Option Explicit' Evalutate the 16-bit CRC (Cyclic Redundancy Checksum) of an array of bytes'' If you omit the second argument, the entire array is consideredFunction Crc16(cp() As Byte, Optional ByVal Size As Long = -1) As Long Dim i As Long Dim fcs As Long Static fcstab(255) As Long Const pppinitfcs16 = &HFFFF& 'Initial FCS value If Size < 0 Then Size = UBound(cp) - LBound(cp) + 1 If fcstab(1) = 0 Then ' Initialize array once and for all fcstab(0) = &H0& fcstab(1) = &H1189& fcstab(2) = &H2312& fcstab(3) = &H329B& fcstab(4) = &H4624& fcstab(5) = &H57AD& fcstab(6) = &H6536& fcstab(7) = &H74BF& fcstab(8) = &H8C48& fcstab(9) = &H9DC1& fcstab(10) = &HAF5A& fcstab(11) = &HBED3& fcstab(12) = &HCA6C& fcstab(13) = &HDBE5& fcstab(14) = &HE97E& fcstab(15) = &HF8F7& fcstab(16) = &H1081& fcstab(17) = &H108& fcstab(18) = &H3393& fcstab(19) = &H221A& fcstab(20) = &H56A5& fcstab(21) = &H472C& fcstab(22) = &H75B7& fcstab(23) = &H643E& fcstab(24) = &H9CC9& fcstab(25) = &H8D40& fcstab(26) = &HBFDB& fcstab(27) = &HAE52& fcstab(28) = &HDAED& fcstab(29) = &HCB64& fcstab(30) = &HF9FF& fcstab(31) = &HE876& fcstab(32) = &H2102& fcstab(33) = &H308B& fcstab(34) = &H210& fcstab(35) = &H1399& fcstab(36) = &H6726& fcstab(37) = &H76AF& fcstab(38) = &H4434& fcstab(39) = &H55BD& fcstab(40) = &HAD4A& fcstab(41) = &HBCC3& fcstab(42) = &H8E58& fcstab(43) = &H9FD1& fcstab(44) = &HEB6E& fcstab(45) = &HFAE7& fcstab(46) = &HC87C& fcstab(47) = &HD9F5& fcstab(48) = &H3183& fcstab(49) = &H200A& fcstab(50) = &H1291& fcstab(51) = &H318& fcstab(52) = &H77A7& fcstab(53) = &H662E& fcstab(54) = &H54B5& fcstab(55) = &H453C& fcstab(56) = &HBDCB& fcstab(57) = &HAC42& fcstab(58) = &H9ED9& fcstab(59) = &H8F50& fcstab(60) = &HFBEF& fcstab(61) = &HEA66& fcstab(62) = &HD8FD& fcstab(63) = &HC974& fcstab(64) = &H4204& fcstab(65) = &H538D& fcstab(66) = &H6116& fcstab(67) = &H709F& fcstab(68) = &H420& fcstab(69) = &H15A9& fcstab(70) = &H2732& fcstab(71) = &H36BB& fcstab(72) = &HCE4C& fcstab(73) = &HDFC5& fcstab(74) = &HED5E& fcstab(75) = &HFCD7& fcstab(76) = &H8868& fcstab(77) = &H99E1& fcstab(78) = &HAB7A& fcstab(79) = &HBAF3& fcstab(80) = &H5285& fcstab(81) = &H430C& fcstab(82) = &H7197& fcstab(83) = &H601E& fcstab(84) = &H14A1& fcstab(85) = &H528& fcstab(86) = &H37B3& fcstab(87) = &H263A& fcstab(88) = &HDECD& fcstab(89) = &HCF44& fcstab(90) = &HFDDF& fcstab(91) = &HEC56& fcstab(92) = &H98E9& fcstab(93) = &H8960& fcstab(94) = &HBBFB& fcstab(95) = &HAA72& fcstab(96) = &H6306& fcstab(97) = &H728F& fcstab(98) = &H4014& fcstab(99) = &H519D& fcstab(100) = &H2522& fcstab(101) = &H34AB& fcstab(102) = &H630& fcstab(103) = &H17B9& fcstab(104) = &HEF4E& fcstab(105) = &HFEC7& fcstab(106) = &HCC5C& fcstab(107) = &HDDD5& fcstab(108) = &HA96A& fcstab(109) = &HB8E3& fcstab(110) = &H8A78& fcstab(111) = &H9BF1& fcstab(112) = &H7387& fcstab(113) = &H620E& fcstab(114) = &H5095& fcstab(115) = &H411C& fcstab(116) = &H35A3& fcstab(117) = &H242A& fcstab(118) = &H16B1& fcstab(119) = &H738& fcstab(120) = &HFFCF& fcstab(121) = &HEE46& fcstab(122) = &HDCDD& fcstab(123) = &HCD54& fcstab(124) = &HB9EB& fcstab(125) = &HA862& fcstab(126) = &H