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