NRF52832---FLASH存储用户数据（掉电保存）
硬件使用：NRF52832QFAAB0，FLASH 512K RAM 64KB
协议栈：S132 4.0.2
SDK: nRF5 SDK v13.0.0
参考资源：
（1）http://blog.csdn.net/zxzkyking1/article/details/72845355
（2）http://infocenter.nordicsemi.com/index.jsp中Experimental: Flash Storage
交流qq: 1732700158可以一起讨论52832相关开发的点点滴滴。
1.问题：实际项目中有很多时候，需要存储用户的设置信息，比如广播名称的修改，发射功率的修改，广播间隔的修改，密码修改，是否已经与设备绑定。这时候就需要用到FLASH来存储用户数据，达到掉电也保存配置数据。这里用Nrf52832用FLASH配合协议栈来实现最基本的用户数据的存储，擦除，读取。
2.关键点：存储的地址是初始化时候自动分配的。还有就是擦除读取，在主程序中进行，不要放到各种回调函数中进行，比如nus在收到擦除的命令，给一个标志，在主程序中进行擦除动作。
typedef struct
{
/**@brief The beginning of the flash space assigned to the application which registered this
* configuration. This field is set by @ref fs_init. It can also be set manually.
*/
uint32_t const * p_start_addr;
/**@brief The end of the flash space assigned to the application which registered this
* configuration. This field is set by @ref fs_init. It can also be set manually.
*/
uint32_t const * p_end_addr;
fs_cb_t const callback; //!< Callback to run when a flash operation has completed.
uint8_t const num_pages; //!< The number of flash pages requested.
/**@brief The priority with which fstorage should assign flash pages to this application,
* with respect to other applications. Applications with higher priority will be
* assigned flash pages with a higher memory address. The highest priority is
* reserved. Must be unique among configurations.
*/
uint8_t const priority;
} fs_config_t;
3.步骤：
static uint8_t fs_callback_flag;
注册使用：
FS_REGISTER_CFG(fs_config_t fs_config) =
{
.callback = fs_evt_handler, // Function for event callbacks.
.num_pages = NUM_PAGES, // Number of physical flash pages required.
.priority = 0xFE // Priority for flash usage.
};
回调函数：
static void fs_evt_handler(fs_evt_t const * const evt, fs_ret_t result)
{
if (result != FS_SUCCESS)
{
// An error occurred.
}
else
{
fs_callback_flag=0;
}
}
void user_info_save_init(void)
{
fs_ret_t ret = fs_init();
if (ret != FS_SUCCESS)
{
// An error occurred.
}
}
// Retrieve the address of a page.
static uint32_t const * address_of_page(uint16_t page_num)
{
return fs_config.p_start_addr + (page_num * PAGE_SIZE_WORDS);
}
void user_info_erase(void)
{
fs_ret_t ret;
fs_callback_flag= 1;
ret = fs_erase(&fs_config, address_of_page(0), 1,NULL);
if (ret != FS_SUCCESS)
{
NRF_LOG_INFO("%d\r\n",ret);
}
while(fs_callback_flag== 1)
{
power_manage();
}
}
void user_info_store(void)
{
fs_ret_t ret;
fs_callback_flag= 1;
ret = fs_store(&fs_config, fs_config.p_start_addr, (uint32_t*)&app_status, sizeof(app_status),NULL);
if (ret != FS_SUCCESS)
{
// An error occurred.
}
while(fs_callback_flag== 1)
{
power_manage();
}
}
void user_info_read(void)//only invoke once when powen on
{
//memcpy(&test_app_status,fs_config.p_start_addr,sizeof(app_status));
memcpy(&app_status,fs_config.p_start_addr,sizeof(app_status));
if((app_status.BondStatus ==0xFF)||(app_status.BeepStatus=0))
{
memset(&app_status,0,sizeof(app_status));
}
}
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