Dependencies: ChaNFSSD mbed BMP085 SHT2x
modbus_crc.c@4:879b8dcfee15, 2012-02-04 (annotated)
- Committer:
- tosihisa
- Date:
- Sat Feb 04 17:01:17 2012 +0000
- Revision:
- 4:879b8dcfee15
- Parent:
- 1:83960ee4d9a2
V0.81
Who changed what in which revision?
User | Revision | Line number | New contents of line |
---|---|---|---|
tosihisa | 1:83960ee4d9a2 | 1 | /* |
tosihisa | 1:83960ee4d9a2 | 2 | * Copyright (c) 2011 Toshihisa T |
tosihisa | 1:83960ee4d9a2 | 3 | * Released under the MIT License: http://mbed.org/license/mit |
tosihisa | 1:83960ee4d9a2 | 4 | */ |
tosihisa | 0:6089ae824f06 | 5 | |
tosihisa | 0:6089ae824f06 | 6 | static const unsigned short _modbus_CRCTab[256] = { |
tosihisa | 0:6089ae824f06 | 7 | 0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241, /* 0x00-0x07 */ |
tosihisa | 0:6089ae824f06 | 8 | 0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440, /* 0x08-0x0F */ |
tosihisa | 0:6089ae824f06 | 9 | 0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40, |
tosihisa | 0:6089ae824f06 | 10 | 0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841, |
tosihisa | 0:6089ae824f06 | 11 | 0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40, |
tosihisa | 0:6089ae824f06 | 12 | 0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41, |
tosihisa | 0:6089ae824f06 | 13 | 0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641, |
tosihisa | 0:6089ae824f06 | 14 | 0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040, |
tosihisa | 0:6089ae824f06 | 15 | 0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240, |
tosihisa | 0:6089ae824f06 | 16 | 0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441, |
tosihisa | 0:6089ae824f06 | 17 | 0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41, |
tosihisa | 0:6089ae824f06 | 18 | 0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840, |
tosihisa | 0:6089ae824f06 | 19 | 0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41, |
tosihisa | 0:6089ae824f06 | 20 | 0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40, |
tosihisa | 0:6089ae824f06 | 21 | 0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640, |
tosihisa | 0:6089ae824f06 | 22 | 0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041, |
tosihisa | 0:6089ae824f06 | 23 | 0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240, |
tosihisa | 0:6089ae824f06 | 24 | 0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441, |
tosihisa | 0:6089ae824f06 | 25 | 0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41, |
tosihisa | 0:6089ae824f06 | 26 | 0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840, |
tosihisa | 0:6089ae824f06 | 27 | 0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41, |
tosihisa | 0:6089ae824f06 | 28 | 0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40, |
tosihisa | 0:6089ae824f06 | 29 | 0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640, |
tosihisa | 0:6089ae824f06 | 30 | 0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041, |
tosihisa | 0:6089ae824f06 | 31 | 0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241, |
tosihisa | 0:6089ae824f06 | 32 | 0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440, |
tosihisa | 0:6089ae824f06 | 33 | 0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40, |
tosihisa | 0:6089ae824f06 | 34 | 0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841, |
tosihisa | 0:6089ae824f06 | 35 | 0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40, |
tosihisa | 0:6089ae824f06 | 36 | 0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41, |
tosihisa | 0:6089ae824f06 | 37 | 0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641, |
tosihisa | 0:6089ae824f06 | 38 | 0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040 |
tosihisa | 0:6089ae824f06 | 39 | }; |
tosihisa | 0:6089ae824f06 | 40 | |
tosihisa | 0:6089ae824f06 | 41 | unsigned short modbus_CRC(unsigned char *DataPtr, unsigned short len) |
tosihisa | 0:6089ae824f06 | 42 | { |
tosihisa | 0:6089ae824f06 | 43 | unsigned char Temp; |
tosihisa | 0:6089ae824f06 | 44 | unsigned short retval = 0xFFFF; |
tosihisa | 0:6089ae824f06 | 45 | while(len--){ |
tosihisa | 0:6089ae824f06 | 46 | Temp = *DataPtr++ ^ retval; |
tosihisa | 0:6089ae824f06 | 47 | retval >>= 8; |
tosihisa | 0:6089ae824f06 | 48 | retval ^= _modbus_CRCTab[Temp]; |
tosihisa | 0:6089ae824f06 | 49 | } |
tosihisa | 0:6089ae824f06 | 50 | return retval; |
tosihisa | 0:6089ae824f06 | 51 | } |
tosihisa | 0:6089ae824f06 | 52 | |
tosihisa | 0:6089ae824f06 | 53 | #ifdef __SELFTEST__ |
tosihisa | 0:6089ae824f06 | 54 | #include <stdio.h> |
tosihisa | 0:6089ae824f06 | 55 | |
tosihisa | 0:6089ae824f06 | 56 | int main(void) |
tosihisa | 0:6089ae824f06 | 57 | { |
tosihisa | 0:6089ae824f06 | 58 | unsigned char testbuf[] = { 0xFE, 0x04, 0x00, 0x03, 0x00, 0x01, /* 0xD5, 0xC5 */ }; |
tosihisa | 0:6089ae824f06 | 59 | unsigned short calc_crc = 0; |
tosihisa | 0:6089ae824f06 | 60 | |
tosihisa | 0:6089ae824f06 | 61 | calc_crc = modbus_CRC(testbuf,sizeof(testbuf)); |
tosihisa | 0:6089ae824f06 | 62 | printf("CRC:0x%04x\n",calc_crc); |
tosihisa | 0:6089ae824f06 | 63 | |
tosihisa | 4:879b8dcfee15 | 64 | /* modbus crc16 �́A���o�C�g���瑗�M���ç·�� */ |
tosihisa | 0:6089ae824f06 | 65 | return 0; |
tosihisa | 0:6089ae824f06 | 66 | } |
tosihisa | 0:6089ae824f06 | 67 | |
tosihisa | 0:6089ae824f06 | 68 | #endif |
tosihisa | 0:6089ae824f06 | 69 | |
tosihisa | 0:6089ae824f06 | 70 |