Problem while using SPI4 and UART1 together in nrf5340

[ShuMan]

Hi,

I am using nrf connect sdk V2.0.0 and nrf5340 DK.

Using fat_fs and uart examples, I managed to get the SD card and UART work individually. For SD card, I am using SPI4 and for UART, I am using UART1.

However, when I tried to combine fat_fs into UART example, I am unable to initialise them together.

Thanks

[Einarh]

Hello

However, when I tried to combine fat_fs into UART example, I am unable to initialise them together.

What exactly do you mean by "unable"?

Can you share any error messages or logs etc giving any info on why/how it fails?

Best regards,

Einar

[ShuMan]

Hi Einarh,

Below is the attached zip file with combined prj.conf and nrf5340dk_nrf5340_cpuapp.overlay files. Previously, I have referred fat_fs and UART examples.

prj_overlay.zip

If CONFIG_DISK_DRIVER_SDMMC=y & CONFIG_SPI=y lines are not commented then UART communication fails over UART and nrf5340 keeps on restarting.

If CONFIG_DISK_DRIVER_SDMMC=y & CONFIG_SPI=y lines are commented then UART communication works over UART1 but SD card initialization fails (as SDMMC and SPI are not configured).

Thanks

[Einarh]

Have you tested the fat_fs sample with your overlay file, or only with the default configuration?

I'm suspecting you might need a storage_dev pointer in your fs_mount_t struct when you're using a custom config. Are you doing this?

-Einar

[ShuMan]

I am attaching the fat_fs sample with my overlay file. The example is working for me and I am able to read and write to the SD card.

fat_fs_spi4.zip

-Shubham

[Einarh]

When UART communication fails and the device keeps restarting, do you get any error messages in the log?

Have you tried scoping the pins?