SDK12.3 flash storage

[Mr.Wu]

I want to store some data into flash. Whether there are relevant application notes or program code? Thanks

[Hung Bui]

Do you use softdevice or not ? If you use softdevice please have a look at this fds usage here.

If you don't use softdevice, please have a look at the SDK example \examples\peripheral\flashwrite

[Mr.Wu]

use softdevice, this test code：link text

static uint8_t fs_callback_flag;

static void fs_evt_handler(fs_evt_t const * const evt, fs_ret_t result)
{
	if (result != FS_SUCCESS)
	{
		bsp_indication_set(BSP_INDICATE_FATAL_ERROR);
	}
	else
	{
		NRF_LOG_INFO("fstorage command successfully completed\n\r");
		fs_callback_flag = 0;
	}
}

static void power_manage(void)
{
	uint32_t err_code = sd_app_evt_wait();

	APP_ERROR_CHECK(err_code);
}

void fstorage_test(void)
{
	static char char_data[5];
	static char special_char_data[5];
	static uint32_t data;
	uint32_t flash_data[4];

	FS_REGISTER_CFG(fs_config_t fs_config) =
	{
		.callback  = fs_evt_handler,
		.num_pages = NUM_PAGES_SN,
		.priority  = 0xFD
	};

	fs_ret_t ret = fs_init();
	if (ret != FS_SUCCESS)
	{
		bsp_indication_set(BSP_INDICATE_FATAL_ERROR);
	}
	
	// Erase one page (page 0).
	NRF_LOG_INFO("Erasing a flash page at address 0x%X\r\n", (uint32_t)fs_config.p_start_addr);
	fs_callback_flag = 1;
	ret = fs_erase(&fs_config, fs_config.p_start_addr, 1, NULL);
	if (ret != FS_SUCCESS)
	{
		bsp_indication_set(BSP_INDICATE_FATAL_ERROR);
	}
	while(fs_callback_flag == 1)  {power_manage();}
	
	//Read the first 4 words of the page
	NRF_LOG_INFO("Reading from flash address 0x%X: ", (uint32_t)fs_config.p_start_addr);
	for(int i=0; i<4; i++)
	{
		flash_data[i] = *(fs_config.p_start_addr + i);
		NRF_LOG_INFO("%X ", flash_data[i]);
	}

	//Write first word
	data = 0x4455AABB;
	NRF_LOG_INFO("Writing data 0x%X to address 0x%X\r\n", data, (uint32_t)fs_config.p_start_addr);
	fs_callback_flag = 1;
	ret = fs_store(&fs_config, fs_config.p_start_addr, &data, 1, NULL);      //Write data to memory address 0x0003F00. Check it with command: nrfjprog --memrd 0x0003F000 --n 16
	if (ret != FS_SUCCESS)
	{
		bsp_indication_set(BSP_INDICATE_FATAL_ERROR);
	}
	while(fs_callback_flag == 1)  {power_manage();}

	//Write second word
	data = 0;
	strcpy(char_data, "buzz");
	char_data[4] = '\0';
	data |= (char_data[0] << 24);
	data |= (char_data[1] << 16);
	data |= (char_data[2] <<  8);
	data |= (char_data[3] <<  0);
	
	NRF_LOG_INFO("Writing string '%s' (0x%X) to address 0x%X\r\n", (uint32_t)char_data, data, (uint32_t)fs_config.p_start_addr + 4);
	
	fs_callback_flag = 1;
	ret = fs_store(&fs_config, fs_config.p_start_addr + 1, &data, 1, NULL);      //Write data to memory address 0x0003F000. Check it with command: nrfjprog --memrd 0x0003F000 --n 16
	if (ret != FS_SUCCESS)
	{
		bsp_indication_set(BSP_INDICATE_FATAL_ERROR);
	}
	while(fs_callback_flag == 1)  {power_manage();}
	
	//Write third word
	data = 0;
	strcpy(special_char_data,"~!@#");
	special_char_data[4] = '\0';
	data |= (special_char_data[0] << 24);
	data |= (special_char_data[1] << 16);
	data |= (special_char_data[2] <<  8);
	data |= (special_char_data[3] <<  0);
	
	NRF_LOG_INFO("Writing string '%s' (0x%X) to address 0x%X\r\n", (uint32_t)special_char_data, data, (uint32_t)fs_config.p_start_addr + 8);
	
	fs_callback_flag = 1;
	ret = fs_store(&fs_config, fs_config.p_start_addr + 2, &data, 1, NULL);      //Write data to memory address 0x0003F000. Check it with command: nrfjprog --memrd 0x0003F000 --n 16
	if (ret != FS_SUCCESS)
	{
		bsp_indication_set(BSP_INDICATE_FATAL_ERROR);
	}
	while(fs_callback_flag == 1)  {power_manage();}
	
	
	//Read the first 4 words of the page and print in hex format
	NRF_LOG_INFO("Reading from flash address 0x%X (hex): ", (uint32_t)fs_config.p_start_addr);
	for(int i=0; i<4; i++)
	{
		flash_data[i] = *(fs_config.p_start_addr + i);
		NRF_LOG_INFO("%X ", flash_data[i]);
	}
	
	//Read the first 4 words of the page and print in ascii format
	NRF_LOG_INFO("Reading from flash address 0x%X (ascii): ", (uint32_t)fs_config.p_start_addr);
	for(int i=0; i<4; i++)
	{
		char characters[4];
		flash_data[i] = *(fs_config.p_start_addr + i);
		characters[0] = flash_data[i] >> 24;
		characters[1] = flash_data[i] >> 16;
		characters[2] = flash_data[i] >>  8;
		characters[3] = flash_data[i] >>  0;
		NRF_LOG_INFO("%c%c%c%c ", characters[0], characters[1], characters[2], characters[3]);
	}
}

Called directly in the main.c， no problem。 If, called in a callback function， the application stops running

[Hung Bui]

Can you check what is the error ? is it hardfault ?

You need to make sure the priority of the interrupt where you call the function is APP_LOW so that you can call flash API. Otherwise you have to use app scheduler to call the flash's functions in main context.