/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

#include <inttypes.h>
#include <string.h>

#include <hal/hal_bsp.h>

#include "nrf51.h"

#ifndef min
#define min(a, b) ((a)<(b)?(a):(b))
#endif

int
hal_bsp_hw_id_len(void)
{
    return sizeof(NRF_FICR->DEVICEID) + sizeof(NRF_FICR->DEVICEADDR);
}

/*
 * These values are generated at random.
 * DEVICEID[0-1] and DEVICEADDR[0-1].
 */
int
hal_bsp_hw_id(uint8_t *id, int max_len)
{
    int len, cnt;

    cnt = min(sizeof(NRF_FICR->DEVICEID), max_len);
    memcpy(id, (void *)NRF_FICR->DEVICEID, cnt);
    len = cnt;

    cnt = min(sizeof(NRF_FICR->DEVICEADDR), max_len - len);
    memcpy(id + len, (void *)NRF_FICR->DEVICEADDR, cnt);

    return len + cnt;
}