CRC

Table of Contents

• Features Supported
• SysConfig Features
• Features NOT Supported
• Important Usage Guidelines
• Example Usage
• API

CRC (Cyclic Redundancy Check) driver provide API to perform CRC operation

Features Supported

• Two channels
• 8, 16, 32 and 64 bit data size
• CPU mode of operations

SysConfig Features

Note

It is strongly recommend to use SysConfig where it is available instead of using direct SW API calls. This will help simplify the SW application and also catch common mistakes early in the development cycle.

• CRC instances selection

Features NOT Supported

• DMA mode of operation

Important Usage Guidelines

• None

Example Usage

Include the below file to access the APIs

#include <drivers/crc.h>

CRC Module Initialization Example

    int32_t         status;
    CRC_Channel_t   crcChNumber = CRC_CHANNEL_1;
 
    status = CRC_channelReset(gCrcBaseAddr, crcChNumber);
    DebugP_assert(status == SystemP_SUCCESS);
 
    status = CRC_initialize(gCrcBaseAddr, crcChNumber, 0, 0);
    DebugP_assert(status == SystemP_SUCCESS);

CRC Module Configuration Example

    int32_t         status;
    CRC_Config     config;
    CRC_Channel_t    crcChNumber = CRC_CHANNEL_1;
 
    config.mode         = CRC_OPERATION_MODE_FULLCPU;
    config.type         = CRC_TYPE_16BIT;
    config.dataLen      = CRC_DATALENGTH_16BIT;
    config.bitSwap      = CRC_BITSWAP_MSB;
    config.byteSwap     = CRC_BYTESWAP_ENABLE;
    config.patternCount = 100;
    config.sectorCount  = 1;
    status = CRC_configure(gCrcBaseAddr, crcChNumber, &config);
    DebugP_assert(status == SystemP_SUCCESS);

CRC Operation Example

    int32_t                 status;
    CRC_SignatureRegAddr   psaSignRegAddr;
    CRC_Signature           sectSignVal;
    uint32_t                patternCnt;
    uint32_t                loopCnt, data = 0xAA55AA55;
    CRC_Channel_t            crcChNumber = CRC_CHANNEL_1;
 
    /* Get CRC PSA signature register address */
    status = CRC_getPSASigRegAddr(gCrcBaseAddr, crcChNumber, &psaSignRegAddr);
    DebugP_assert(status == SystemP_SUCCESS);
 
    /* Perform CRC operation - write data to PSA signature register */
    patternCnt  = 100;      /* Calculate CRC for 100 words */
    for(loopCnt = 0; loopCnt < patternCnt; loopCnt++)
    {
        HW_WR_REG32(psaSignRegAddr.regL, data);     /* 32-bit mode */
    }
 
    /* Get the calculated CRC signature value */
    status = CRC_getPSASectorSig(gCrcBaseAddr, crcChNumber, &sectSignVal);
    DebugP_assert(status == SystemP_SUCCESS);

API

APIs for CRC