RE: Dynamic Flash Write

AP1 — Thu, 08 Aug 2024 05:38:47 GMT

Hi we are using GPREGRET registers instead of flash write it is working fine

RE: Dynamic Flash Write

Vidar Berg — Wed, 10 Jul 2024 08:44:28 GMT

Please print the event type and error code from your callback so we can see which operation failed and what the error code is.

RE: Dynamic Flash Write

AP1 — Tue, 09 Jul 2024 17:05:34 GMT

Hi i have the following code in nrf52840 sdk 17.1.0 and i have added flash write in the central uart code but i am facing error and unable to write in flash

ret = 0
ret1 = 0
ret2 = 0
data = 0x1
<info> app: --> Event received: ERROR while executing an fstorage operation.
<info> app: --> Event received: ERROR while executing an fstorage operation.

static void fstorage_evt_handler(nrf_fstorage_evt_t * p_evt)
{
if (p_evt->result != NRF_SUCCESS)
{
NRF_LOG_INFO("--> Event received: ERROR while executing an fstorage operation.");
return;
}

switch (p_evt->id)
{
case NRF_FSTORAGE_EVT_WRITE_RESULT:
{
NRF_LOG_INFO("--> Event received: wrote %d bytes at address 0x%x.",
p_evt->len, p_evt->addr);
} break;

case NRF_FSTORAGE_EVT_ERASE_RESULT:
{
NRF_LOG_INFO("--> Event received: erased %d page from address 0x%x.",
p_evt->len, p_evt->addr);
} break;

default:
break;
}

}

NRF_FSTORAGE_DEF(nrf_fstorage_t fstorage) =
{
/* Set a handler for fstorage events. */
.evt_handler = fstorage_evt_handler,
.start_addr = 0x3E000,
.end_addr = 0x3E000+0x1000,
};

uint8_t flash_wrt()
{
ret_code_t ret = nrf_fstorage_erase(&fstorage, 0x3e000, 1, NULL);

printf("ret = %d\n",ret);

wait_for_flash_ready(&fstorage);

ret_code_t ret1 = nrf_fstorage_write(&fstorage, 0x3e000, &data_wrt, sizeof(data_wrt), NULL);
printf("ret1 = %d\n",ret1);

wait_for_flash_ready(&fstorage);

ret_code_t ret2 = nrf_fstorage_read(&fstorage, 0x3e000, &data_rd,sizeof(data_rd));
printf("ret2 = %d\n",ret2);

wait_for_flash_ready(&fstorage);

printf("data = 0x%0X\n",data_rd);

data_rd =0;

return 0;
}

RE: Dynamic Flash Write

Vidar Berg — Mon, 08 Jul 2024 15:43:00 GMT

Hello,

A flash write can only flip bits from '1' to '0'. When erasing a flash page, all zeroes are reset to '1'. Therefore, it is necessary to erase the flash before updating existing data. To minimize the number of page erases and simplify data updates, I recommend using Flash Data Storage (FDS) on top of fstorage.

Best regards,

Vidar