[Fixed]
Took me a while, but with lots of research I figured out what to do. It appears that the autodetect pin is not available for this board at all, and come to think of it, I had to power-cycle the printer every time I switched SDCard as there was no other way to get it recognized, before I even changed the firmware the first time. So now knowing that autodetect is not working anyway, the fix was to find out how to enable "Init SD Card" or something alike as an option on the printer's display (As I want it stand-alone and normally don't have a computer connected to it).
In the file pins_GT2560_REV_A.h , I commented out the following lines
//#define SD_DETECT_PIN 38
//#define SD_DETECT_PIN -1
Also really useful was to enable the M503 command, which can be done in the configuration.h file by commenting out the following line:
//#define DISABLE_M503
So... after a lot of fiddling around, my Geeetech Prusa i3 Pro B is now working with BLTouch and can "refresh" SDCards by software menu without a power-cycle :D Yay!
Took me a while, but with lots of research I figured out what to do. It appears that the autodetect pin is not available for this board at all, and come to think of it, I had to power-cycle the printer every time I switched SDCard as there was no other way to get it recognized, before I even changed the firmware the first time. So now knowing that autodetect is not working anyway, the fix was to find out how to enable "Init SD Card" or something alike as an option on the printer's display (As I want it stand-alone and normally don't have a computer connected to it).
In the file pins_GT2560_REV_A.h , I commented out the following lines
//#define SD_DETECT_PIN 38
//#define SD_DETECT_PIN -1
Also really useful was to enable the M503 command, which can be done in the configuration.h file by commenting out the following line:
//#define DISABLE_M503
So... after a lot of fiddling around, my Geeetech Prusa i3 Pro B is now working with BLTouch and can "refresh" SDCards by software menu without a power-cycle :D Yay!