crc_ex1_buildSignature.c

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 * Copyright (c) 2017, Texas Instruments Incorporated
 * All rights reserved.
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 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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//******************************************************************************
//******************************************************************************
#include "driverlib.h"
 
void main (void)
{
    uint16_t crcSeed = 0xBEEF;
    uint16_t data[] = {0x0123,
                           0x4567,
                           0x8910,
                           0x1112,
                           0x1314};
    uint16_t crcResult;
    uint8_t i;
 
    //Stop WDT
    WDT_A_hold(WDT_A_BASE);
 
    //Set P1.0 as an output
    GPIO_setAsOutputPin(
        GPIO_PORT_P1,
        GPIO_PIN0);
 
    /*
     * Disable the GPIO power-on default high-impedance mode to activate
     * previously configured port settings
     */
    PMM_unlockLPM5();
 
    //Set the CRC seed
    CRC_setSeed(CRC_BASE,
        crcSeed);
 
    for (i = 0; i < 5; i++)
    {
        //Add all of the values into the CRC signature
        CRC_set16BitData(CRC_BASE,
            data[i]);
    }
 
    //Save the current CRC signature checksum to be compared for later
    crcResult = CRC_getResult(CRC_BASE);
 
 
    //*** Test the CRC ***//
 
    //Reset the CRC Signature and set the same seed
    CRC_setSeed(CRC_BASE,
        crcSeed);
 
    for (i = 0; i < 5; i++)
    {
        //Add all of the values into the CRC signature
        CRC_set16BitData(CRC_BASE,
            data[i]);
    }
 
    //Compare the 2 CRC Resulting Signature Checksums
    if (crcResult == CRC_getResult(CRC_BASE)){
        //set P1.0
        GPIO_setOutputHighOnPin(
            GPIO_PORT_P1,
            GPIO_PIN0);
    }
 
    //Enter LPM4, interrupts enabled
    __bis_SR_register(LPM4_bits);
    __no_operation();
}