82 lines
2.3 KiB
C
82 lines
2.3 KiB
C
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/***************************************************************************
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*
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* Copyright 2015-2019 BES.
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* All rights reserved. All unpublished rights reserved.
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*
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* No part of this work may be used or reproduced in any form or by any
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* means, or stored in a database or retrieval system, without prior written
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* permission of BES.
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*
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* Use of this work is governed by a license granted by BES.
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* This work contains confidential and proprietary information of
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* BES. which is protected by copyright, trade secret,
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* trademark and other intellectual property rights.
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*
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****************************************************************************/
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#include "string.h"
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#include "retention_ram.h"
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#include "hal_timer.h"
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#include "hal_trace.h"
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#define OTA_RANDOM_BLE_BD_ADDR_MAGIC_CODE 0x51544F55
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#define BLE_BD_ADDR_LEN 6
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typedef struct
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{
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uint32_t magicCode; // 0x51544F55: "UOTA" means the OTA firmware should use the BD address
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// in this structure, otherwise it will generate a random BD address
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uint8_t bleBdAddr[BLE_BD_ADDR_LEN];
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} BLE_BD_ADDR_FOR_OTA_T;
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// retained across the HW reset
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BLE_BD_ADDR_FOR_OTA_T __attribute((section(".reboot_param"))) bleBdAddrForOta;
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void fillBleBdAddrForOta(uint8_t* bdAddr)
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{
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bleBdAddrForOta.magicCode = OTA_RANDOM_BLE_BD_ADDR_MAGIC_CODE;
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memcpy(&(bleBdAddrForOta.bleBdAddr), bdAddr, BLE_BD_ADDR_LEN);
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}
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extern uint8_t ble_addr[BLE_BD_ADDR_LEN];
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static unsigned int seed = 1;
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static void set_rand_seed(unsigned int init)
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{
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seed = init;
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}
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static int get_rand(void)
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{
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//Based on Knuth "The Art of Computer Programming"
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seed = seed * 1103515245 + 12345;
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return ( (unsigned int) (seed / 65536) % (32767+1) );
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}
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void otaConfigureBleBdAddr(void)
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{
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if (OTA_RANDOM_BLE_BD_ADDR_MAGIC_CODE == bleBdAddrForOta.magicCode)
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{
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// use the BD address saved in bleBdAddrForOta
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memcpy(&ble_addr, &(bleBdAddrForOta.bleBdAddr), BLE_BD_ADDR_LEN);
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// clear the magic code
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bleBdAddrForOta.magicCode = 0;
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}
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else
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{
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// generate the random BD static address
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int randomData;
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for (uint32_t index = 0;index < BLE_BD_ADDR_LEN/2;index++)
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{
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set_rand_seed(hal_sys_timer_get());
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randomData = get_rand();
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TRACE(2,"randomData %d is 0x%x", index, randomData);
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memcpy(&(ble_addr[index*2]), (uint8_t *)&randomData, 2);
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}
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// top two bits of the random static BD address are 1
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ble_addr[5] |= 0xC0;
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}
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}
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