i can not read SD_card,i need your help.
SD.begin(SD_SELECT) allways return false(Parselni.cpp: line 73 )
We know that SD_SELECT in the program is assigned the value of BUILTIN_SDCARD, and we tried to find the definition of BUILTIN_SDCARD. We learned that this value is not defined by the user but is inherent to the Teensy board. We added a print statement and found that BUILTIN_SDCARD is 254, and the CS pin in the SPI setup reads 3.3V instead of 0V. So far, we don't understand why SD.begin(SD_SELECT) returns false. This makes it difficult to proceed with our replication work because we cannot read the SD card's configuration parameters. Are there any solutions?
@huang_enhong Is there an appropriate SD card in the Teensy microcontroller? Please confirm.
@huang_enhong Have you tried another SD card or Teensy? It sounds like there may be a hardware issue.
We tested the hardware with the program 'CardInfo' and found that it can read files normally. Could having multiple environments with the same name affect compilation, and in turn affect SD card reading?
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