search

greiman / SdFat-beta

Beta SdFat for test of new features
MIT License
167 stars 61 forks source link

SD.open() is valid after removing SD card #13

Closed gert3d closed 7 years ago

gert3d commented 7 years ago

In a datalogger sketch I use the line myFile = SD.open( fileSD, FILE_WRITE ) to test whether a write can be done. After a couple of successful (checked) writes, I removed the SDcard and to my surprise the test: < if (myxFile) > remains true. If I re-insert the SDcard no more data will be added, although the test remains to be true. I am using this SD Card module: goo.gl/q0AeM2 Even the test < if (SD.exists(fileSD)) > remains true if the card is removed after successful write cycles Same result for the SD.h library

gert3d commented 7 years ago

It is probably due to hardware in Arduino UNO clone, since ProMini behaves differently: after removing the card an error is reported for opening FILE_WRITE. However upon re-inserting the card the error remains. Resetting helps. Is that normal?

greiman commented 7 years ago

Yes, you can't remove and insert the card. Data is cached so an open may appear to work.