Cannot save to SD card

OpenMV Boards
1

Hi,

I am trying to save video to the SD card using a H7+, as in the mjpeg example. However, it appears the SD card is not being detected by the camera during startup: the SD card is not visible when mounting the camera in windows, the camera does not run a main.py loaded there manually, and scripts run from the IDE save output to the internal flash. However, the card is visible when running

import pyb
sd=pyb.SDCard()
print(sd.present(), sd.info())

as recommended here, which showed that pyb.SDCard().present() was true. However, using uos.statvfs(‘/’) showed that the root FS had only 8183 x 4096 byte blocks.

I also tried manually mounting, in accordance with the micropython documentation but this failed with errorno ENODEV.

It does not appear to be a hardware issue: the card works fine on my laptop’s own slot, but not in any H7 or HT+ I tried, and the card is a SanDisk Ultra 16GB C10 card (a type tested successfully here). I am using the latest firmware (4.3.0), but had the same problem before updating too, so I suspect the problem is user error somehow. What am I doing wrong?

2

When you connect the card to the camera and then plug the camera into the PC what disk shows up?

Is present just tests a GPIO pin… but, if the card file system cannot be mounted then it will not appear.

3

I see the internal flash when connected via USB.

I can write to the SD card using pyb.SDCard().writeblocks(), and then extract the data from the raw device file on a laptop, which makes me think that the problem is mounting the card, but I’ve tried both exFAT and FAT formats and neither worked

4

Any resolution on this one? seems to be the problem I have as well.