how to read hex file

[dagakshay]

hello 

one interesting thing which might solve your doubt if you are looking for the hex code size of your project.

where you saw the size of your hex file?… just by right clicking on the file and going to the properties? is that the way you have checked?…

you are 100% wrong if you have assumed that is the original amount of hex which is going to be dumped in your controller.

open your hex file with a text editor like notepad.. it should look something like this:

//……………………………………………………………

:100000000C942A000C9434000C9434000C943400AA

:100010000C9434000C9434000C9434000C94340090

:100020000C9434000C9434000C9434000C94340080

:100030000C9434000C9434000C9434000C94340070

:100040000C9434000C9434000C9434000C94340060

:100050000C94340011241FBECFE5D4E0DEBFCDBF29

:100060000E9436000C946E000C940000FF920F93D7

:100070001F938FEF87BB81BB8EEFF82E04E02AEF32

:1000800030E01DEFBAE0ABEF41E1F7EFEFE17FEEDB

:100090006FED5FEBF8BA02BBC9010197F1F718BB2E

:1000A000B2BBC9010197F1F7A8BB42BBC9010197D7

:1000B000F1F7F8BBE2BBC9010197F1F778BB42BB8E

:1000C000C9010197F1F768BB42BBC9010197F1F77C

:1000D00058BB42BBC9010197F1F7DCCFF894FFCFC1

:00000001FF

//………………………………………………………………

 

let me take one line from this hex file

:100000000C942A000C9434000C9434000C943400AA

:CCAAAATTXXXXX……XXSS

1) A new line in hex file always starts from “:” (colon)

2) The first two letters represent the number of bytes in that line (all the values written in hex)…”CC”

3) The AAAA: the next four letters indicate from where this line should start… the starting address…

4) type of the line.. if TT=00 more lines are there in that hex file,,, if TT=01 that is the last line in that hex file…

5) XXXX……..XX is the original code that is going to be dumped onto your controller..

6) at last the SS is the checksum for the complete line.

if you want the original size of your hex code you are going to dump, go to the second last line note the address and add the count bytes (CC) this will tell the original size…

the size you see in the properties of file is the size of that text file which includes all the : , CC , AAAA and SS which you are not goin to dump in your controller ……..

 

post your comments here if you have any doubts in that or you can add on more information here

[Amit Joshi]

can u explain it by giving example.

[Ahmed]

If we can see example about this it will be great for us to calculate our HEX file.

Thanks dagakshay

[nikhiljain]

Hello,

 

Try this

 

http://www.engineersgarage.com/tutorials/what-is-hex-file-format

[nikhiljain]

Hello,

 

Try this

 

http://www.engineersgarage.com/tutorials/what-is-hex-file-format

[ravi kant]

do you have more or can u can recommend book about hex file?pls reply

[AJISH ALFRED]

Really useful information. Thanks Dagakshay.

[Author]

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