[BUG] SD Card not working for RepRapDiscount Smart Controller on Re-ARM RAMPS board

[leonardojc90]

Did you test the latest bugfix-2.1.x code?

Yes, and the problem still exists.

Bug Description

I have replaced my Arduino Mega on a RAMPS setup with a Re-ARM board and re-soldered the EXP1 screen cable as described on this comment on issue #11927, testing continuity on all the wires

The screen works properly after that, and the LCD SD card is even detected, but trying to access its contents or sending a M21 GCode command fails. Switching to the onboard SD card reader (#define SDCARD_CONNECTION ONBOARD) works properly, but it's inconvenient for my printer build (The board stays inside an enclosure)

Bug Timeline

No response

Expected behavior

No response

Actual behavior

No response

Steps to Reproduce

No response

Version of Marlin Firmware

Marlin bugfix-2.1.x

Printer model

No response

Electronics

BOARD_RAMPS_14_RE_ARM_EFB

LCD/Controller

REPRAP_DISCOUNT_SMART_CONTROLLER

Other add-ons

TOUCH_MI_PROBE

Bed Leveling

AUTO_BED_LEVELING_BILINEAR

Your Slicer

None

Host Software

None

Don't forget to include

• A ZIP file containing your Configuration.h and Configuration_adv.h.
  Configuration.zip

Additional information & file uploads

No response

[ellensp]

on the re-arm the sdcard card be in 1 of 2 modes
Host mode where it is visible as a drive under you os and marlin cannot see it
or Marlin mode and the OS cannot see it

(from memory) you use
M21 to switch to marlin mode
M22 to switch to host mode

There should also be an menu item to do this on the lcd

[leonardojc90]

on the re-arm the sdcard card be in 1 of 2 modes Host mode where it is visible as a drive under you os and marlin cannot see it or Marlin mode and the OS cannot see it

(from memory) you use M21 to switch to marlin mode M22 to switch to host mode

There should also be an menu item to do this on the lcd

Is there also a way to switch between onboard and LCD readers via GCode or do I necessarily have to reflash with #define SDCARD_CONNECTION LCD?

[ellensp]

That is a compile time options only. Also two SDCARDs are not supported

[leonardojc90]

M22 command with onboard SD card reader:

M21 command with onboard SD card reader:

M22 command with LCD SD card reader:

M21 command with LCD SD card reader:

[ellensp]

try enabling #define SD_SPI_SPEED SPI_HALF_SPEED in Configuration_adv.h

where the parameter can be any of the following, defaults to SPI_FULL_SPEED with this setting disabled

#define SPI_FULL_SPEED      0   // Set SCK to max rate
#define SPI_HALF_SPEED      1   // Set SCK rate to half of max rate
#define SPI_QUARTER_SPEED   2   // Set SCK rate to quarter of max rate
#define SPI_EIGHTH_SPEED    3   // Set SCK rate to 1/8 of max rate
#define SPI_SIXTEENTH_SPEED 4   // Set SCK rate to 1/16 of max rate
#define SPI_SPEED_5         5   // Set SCK rate to 1/32 of max rate
#define SPI_SPEED_6         6   // Set SCK rate to 1/64 of max rate

[leonardojc90]

Sorry for the late reply

#define SD_SPI_SPEED SPI_HALF_SPEED didn't change things for me

Actually it messed up the screen's text

[ellensp]

for the lcd sdcard are you using a ramps lcd adapter?
If so a left or a right ?

Left

or Right

And are you sure you plugged into exp2 (in this eg it at the bottom, but some have it at the top, should be labeled)
You talk about exp1, but the lcd sdcard is on exp2.

[leonardojc90]

I'm using the adapter, yes

And EXP2 is plugged on the right side

I'll check the cables

[leonardojc90]

I have re-plugged the adapter and tried again with a new and shorter flat cable, without success

Infortunately I don't have other adapter to test with, but this setup was working fine with my Arduino Mega

(The model I have is like the one on the first image, with the cuts facing inward)