SD Card on m.iMXRT1176 Eval Board

[Thinbungee]

Does anyone have experience of using the SD Card functions recently on the 1176 eval board or Teensy ? I havent managed to get it to work on either of 2 boards here. The low-level writeblocks and readblocks seem to work OK, but trying to mount the SD card produces an error: OSError: [Errno 19] ENODEV at the mount function:

from machine import SDCard
import vfs
sd = SDCard(1)
fat = vfs.VfsFat(sd)
vfs.mount(fat,"/sd")

I have additionally tested on Teensy 4.1 (Both IMXRT1176 and Teensy are using 1.24.1 )

[robert-hh]

SDcards are supported by the MIMXRT port. I just verified that for MINXRT1176_EVK and Teensy 4.1 . The requirement for the card is:

• Single FAT32 partition.

I just enabled the exFAT partition type and will make a PR for it. There is no good reason for not supporting exFAT. By default it is not enabled in MicroPython to save flash code space, but the MIMXRT devices have plenty of flash code space available.

[Thinbungee]

Hi, Robert I checked the partition type in the SD cards I was testing with and they have a single FAT32 partition. Is my test program above ok ?

SD card is present
(7989100544, 512)
Traceback (most recent call last):
File "", line 19, in
OSError: [Errno 19] ENODEV

The SD card detects OK and the info function produces (7989100544, 512) which appear to be correct. Can you describe how you test this to make it work ?