25 minutes ago, Eric Ellison said:

Nice info Mr Troy, but if I may offer some advice the windows Calculator has a Programmer mode that easily takes the last four of Big-Endian HEX checksum(highlight all bytes except the first two of .bin file) and if you go to Bitwise menu, you use NOT function and add 1 and there’s your new checksum

 

Cool stuff. Thanks 

I tested it and not working for me. I have the same calib file like you, change the same byte  (09 from a5 to a4) and write the same checksum to file - dps stop at 0% with error 😞

The way I find the easiest is to set the first two bytes in the file to FF FF, calculate the big-endian 16-bit, take the last 4, i.e. 2F B5, use the Hex Calculator to do FFFF - 2FB5, giving us a result of D0 4A. Fill the first two byte with that checksum and bam, it's correct.

Hex Calculator

WWW.CALCULATOR.NET

---

This free hex calculator can add, subtract, multiply, and divide hexadecimal values, as well as convert between hexadecimal and decimal values.

 

On 6/2/2022 at 12:26 AM, MNP said:

The way I find the easiest is to set the first two bytes in the file to FF FF, calculate the big-endian 16-bit, take the last 4, i.e. 2F B5, use the Hex Calculator to do FFFF - 2FB5, giving us a result of D0 4A. Fill the first two byte with that checksum and bam, it's correct.

Hex Calculator

WWW.CALCULATOR.NET

---

This free hex calculator can add, subtract, multiply, and divide hexadecimal values, as well as convert between hexadecimal and decimal values.

 

After trying guide by Troy i just stubbled upon this comment - as yes its way easier doing the way you wrote ! Thanks

good day to you troy.

what type of software you are using to modify the calibration files?

3 hours ago, mr fixing said:

good day to you troy.

what type of software you are using to modify the calibration files?

 

A hex editor 

 

im getting error using the same file as @Troy 23402917 changin the same byte... in DPS any idea? 23402917CORR

ProgramLog_hmi.Txt

Спасибо Трой 

On 10/27/2022 at 2:31 AM, Arbe_gtc said:

im getting error using the same file as @Troy 23402917 changin the same byte... in DPS any idea? 23402917CORR

ProgramLog_hmi.Txt 5.54 kB · 12 downloads

If it is not too late, try this one

23402917CORR_CS.bin

22 hours ago, _mrv_ said:

If it is not too late, try this one

23402917CORR_CS.bin 441 B · 3 downloads

I already resolved it. some calibrations are calculated in little-endian, and others in bigg-endian (the HMI uses little)

 

thanks!!

How to apply this to Global Can B?

On 3/16/2023 at 12:22 PM, Arbe_gtc said:

I already resolved it. some calibrations are calculated in little-endian, and others in bigg-endian (the HMI uses little)

 

thanks!!

Care to share exactly what you did? I'm going to try and write an app to automate it.

1 hour ago, Vauxhall_Mark said:

Care to share exactly what you did? I'm going to try and write an app to automate it.

Open somes calibrations file of different units (BCM, IPC, HMI...) with hex editor neo. And use the checksum option, select "all document" to check the checksum of all the file and calculate Little-endian 16 and Big-endian 16. then you have results. (i dont know if there are more ecus with oter type of checksum. probably no)

If you look the result of the checksum, you can see 0000 or FFFF in 16 big, or 16 little. Only in one of them. then with this you can know if is little 16 or big 16.

You careful with this: If the result of checksum is FFFF you  dont need add nothing to correct checksum. if the result is 0000, you need add +1 to the result and in some cases, the result of the checksum must swap (i see this in K74 HMI and K26 AFL module K26 in astra K uses both types of checksum big-end 16 in some files, and little-end 16 in other.)

I cant tried all units, but check the type of checksum uses is easy.

the method for calculate the correction, we know it 😛

1 hour ago, Arbe_gtc said:

Open somes calibrations file of different units (BCM, IPC, HMI...) with hex editor neo. And use the checksum option, select "all document" to check the checksum of all the file and calculate Little-endian 16 and Big-endian 16. then you have results. (i dont know if there are more ecus with oter type of checksum. probably no)

If you look the result of the checksum, you can see 0000 or FFFF in 16 big, or 16 little. Only in one of them. then with this you can know if is little 16 or big 16.

