STM32N6570-DK | VENC_SDCard_ThreadX | Using exFAT

[dksmith]

I have been modifying the VENC_SDCard_ThreadX example to read in raw data through pipe0 with success. However, my bottleneck appears to be the SD card write speed; I understand that this example was designed to write compressed h.264 files - and it looks like it only writes at around 320 kB/s.

Since I am capturing much more data, I would like to use exFAT instead of FAT32, and write to a UHS I card at max speed (SDR104). I defined FX_ENABLE_EXFAT within fx_user.h, but it I am still unable to write to an exFAT formatted card.

fx_media_open() passes just fine, but upon inspection it appears that the available clusters always is 0. Am I missing any steps? Any insight would be appreciated.

[Saket_Om]

Hello @dksmith 

Could you share you code please, then we can assist you more effectively. 

[dksmith]

Hello,

To test writing to exFAT I have just been running the unmodified VENC_SDCard_ThreadX example code. I made sure FX_ENABLE_EXFAT was defined in fx_user.h. This was my only edit. 

[dksmith]

I have also attempted to use fx_media_exFAT_format() to format the card for exFAT upon initialization, but no change. It seems like the cluster size always starts at 1 and then becomes zero.