can not mount SDCard, it is hanging

[mindforger]

if i try to mount an SDCard on my ESP8285 i can start up the SDCard interface but not mount the sd card itself

running ESP8266 Firmware (Compatible, but i had to reformat the interfal FS and make a new clean boot.py to get webrepl working, also there is a /lib in sys.path, i created the /lib folder with os.mkdir, is that okay?)

import os, sdcard, machine sd = sdcard.SDCard(machine.SPI(1), machine.Pin(16)) os.mount(sd, '/sd')

but it simply gets stuck at this last line

after ctrl+C it tells me it is hanging in the loop that is scanning for the first 0xfe

i always get back 0xff and the loop around line 177 is stuck forever

SDCard is connected to the appropriate pins, if i had any wiring issue, the first call would fail with an error (tested multiple times)

is there anything i can do to evaluate my SDcard is working without mounting it?

PS the SDCard worked on an real ESP8266 before and it was FAT32 if i remember correct

is there a way like vfsfat.mkvfs for sd instead of bdev to format the SD properly?

Funny thing thoug ... some rndomly selected (presumably a raspbian flashed) SD card worked just fine ... the SD card might have a bad format, but i can read it through windows ... VERY strange

[mindforger]

Okay, so i maybe found the issue

when the SD Card is too big (8GB) the mounting will hang up, maybe either add an sanity check on the card propertys before trying to seek infinite loops or add an overrun check to this loop around line 177 and fail gracefully

[dpgeorge]

also there is a /lib in sys.path, i created the /lib folder with os.mkdir, is that okay?

Yes that's ok. Also ok to not have /lib.

is there anything i can do to evaluate my SDcard is working without mounting it?

Yes you can try reading (and writing if you don't care about its contents) blocks. Eg:

buf = bytearray(512)
sd.readblocks(0, buf)
print(buf)

and buf should look like the first sector, with 0x55aa at the end.

PS the SDCard worked on an real ESP8266 before and it was FAT32 if i remember correct ... Okay, so i maybe found the issue when the SD Card is too big (8GB) the mounting will hang up

So, did you come to a conclusion as to the cause: is it a combination of ESP8285 and 8GB SD card that is problematic, or just 8GB on any device?

[mindforger]

i tested 2 different 8gb cards, both won't work until i reduce the card size, i did not test the limit but somewhere between 2 and 4 gb it fails.. Maybe the same 3.2gb issue like win32? Maybe something loops infinite when doing the search around line 177

[dpgeorge]

I tried a 4GB card with the sdcard.py driveron a PYBLITEv1.0 and it works OK. The card is formatted to have 32768 bytes per sector and 120320 total sectors, giving a byte-size of 3942645760 bytes.

[mindforger]

i got a long weekend planned, so i can not test it until next week, will try to get another SDCard and test different sizes until then

[mindforger]

just had an idea, but i don't have te actual knowledge on how to do or even how complicated it would be, but how about having a script to format an attached SD card? I mean there is already a builtin command to do so on the bedev, how can i format an attached SD properly using this route?

(PS: i hate ma smartphone, either i activate auto correction to corret typos and such but replacing it with something else i did not mean to say or deactivate and have a shitload of typos in it)

[matikij]

I had a similar issue, noticed that SDCard.readblocks() also hangs, sometimes, also sometimes the buffer had different contents after readblocks(). The PR above fixes both for me.

[mindforger]

buggers, i don't have a setup to compile it myself, will it be released soon?

Currently using a 32GByte designated for another use, but i want to use those i bought especially for this project

[matikij]

@mindforger I don't think you need to compile it to test it out, perhaps you could try copyting the module from https://github.com/matikij/micropython/raw/fix-sdcard/drivers/sdcard/sdcard.py directly to '/ or '/lib' of board (possibly under another name) and then import and test this out. As I don't really have that much cards to test this change it would be cool to know if it helps you as well.

[mindforger]

oh wait i am stupid, i forgot this is already pyscript

[dpgeorge]

Closing, it should be fixed by the above PR.