{"id":1283,"date":"2022-10-19T12:26:47","date_gmt":"2022-10-19T11:26:47","guid":{"rendered":"https:\/\/ibex.tech\/programming\/?p=1283"},"modified":"2022-10-19T12:28:03","modified_gmt":"2022-10-19T11:28:03","slug":"crc8","status":"publish","type":"post","link":"https:\/\/ibex.tech\/programming\/communications\/crc\/crc8","title":{"rendered":"CRC8"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\">Calculating CRC8<\/h4>\n\n\n\n<pre class=\"wp-block-code\"><code>static uint8_t Crc8Table&#91;] = {\r\n\t0x00, 0x07, 0x0e, 0x09, 0x1c, 0x1b, 0x12, 0x15,\r\n\t0x38, 0x3f, 0x36, 0x31, 0x24, 0x23, 0x2a, 0x2d,\r\n\t0x70, 0x77, 0x7e, 0x79, 0x6c, 0x6b, 0x62, 0x65,\r\n\t0x48, 0x4f, 0x46, 0x41, 0x54, 0x53, 0x5a, 0x5d,\r\n\t0xe0, 0xe7, 0xee, 0xe9, 0xfc, 0xfb, 0xf2, 0xf5,\r\n\t0xd8, 0xdf, 0xd6, 0xd1, 0xc4, 0xc3, 0xca, 0xcd,\r\n\t0x90, 0x97, 0x9e, 0x99, 0x8c, 0x8b, 0x82, 0x85,\r\n\t0xa8, 0xaf, 0xa6, 0xa1, 0xb4, 0xb3, 0xba, 0xbd,\r\n\t0xc7, 0xc0, 0xc9, 0xce, 0xdb, 0xdc, 0xd5, 0xd2,\r\n\t0xff, 0xf8, 0xf1, 0xf6, 0xe3, 0xe4, 0xed, 0xea,\r\n\t0xb7, 0xb0, 0xb9, 0xbe, 0xab, 0xac, 0xa5, 0xa2,\r\n\t0x8f, 0x88, 0x81, 0x86, 0x93, 0x94, 0x9d, 0x9a,\r\n\t0x27, 0x20, 0x29, 0x2e, 0x3b, 0x3c, 0x35, 0x32,\r\n\t0x1f, 0x18, 0x11, 0x16, 0x03, 0x04, 0x0d, 0x0a,\r\n\t0x57, 0x50, 0x59, 0x5e, 0x4b, 0x4c, 0x45, 0x42,\r\n\t0x6f, 0x68, 0x61, 0x66, 0x73, 0x74, 0x7d, 0x7a,\r\n\t0x89, 0x8e, 0x87, 0x80, 0x95, 0x92, 0x9b, 0x9c,\r\n\t0xb1, 0xb6, 0xbf, 0xb8, 0xad, 0xaa, 0xa3, 0xa4,\r\n\t0xf9, 0xfe, 0xf7, 0xf0, 0xe5, 0xe2, 0xeb, 0xec,\r\n\t0xc1, 0xc6, 0xcf, 0xc8, 0xdd, 0xda, 0xd3, 0xd4,\r\n\t0x69, 0x6e, 0x67, 0x60, 0x75, 0x72, 0x7b, 0x7c,\r\n\t0x51, 0x56, 0x5f, 0x58, 0x4d, 0x4a, 0x43, 0x44,\r\n\t0x19, 0x1e, 0x17, 0x10, 0x05, 0x02, 0x0b, 0x0c,\r\n\t0x21, 0x26, 0x2f, 0x28, 0x3d, 0x3a, 0x33, 0x34,\r\n\t0x4e, 0x49, 0x40, 0x47, 0x52, 0x55, 0x5c, 0x5b,\r\n\t0x76, 0x71, 0x78, 0x7f, 0x6a, 0x6d, 0x64, 0x63,\r\n\t0x3e, 0x39, 0x30, 0x37, 0x22, 0x25, 0x2c, 0x2b,\r\n\t0x06, 0x01, 0x08, 0x0f, 0x1a, 0x1d, 0x14, 0x13,\r\n\t0xae, 0xa9, 0xa0, 0xa7, 0xb2, 0xb5, 0xbc, 0xbb,\r\n\t0x96, 0x91, 0x98, 0x9f, 0x8a, 0x8d, 0x84, 0x83,\r\n\t0xde, 0xd9, 0xd0, 0xd7, 0xc2, 0xc5, 0xcc, 0xcb,\r\n\t0xe6, 0xe1, 0xe8, 0xef, 0xfa, 0xfd, 0xf4, 0xf3\r\n};\n\n\/\/************************************\n\/\/************************************\n\/\/********** CALCULATE CRC8 **********\n\/\/************************************\n\/\/************************************\nuint8_t CalculateCrc8(uint8_t *Buffer, int Length)\n{\n\tuint8_t CrcValue;\t\t\t\/\/&lt;&lt;CRC Start Value\n\tuint8_t BufferIndex = 0;\n\n\twhile (Length--)\n\t{\n\t\tCrcValue = Crc8Table&#91;Buffer&#91;BufferIndex++] ^ CrcValue];\n\t}\n\n\treturn(CrcValue);\n}\n\n\n\/\/*************************************************\n\/\/*************************************************\n\/\/********** CRC CALCULATED BYTE BY BYTE **********\n\/\/*************************************************\n\/\/*************************************************\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.\n\/* Usage:\n\tstatic uint8_t CrcValue = 0;\t\t\t\/\/&lt;&lt;CRC Start Value\n\tuint8_t NewDataByte;\n\n\tfor (...)\n\t{\n\t\tNewDataByte = ...;\n\t\tCrcValue = UpdateCrc8(CrcValue, NewDataByte);\n\t}\n*\/\nuint8_t UpdateCrc8(uint8_t PreviousCrcValue, uint8_t NewDataByte)\n{\n\treturn Crc8Table&#91;NewDataByte ^ PreviousCrcValue];\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Calculating CRC8<\/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-1283","post","type-post","status-publish","format-standard","hentry","category-crc"],"_links":{"self":[{"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts\/1283","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=1283"}],"version-history":[{"count":3,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts\/1283\/revisions"}],"predecessor-version":[{"id":1289,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/posts\/1283\/revisions\/1289"}],"wp:attachment":[{"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/media?parent=1283"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/categories?post=1283"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ibex.tech\/programming\/wp-json\/wp\/v2\/tags?post=1283"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}