TMS320F280025: Regarding the invocation of "CRC_run16BitPoly1Reflected" for CRC verification in SCI communication

Christopher Parker

Assuming that CRC verification needs to be performed on the data "01 03 0002 0001" in SCI communication. Actually, I need to input "0301 0200 0100" to VCRC and call "CRC_bitReflect" to change the output value to obtain the parity value that meets CRC16-MODBUS. I have tried modifying "CRC.parity", but there is no effect on the high and low bytes, and in SCI data reception, we commonly use Uint16 variables to receive LinbRegs.SCIRD.all. What needs to be done to quickly obtain the desired CRC parity value?

over 2 years ago

0 Christopher Parker over 2 years ago

Prodigy 50 points

F28003x supports the "CRC_bitReflect" function. How can I use the "CRC_bitReflect" function in the F280025?

0 Sira Rao80 over 2 years ago in reply to Christopher Parker

TI__Mastermind 27985 points

Both the F28003x and F28002x contain the same VCRC, so the method of use would be the same.

0 Christopher Parker over 2 years ago in reply to Sira Rao80

Prodigy 50 points

Assuming we receive data {0x01, 0x02, 0x03, 0x04} on SCI, and the actual data we receive is stored as {0x0001, 0x0002, 0x0003, 0x0004}. However, before performing CRC verification, we need to "bundle" this data into {0x0201, 0x0403}. Is there a way to directly input {0x0001, 0x0002, 0x0003, 0x0004} and obtain the CRC16-MODBUS checksum value?

0 Sira Rao80 over 2 years ago in reply to Christopher Parker

TI__Mastermind 27985 points

Some pre-processing has to be done, without which this is not possible.

Please see my last reply in this post

https://e2e.ti.com/support/microcontrollers/c2000-microcontrollers-group/c2000/f/c2000-microcontrollers-forum/1169664/launchxl-f28379d-vcu2-crc32-not-calculating-as-expected/4415779#4415779

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TMS320F280025: Regarding the invocation of "CRC_run16BitPoly1Reflected" for CRC verification in SCI communication