DS2438_DHT22/DS2438_DHT22.c

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