added guhRF; added atmega256rfr2 support

platform/RaspBee/dev/dht11.c

@@ -0,0 +1,125 @@
+/*
+ DHT-11 Library
+ (c) Created by Charalampos Andrianakis on 18/12/11.
+ 
+ Permission is hereby granted, free of charge, to any person obtaining a copy
+ of this software and associated documentation 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
+ furnished 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 FOR 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 <avr/io.h>
+#include "contiki.h"
+#include "dht11.h"
+#include "led.h" // debug
+
+#define udelay(u) clock_delay_usec(u)
+#define mdelay(u) clock_delay_msec(u)
+
+// todo: set DHT22 or DHT11 in project file
+// define for DHT11 else for DHT22, RHT03 
+//   #define DHT11	1
+
+uint8_t DHT_Read_Data(uint16_t *temperature, uint16_t *humidity){
+
+    //data[5] is 8byte table where data come from DHT are stored
+    //laststate holds laststate value
+    //counter is used to count microSeconds
+    uint8_t data[5], laststate = 0, counter = 0, j = 0, i = 0;
+    
+    //Clear array
+    data[0] = data[1] = data[2] = data[3] = data[4] = 0;
+
+    uint8_t volatile sreg;
+    sreg = SREG;    /* Save status register before disabling interrupts. */
+    cli();          /* Disable interrupts. */
+
+    //Set pin Output
+    //Pin High
+    DHT_DRIVE();
+    mdelay(100);                     //Wait for 100mS
+    
+    //Send Request Signal
+    //Pin Low
+    OUTP_0();                      //20ms Low 
+    mdelay(20);
+    //Pin High
+    OUTP_1();
+    udelay(40);                      //40us High
+    
+    //Set pin Input to read Bus
+    //Set pin Input
+    DHT_RELEASE();
+    laststate=DHT_INP();             //Read Pin value
+    
+    //Repeat for each Transistions
+    for (i=0; i<MAXTIMINGS; i++) {
+        //While state is the same count microseconds
+   //led1_on();
+   //led1_off();
+ 
+       while (laststate==DHT_INP()) {
+            udelay(1);
+            counter++;
+            if (counter>254) break;
+        }
+
+        if (counter>254) break;
+        
+        //laststate==_BV(DHT_PIN) checks if laststate was High
+        //ignore the first 2 transitions which are the DHT Response
+        //if (laststate==_BV(DHT_PIN) && (i > 2)) {
+        if ((i&0x01) && (i > 2)) {
+            //Save bits in segments of bytes
+            //Shift data[] value 1 position left
+            //Example. 01010100 if we shift it left one time it will be
+            //10101000
+ 
+            data[j/8]<<=1;
+            if (counter >= 15) {    //If it was high for more than 40uS
+   //led1_on();
+                data[j/8]|=1;       //it means it is bit '1' so make a logic
+   //led1_off();
+            }                       //OR with the value (save it)
+            j++;                    //making an OR by 1 to this value 10101000
+        }                           //we will have the resault 10101001
+                                    //1 in 8-bit binary is 00000001
+        //j/8 changes table record every 8 bits which means a byte has been saved
+        //so change to next record. 0/8=0 1/8=0 ... 7/8=0 8/8=1 ... 15/8=1 16/8=2
+        laststate=DHT_INP();     //save current state
+        counter=0;                  //reset counter
+        
+    }
+    SREG = sreg;    /* Enable interrupts. */
+    //printf("HUM %d %d %d %d %d %d",data[0],data[1],data[2],data[3],data[4],(uint8_t)(data[0] + data[1] + data[2] + data[3]) );
+    //Check if data received are correct by checking the CheckSum
+    if ((uint8_t)(data[0] + data[1] + data[2] + data[3]) == data[4]) {
+#ifdef DHT11
+        *humidity = data[0]*100;
+        *temperature = data[2]*100;
+#else
+        *humidity = ((uint16_t)data[0]<<8 | data[1])*10;
+        *temperature = ((uint16_t)data[2]<<8 | data[3])*10;
+#endif
+        return 0;
+    }else{
+        *humidity = 2;
+        *temperature = 2;
+//        uart_puts("\r\nCheck Sum Error");
+    }
+ 
+     return 0xff;  // Check Sum Error
+}