Arduino SD library

PropBoard
#6

Check if you are closing the file before removing the SD. Files may not be updated if you don’t. This is a normal behavior (and one of the potential problems I mentioned in another thread a while ago). Or if you keep the file open, you have to flush the file with File::flush() after a write, or you can open the file with the O_SYNC flag to flush every write automatically to the SD.

What about the \AppData\Local\Arduino15\packages\artekit\hardware\stm32f4\1.0.1\libraries\SD\examples\ReadWrite\ example?

#7

Yes I’m using that example.
it reads nothing from the file, both if the file already exists or has to be created (and it’s not)

#8

So you are seeing the following at the serial port, excluding the last line (testing 1, 2, 3)?

Initializing SD card...initialization done.
Writing to test.txt...done.
test.txt:
testing 1, 2, 3.

If so, it is very strange. I would say to try with another SD card.

#9

I’ve tried this:
to retrieve the number od bytes written by the print function

Serial.println("Writing to test.txt...");
num = myFile.println("testing 1, 2, 3.");
Serial.println(num);
// close the file:
myFile.close();
Serial.println("done.");

and I get always zero bytes written

Initializing SD card...initialization done.
Writing to test.txt...
0
done.
test.txt:
#10

that’s my model.

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#11

ok, is the SD card model.
I used the SD of a saber sound card and it works. (it’s a SanDisk 4GB class 4 )

By the way, which one are you using @Ivan ?

#12

A bunch of them (around 10 different models/brands). I don’t have precisely the one you posted (I have a 64GB kingston). I am about to order a couple of those.

#13

ok so I’m quite unlucky :joy:

#14

I tried to test as much brands/models as I can. Still have to try with some problematic Sandisk.

#15

If you can, please post a list of the working ones, so we have a reference.

#16

For reference, this is the working SanDisk 4GB Class 4.

#17

Thank you.

We should receive these days 2 different models/brands (the ones beta testers have reported problems).

I should put a list of tested SDs in a separate thread or in the documentation. There is also a new improved SD handling code in queue for version 1.0.2.

#18

Hi @Mangaman.

We’ve ordered 8GB SD card from two different places and we received 16GB instead! Could it be that they are going out of production? How long do you have this SD?

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By the way, these SD work without problems.

#19

Hi @Ivan, i got it from Amazon, bought last year.

#20

got one today from Amazon.

Here is the link:
https://www.amazon.it/gp/product/B001CQT0X4/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

#21

Ok. We’ll try with that vendor.

#22

Have also these two.
I will try them asap.

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#23

@Mangaman please try also this with the SD that is not working for you.

Thank you.

#24

Hi @Ivan,
with the new routines it works. Thanks.

What did you change? some timings in the write process?

#25

Mostly initialization code and pin settings.