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51片上flash的問題 |
| 作者：xwj 欄目：單片機(jī) |
關(guān)鍵還是看你怎么寫 |
| 2樓： | >>參與討論 |
| 作者： hunao 于 2006/6/10 0:57:00 發(fā)布：
先搞個HEX2BIN 再看看大小 |
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| 3樓： | >>參與討論 |
| 作者： paulsimons 于 2006/6/10 9:24:00 發(fā)布：
具體怎么理解？ hex和bin的大小有區(qū)別么？ |
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| 4樓： | >>參與討論 |
| 作者： computer00 于 2006/6/10 11:19:00 發(fā)布：
建議看看hex文件的存儲格式。 一個字節(jié)的數(shù)據(jù)，用文本來表示時，至少需要兩字節(jié)，另外再加上地址以及其他信息，所以HEX文件是二進(jìn)制文件大小的兩倍還多。 QUESTION What is the INTEL.html">INTEL HEX file format? ANSWER The INTEL.html">INTEL HEX file is an ASCII text file with LINEs of text that follow the INTEL.html">INTEL HEX file format. Each LINE in an INTEL.html">INTEL HEX file contains one HEX record. These records are made up of hexadecimal NUMBERs that represent machine language code and/or constant data. INTEL.html">INTEL HEX files are often used to transfer the program and data that would be stored in a ROM or EPROM. Most EPROM programmers or emulators can use INTEL.html">INTEL HEX files. Record Format An INTEL.html">INTEL HEX file is composed of any NUMBER of HEX records. Each record is made up of five fields that are arranged in the following format: :llAAAAtt[dd...]cc Each GROUP of letters corresponds to a different field, and each letter represents a SINGLE hexadecimal digit. Each field is composed of at least two hexadecimal digits-which make up a byte-as described below: : is the colon that starts every INTEL.html">INTEL HEX record. ll is the record-length field that represents the NUMBER of data bytes (dd) in the record. AAAA is the address field that represents the starting address for subsequent data in the record. tt is the field that represents the HEX record type, which may be one of the following: 00 - data record 01 - end-of-file record 02 - extended segment address record 04 - extended LINEar address record dd is a data field that represents one byte of data. A record may have multiple data bytes. The NUMBER of data bytes in the record must match the NUMBER specified by the ll field. cc is the CHECKSUM field that represents the CHECKSUM of the record. The CHECKSUM is calculated by summing the VALUEs of all hexadecimal digit pairs in the record modulo 256 and taking the two's complement. Data Records The INTEL.html">INTEL HEX file is made up of any NUMBER of data records that are terminated with a carriage return and a LINEfeed. Data records appear as follows: :10246200464C5549442050524F46494C4500464C33 where: 10 is the NUMBER of data bytes in the record. 2462 is the address where the data are to be located in MEMORY. 00 is the record type 00 (a data record). 464C...464C is the data. 33 is the CHECKSUM of the record. Extended LINEAR Address Records (HEX386) Extended LINEar address records are also known as 32-bit address records and HEX386 records. These records contain the upper 16 bits (bits 16-31) of the data address. The extended LINEar address record always has two data bytes and appears as follows: :02000004FFFFFC where: 02 is the NUMBER of data bytes in the record. 0000 is the address field. For the extended LINEar address record, this field is always 0000. 