CC3200: CRC16-CCITT(Kermit) calculation

Koichiro Tashiro

Part Number: CC3200

Hi,

I have a customer who wants to calculate CRC16-CCITT on CC32xx.
According to TRM, the CRC module supports this forms, but it seems there are a few variations.

I checked below website to calculate some values.
https://www.lammertbies.nl/comm/info/crc-calculation.html

When I used crc example code in SDK, the results were the same as CRC-CCITT(0xFFFF) results with above calculator.
But what customer wants to get is the value corresponds to CRC-CCITT(Kermit) in the calculator.

Is this supported by the CRC module in CC32xx?

Thanks and regards,
KoT

over 7 years ago

0 Austin Tanner over 7 years ago

TI__Expert 8255 points

Hi KoT,

Please refer to the built-in security features application note. Inside you'll see the second generation device contains a CRC module supporting CRC-16-CCITT

0 Hnz over 7 years ago

Guru 39650 points

Hi KoT,

According description for CRC module at CC3200 it looks that Kermit should have this configuration:
CRC_CFG_INIT_0 | CRC_CFG_TYPE_P1021 |CRC_CFG_IBR|CRC_CFG_OBR |CRC_CFG_SIZE_32BIT

... but I am not 100% sure, because I not tested it (parameters Post Process Reverse/Inverse and Input Bit Reverse can be wrong).

Setup for Kemit: http://reveng.sourceforge.net/crc-catalogue/16.htm#crc.cat.kermit

Related topic (as I know CRC peripheral in TM4C is same as CC3200): https://e2e.ti.com/support/microcontrollers/tiva_arm/f/908/t/313573

Jan

0 Koichiro Tashiro over 7 years ago in reply to Hnz

TI__Mastermind 22935 points

Hi Jan,

Thanks. It works for me!

Thanks and regards,

KoT

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CC3200: CRC16-CCITT(Kermit) calculation