Hey Guys,

I have a Mendel with ATMega1280 and pololu-electronics (I soldered the boards myself on stripboard - the firmware is an older marlin release that is configured to work like with RAMPS 1.1 but i changed all pin assignments to fit my electronics).
Everything worked fine for years but now I would like to attach a SDRAMPS and since the SDRAMPS-related Pins are already in use for my axis, I tried to use different pins for SDRAMPS.

But even though I changed the pin assignment, my X-Axis blocks as soon as I activate sdsupport… any suggestions?

Following my Pin-Assignment (Works flawlessly without SDSUPPORT turned on…):

#define X_STEP_PIN         51
#define X_DIR_PIN          53
#define X_ENABLE_PIN       49
#define X_MIN_PIN          47
#define X_MAX_PIN          -1   //2

#define Y_STEP_PIN         43
#define Y_DIR_PIN          45
#define Y_ENABLE_PIN       41
#define Y_MIN_PIN          39
#define Y_MAX_PIN          -1    //17

#define Z_STEP_PIN         42
#define Z_DIR_PIN          44
#define Z_ENABLE_PIN       40
#define Z_MIN_PIN          38
#define Z_MAX_PIN          -1    //19

#define E0_STEP_PIN         48
#define E0_DIR_PIN          50
#define E0_ENABLE_PIN       46

this is what i changed in the file «fastio.h»

#if defined (__AVR_ATmega1280__) || defined (__AVR_ATmega2560__)
// UART
#define	RXD			DIO0
#define	TXD			DIO1

// SPI
#define	SCK			DIO32	//was 52
#define	MISO			DIO34	//was 50
#define	MOSI			DIO33	//was 51
#define	SS			DIO31	//was 53

I also changed the assignment of the above mentioned pins for SCK, MISO, MOSI and SS in «pins.h» and in «Sd2PinMap.h» with no result… any ideas?

THANKS for your help!

AFAIK, you can´t change the pins for SPI. They are fixed in the processor.
You´ll have to rewire the driver pins and reassign them to freely available digital pins.
-Olaf

Ugh....

I see... thanx for mentioning!
Will rewire then..