04 is the record type 04 (an extended LINEar address record). FFFF is the upper 16 bits of the address. FC is the CHECKSUM of the record and is calculated as 01h + NOT(02h + 00h + 00h + 04h + FFh + FFh). When an extended LINEar address record is read, the extended LINEar address stored in the data field is saved and is applied to subsequent records read from the INTEL.html">INTEL HEX file. The LINEar address remains effective until changed by another extended address record. The absolute-MEMORY address of a data record is obtained by adding the address field in the record to the shifted address data from the extended LINEar address record. The following example illustrates this PROCESS.. Address from the data record's address field 2462 Extended LINEar address record data field FFFF -------- Absolute-MEMORY address FFFF2462 Extended Segment Address Records (HEX86) Extended segment address records-also known as HEX86 records-contain bits 4-19 of the data address segment. The extended segment address record always has two data bytes and appears as follows: :020000021200EA where: 02 is the NUMBER of data bytes in the record. 0000 is the address field. For the extended segment address record, this field is always 0000. 02 is the record type 02 (an extended segment address record). 1200 is the segment of the address. EA is the CHECKSUM of the record and is calculated as 01h + NOT(02h + 00h + 00h + 02h + 12h + 00h). When an extended segment address record is read, the extended segment address stored in the data field is saved and is applied to subsequent records read from the INTEL.html">INTEL HEX file. The segment address remains effective until changed by another extended address record. The absolute-MEMORY address of a data record is obtained by adding the address field in the record to the shifted-address data from the extended segment address record. The following example illustrates this PROCESS. Address from the data record's address field 2462 Extended segment address record data field 1200 -------- Absolute MEMORY address 00014462 End-of-File (EOF) Records An INTEL.html">INTEL HEX file must end with an end-of-file (EOF) record. This record must have the VALUE 01 in the record type field. An EOF record always appears as follows: :00000001FF where: 00 is the NUMBER of data bytes in the record. 0000 is the address where the data are to be located in MEMORY. The address in end-of-file records is meaningless and is ignored. An address of 0000h is typical. 01 is the record type 01 (an end-of-file record). FF is the CHECKSUM of the record and is calculated as 01h + NOT(00h + 00h + 00h + 01h). Example INTEL.html">INTEL HEX File Following is an example of a complete INTEL.html">INTEL HEX file: :10001300AC12AD13AE10AF1112002F8E0E8F0F2244 :10000300E50B250DF509E50A350CF5081200132259 :03000000020023D8 :0C002300787FE4F6D8FD7581130200031D :10002F00EFF88DF0A4FFEDC5F0CEA42EFEEC88F016 :04003F00A42EFE22CB :00000001FF Hex文件的INTEL格式:這是INTEL.html">INTEL公司提出的按地址排列的數(shù)據(jù)信息,數(shù)據(jù)寬度為字節(jié),所有數(shù) 據(jù)使用16進(jìn)制數(shù)字表示. 這是一個例子: :10008000AF5F67F0602703E0322CFA92007780C361 :1000900089001C6B7EA7CA9200FE10D2AA00477D81 :0B00A00080FA92006F3600C3A00076CB :00000001FF 第一行,":"符號表明記錄的開始. 后面的兩個字符表明記錄的長度,這里是10h. 后面的四個字 符給出調(diào)入的地址,這里是0080h. 后面的兩個字符表明記錄的類型; 0 數(shù)據(jù)記錄 1 記錄文件結(jié)束 2 擴(kuò)展段地址記錄 3 開始段地址記錄 4 擴(kuò)展線性地址記錄 5 開始線性地址記錄 后面則是真正的數(shù)據(jù)記錄, 最后兩位是校驗(yàn)和檢查,它加上前面所有的數(shù)據(jù)和為0. 最后一行特殊,總是寫成這個樣子. 擴(kuò)展INTEL.html">INTEL Hex的格式(最大1M): 由于普通的INTEL.html">INTEL的Hex記錄文件只能記錄64K的地址范圍, 所以大于64K的地址數(shù)據(jù)要靠擴(kuò)展INTEL.html">INTEL Hex格式的文件來記錄.對于擴(kuò)展形式Hex文件,在每 一個64K段的開始加上擴(kuò)展的段地址規(guī)定,下面的數(shù)據(jù)地址均在這個段內(nèi),除非出現(xiàn)新的段地址 定義. 一個段地址 定義的格式如下: 起始符 長度 起始地址 擴(kuò)展段標(biāo)示 擴(kuò)展段序號 無用 累加和 : 02 0000 02 3000 EC 段地址的標(biāo)識符是第四組數(shù)據(jù)02,表示擴(kuò)展地址段的定義,再后面的以為HEX數(shù)表示段 |
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| 5樓： | >>參與討論 |
| 作者： mcuatmel 于 2006/6/10 11:51:00 發(fā)布：
不要看文件大小 要看Keil編譯時下面提示的Code段的大小，這才是你的真正要寫到片子中的代碼長度。 |
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