1<<WDIE) |              // Enable WDT Interrupt
 246                         (1<<WDP2) | (1<<WDP1);   // Set Timeout to ~2 seconds
 247
 248                 if (testSW()) {
 249                         config_info[5]=12;  //hum *10
 250                         }else{
 251                         config_info[5]=7; //HIH4031
 252                 }
 253
 254                 uint8_t i;
 255                 for(i=0;i<64;i++) pack.bytes[i]=0;
 256                 MCUSR=0;
 257
 258                 uint8_t err;
 259                 uint8_t pn=1;
 260                 SENSON
 261                 _delay_ms(4000);
 262                 err =am2302();
 263
 264                 sei();
 265
 266                 while(1)   {
 267                         if (gcontrol) {
 268                                 if (wdcounter>2) {
 269                                         wdcounter=0;
 270                                         SENSON
 271                                 }
 272                                 gcontrol=0;
 273                         }
 274                         if (wdcounter==2) {
 275                                 err=am2302();
 276                                 if (err!=0) {
 277                                         pack.page3[pn]=err;
 278                                         pn=pn+1;if (pn>31) pn=1;
 279                                 }
 280                                 SENSOFF
 281                                 wdcounter=3;
 282                         }
 283                         if (wdcounter>=16) {
 284                                 wdcounter=0;
 285                                 SENSON
 286                         }
 287
 288
 289
 290                         if (((TIMSK0 & (1<<TOIE0))==0)&& (mode==0))       {
 291                                 MCUCR|=(1<<SE)|(1<<SM1);
 292                                 MCUCR&=~(1<<ISC01);
 293                                 } else {
 294                                 MCUCR|=(1<<SE);
 295                                 MCUCR&=~(1<<SM1);
 296                         }
 297                         asm("SLEEP");
 298                 }
 299
 300
 301         }