Teensy 4.1 Cannot access Internal SD card

[TomNickell]

That isn't a 'WARNING' to be concerned with - unless the one chosen is WRONG - more of informative feedback - actually added to the Arduino system by Paul@PJRC

Thanks. That is helpful.

[martonfodor]

I'm using PlatformIO 5.1.0 (+Visual Code) with a Teensy 4.1.
As you could probably guess from below, I'm trying to get ArduinoMenu going with SdFat (cards are small FAT16 for a reason) and a rotary encoder.
All libs and platform software are up-to-date.
I'm getting "'BUILTIN_SDCARD' was not declared in this scope"

Where is that symbol actually declared? what's its value on a Teensy 4.1?

Any help is appreciated!

PACKAGES:
- framework-arduinoteensy 1.153.0 (1.53)
- toolchain-gccarmnoneeabi 1.50401.190816 (5.4.1)
Dependency Graph
|-- <MIDI Library> 5.0.2
|-- <USBHost_t36> 0.1
|-- <Encoder>
|-- <Adafruit BusIO> 1.7.1
| |-- <Wire> 1.0
| |-- <SPI> 1.0
|-- <ArduinoMenu library> 4.21.3
| |-- <SdFat> 2.0.4
| | |-- <SPI> 1.0
| |-- <ClickEncoder> 0.0.0-alpha+sha.9337a0c46c
| |-- <Wire> 1.0
| |-- <Adafruit GFX Library> 1.10.5
| | |-- <Adafruit BusIO> 1.7.1
| | | |-- <Wire> 1.0
| | | |-- <SPI> 1.0
| | |-- <Wire> 1.0
| | |-- <SPI> 1.0
|-- <ClickEncoder> 0.0.0-alpha+sha.9337a0c46c
|-- <SdFat> 2.0.4
| |-- <SPI> 1.0
|-- <SPI> 1.0
|-- <Adafruit GFX Library> 1.10.5
| |-- <Adafruit BusIO> 1.7.1
| | |-- <Wire> 1.0
| | |-- <SPI> 1.0
| |-- <Wire> 1.0
| |-- <SPI> 1.0
|-- <Adafruit SSD1306> 2.4.3
| |-- <Adafruit GFX Library> 1.10.5
| | |-- <Adafruit BusIO> 1.7.1
| | | |-- <Wire> 1.0
| | | |-- <SPI> 1.0
| | |-- <Wire> 1.0
| | |-- <SPI> 1.0
| |-- <SPI> 1.0

[martonfodor]

I have the answer to this now, thanks!

[chrissaich]

Hi.

I cannot get the Teensy 4.1 SD card reader to recognise any SD card. I have tried 2 different Teensy 4.1 modules and 8 different sizes and brands of SD card. I've even tried 2 different PC's and USB cables - clutching at straws, I know. I've used the BUILTIN_SDCARD in this and a number of other example programs, but they consistently find 'no card'. The fact that they compile correctly tells me that they are using the correct Teensy SD.h//SDFat.h etc.

The cards all format and read fine on my PC and via a Arduino Mega2560 card reader.

I have an ethernet Magjack wired to both Teensy modules; would this stop it recognising the SD card reader? There are no other peripherals connected.

[Frank B]

Well, something must be wrong, because it works great, normally.
No the magjacks are no problem.

[TomNickell]

Hi.

I cannot get the Teensy 4.1 SD card reader to recognise any SD card. I have tried 2 different Teensy 4.1 modules and 8 different sizes and brands of SD card. I've even tried 2 different PC's and USB cables - clutching at straws, I know. I've used the BUILTIN_SDCARD in this and a number of other example programs, but they consistently find 'no card'. The fact that they compile correctly tells me that they are using the correct Teensy SD.h//SDFat.h etc.

The cards all format and read fine on my PC and via a Arduino Mega2560 card reader.

I have an ethernet Magjack wired to both Teensy modules; would this stop it recognising the SD card reader? There are no other peripherals connected.

Hi, I don't have any particular insight, but I've been using the SD reader for a while now and it does work.

Fairly obvious suggestions:
1.Format the SD cards with the official formatter:
https://www.sdcard.org/downloads/formatter/

2. Post pictures and code here. Usually someone gets back with suggestions pretty quickly.

3. Is it possible you damaged something installing the Magjack? Tiny board, hot iron.

Good luck.

[chrissaich]

Thanks for the replies. I did most of my testing with one SD card which seems to be faulty and when I tried other SD cards, it seems to have been with a program which used the wrong SD.h.
All now working with 7 out of 8 SD cards. The other one works perfectly on PC's but not Teensy.
All good to proceed, thanks for the help.