uint2hex

void UIntToHexStr(unsigned int uiValue, char cStr[]){

    unsigned int uiNibble;
    unsigned char ucNibbleCounter;

    cStr[0] = '0';
    cStr[1] = 'x';
    for(ucNibbleCounter = 0; ucNibbleCounter < 4; ucNibbleCounter++){
        uiNibble = ((uiValue >> (4 * ucNibbleCounter)) & 0xF);
        if(uiNibble < 10){
            cStr[5 - ucNibbleCounter] = uiNibble + '0';
        }
        else{
            cStr[5 - ucNibbleCounter] = uiNibble + 'A' - 10;
        }
    }
    cStr[6] = NULL;
}

enum Result eHexStringToUInt(char cStr[], unsigned int *puiValue){

    unsigned char ucLoopCounter;
    char cStrElement;

    *puiValue = 0;
    if((cStr[0] != '0') || (cStr[1] != 'x') || (cStr[2] == NULL)){
        return ERROR;
    }
    for(ucLoopCounter = 2; *(cStr + ucLoopCounter) != NULL; ucLoopCounter++){
        cStrElement = cStr[ucLoopCounter];
        if (ucLoopCounter > 5){
            return ERROR;
        }
        else if(cStrElement >= '0' && cStrElement <= '9'){
            *puiValue = (*puiValue << 4) + cStrElement - 48;
        }
        else if(cStrElement >= 'A' && cStrElement <= 'F'){
            *puiValue = (*puiValue << 4) + cStrElement - 55;
        }
        else{
            return ERROR;
        }
    }
    return OK;
}