I know the crc should be 0A, but I have been unable to produce this value. I was looking over the CRC subvi's in the Data_validating_functions. Evaluating And Selecting Efl Teaching Materials Pdf Merge. llb. I understand that the for loop sets the current bit to zero and XOR the remainder to zero, but I am confused as to what the array outside the for loop is doing. I don't understand why I am indexing this array with my data array.

I am using the 'U8' string to byte array to feed my values into the CRC-8 subvi. The polynomial expression I need to use is: x^8 + x^4 + x^3+ x^2 + 1. Hi, Thanks for the vi.

The program is supposed to send a string of hex commands to a OBDII port on a automobile. The CRC has to be used because that is how GM checks the commands sent a received by the ECU. I read through web page provide, and added some code to divide by the polynominal and came up with the smae value as tbd's vi. The vi worked for one of the commands, but not for the rest. I was unable to open the 'Perfom CRC on 1D data array' vi becuase I am using LV 8.0. I don't understand what is wrong, the math appears to be correct. Here is the updated vi, and a list of commands including the correct CRC values.

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Thanks, Adam. HI Adam, I've attached an image of the VI I sent previously for you to have a look. I think all you'll need to do is to change the 0f01 value used in the program with the value for your polynomial. The algorithm I used to develop this VI is as follows: Begin crc = 0 for each byte (in the data) do crc=crc XOR data_byte for i=1 to 8 do crc_lsb = lsb of crc (lsb = Least significant bit) crc=crc shifted right by 1 bit with zero msb if crc_lsb = 1 crc=crc XOR 0x0f01 end if end for end for End Regards, Andy.