用什么指令解决一下问题error: 服务器不允许请求未公开的对象 4b493591c4c8125c3592d406197b3b0efbe311af 获取了子模组路径 'mavlink/include/mavlink/v2.0'，但是它没有包含 4b493591c4c8125c3592d406197b3b0efbe311af。直接获取该提交失败。

您可以尝试以下指令：

git submodule sync
git submodule update --init --recursive

这些指令会同步您的子模组，并更新您的代码以匹配子模组的最新版本。如果您的子模组中包含了您需要的文件，这些指令将会解决您的问题。

如果您仍然无法解决该问题，您可以尝试在以上指令后添加参数 `--force`，强制更新您的子模组。但请注意，这可能会导致您的代码与子模组不兼容。

相关问题

delphi的crc16源码

Delphi中的CRC16源码用于计算循环冗余校验码（Cyclic Redundancy Check，CRC），是一种常用的差错检测技术。以下是一个简单的Delphi示例代码：

function CRC16(const Data: AnsiString): Word;
const
  CRCTable: array[0..255] of Word = (
    $0000, $1021, $2042, $3063, $4084, $50A5, $60C6, $70E7,
    $8108, $9129, $A14A, $B16B, $C18C, $D1AD, $E1CE, $F1EF,
    $1231, $0210, $3273, $2252, $52B5, $4294, $72F7, $62D6,
    $9339, $8318, $B37B, $A35A, $D3BD, $C39C, $F3FF, $E3DE,
    $2462, $3443, $0420, $1401, $64E6, $74C7, $44A4, $5485,
    $A56A, $B54B, $8528, $9509, $E5EE, $F5CF, $C5AC, $D58D,
    $3653, $2672, $1611, $0630, $76D7, $66F6, $5695, $46B4,
    $B75B, $A77A, $9719, $8738, $F7DF, $E7FE, $D79D, $C7BC,
    $48C4, $58E5, $6886, $78A7, $0840, $1861, $2802, $3823,
    $C9CC, $D9ED, $E98E, $F9AF, $8948, $9969, $A90A, $B92B,
    $5AF5, $4AD4, $7AB7, $6A96, $1A71, $0A50, $3A33, $2A12,
    $DBFD, $CBDC, $FBBF, $EB9E, $9B79, $8B58, $BB3B, $AB1A,
    $6CA6, $7C87, $4CE4, $5CC5, $2C22, $3C03, $0C60, $1C41,
    $EDAE, $FD8F, $CDEC, $DDCD, $AD2A, $BD0B, $8D68, $9D49,
    $7E97, $6EB6, $5ED5, $4EF4, $3E13, $2E32, $1E51, $0E70,
    $FF9F, $EFBE, $DFDD, $CFFC, $BF1B, $AF3A, $9F59, $8F78,
    $9188, $81A9, $B1CA, $A1EB, $D10C, $C12D, $F14E, $E16F,
    $1080, $00A1, $30C2, $20E3, $5004, $4025, $7046, $6067,
    $83B9, $9398, $A3FB, $B3DA, $C33D, $D31C, $E37F, $F35E,
    $02B1, $1290, $22F3, $32D2, $4235, $5214, $6277, $7256,
    $B5EA, $A5CB, $95A8, $8589, $F56E, $E54F, $D52C, $C50D,
    $34E2, $24C3, $14A0, $0481, $7466, $6447, $5424, $4405,
    $A7DB, $B7FA, $8799, $97B8, $E75F, $F77E, $C71D, $D73C,
    $26D3, $36F2, $0691, $16B0, $6657, $7676, $4615, $5634,
    $D94C, $C96D, $F90E, $E92F, $99C8, $89E9, $B98A, $A9AB,
    $5844, $4865, $7806, $6827, $18C0, $08E1, $3882, $28A3,
    $CB7D, $DB5C, $EB3F, $FB1E, $8BF9, $9BD8, $ABBB, $BB9A,
    $4A75, $5A54, $6A37, $7A16, $0AF1, $1AD0, $2AB3, $3A92,
    $FD2E, $ED0F, $DD6C, $CD4D, $BDAA, $AD8B, $9DE8, $8DC9,
    $7C26, $6C07, $5C64, $4C45, $3CA2, $2C83, $1CE0, $0CC1,
    $EF1F, $FF3E, $CF5D, $DF7C, $AF9B, $BFBA, $8FD9, $9FF8,
    $6E17, $7E36, $4E55, $5E74, $2E93, $3EB2, $0ED1, $1EF0
  );
var
  i: Integer;
  CRCHigh: Byte;
begin
  Result := $FFFF;
  
  for i := 1 to Length(Data) do
  begin
    CRCHigh := Result shr 8;
    Result := Word(CRCTable[CRCHigh xor Byte(Data[i])] xor (Result shl 8));
  end;
end;

