Write data to flash through fstorage in the bootloader example

[tanjs]

Hi

Use SDK15.3 path .. \ .. \ examples \ dfu \ secure_bootloader \ pca10040_ble \ arm5_no_packs. Using fstorage to write flash data, the function nrf_fstorage_write returns NRF_SUCESS, but when I read the value in flash again, it is not written normally. Is this the reason? I have tried to achieve normal in the APP application, but the bootloader is not normal. Can you help me analyze the reason? Attached below is my code snippet and compressed package.

uint8_t write_boot_flag(void)
{
	ret_code_t err_code;
	uint32_t m_data = 0, x_data = 0;
	
	nrf_fstorage_api_t * p_fs_api;	

	p_fs_api = &nrf_fstorage_sd;

	err_code = nrf_fstorage_init(&fstorage, p_fs_api, NULL);
	APP_ERROR_CHECK(err_code);	

	err_code = nrf_fstorage_erase(&fstorage, 0x3e000, 4, NULL);
	APP_ERROR_CHECK(err_code);
	wait_for_flash_ready(&fstorage);
	
	m_data = 0x52465246;
    err_code = nrf_fstorage_write(&fstorage, 0x3e000, &m_data, sizeof(m_data), NULL);
    APP_ERROR_CHECK(err_code);
    wait_for_flash_ready(&fstorage);
	
    err_code = nrf_fstorage_read(&fstorage, 0x3e000, &x_data, sizeof(x_data));
    APP_ERROR_CHECK(err_code);
    wait_for_flash_ready(&fstorage);	
	
	if(x_data == 0x52465246)
	{
		bsp_board_led_on(BSP_BOARD_LED_2);
	}
	else if(x_data == 0xFFFFFFFF)
	{
		bsp_board_led_on(BSP_BOARD_LED_1);
	}	

	return NRF_SUCCESS;
}

dfu.zip

[Joakim Jakobsen]

Hi.

You will need to wait for the callback. nrf_fstorage_write only schedules the flash operation. (See: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_fstorage.html?cp=7_1_3_57_2#lib_fstorage_write)

if (rc == NRF_SUCCESS)

{

/* The operation was accepted.

Upon completion, the NRF_FSTORAGE_WRITE_RESULT event

is sent to the callback function registered by the instance. */

}

You set the callback function when you initialize fstorage. (See: https://infocenter.nordicsemi.com/topic/sdk_nrf5_v16.0.0/lib_fstorage.html?cp=7_1_3_57_1#lib_fstorage_init)

You can take a look at the Flash Storage Example for more information.

Best regards,
Joakim