How to calculate CRC16 checksum for iButton

[Andre_Pretorius]

i am not sure only one way to find out try and try again

[Darrel Taylor]

Dallas CRC16 Routines (Tom Estes)
https://www.picbasic.co.uk/forum/showthread.php?t=1745

I haven't used the CRC16 routines, but Tom's CRC8 worked great on a project of mine.
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[ashwini kotwal]

Thanks for replying me.
I tried the given code, but I am not able to write it in C#.Net. As I don't know the varaible type of CRC16. Can you please explain me?

[mech962784]

Dear Andre

i need the sample code for implementing modbus slave on a PIC16F877A

please help me

[Andre_Pretorius]

here is the code i used on a 16f627
Hope it helps

[mech962784]

Dear Andre

thank you for the code you have posted,actually i am trying to use the PIC16F877A

another thing i have copy and pasted your code to proton+ compiler and i got some error messages one of them was
for this part of the code:

IF CRC16.Bit0=1 Then '<------ error here is saying Invalid Cast for this type of variable
CRC16=$A001^(CRC16>>1)
Else
CRC16=CRC16>>1
EndIF

i don't know what does that means,please help me.

Best Regards

[Ioannis]

First of all this is PBP forum list not Proton.

Second, as this is PBP, all examples are for this compiler. The syntax is a little different.

The syntax of the line IF CRC16.Bit0=1 Then means: Set bit 0 of the word variable CRC16.

You have to open your manual and find how this can be accomplished in your Compiler.

Ioannis