9AF9& fcstab(127) = &H8B70& fcstab(128) = &H8408& fcstab(129) = &H9581& fcstab(130) = &HA71A& fcstab(131) = &HB693& fcstab(132) = &HC22C& fcstab(133) = &HD3A5& fcstab(134) = &HE13E& fcstab(135) = &HF0B7& fcstab(136) = &H840& fcstab(137) = &H19C9& fcstab(138) = &H2B52& fcstab(139) = &H3ADB& fcstab(140) = &H4E64& fcstab(141) = &H5FED& fcstab(142) = &H6D76& fcstab(143) = &H7CFF& fcstab(144) = &H9489& fcstab(145) = &H8500& fcstab(146) = &HB79B& fcstab(147) = &HA612& fcstab(148) = &HD2AD& fcstab(149) = &HC324& fcstab(150) = &HF1BF& fcstab(151) = &HE036& fcstab(152) = &H18C1& fcstab(153) = &H948& fcstab(154) = &H3BD3& fcstab(155) = &H2A5A& fcstab(156) = &H5EE5& fcstab(157) = &H4F6C& fcstab(158) = &H7DF7& fcstab(159) = &H6C7E& fcstab(160) = &HA50A& fcstab(161) = &HB483& fcstab(162) = &H8618& fcstab(163) = &H9791& fcstab(164) = &HE32E& fcstab(165) = &HF2A7& fcstab(166) = &HC03C& fcstab(167) = &HD1B5& fcstab(168) = &H2942& fcstab(169) = &H38CB& fcstab(170) = &HA50& fcstab(171) = &H1BD9& fcstab(172) = &H6F66& fcstab(173) = &H7EEF& fcstab(174) = &H4C74& fcstab(175) = &H5DFD& fcstab(176) = &HB58B& fcstab(177) = &HA402& fcstab(178) = &H9699& fcstab(179) = &H8710& fcstab(180) = &HF3AF& fcstab(181) = &HE226& fcstab(182) = &HD0BD& fcstab(183) = &HC134& fcstab(184) = &H39C3& fcstab(185) = &H284A& fcstab(186) = &H1AD1& fcstab(187) = &HB58& fcstab(188) = &H7FE7& fcstab(189) = &H6E6E& fcstab(190) = &H5CF5& fcstab(191) = &H4D7C& fcstab(192) = &HC60C& fcstab(193) = &HD785& fcstab(194) = &HE51E& fcstab(195) = &HF497& fcstab(196) = &H8028& fcstab(197) = &H91A1& fcstab(198) = &HA33A& fcstab(199) = &HB2B3& fcstab(200) = &H4A44& fcstab(201) = &H5BCD& fcstab(202) = &H6956& fcstab(203) = &H78DF& fcstab(204) = &HC60& fcstab(205) = &H1DE9& fcstab(206) = &H2F72& fcstab(207) = &H3EFB& fcstab(208) = &HD68D& fcstab(209) = &HC704& fcstab(210) = &HF59F& fcstab(211) = &HE416& fcstab(212) = &H90A9& fcstab(213) = &H8120& fcstab(214) = &HB3BB& fcstab(215) = &HA232& fcstab(216) = &H5AC5& fcstab(217) = &H4B4C& fcstab(218) = &H79D7& fcstab(219) = &H685E& fcstab(220) = &H1CE1& fcstab(221) = &HD68& fcstab(222) = &H3FF3& fcstab(223) = &H2E7A& fcstab(224) = &HE70E& fcstab(225) = &HF687& fcstab(226) = &HC41C& fcstab(227) = &HD595& fcstab(228) = &HA12A& fcstab(229) = &HB0A3& fcstab(230) = &H8238& fcstab(231) = &H93B1& fcstab(232) = &H6B46& fcstab(233) = &H7ACF& fcstab(234) = &H4854& fcstab(235) = &H59DD& fcstab(236) = &H2D62& fcstab(237) = &H3CEB& fcstab(238) = &HE70& fcstab(239) = &H1FF9& fcstab(240) = &HF78F& fcstab(241) = &HE606& fcstab(242) = &HD49D& fcstab(243) = &HC514& fcstab(244) = &HB1AB& fcstab(245) = &HA022& fcstab(246) = &H92B9& fcstab(247) = &H8330& fcstab(248) = &H7BC7& fcstab(249) = &H6A4E& fcstab(250) = &H58D5& fcstab(251) = &H495C& fcstab(252) = &H3DE3& fcstab(253) = &H2C6A& fcstab(254) = &H1EF1& fcstab(255) = &HF78& End If ' The initial FCS value fcs = pppinitfcs16 ' evaluate the FCS For i = LBound(cp) To LBound(cp) + Size - 1 fcs = (fcs &H100&) Xor fcstab((fcs Xor cp(i)) And &HFF&) Next i ' return the result Crc16 = fcsEnd Function

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