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

• Four 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.

• SysConfig is not yet supported for CRC driver

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;
    crcChannel_t    crcChNumber = CRC_CHANNEL_1;
 
    status = CRCChannelReset(gCrcBaseAddr, crcChNumber);
    DebugP_assert(status == SystemP_SUCCESS);
 
    status = CRCInitialize(gCrcBaseAddr, crcChNumber, 0, 0);
    DebugP_assert(status == SystemP_SUCCESS);

CRC Module Configuration Example

    int32_t         status;
    uint32_t        patternCnt, sectCnt, mode;
    crcChannel_t    crcChNumber = CRC_CHANNEL_1;
 
    patternCnt  = 100;      /* Calculate CRC for 100 words */
    sectCnt     = 1;
    mode        = CRC_OPERATION_MODE_FULLCPU;   /* CPU mode */
    status = CRCConfigure(gCrcBaseAddr, crcChNumber, patternCnt, sectCnt, mode);
    DebugP_assert(status == SystemP_SUCCESS);

CRC Operation Example

    int32_t                 status;
    crcSignatureRegAddr_t   psaSignRegAddr;
    crcSignature_t          sectSignVal;
    uint32_t                patternCnt;
    uint32_t                loopCnt, data = 0xAA55AA55;
    crcChannel_t            crcChNumber = CRC_CHANNEL_1;
 
    /* Get CRC PSA signature register address */
    status = CRCGetPSASigRegAddr(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 = CRCGetPSASectorSig(gCrcBaseAddr, crcChNumber, &sectSignVal);
    DebugP_assert(status == SystemP_SUCCESS);

API

APIs for CRC