You careful with this: If the result of checksum is FFFF you  dont need add nothing to correct checksum. if the result is 0000, you need add +1 to the result and in some cases, the result of the checksum must swap (i see this in K74 HMI and K26 AFL module K26 in astra K uses both types of checksum big-end 16 in some files, and little-end 16 in other.)

I cant tried all units, but check the type of checksum uses is easy.

the method for calculate the correction, we know it 😛

My basic excel macro calculates checksum from the endian result, that's first stage but saves a little time. 

On 10/20/2023 at 6:05 PM, Arbe_gtc said:

Open somes calibrations file of different units (BCM, IPC, HMI...) with hex editor neo. And use the checksum option, select "all document" to check the checksum of all the file and calculate Little-endian 16 and Big-endian 16. then you have results. (i dont know if there are more ecus with oter type of checksum. probably no)

If you look the result of the checksum, you can see 0000 or FFFF in 16 big, or 16 little. Only in one of them. then with this you can know if is little 16 or big 16.

You careful with this: If the result of checksum is FFFF you  dont need add nothing to correct checksum. if the result is 0000, you need add +1 to the result and in some cases, the result of the checksum must swap (i see this in K74 HMI and K26 AFL module K26 in astra K uses both types of checksum big-end 16 in some files, and little-end 16 in other.)

I cant tried all units, but check the type of checksum uses is easy.

the method for calculate the correction, we know it 😛

Got it basically working can edit any value and re-checksum.  Been testing with my HMI, enabled a few options to test Climate App, Touchpad, front camera etc. @codebuilder not as polished as yours but only a proof of concept, I'll code it up properly in visual studio when I get a chance. 

3 minutes ago, Vauxhall_Mark said:

Got it basically working can edit any value and re-checksum.  Been testing with my HMI, enabled a few options to test Climate App, Touchpad, front camera etc. @codebuilder not as polished as yours but only a proof of concept, I'll code it up properly in visual studio when I get a chance. 

Hey, it does the job!!! haha, nice work :).  At least you've made a quick way to do it.

On 22.10.2023 at 00:08, codebuilder said:

Эй, это делает свою работу!!! хаха, хорошая работа :). По крайней мере, вы нашли быстрый способ сделать это.

Hello, can you give me your WhatsApp or write to me?

10 minutes ago, KiT71 said:

Hello, can you give me your WhatsApp or write to me?

Regarding? 

3 minutes ago, Vauxhall_Mark said:

Касательно? 

I want to buy a program for recalculating checksums

2 minutes ago, KiT71 said:

I want to buy a program for recalculating checksums

It's not really something that's ready, it basically works but just something I knocked up in a couple hours. Currently only testing on HMI files but managed to get all the options I wanted working. 

 

I can enable something on an HMI file for you if that helps? 

6 hours ago, KiT71 said:

I want to buy a program for recalculating checksums

Are you hoping to modify lots of calibrations?  Not all types of modules work the same for checksums.  I've already had to figure out quite a few.

3 minutes ago, codebuilder said:

Are you hoping to modify lots of calibrations?  Not all types of modules work the same for checksums.  I've already had to figure out quite a few.

More of a proof I can do it really, I've added menus/code to calculate little and big endian. 

 

What other methods are you aware of? 

6 minutes ago, codebuilder said:

Вы надеетесь изменить множество калибровок? Не все типы модулей одинаково работают с контрольными суммами. Мне уже пришлось разобраться со многими.

Yes, I would like to buy something to change the calibrations in the dashboard and more often in the comfort unit, can you give me your WhatsApp and discuss everything there?

Hello Troy,

Hope you are doing well.

I am going to calculate the checksum of the GM BCM EPROM, I have followed the instructions outlined in this article but to no avail. Please help me to calculate the checksum of EPROM is the same steps or not. 

for more information, I have not edited the EPROM and calculated the checksum to compare the original result but result of checksum is different.

toza eprom bcm.bin

9 minutes ago, Rustam Abdullayev said:

Hello Troy,

Hope you are doing well.

I am going to calculate the checksum of the GM BCM EPROM, I have followed the instructions outlined in this article but to no avail. Please help me to calculate the checksum of EPROM is the same steps or not. 

for more information, I have not edited the EPROM and calculated the checksum to compare the original result but result of checksum is different.

toza eprom bcm.bin 4 kB · 0 downloads

the chekcsum corrections applies to modules calibrations, no to the BCM (or other units) eeprom