这段代码声明了一个CRC16函数，它接受一个AnsiString类型的参数Data，并返回一个Word类型的CRC16校验值。函数内部使用了一个256个元素的CRC查找表（CRCTable）来进行CRC计算。通过循环遍历输入数据的每个字节，并根据查找表中的值更新结果。最终得出的结果即为CRC16校验值。

delphi CRC16 CCITT-FALSE

你可以使用以下代码来计算 Delphi 中的 CRC16 CCITT-FALSE 校验值：

function CalcCRC16(const Data: array of Byte; Len: Integer): Word;
const
  Crc16Table: array[0..255] of Word = (
    $0000, $1021, $2042, $3063, $4084, $50A5, $60C6, $70E7, $8108, $9129,
    $A14A, $B16B, $C18C, $D1AD, $E1CE, $F1EF, $1231, $0210, $3273, $2252,
    $52B5, $4294, $72F7, $62D6, $9339, $8318, $B37B, $A35A, $D3BD, $C39C,
    $F3FF, $E3DE, $2462, $3443, $0420, $1401, $64E6, $74C7, $44A4, $5485,
    $A56A, $B54B, $8528, $9509, $E5EE, $F5CF, $C5AC, $D58D, $3653, $2672,
    $1611, $0630, $76D7, $66F6, $5695, $46B4, $B75B, $A77A, $9719, $8738,
    $F7DF, $E7FE, $D79D, $C7BC, $48C4, $58E5, $6886, $78A7, $0840, $1861,
    $2802, $3823, $C9CC, $D9ED, $E98E, $F9AF, $8948, $9969, $A90A, $B92B,
    $5AF5, $4AD4, $7AB7, $6A96, $1A71, $0A50, $3A33, $2A12, $DBFD, $CBDC,
    $FBBF, $EB9E, $9B79, $8B58, $BB3B, $AB1A, $6CA6, $7C87, $4CE4, $5CC5,
    $2C22, $3C03, $0C60, $1C41, $EDAE, $FD8F, $CDEC, $DDCD, $AD2A, $BD0B,
    $8D68, $9D49, $7E97, $6EB6, $5ED5, $4EF4, $3E13, $2E32, $1E51, $0E70,
    $FF9F, $EFBE, $DFDD, $CFFC, $BF1B, $AF3A, $9F59, $8F78, $9188, $81A9,
    $B1CA, $A1EB, $D10C, $C12D, $F14E, $E16F, $1080, $00A1, $30C2, $20E3,
    $5004, $4025, $7046, $6067, $83B9, $9398, $A3FB, $B3DA, $C33D, $D31C,
    $E37F, $F35E, $02B1, $1290, $22F3, $32D2, $4235, $5214, $6277, $7256,
    $B5EA, $A5CB, $95A8, $8589, $F56E, $E54F, $D52C, $C50D, $34E2, $24C3,
    $14A0, $0481, $7466, $6447, $5424, $4405, $A7DB, $B7FA, $8799, $97B8,
    $E75F, $F77E, $C71D, $D73C, $26D3, $36F2, $0691, $16B0, $6657, $7676,
    $4615, $5634, $D94C, $C96D, $F90E, $E92F, $99C8, $89E9, $B98A, $A9AB,
    $5844, $4865, $7806, $6827, $18C0, $08E1, $3882, $28A3, $CB7D, $DB5C,
    $EB3F, $FB1E, $8BF9, $9BD8, $ABBB, $BB9A, $4A75, $5A54, $6A37, $7A16,
    $0AF1, $1AD0, $2AB3, $3A92, $FD2E, $ED0F, $DD6C, $CD4D, $BDAA, $AD8B,
    $9DE8, $8DC9, $7C26, $6C07, $5C64, $4C45, $3CA2, $2C83, $1CE0, $0CC1,
    $EF1F, $FF3E, $CF5D, $DF7C, $AF9B, $BFBA, $8FD9, $9FF8, $6E17, $7E36,
    $4E55, $5E74, $2E93, $3EB2, $0ED1, $1EF0);
var
  I: Integer;
  Crc: Word;
begin
  Crc := $FFFF;

  for I := 0 to Len - 1 do
  begin
    Crc := (Crc shr 8) xor Crc16Table[(Crc xor Data[I]) and $FF];
  end;

  Result := Crc;
end;

你可以将需要计算 CRC 校验值的字节数组和字节数组的长度作为参数传入该函数，函数会返回计算出的 CRC16 校验值。