Facing errors related to sd card after a time

[Rakshita]

I integrated the sd card code into my main code in which the the wifi module (nrf5340 + nrf7002) receives uart data from a different device 
What I need to do is that whenever the wifi gets disconnected I need to write (save) the data into the sd card and when it will again get reconnected to wifi I need to read the data from the sd card 
I have made a separate function which I have made as thread in which I manage the write and read function as per the wifi connectivity status and data receiving from the different device.

For reference I am attaching my code below

4336.wifi_over_http.zip

Get 
[00:00:39.289,855] <err> sd: Failed to read from SDMMC -116
[00:00:39.289,855] <err> sd: Card read failed
[00:00:39.289,886] <err> fs: file write error (-5)

such kind of errors I get after some time

[Priyanka]

Hi,

Please take a look at this ticket: 

https://devzone.nordicsemi.com/f/nordic-q-a/96568/file-write-gives--5-after-file-size-reaches-cache-size?ReplyFilter=Answers&ReplySortBy=Answers&ReplySortOrder=Descending 

The issue could be due to the size as mentioned in the ticket.

Hope this helps.

Regards,

Priyanka

[Rakshita]

Thanks for your reply
But I am not using flash partition in my overlay file

[Priyanka]

Hi Rakshita,

Could you verify whether your sd card is formatted and working correctly? Maybe verify this by using the sd card in another device. 
This is just because the error SDMMC -116 may suggest a sd card issue or that the sd card is not accessed properly.

-Priyanka

[Rakshita]

Actually what happens is sometimes it works very smoothly and sometimes after working for sometimes it suddenly starts giving this timeout related error and failed to open the file

[00:00:15.659,393] <inf> home_demo: Data is the same as the last written data. Skipping write.
[00:00:15.659,423] <inf> home_demo: cloud value: 2
[00:00:16.659,515] <inf> home_demo: data received: 1
[00:00:16.669,860] <inf> home_demo: Read total 1919 bytes from file /SD:/testfile.txt

[00:00:16.671,752] <inf> home_demo: Data is the same as the last written data. Skipping write.
[00:00:16.671,783] <inf> home_demo: cloud value: 2
[00:00:17.671,844] <inf> home_demo: data received: 1
[00:00:17.682,067] <inf> home_demo: Read total 1919 bytes from file /SD:/testfile.txt

[00:00:17.683,959] <inf> home_demo: Data is the same as the last written data. Skipping write.
[00:00:17.683,990] <inf> home_demo: cloud value: 2
[00:00:18.684,051] <inf> home_demo: data received: 1
[00:00:18.694,213] <inf> home_demo: Read total 1919 bytes from file /SD:/testfile.txt

[00:00:18.696,105] <inf> home_demo: Data is the same as the last written data. Skipping write.
[00:00:18.696,136] <inf> home_demo: cloud value: 2
[00:00:19.696,594] <inf> home_demo: data received: 1
[00:00:21.289,855] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:21.289,855] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:21.289,886] <inf> home_demo: UART_RX_DISABLED
[00:00:31.180,816] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:31.180,847] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:31.180,847] <inf> home_demo: UART_RX_DISABLED
[00:00:41.073,211] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:41.073,242] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:41.073,272] <inf> home_demo: UART_RX_DISABLED
[00:00:42.926,300] <err> sd: Failed to read from SDMMC -5
[00:00:42.926,361] <err> sd: Card read failed
[00:00:42.926,391] <err> fs: file read error (-5)
Error reading from file /SD:/testfile.txt [-5]
[00:00:50.965,911] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:50.965,942] <inf> home_demo: UART_RX_BUF_RELEASED
[00:00:50.965,972] <inf> home_demo: UART_RX_DISABLED
[00:00:54.978,851] <err> sd: Failed to read from SDMMC -5
[00:00:54.978,851] <err> sd: Card read failed
[00:00:54.978,881] <err> fs: file open error (-5)

[Priyanka]

Have you tried using a different sd card, just to rule out the sd card problem?

-Priyanka

[Rakshita]

Yes I had 2 cards tried to use both of them

[Priyanka]

Hi,

Could you check what IO voltages the sd card supports?

The nRF7002DK supports 1.8V on the GPIOs, I guess and maybe the sd card uses 3.3V so this can be a problem.

-Priyanka