SD.exists("/") works faulty

[dsyleixa]

edit: the following issue is caused by dedicated ESP SD libs, not by the original Arduino libs (just tested):

SD.exists("/") works faulty!
If the SD has been started correctly by SD.begin(SD_CS) and the SD should be checked if intermediately mistakenly removed, it always shows "OK" and never shows an error:

 #include <SD.h>

void loop() {
   //...
   if( SD.exists("/") ) {
      Serial.println(" SD path '/' OK!  ");  // either if SD inserted or removed !!!
      // debug
      delay(2000);
   }
   else {
      Serial.println( "error! no SD file path found!  "); 
      // debug
      delay(2000);
   }
   //...
}

Arduino IDE 1.8.9
ESP32 board 1.0.4
default settings

PS:
the SD needs to be checked by the root path
SD.exists("/")
because the current files on the SD are unknown, So finally the root path is the only path which is existing on either formatted SD.
OTOH, SD.begin() also always returns no error if the SD is mistakenly not present any more.
Additionally, if no SD was inserted at the start (SD.begin() fails at setup() ), then a later re-inserting during runtime plus an extra SD.begin() also does not restart and reload the SD contents

[dsyleixa]

PS, update, just checked:
on an original Arduino board (Arduino Due) this fault is not happening, the code above works fine as expected.
Appearently the Arduino SD libs are fine.
So the fauly behaviour must be due to ESP SD libs.

[dsyleixa]

@rel1ct: what do you mean by your effing emojies?

[lbernstone]

Your expectations really could use some work. This is a community project- nobody here works for you. If you think the behavior is wrong, work to fix it. Saying "this is broken" is lazy and boorish.
From a posix standpoint, checking whether a mount point exists should always return true. Instead of using the bad workaround that some Duo example used, think about a better way to do this. Checking the size of the filesystem should be more portable and reliable.

[dsyleixa]

I have no idea about driver code or technical failures, I am a simple Arduino user, a hobby programmer (like almost all common arduino users, for whom Arduino/Wiring had been developed),
I have no CS, no technician or programming education, learning just from example sketches.
I reported the bug in the hope that it will be of interest and that it can be fixed by pros and/or experts.
As stated, the original Arduino API functions for SD on an Arduino Due (same SD used for testing) works well though.
Happy new year!

[rel1ct]

Where did you read that the libraries and functionality for ESP32 should be completely identical to Arduino Due or ESP8266?

[dsyleixa]

the way how it's currently working for an "original" Arduino is fine, and the way how it's currently working for ESP32 is faulty - that's the crucial point which I had reported above.

[rel1ct]

What is your understanding of the "original" Arduino ?
Where did you read that the libraries and functionality for ESP32 should be completely identical to Arduino Due or ESP8266 ?

[lbernstone]

@dsyleixa : I will need to get my sd card rigged up so I can fix this. Expect a PR soon.

[dsyleixa]

will there be a fix of the broken SD lib functions
SD.exists("/")
SD.begin()
to actually "really" check or restart anew?

[dsyleixa]

will there soon be some fixes available?

[stale]

[STALE_SET] This issue has been automatically marked as stale because it has not had recent activity. It will be closed in 14 days if no further activity occurs. Thank you for your contributions.

[dsyleixa]

issue is still unresolved

[stale]

[STALE_CLR] This issue has been removed from the stale queue. Please ensure activity to keep it openin the future.