1.36.4 Cyclic Redundancy Check Calculation Unit (CRCCU)

Using The Library

CRC calculation for a memory range is started after writing the start address into the Address register and the size of the memory range into the Length register. Both must be word aligned.

The initial seed value used for the CRC calculation must be written to the Data register. This value will usually be 0xFFFFFFFF, but can be, for example, the result of a previous CRC calculation if generating a common CRC of separate memory blocks.

Once completed, the calculated CRC value can be read out of the Data register. The read value must be complemented to match standard CRC implementations or kept non-inverted if used as starting point for subsequent CRC calculations.

Here is an example code to calculate a CRC-32 value

const uint8_t crc_data[16] = {0xf0, 0x7f, 0x00, 0x20, 0x19,0x0c,
0x00, 0x00, 0x39, 0x0e, 0x00, 0x00, 0x3b, 0x0e, 0x00, 0x00}

uint32_t crc = 0;

CRCCU_Initialize();

if (CRCCU_CRCCalculate((uint32_t)&crc_data, 16, &crc, false) == true)
{
    //application specific code
}

Library Interface

Cyclic Redundancy Check Calculation Unit peripheral library provides the following interfaces:

Functions

Data types and constants