Rev 2751 Rev 2834
1 #include "1wire.c" 1 #include "1wire.c"
2   2  
-   3 // compute CRC
-   4 // *sn - pointer to the byte array
-   5 // num - length of array
-   6 inline int8 TM_check_CRC(unsigned int8 *sn, unsigned int8 num)
-   7 {
-   8 // CRC table
-   9 const int8 TouchCRC[256]= {
-   10 0, 94, 188, 226, 97, 63, 221, 131, 194, 156, 126, 32, 163, 253, 31, 65,
-   11 157, 195, 33, 127, 252, 162, 64, 30, 95, 1, 227, 189, 62, 96, 130, 220,
-   12 35, 125, 159, 193, 66, 28, 254, 160, 225, 191, 93, 3, 128, 222, 60, 98,
-   13 190, 224, 2, 92, 223, 129, 99, 61, 124, 34, 192, 158, 29, 67, 161, 255,
-   14 70, 24, 250, 164, 39, 121, 155, 197, 132, 218, 56, 102, 229, 187, 89, 7,
-   15 219, 133, 103, 57, 186, 228, 6, 88, 25, 71, 165, 251, 120, 38, 196, 154,
-   16 101, 59, 217, 135, 4, 90, 184, 230, 167, 249, 27, 69, 198, 152, 122, 36,
-   17 248, 166, 68, 26, 153, 199, 37, 123, 58, 100, 134, 216, 91, 5, 231, 185,
-   18 140, 210, 48, 110, 237, 179, 81, 15, 78, 16, 242, 172, 47, 113, 147, 205,
-   19 17, 79, 173, 243, 112, 46, 204, 146, 211, 141, 111, 49, 178, 236, 14, 80,
-   20 175, 241, 19, 77, 206, 144, 114, 44, 109, 51, 209, 143, 12, 82, 176, 238,
-   21 50, 108, 142, 208, 83, 13, 239, 177, 240, 174, 76, 18, 145, 207, 45, 115,
-   22 202, 148, 118, 40, 171, 245, 23, 73, 8, 86, 180, 234, 105, 55, 213, 139,
-   23 87, 9, 235, 181, 54, 104, 138, 212, 149, 203, 41, 119, 244, 170, 72, 22,
-   24 233, 183, 85, 11, 136, 214, 52, 106, 43, 117, 151, 201, 74, 20, 246, 168,
-   25 116, 42, 200, 150, 21, 75, 169, 247, 182, 232, 10, 84, 215, 137, 107, 53};
-   26  
-   27 int8 CRC;
-   28 int8 i;
-   29  
-   30 CRC=0;
-   31 for(i=0;i<num;i++) CRC=TouchCRC[CRC ^ *(sn+i)];
-   32 return(CRC);
-   33 }
-   34  
-   35  
3 float ds1820_read() 36 float ds1820_read()
4 { 37 {
5 int8 busy=0, temp1, temp2; 38 unsigned int1 busy=0;
-   39 int8 SN[10];
6 signed int16 temp3; 40 unsigned int8 n;
7 float result; 41 float result;
8   42  
9 onewire_reset(); 43 onewire_reset();
10 onewire_write(0xCC); 44 onewire_write(0xCC);
11 onewire_write(0x44); 45 onewire_write(0x44);
12   46  
13 while (busy == 0) busy = onewire_read(); 47 while (busy == 0) busy = onewire_read();
14   48  
15 onewire_reset(); 49 onewire_reset();
16 onewire_write(0xCC); 50 onewire_write(0xCC);
17 onewire_write(0xBE); 51 onewire_write(0xBE);
18 temp1 = onewire_read(); -  
19 temp2 = onewire_read(); -  
20 temp3 = make16(temp2, temp1); -  
21   -  
22 result = (float) temp3 / 16.0; //calculation pro DS18B20 with 0.1 deg C -  
23   52  
-   53 for(n=0;n<9;n++) SN[n]=onewire_read();
-   54 if ((SN[8]==TM_check_CRC(SN,8))&&(SN[7]==0x10)) // Check CRC and family code to prevent O's error
-   55 {
-   56 result=make16(SN[1],SN[0]);
-   57 result=result*6+result/4; // 1bit = 0,0625gradC recalculate to 1/100gradC
-   58 }
-   59 else
-   60 {
-   61 result=-273.15;
-   62 }
24 return(result); 63 return(result);
25 } 64 }