{"id":1286,"date":"2022-10-19T12:27:22","date_gmt":"2022-10-19T11:27:22","guid":{"rendered":"https:\/\/ibex.tech\/programming\/?p=1286"},"modified":"2022-10-19T12:27:22","modified_gmt":"2022-10-19T11:27:22","slug":"crc16","status":"publish","type":"post","link":"https:\/\/ibex.tech\/programming\/communications\/crc\/crc16","title":{"rendered":"CRC16"},"content":{"rendered":"\n

Calculating CRC16<\/h4>\n\n\n\n
uint16_t Crc16Table[] = {\r\n\t0x0000, 0xC0C1, 0xC181, 0x0140, 0xC301, 0x03C0, 0x0280, 0xC241,\r\n\t0xC601, 0x06C0, 0x0780, 0xC741, 0x0500, 0xC5C1, 0xC481, 0x0440,\r\n\t0xCC01, 0x0CC0, 0x0D80, 0xCD41, 0x0F00, 0xCFC1, 0xCE81, 0x0E40,\r\n\t0x0A00, 0xCAC1, 0xCB81, 0x0B40, 0xC901, 0x09C0, 0x0880, 0xC841,\r\n\t0xD801, 0x18C0, 0x1980, 0xD941, 0x1B00, 0xDBC1, 0xDA81, 0x1A40,\r\n\t0x1E00, 0xDEC1, 0xDF81, 0x1F40, 0xDD01, 0x1DC0, 0x1C80, 0xDC41,\r\n\t0x1400, 0xD4C1, 0xD581, 0x1540, 0xD701, 0x17C0, 0x1680, 0xD641,\r\n\t0xD201, 0x12C0, 0x1380, 0xD341, 0x1100, 0xD1C1, 0xD081, 0x1040,\r\n\t0xF001, 0x30C0, 0x3180, 0xF141, 0x3300, 0xF3C1, 0xF281, 0x3240,\r\n\t0x3600, 0xF6C1, 0xF781, 0x3740, 0xF501, 0x35C0, 0x3480, 0xF441,\r\n\t0x3C00, 0xFCC1, 0xFD81, 0x3D40, 0xFF01, 0x3FC0, 0x3E80, 0xFE41,\r\n\t0xFA01, 0x3AC0, 0x3B80, 0xFB41, 0x3900, 0xF9C1, 0xF881, 0x3840,\r\n\t0x2800, 0xE8C1, 0xE981, 0x2940, 0xEB01, 0x2BC0, 0x2A80, 0xEA41,\r\n\t0xEE01, 0x2EC0, 0x2F80, 0xEF41, 0x2D00, 0xEDC1, 0xEC81, 0x2C40,\r\n\t0xE401, 0x24C0, 0x2580, 0xE541, 0x2700, 0xE7C1, 0xE681, 0x2640,\r\n\t0x2200, 0xE2C1, 0xE381, 0x2340, 0xE101, 0x21C0, 0x2080, 0xE041,\r\n\t0xA001, 0x60C0, 0x6180, 0xA141, 0x6300, 0xA3C1, 0xA281, 0x6240,\r\n\t0x6600, 0xA6C1, 0xA781, 0x6740, 0xA501, 0x65C0, 0x6480, 0xA441,\r\n\t0x6C00, 0xACC1, 0xAD81, 0x6D40, 0xAF01, 0x6FC0, 0x6E80, 0xAE41,\r\n\t0xAA01, 0x6AC0, 0x6B80, 0xAB41, 0x6900, 0xA9C1, 0xA881, 0x6840,\r\n\t0x7800, 0xB8C1, 0xB981, 0x7940, 0xBB01, 0x7BC0, 0x7A80, 0xBA41,\r\n\t0xBE01, 0x7EC0, 0x7F80, 0xBF41, 0x7D00, 0xBDC1, 0xBC81, 0x7C40,\r\n\t0xB401, 0x74C0, 0x7580, 0xB541, 0x7700, 0xB7C1, 0xB681, 0x7640,\r\n\t0x7200, 0xB2C1, 0xB381, 0x7340, 0xB101, 0x71C0, 0x7080, 0xB041,\r\n\t0x5000, 0x90C1, 0x9181, 0x5140, 0x9301, 0x53C0, 0x5280, 0x9241,\r\n\t0x9601, 0x56C0, 0x5780, 0x9741, 0x5500, 0x95C1, 0x9481, 0x5440,\r\n\t0x9C01, 0x5CC0, 0x5D80, 0x9D41, 0x5F00, 0x9FC1, 0x9E81, 0x5E40,\r\n\t0x5A00, 0x9AC1, 0x9B81, 0x5B40, 0x9901, 0x59C0, 0x5880, 0x9841,\r\n\t0x8801, 0x48C0, 0x4980, 0x8941, 0x4B00, 0x8BC1, 0x8A81, 0x4A40,\r\n\t0x4E00, 0x8EC1, 0x8F81, 0x4F40, 0x8D01, 0x4DC0, 0x4C80, 0x8C41,\r\n\t0x4400, 0x84C1, 0x8581, 0x4540, 0x8701, 0x47C0, 0x4680, 0x8641,\r\n\t0x8201, 0x42C0, 0x4380, 0x8341, 0x4100, 0x81C1, 0x8081, 0x4040\r\n};\r\n\r\n\t\r\n\/\/##### C VERSION #####\r\n\/\/*************************************\r\n\/\/*************************************\r\n\/\/********** CALCULATE CRC16 **********\r\n\/\/*************************************\r\n\/\/*************************************\r\nuint16_t CalculateCRC16(uint8_t *Buffer, int Length)\r\n{\r\n\tuint8_t TempByte;\r\n\tuint16_t CrcValue = 0xFFFF;\t\t\t\t\/\/<<CRC Start Value\r\n\tint BufferIndex = 0;\r\n\r\n\twhile (Length--)\r\n\t{\r\n\t\tTempByte = Buffer[BufferIndex++] ^ (CrcValue & 0x00ff);\r\n\t\tCrcValue >>= 8;\r\n\t\tCrcValue ^= Crc16Table[TempByte];\r\n\t}\r\n\treturn(CrcValue);\r\n}\r\n\r\n\/\/*************************************************\r\n\/\/*************************************************\r\n\/\/********** CRC CALCULATED BYTE BY BYTE **********\r\n\/\/*************************************************\r\n\/\/*************************************************\r\n\/\/Given a databyte and the previous value of the CRC value, this function calculates and returns the new actual CRC value of the data comming in.\r\n\/* Usage:\r\n\tstatic uint16_t CrcValue = 0;\t\t\t\t\/\/<<CRC Start Value\r\n\tuint8_t NewDataByte;\r\n\r\n\tfor (...)\r\n\t{\r\n\t\tNewDataByte = ...;\r\n\t\tCrcValue = UpdateCrc8(CrcValue, NewDataByte);\r\n\t}\r\n*\/\r\nuint16_t UpdateCrc16(uint16_t PreviousCrcValue, uint8_t NewDataByte)\r\n{\r\n\tuint8_t TempByte;\r\n\r\n\tTempByte = NewDataByte ^ (PreviousCrcValue & 0x00ff);\r\n\tPreviousCrcValue >>= 8;\r\n\treturn(PreviousCrcValue ^= Crc16Table[TempByte]);\r\n}\r\n\r\n\/*\r\n\/\/##### C# VERSION #####\r\n\/\/*************************************\r\n\/\/*************************************\r\n\/\/********** CALCULATE CRC16 **********\r\n\/\/*************************************\r\n\/\/*************************************\r\nUInt16 CalculateCRC16 (array<uint8_t> ^Buffer, int Length)\r\n{\r\n\tuint8_t TempByte;\r\n\tuint16_t CrcValue = 0xFFFF;\t\t\t\t\/\/<<CRC Start Value\r\n\tint BufferIndex = 0;\r\n\r\n\twhile (Length--)\r\n\t{\r\n\t\tTempByte = Buffer[BufferIndex++] ^ Convert::ToByte(CrcValue & 0x00ff);\r\n\t\tCrcValue >>= 8;\r\n\t\tCrcValue ^= Crc16Table[TempByte];\r\n\t}\r\n\treturn(CrcValue);\r\n}\r\n*\/<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
Calculating CRC16<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[103],"tags":[],"class_list":["post-1286","post","type-post","status-publish","format-standard","hentry","category-crc"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts\/1286","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/comments?post=1286"}],"version-history":[{"count":1,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts\/1286\/revisions"}],"predecessor-version":[{"id":1287,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts\/1286\/revisions\/1287"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/media?parent=1286"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/categories?post=1286"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/tags?post=1286"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}