pinebuds/utils/retention_ram/retention_ram.c

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2022-08-15 04:20:27 -05:00
/***************************************************************************
*
* Copyright 2015-2019 BES.
* All rights reserved. All unpublished rights reserved.
*
* No part of this work may be used or reproduced in any form or by any
* means, or stored in a database or retrieval system, without prior written
* permission of BES.
*
* Use of this work is governed by a license granted by BES.
* This work contains confidential and proprietary information of
* BES. which is protected by copyright, trade secret,
* trademark and other intellectual property rights.
*
****************************************************************************/
#include "string.h"
#include "retention_ram.h"
#include "hal_timer.h"
#include "hal_trace.h"
#define OTA_RANDOM_BLE_BD_ADDR_MAGIC_CODE 0x51544F55
#define BLE_BD_ADDR_LEN 6
typedef struct
{
uint32_t magicCode; // 0x51544F55: "UOTA" means the OTA firmware should use the BD address
// in this structure, otherwise it will generate a random BD address
uint8_t bleBdAddr[BLE_BD_ADDR_LEN];
} BLE_BD_ADDR_FOR_OTA_T;
// retained across the HW reset
BLE_BD_ADDR_FOR_OTA_T __attribute((section(".reboot_param"))) bleBdAddrForOta;
void fillBleBdAddrForOta(uint8_t* bdAddr)
{
bleBdAddrForOta.magicCode = OTA_RANDOM_BLE_BD_ADDR_MAGIC_CODE;
memcpy(&(bleBdAddrForOta.bleBdAddr), bdAddr, BLE_BD_ADDR_LEN);
}
extern uint8_t ble_addr[BLE_BD_ADDR_LEN];
static unsigned int seed = 1;
static void set_rand_seed(unsigned int init)
{
seed = init;
}
static int get_rand(void)
{
//Based on Knuth "The Art of Computer Programming"
seed = seed * 1103515245 + 12345;
return ( (unsigned int) (seed / 65536) % (32767+1) );
}
void otaConfigureBleBdAddr(void)
{
if (OTA_RANDOM_BLE_BD_ADDR_MAGIC_CODE == bleBdAddrForOta.magicCode)
{
// use the BD address saved in bleBdAddrForOta
memcpy(&ble_addr, &(bleBdAddrForOta.bleBdAddr), BLE_BD_ADDR_LEN);
// clear the magic code
bleBdAddrForOta.magicCode = 0;
}
else
{
// generate the random BD static address
int randomData;
for (uint32_t index = 0;index < BLE_BD_ADDR_LEN/2;index++)
{
set_rand_seed(hal_sys_timer_get());
randomData = get_rand();
TRACE(2,"randomData %d is 0x%x", index, randomData);
memcpy(&(ble_addr[index*2]), (uint8_t *)&randomData, 2);
}
// top two bits of the random static BD address are 1
ble_addr[5] |= 0xC0;
}
}